all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
blob 9f327df28f5e0b120216a057548063c37b17b4b0 199851 bytes (raw)
name: lisp/minibuffer.el 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
 
;;; minibuffer.el --- Minibuffer completion functions -*- lexical-binding: t -*-

;; Copyright (C) 2008-2021 Free Software Foundation, Inc.

;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
;; Package: emacs

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; Names with "--" are for functions and variables that are meant to be for
;; internal use only.

;; Functional completion tables have an extended calling conventions:
;; The `action' can be (additionally to nil, t, and lambda) of the form
;; - (boundaries . SUFFIX) in which case it should return
;;   (boundaries START . END).  See `completion-boundaries'.
;;   Any other return value should be ignored (so we ignore values returned
;;   from completion tables that don't know about this new `action' form).
;; - `metadata' in which case it should return (metadata . ALIST) where
;;   ALIST is the metadata of this table.  See `completion-metadata'.
;;   Any other return value should be ignored (so we ignore values returned
;;   from completion tables that don't know about this new `action' form).

;;; Bugs:

;; - completion-all-sorted-completions lists all the completions, whereas
;;   it should only lists the ones that `try-completion' would consider.
;;   E.g.  it should honor completion-ignored-extensions.
;; - choose-completion can't automatically figure out the boundaries
;;   corresponding to the displayed completions because we only
;;   provide the start info but not the end info in
;;   completion-base-position.
;; - C-x C-f ~/*/sr ? should not list "~/./src".
;; - minibuffer-force-complete completes ~/src/emacs/t<!>/lisp/minibuffer.el
;;   to ~/src/emacs/trunk/ and throws away lisp/minibuffer.el.

;;; Todo:

;; - Make *Completions* readable even if some of the completion
;;   entries have LF chars or spaces in them (including at
;;   beginning/end) or are very long.
;; - for M-x, cycle-sort commands that have no key binding first.
;; - Make things like icomplete-mode or lightning-completion work with
;;   completion-in-region-mode.
;; - extend `metadata':
;;   - indicate how to turn all-completion's output into
;;     try-completion's output: e.g. completion-ignored-extensions.
;;     maybe that could be merged with the "quote" operation.
;;   - indicate that `all-completions' doesn't do prefix-completion
;;     but just returns some list that relates in some other way to
;;     the provided string (as is the case in filecache.el), in which
;;     case partial-completion (for example) doesn't make any sense
;;     and neither does the completions-first-difference highlight.
;;   - indicate how to display the completions in *Completions* (turn
;;     \n into something else, add special boundaries between
;;     completions).  E.g. when completing from the kill-ring.

;; - case-sensitivity currently confuses two issues:
;;   - whether or not a particular completion table should be case-sensitive
;;     (i.e. whether strings that differ only by case are semantically
;;     equivalent)
;;   - whether the user wants completion to pay attention to case.
;;   e.g. we may want to make it possible for the user to say "first try
;;   completion case-sensitively, and if that fails, try to ignore case".
;;   Maybe the trick is that we should distinguish completion-ignore-case in
;;   try/all-completions (obey user's preference) from its use in
;;   test-completion (obey the underlying object's semantics).

;; - add support for ** to pcm.
;; - Add vc-file-name-completion-table to read-file-name-internal.

;;; Code:

(eval-when-compile (require 'cl-lib))

;;; Completion table manipulation

;; New completion-table operation.
(defun completion-boundaries (string collection pred suffix)
  "Return the boundaries of text on which COLLECTION will operate.
STRING is the string on which completion will be performed.
SUFFIX is the string after point.
If COLLECTION is a function, it is called with 3 arguments: STRING,
PRED, and a cons cell of the form (boundaries . SUFFIX).

The result is of the form (START . END) where START is the position
in STRING of the beginning of the completion field and END is the position
in SUFFIX of the end of the completion field.
E.g. for simple completion tables, the result is always (0 . (length SUFFIX))
and for file names the result is the positions delimited by
the closest directory separators."
  (let ((boundaries (if (functionp collection)
                        (funcall collection string pred
                                 (cons 'boundaries suffix)))))
    (if (not (eq (car-safe boundaries) 'boundaries))
        (setq boundaries nil))
    (cons (or (cadr boundaries) 0)
          (or (cddr boundaries) (length suffix)))))

(defun completion-metadata (string table pred)
  "Return the metadata of elements to complete at the end of STRING.
This metadata is an alist.  Currently understood keys are:
- `category': the kind of objects returned by `all-completions'.
   Used by `completion-category-overrides'.
- `annotation-function': function to add annotations in *Completions*.
   Takes one argument (STRING), which is a possible completion and
   returns a string to append to STRING.
- `affixation-function': function to prepend/append a prefix/suffix to
   entries.  Takes one argument (COMPLETIONS) and should return a list
   of annotated completions.  The elements of the list must be
   three-element lists: completion, its prefix and suffix.  This
   function takes priority over `annotation-function' when both are
   provided, so only this function is used.
- `group-function': function for grouping the completion candidates.
   Takes two arguments: a completion candidate (COMPLETION) and a
   boolean flag (TRANSFORM).  If TRANSFORM is nil, the function
   returns the group title of the group to which the candidate
   belongs.  The returned title may be nil.  Otherwise the function
   returns the transformed candidate.  The transformation can remove a
   redundant prefix, which is displayed in the group title.
- `display-sort-function': function to sort entries in *Completions*.
   Takes one argument (COMPLETIONS) and should return a new list
   of completions.  Can operate destructively.
- `cycle-sort-function': function to sort entries when cycling.
   Works like `display-sort-function'.
The metadata of a completion table should be constant between two boundaries."
  (let ((metadata (if (functionp table)
                      (funcall table string pred 'metadata))))
    (cons 'metadata
          (if (eq (car-safe metadata) 'metadata)
              (cdr metadata)))))

(defun completion--field-metadata (field-start)
  (completion-metadata (buffer-substring-no-properties field-start (point))
                       minibuffer-completion-table
                       minibuffer-completion-predicate))

(defun completion-metadata-get (metadata prop)
  (cdr (assq prop metadata)))

(defun completion--some (fun xs)
  "Apply FUN to each element of XS in turn.
Return the first non-nil returned value.
Like CL's `some'."
  (let ((firsterror nil)
        res)
    (while (and (not res) xs)
      (condition-case-unless-debug err
          (setq res (funcall fun (pop xs)))
        (error (unless firsterror (setq firsterror err)) nil)))
    (or res
        (if firsterror (signal (car firsterror) (cdr firsterror))))))

(defun complete-with-action (action collection string predicate)
  "Perform completion according to ACTION.
STRING, COLLECTION and PREDICATE are used as in `try-completion'.

If COLLECTION is a function, it will be called directly to
perform completion, no matter what ACTION is.

If ACTION is `metadata' or a list where the first element is
`boundaries', return nil.  If ACTION is nil, this function works
like `try-completion'; if it is t, this function works like
`all-completion'; and any other value makes it work like
`test-completion'."
  (cond
   ((functionp collection) (funcall collection string predicate action))
   ((eq (car-safe action) 'boundaries) nil)
   ((eq action 'metadata) nil)
   (t
    (funcall
     (cond
      ((null action) 'try-completion)
      ((eq action t) 'all-completions)
      (t 'test-completion))
     string collection predicate))))

(defun completion-table-dynamic (fun &optional switch-buffer)
  "Use function FUN as a dynamic completion table.
FUN is called with one argument, the string for which completion is requested,
and it should return a completion table containing all the intended possible
completions.
This table is allowed to include elements that do not actually match the
string: they will be automatically filtered out.
The completion table returned by FUN can use any of the usual formats of
completion tables such as lists, alists, and hash-tables.

If SWITCH-BUFFER is non-nil and completion is performed in the
minibuffer, FUN will be called in the buffer from which the minibuffer
was entered.

The result of the `completion-table-dynamic' form is a function
that can be used as the COLLECTION argument to `try-completion' and
`all-completions'.  See Info node `(elisp)Programmed Completion'.
The completion table returned by `completion-table-dynamic' has empty
metadata and trivial boundaries.

See also the related function `completion-table-with-cache'."
  (lambda (string pred action)
    (if (or (eq (car-safe action) 'boundaries) (eq action 'metadata))
        ;; `fun' is not supposed to return another function but a plain old
        ;; completion table, whose boundaries are always trivial.
        nil
      (with-current-buffer (if (not switch-buffer) (current-buffer)
                             (let ((win (minibuffer-selected-window)))
                               (if (window-live-p win) (window-buffer win)
                                 (current-buffer))))
        (complete-with-action action (funcall fun string) string pred)))))

(defun completion-table-with-cache (fun &optional ignore-case)
  "Create dynamic completion table from function FUN, with cache.
This is a wrapper for `completion-table-dynamic' that saves the last
argument-result pair from FUN, so that several lookups with the
same argument (or with an argument that starts with the first one)
only need to call FUN once.  This can be useful when FUN performs a
relatively slow operation, such as calling an external process.

When IGNORE-CASE is non-nil, FUN is expected to be case-insensitive."
  ;; See eg bug#11906.
  (let* (last-arg last-result
         (new-fun
          (lambda (arg)
            (if (and last-arg (string-prefix-p last-arg arg ignore-case))
                last-result
              (prog1
                  (setq last-result (funcall fun arg))
                (setq last-arg arg))))))
    (completion-table-dynamic new-fun)))

(defmacro lazy-completion-table (var fun)
  "Initialize variable VAR as a lazy completion table.
If the completion table VAR is used for the first time (e.g., by passing VAR
as an argument to `try-completion'), the function FUN is called with no
arguments.  FUN must return the completion table that will be stored in VAR.
If completion is requested in the minibuffer, FUN will be called in the buffer
from which the minibuffer was entered.  The return value of
`lazy-completion-table' must be used to initialize the value of VAR.

You should give VAR a non-nil `risky-local-variable' property."
  (declare (debug (symbolp lambda-expr)))
  (let ((str (make-symbol "string")))
    `(completion-table-dynamic
      (lambda (,str)
        (when (functionp ,var)
          (setq ,var (funcall #',fun)))
        ,var)
      'do-switch-buffer)))

(defun completion-table-case-fold (table &optional dont-fold)
  "Return new completion TABLE that is case insensitive.
If DONT-FOLD is non-nil, return a completion table that is
case sensitive instead."
  (lambda (string pred action)
    (let ((completion-ignore-case (not dont-fold)))
      (complete-with-action action table string pred))))

(defun completion-table-subvert (table s1 s2)
  "Return a completion table from TABLE with S1 replaced by S2.
The result is a completion table which completes strings of the
form (concat S1 S) in the same way as TABLE completes strings of
the form (concat S2 S)."
  (lambda (string pred action)
    (let* ((str (if (string-prefix-p s1 string completion-ignore-case)
                    (concat s2 (substring string (length s1)))))
           (res (if str (complete-with-action action table str pred))))
      (when (or res (eq (car-safe action) 'boundaries))
        (cond
         ((eq (car-safe action) 'boundaries)
          (let ((beg (or (and (eq (car-safe res) 'boundaries) (cadr res)) 0)))
            `(boundaries
              ,(max (length s1)
                    (+ beg (- (length s1) (length s2))))
              . ,(and (eq (car-safe res) 'boundaries) (cddr res)))))
         ((stringp res)
          (if (string-prefix-p s2 res completion-ignore-case)
              (concat s1 (substring res (length s2)))))
         ((eq action t)
          (let ((bounds (completion-boundaries str table pred "")))
            (if (>= (car bounds) (length s2))
                res
              (let ((re (concat "\\`"
                                (regexp-quote (substring s2 (car bounds))))))
                (delq nil
                      (mapcar (lambda (c)
                                (if (string-match re c)
                                    (substring c (match-end 0))))
                              res))))))
         ;; E.g. action=nil and it's the only completion.
         (res))))))

(defun completion-table-with-context (prefix table string pred action)
  ;; TODO: add `suffix' maybe?
  (let ((pred
         (if (not (functionp pred))
             ;; Notice that `pred' may not be a function in some abusive cases.
             pred
           ;; Predicates are called differently depending on the nature of
           ;; the completion table :-(
           (cond
            ((vectorp table)            ;Obarray.
             (lambda (sym) (funcall pred (concat prefix (symbol-name sym)))))
            ((hash-table-p table)
             (lambda (s _v) (funcall pred (concat prefix s))))
            ((functionp table)
             (lambda (s) (funcall pred (concat prefix s))))
            (t                          ;Lists and alists.
             (lambda (s)
               (funcall pred (concat prefix (if (consp s) (car s) s)))))))))
    (if (eq (car-safe action) 'boundaries)
        (let* ((len (length prefix))
               (bound (completion-boundaries string table pred (cdr action))))
          `(boundaries ,(+ (car bound) len) . ,(cdr bound)))
      (let ((comp (complete-with-action action table string pred)))
        (cond
         ;; In case of try-completion, add the prefix.
         ((stringp comp) (concat prefix comp))
         (t comp))))))

(defun completion-table-with-terminator (terminator table string pred action)
  "Construct a completion table like TABLE but with an extra TERMINATOR.
This is meant to be called in a curried way by first passing TERMINATOR
and TABLE only (via `apply-partially').
TABLE is a completion table, and TERMINATOR is a string appended to TABLE's
completion if it is complete.  TERMINATOR is also used to determine the
completion suffix's boundary.
TERMINATOR can also be a cons cell (TERMINATOR . TERMINATOR-REGEXP)
in which case TERMINATOR-REGEXP is a regular expression whose submatch
number 1 should match TERMINATOR.  This is used when there is a need to
distinguish occurrences of the TERMINATOR strings which are really terminators
from others (e.g. escaped).  In this form, the car of TERMINATOR can also be,
instead of a string, a function that takes the completion and returns the
\"terminated\" string."
  ;; FIXME: This implementation is not right since it only adds the terminator
  ;; in try-completion, so any completion-style that builds the completion via
  ;; all-completions won't get the terminator, and selecting an entry in
  ;; *Completions* won't get the terminator added either.
  (cond
   ((eq (car-safe action) 'boundaries)
    (let* ((suffix (cdr action))
           (bounds (completion-boundaries string table pred suffix))
           (terminator-regexp (if (consp terminator)
                                  (cdr terminator) (regexp-quote terminator)))
           (max (and terminator-regexp
                     (string-match terminator-regexp suffix))))
      `(boundaries ,(car bounds)
                   . ,(min (cdr bounds) (or max (length suffix))))))
   ((eq action nil)
    (let ((comp (try-completion string table pred)))
      (if (consp terminator) (setq terminator (car terminator)))
      (if (eq comp t)
          (if (functionp terminator)
              (funcall terminator string)
            (concat string terminator))
        (if (and (stringp comp) (not (zerop (length comp)))
                 ;; Try to avoid the second call to try-completion, since
                 ;; it may be very inefficient (because `comp' made us
                 ;; jump to a new boundary, so we complete in that
                 ;; boundary with an empty start string).
                 (let ((newbounds (completion-boundaries comp table pred "")))
                   (< (car newbounds) (length comp)))
                 (eq (try-completion comp table pred) t))
            (if (functionp terminator)
                (funcall terminator comp)
              (concat comp terminator))
          comp))))
   ;; completion-table-with-terminator is always used for
   ;; "sub-completions" so it's only called if the terminator is missing,
   ;; in which case `test-completion' should return nil.
   ((eq action 'lambda) nil)
   (t
    ;; FIXME: We generally want the `try' and `all' behaviors to be
    ;; consistent so pcm can merge the `all' output to get the `try' output,
    ;; but that sometimes clashes with the need for `all' output to look
    ;; good in *Completions*.
    ;; (mapcar (lambda (s) (concat s terminator))
    ;;         (all-completions string table pred))))
    (complete-with-action action table string pred))))

(defun completion-table-with-predicate (table pred1 strict string pred2 action)
  "Make a completion table equivalent to TABLE but filtered through PRED1.
PRED1 is a function of one argument which returns non-nil if and
only if the argument is an element of TABLE which should be
considered for completion.  STRING, PRED2, and ACTION are the
usual arguments to completion tables, as described in
`try-completion', `all-completions', and `test-completion'.  If
STRICT is non-nil, the predicate always applies; if nil it only
applies if it does not reduce the set of possible completions to
nothing.  Note: TABLE needs to be a proper completion table which
obeys predicates."
  (cond
   ((and (not strict) (eq action 'lambda))
    ;; Ignore pred1 since it doesn't really have to apply anyway.
    (test-completion string table pred2))
   (t
    (or (complete-with-action action table string
                              (if (not (and pred1 pred2))
                                  (or pred1 pred2)
                                (lambda (x)
                                  ;; Call `pred1' first, so that `pred2'
                                  ;; really can't tell that `x' is in table.
                                  (and (funcall pred1 x) (funcall pred2 x)))))
        ;; If completion failed and we're not applying pred1 strictly, try
        ;; again without pred1.
        (and (not strict) pred1
             (complete-with-action action table string pred2))))))

(defun completion-table-in-turn (&rest tables)
  "Create a completion table that tries each table in TABLES in turn."
  ;; FIXME: the boundaries may come from TABLE1 even when the completion list
  ;; is returned by TABLE2 (because TABLE1 returned an empty list).
  ;; Same potential problem if any of the tables use quoting.
  (lambda (string pred action)
    (completion--some (lambda (table)
                        (complete-with-action action table string pred))
                      tables)))

(defun completion-table-merge (&rest tables)
  "Create a completion table that collects completions from all TABLES."
  ;; FIXME: same caveats as in `completion-table-in-turn'.
  (lambda (string pred action)
    (cond
     ((null action)
      (let ((retvals (mapcar (lambda (table)
                               (try-completion string table pred))
                             tables)))
        (if (member string retvals)
            string
          (try-completion string
                          (mapcar (lambda (value)
                                    (if (eq value t) string value))
                                  (delq nil retvals))
                          pred))))
     ((eq action t)
      (apply #'append (mapcar (lambda (table)
                                (all-completions string table pred))
                              tables)))
     (t
      (completion--some (lambda (table)
                          (complete-with-action action table string pred))
                        tables)))))

(defun completion-table-with-quoting (table unquote requote)
  ;; A difficult part of completion-with-quoting is to map positions in the
  ;; quoted string to equivalent positions in the unquoted string and
  ;; vice-versa.  There is no efficient and reliable algorithm that works for
  ;; arbitrary quote and unquote functions.
  ;; So to map from quoted positions to unquoted positions, we simply assume
  ;; that `concat' and `unquote' commute (which tends to be the case).
  ;; And we ask `requote' to do the work of mapping from unquoted positions
  ;; back to quoted positions.
  ;; FIXME: For some forms of "quoting" such as the truncation behavior of
  ;; substitute-in-file-name, it would be desirable not to requote completely.
  "Return a new completion table operating on quoted text.
TABLE operates on the unquoted text.
UNQUOTE is a function that takes a string and returns a new unquoted string.
REQUOTE is a function of 2 args (UPOS QSTR) where
  QSTR is a string entered by the user (and hence indicating
  the user's preferred form of quoting); and
  UPOS is a position within the unquoted form of QSTR.
REQUOTE should return a pair (QPOS . QFUN) such that QPOS is the
position corresponding to UPOS but in QSTR, and QFUN is a function
of one argument (a string) which returns that argument appropriately quoted
for use at QPOS."
  ;; FIXME: One problem with the current setup is that `qfun' doesn't know if
  ;; its argument is "the end of the completion", so if the quoting used double
  ;; quotes (for example), we end up completing "fo" to "foobar and throwing
  ;; away the closing double quote.
  (lambda (string pred action)
    (cond
     ((eq action 'metadata)
      (append (completion-metadata string table pred)
              '((completion--unquote-requote . t))))

     ((eq action 'lambda) ;;test-completion
      (let ((ustring (funcall unquote string)))
        (test-completion ustring table pred)))

     ((eq (car-safe action) 'boundaries)
      (let* ((ustring (funcall unquote string))
             (qsuffix (cdr action))
             (ufull (if (zerop (length qsuffix)) ustring
                      (funcall unquote (concat string qsuffix))))
             ;; If (not (string-prefix-p ustring ufull)) we have a problem:
             ;; unquoting the qfull gives something "unrelated" to ustring.
             ;; E.g. "~/" and "/" where "~//" gets unquoted to just "/" (see
             ;; bug#47678).
             ;; In that case we can't even tell if we're right before the
             ;; "/" or right after it (aka if this "/" is from qstring or
             ;; from qsuffix), thus which usuffix to use is very unclear.
             (usuffix (if (string-prefix-p ustring ufull)
                          (substring ufull (length ustring))
                        ;; FIXME: Maybe "" is preferable/safer?
                        qsuffix))
             (boundaries (completion-boundaries ustring table pred usuffix))
             (qlboundary (car (funcall requote (car boundaries) string)))
             (qrboundary (if (zerop (cdr boundaries)) 0 ;Common case.
                           (let* ((urfullboundary
                                   (+ (cdr boundaries) (length ustring))))
                             (- (car (funcall requote urfullboundary
                                              (concat string qsuffix)))
                                (length string))))))
        `(boundaries ,qlboundary . ,qrboundary)))

     ;; In "normal" use a c-t-with-quoting completion table should never be
     ;; called with action in (t nil) because `completion--unquote' should have
     ;; been called before and would have returned a different completion table
     ;; to apply to the unquoted text.  But there's still a lot of code around
     ;; that likes to use all/try-completions directly, so we do our best to
     ;; handle those calls as well as we can.

     ((eq action nil) ;;try-completion
      (let* ((ustring (funcall unquote string))
             (completion (try-completion ustring table pred)))
        ;; Most forms of quoting allow several ways to quote the same string.
        ;; So here we could simply requote `completion' in a kind of
        ;; "canonical" quoted form without paying attention to the way
        ;; `string' was quoted.  But since we have to solve the more complex
        ;; problems of "pay attention to the original quoting" for
        ;; all-completions, we may as well use it here, since it provides
        ;; a nicer behavior.
        (if (not (stringp completion)) completion
          (car (completion--twq-try
                string ustring completion 0 unquote requote)))))

     ((eq action t) ;;all-completions
      ;; When all-completions is used for completion-try/all-completions
      ;; (e.g. for `pcm' style), we can't do the job properly here because
      ;; the caller will match our output against some pattern derived from
      ;; the user's (quoted) input, and we don't have access to that
      ;; pattern, so we can't know how to requote our output so that it
      ;; matches the quoting used in the pattern.  It is to fix this
      ;; fundamental problem that we have to introduce the new
      ;; unquote-requote method so that completion-try/all-completions can
      ;; pass the unquoted string to the style functions.
      (pcase-let*
          ((ustring (funcall unquote string))
           (completions (all-completions ustring table pred))
           (boundary (car (completion-boundaries ustring table pred "")))
           (completions
            (completion--twq-all
             string ustring completions boundary unquote requote))
           (last (last completions)))
        (when (consp last) (setcdr last nil))
        completions))

     ((eq action 'completion--unquote)
      ;; PRED is really a POINT in STRING.
      ;; We should return a new set (STRING TABLE POINT REQUOTE)
      ;; where STRING is a new (unquoted) STRING to match against the new TABLE
      ;; using a new POINT inside it, and REQUOTE is a requoting function which
      ;; should reverse the unquoting, (i.e. it receives the completion result
      ;; of using the new TABLE and should turn it into the corresponding
      ;; quoted result).
      (let* ((qpos pred)
	     (ustring (funcall unquote string))
	     (uprefix (funcall unquote (substring string 0 qpos)))
	     ;; FIXME: we really should pass `qpos' to `unquote' and have that
	     ;; function give us the corresponding `uqpos'.  But for now we
	     ;; presume (more or less) that `concat' and `unquote' commute.
	     (uqpos (if (string-prefix-p uprefix ustring)
			;; Yay!!  They do seem to commute!
			(length uprefix)
		      ;; They don't commute this time!  :-(
		      ;; Maybe qpos is in some text that disappears in the
		      ;; ustring (bug#17239).  Let's try a second chance guess.
		      (let ((usuffix (funcall unquote (substring string qpos))))
			(if (string-suffix-p usuffix ustring)
			    ;; Yay!!  They still "commute" in a sense!
			    (- (length ustring) (length usuffix))
			  ;; Still no luck!  Let's just choose *some* position
			  ;; within ustring.
			  (/ (+ (min (length uprefix) (length ustring))
				(max (- (length ustring) (length usuffix)) 0))
			     2))))))
        (list ustring table uqpos
              (lambda (unquoted-result op)
                (pcase op
                  (1 ;;try
                   (if (not (stringp (car-safe unquoted-result)))
                       unquoted-result
                     (completion--twq-try
                      string ustring
                      (car unquoted-result) (cdr unquoted-result)
                      unquote requote)))
                  (2 ;;all
                   (let* ((last (last unquoted-result))
                          (base (or (cdr last) 0)))
                     (when last
                       (setcdr last nil)
                       (completion--twq-all string ustring
                                            unquoted-result base
                                            unquote requote))))))))))))

(defun completion--twq-try (string ustring completion point
                                   unquote requote)
  ;; Basically two cases: either the new result is
  ;; - commonprefix1 <point> morecommonprefix <qpos> suffix
  ;; - commonprefix <qpos> newprefix <point> suffix
  (pcase-let*
      ((prefix (fill-common-string-prefix ustring completion))
       (suffix (substring completion (max point (length prefix))))
       (`(,qpos . ,qfun) (funcall requote (length prefix) string))
       (qstr1 (if (> point (length prefix))
                  (funcall qfun (substring completion (length prefix) point))))
       (qsuffix (funcall qfun suffix))
       (qstring (concat (substring string 0 qpos) qstr1 qsuffix))
       (qpoint
        (cond
         ((zerop point) 0)
         ((> point (length prefix)) (+ qpos (length qstr1)))
         (t (car (funcall requote point string))))))
    ;; Make sure `requote' worked.
    (if (equal (funcall unquote qstring) completion)
	(cons qstring qpoint)
      ;; If requote failed (e.g. because sifn-requote did not handle
      ;; Tramp's "/foo:/bar//baz -> /foo:/baz" truncation), then at least
      ;; try requote properly.
      (let ((qstr (funcall qfun completion)))
	(cons qstr (length qstr))))))

(defun completion--string-equal-p (s1 s2)
  (eq t (compare-strings s1 nil nil s2 nil nil 'ignore-case)))

(defun completion--twq-all (string ustring completions boundary
                                   _unquote requote)
  (when completions
    (pcase-let*
        ((prefix
          (let ((completion-regexp-list nil))
            (try-completion "" (cons (substring ustring boundary)
                                     completions))))
         (`(,qfullpos . ,qfun)
          (funcall requote (+ boundary (length prefix)) string))
         (qfullprefix (substring string 0 qfullpos))
	 ;; FIXME: This assertion can be wrong, e.g. in Cygwin, where
	 ;; (unquote "c:\bin") => "/usr/bin" but (unquote "c:\") => "/".
         ;;(cl-assert (completion--string-equal-p
         ;;            (funcall unquote qfullprefix)
         ;;            (concat (substring ustring 0 boundary) prefix))
         ;;           t))
         (qboundary (car (funcall requote boundary string)))
         (_ (cl-assert (<= qboundary qfullpos)))
         ;; FIXME: this split/quote/concat business messes up the carefully
         ;; placed completions-common-part and completions-first-difference
         ;; faces.  We could try within the mapcar loop to search for the
         ;; boundaries of those faces, pass them to `requote' to find their
         ;; equivalent positions in the quoted output and re-add the faces:
         ;; this might actually lead to correct results but would be
         ;; pretty expensive.
         ;; The better solution is to not quote the *Completions* display,
         ;; which nicely circumvents the problem.  The solution I used here
         ;; instead is to hope that `qfun' preserves the text-properties and
         ;; presume that the `first-difference' is not within the `prefix';
         ;; this presumption is not always true, but at least in practice it is
         ;; true in most cases.
         (qprefix (propertize (substring qfullprefix qboundary)
                              'face 'completions-common-part)))

      ;; Here we choose to quote all elements returned, but a better option
      ;; would be to return unquoted elements together with a function to
      ;; requote them, so that *Completions* can show nicer unquoted values
      ;; which only get quoted when needed by choose-completion.
      (nconc
       (mapcar (lambda (completion)
                 (cl-assert (string-prefix-p prefix completion 'ignore-case) t)
                 (let* ((new (substring completion (length prefix)))
                        (qnew (funcall qfun new))
 			(qprefix
                         (if (not completion-ignore-case)
                             qprefix
                           ;; Make qprefix inherit the case from `completion'.
                           (let* ((rest (substring completion
                                                   0 (length prefix)))
                                  (qrest (funcall qfun rest)))
                             (if (completion--string-equal-p qprefix qrest)
                                 (propertize qrest 'face
                                             'completions-common-part)
                               qprefix))))
                        (qcompletion (concat qprefix qnew)))
		   ;; FIXME: Similarly here, Cygwin's mapping trips this
		   ;; assertion.
                   ;;(cl-assert
                   ;; (completion--string-equal-p
		   ;;  (funcall unquote
		   ;;           (concat (substring string 0 qboundary)
		   ;;                   qcompletion))
		   ;;  (concat (substring ustring 0 boundary)
		   ;;          completion))
		   ;; t)
                   qcompletion))
               completions)
       qboundary))))

;;; Minibuffer completion

(defgroup minibuffer nil
  "Controlling the behavior of the minibuffer."
  :link '(custom-manual "(emacs)Minibuffer")
  :group 'environment)

(defvar minibuffer-message-properties nil
  "Text properties added to the text shown by `minibuffer-message'.")

(defun minibuffer-message (message &rest args)
  "Temporarily display MESSAGE at the end of the minibuffer.
The text is displayed for `minibuffer-message-timeout' seconds,
or until the next input event arrives, whichever comes first.
Enclose MESSAGE in [...] if this is not yet the case.
If ARGS are provided, then pass MESSAGE through `format-message'."
  (if (not (minibufferp (current-buffer) t))
      (progn
        (if args
            (apply #'message message args)
          (message "%s" message))
        (prog1 (sit-for (or minibuffer-message-timeout 1000000))
          (message nil)))
    ;; Clear out any old echo-area message to make way for our new thing.
    (message nil)
    (setq message (if (and (null args)
                           (string-match-p "\\` *\\[.+\\]\\'" message))
                      ;; Make sure we can put-text-property.
                      (copy-sequence message)
                    (concat " [" message "]")))
    (when args (setq message (apply #'format-message message args)))
    (unless (or (null minibuffer-message-properties)
                ;; Don't overwrite the face properties the caller has set
                (text-properties-at 0 message))
      (setq message (apply #'propertize message minibuffer-message-properties)))
    ;; Put overlay either on `minibuffer-message' property, or at EOB.
    (let* ((ovpos (minibuffer--message-overlay-pos))
           (ol (make-overlay ovpos ovpos nil t t))
           ;; A quit during sit-for normally only interrupts the sit-for,
           ;; but since minibuffer-message is used at the end of a command,
           ;; at a time when the command has virtually finished already, a C-g
           ;; should really cause an abort-recursive-edit instead (i.e. as if
           ;; the C-g had been typed at top-level).  Binding inhibit-quit here
           ;; is an attempt to get that behavior.
           (inhibit-quit t))
      (unwind-protect
          (progn
            (unless (zerop (length message))
              ;; The current C cursor code doesn't know to use the overlay's
              ;; marker's stickiness to figure out whether to place the cursor
              ;; before or after the string, so let's spoon-feed it the pos.
              (put-text-property 0 1 'cursor t message))
            (overlay-put ol 'after-string message)
            ;; Make sure the overlay with the message is displayed before
            ;; any other overlays in that position, in case they have
            ;; resize-mini-windows set to nil and the other overlay strings
            ;; are too long for the mini-window width.  This makes sure the
            ;; temporary message will always be visible.
            (overlay-put ol 'priority 1100)
            (sit-for (or minibuffer-message-timeout 1000000)))
        (delete-overlay ol)))))

(defcustom minibuffer-message-clear-timeout nil
  "How long to display an echo-area message when the minibuffer is active.
If the value is a number, it is the time in seconds after which to
remove the echo-area message from the active minibuffer.
If the value is not a number, such messages are never removed,
and their text is displayed until the next input event arrives.
Unlike `minibuffer-message-timeout' used by `minibuffer-message',
this option affects the pair of functions `set-minibuffer-message'
and `clear-minibuffer-message' called automatically via
`set-message-function' and `clear-message-function'."
  :type '(choice (const :tag "Never time out" nil)
                 (integer :tag "Wait for the number of seconds" 2))
  :version "27.1")

(defvar minibuffer-message-timer nil)
(defvar minibuffer-message-overlay nil)

(defun minibuffer--message-overlay-pos ()
  "Return position where minibuffer message functions shall put message overlay.
The minibuffer message functions include `minibuffer-message' and
`set-minibuffer-message'."
  ;; Starting from point, look for non-nil `minibuffer-message'
  ;; property, and return its position.  If none found, return the EOB
  ;; position.
  (let* ((pt (point))
         (propval (get-text-property pt 'minibuffer-message)))
    (if propval pt
      (next-single-property-change pt 'minibuffer-message nil (point-max)))))

(defun set-minibuffer-message (message)
  "Temporarily display MESSAGE at the end of the minibuffer.
If some part of the minibuffer text has the `minibuffer-message' property,
the message will be displayed before the first such character, instead of
at the end of the minibuffer.
The text is displayed for `minibuffer-message-clear-timeout' seconds
\(if the value is a number), or until the next input event arrives,
whichever comes first.
Unlike `minibuffer-message', this function is called automatically
via `set-message-function'."
  (let* ((minibuf-window (active-minibuffer-window))
         (minibuf-frame (and (window-live-p minibuf-window)
                             (window-frame minibuf-window))))
    (when (and (not noninteractive)
               (window-live-p minibuf-window)
               (or (eq (window-frame) minibuf-frame)
                   (eq (frame-parameter minibuf-frame 'minibuffer) 'only)))
      (with-current-buffer (window-buffer minibuf-window)
        (setq message (if (string-match-p "\\` *\\[.+\\]\\'" message)
                          ;; Make sure we can put-text-property.
                          (copy-sequence message)
                        (concat " [" message "]")))
        (unless (or (null minibuffer-message-properties)
                    ;; Don't overwrite the face properties the caller has set
                    (text-properties-at 0 message))
          (setq message
                (apply #'propertize message minibuffer-message-properties)))

        (clear-minibuffer-message)

        (let ((ovpos (minibuffer--message-overlay-pos)))
          (setq minibuffer-message-overlay
                (make-overlay ovpos ovpos nil t t)))
        (unless (zerop (length message))
          ;; The current C cursor code doesn't know to use the overlay's
          ;; marker's stickiness to figure out whether to place the cursor
          ;; before or after the string, so let's spoon-feed it the pos.
          (put-text-property 0 1 'cursor t message))
        (overlay-put minibuffer-message-overlay 'after-string message)
        ;; Make sure the overlay with the message is displayed before
        ;; any other overlays in that position, in case they have
        ;; resize-mini-windows set to nil and the other overlay strings
        ;; are too long for the mini-window width.  This makes sure the
        ;; temporary message will always be visible.
        (overlay-put minibuffer-message-overlay 'priority 1100)

        (when (numberp minibuffer-message-clear-timeout)
          (setq minibuffer-message-timer
                (run-with-timer minibuffer-message-clear-timeout nil
                                #'clear-minibuffer-message)))

        ;; Return `t' telling the caller that the message
        ;; was handled specially by this function.
        t))))

(setq set-message-function 'set-minibuffer-message)

(defun clear-minibuffer-message ()
  "Clear minibuffer message.
Intended to be called via `clear-message-function'."
  (when (not noninteractive)
    (when (timerp minibuffer-message-timer)
      (cancel-timer minibuffer-message-timer)
      (setq minibuffer-message-timer nil))
    (when (overlayp minibuffer-message-overlay)
      (delete-overlay minibuffer-message-overlay)
      (setq minibuffer-message-overlay nil))))

(setq clear-message-function 'clear-minibuffer-message)

(defun minibuffer-completion-contents ()
  "Return the user input in a minibuffer before point as a string.
In Emacs 22, that was what completion commands operated on.
If the current buffer is not a minibuffer, return everything before point."
  (declare (obsolete nil "24.4"))
  (buffer-substring (minibuffer-prompt-end) (point)))

(defun delete-minibuffer-contents ()
  "Delete all user input in a minibuffer.
If the current buffer is not a minibuffer, erase its entire contents."
  (interactive)
  ;; We used to do `delete-field' here, but when file name shadowing
  ;; is on, the field doesn't cover the entire minibuffer contents.
  (delete-region (minibuffer-prompt-end) (point-max)))

(defun minibuffer--completion-prompt-end ()
  (let ((end (minibuffer-prompt-end)))
    (if (< (point) end)
        (user-error "Can't complete in prompt")
      end)))

(defvar completion-show-inline-help t
  "If non-nil, print helpful inline messages during completion.")

(defcustom completion-auto-help t
  "Non-nil means automatically provide help for invalid completion input.
If the value is t the *Completions* buffer is displayed whenever completion
is requested but cannot be done.
If the value is `lazy', the *Completions* buffer is only displayed after
the second failed attempt to complete."
  :type '(choice (const nil) (const t) (const lazy)))

(defconst completion-styles-alist
  '((emacs21
     completion-emacs21-try-completion completion-emacs21-all-completions
     "Simple prefix-based completion.
I.e. when completing \"foo_bar\" (where _ is the position of point),
it will consider all completions candidates matching the glob
pattern \"foobar*\".")
    (emacs22
     completion-emacs22-try-completion completion-emacs22-all-completions
     "Prefix completion that only operates on the text before point.
I.e. when completing \"foo_bar\" (where _ is the position of point),
it will consider all completions candidates matching the glob
pattern \"foo*\" and will add back \"bar\" to the end of it.")
    (basic
     completion-basic-try-completion completion-basic-all-completions
     "Completion of the prefix before point and the suffix after point.
I.e. when completing \"foo_bar\" (where _ is the position of point),
it will consider all completions candidates matching the glob
pattern \"foo*bar*\".")
    (partial-completion
     completion-pcm-try-completion completion-pcm-all-completions
     "Completion of multiple words, each one taken as a prefix.
I.e. when completing \"l-co_h\" (where _ is the position of point),
it will consider all completions candidates matching the glob
pattern \"l*-co*h*\".
Furthermore, for completions that are done step by step in subfields,
the method is applied to all the preceding fields that do not yet match.
E.g. C-x C-f /u/mo/s TAB could complete to /usr/monnier/src.
Additionally the user can use the char \"*\" as a glob pattern.")
    (substring
     completion-substring-try-completion completion-substring-all-completions
     "Completion of the string taken as a substring.
I.e. when completing \"foo_bar\" (where _ is the position of point),
it will consider all completions candidates matching the glob
pattern \"*foo*bar*\".")
    (flex
     completion-flex-try-completion completion-flex-all-completions
     "Completion of an in-order subset of characters.
When completing \"foo\" the glob \"*f*o*o*\" is used, so that
\"foo\" can complete to \"frodo\".")
    (initials
     completion-initials-try-completion completion-initials-all-completions
     "Completion of acronyms and initialisms.
E.g. can complete M-x lch to list-command-history
and C-x C-f ~/sew to ~/src/emacs/work."))
  "List of available completion styles.
Each element has the form (NAME TRY-COMPLETION ALL-COMPLETIONS DOC):
where NAME is the name that should be used in `completion-styles',
TRY-COMPLETION is the function that does the completion (it should
follow the same calling convention as `completion-try-completion'),
ALL-COMPLETIONS is the function that lists the completions (it should
follow the calling convention of `completion-all-completions'),
and DOC describes the way this style of completion works.")

(defconst completion--styles-type
  `(repeat :tag "insert a new menu to add more styles"
           (choice ,@(mapcar (lambda (x) (list 'const (car x)))
                             completion-styles-alist))))
(defconst completion--cycling-threshold-type
  '(choice (const :tag "No cycling" nil)
           (const :tag "Always cycle" t)
           (integer :tag "Threshold")))

(defcustom completion-styles
  ;; First, use `basic' because prefix completion has been the standard
  ;; for "ever" and works well in most cases, so using it first
  ;; ensures that we obey previous behavior in most cases.
  '(basic
    ;; Then use `partial-completion' because it has proven to
    ;; be a very convenient extension.
    partial-completion
    ;; Finally use `emacs22' so as to maintain (in many/most cases)
    ;; the previous behavior that when completing "foobar" with point
    ;; between "foo" and "bar" the completion try to complete "foo"
    ;; and simply add "bar" to the end of the result.
    emacs22)
  "List of completion styles to use.
The available styles are listed in `completion-styles-alist'.

Note that `completion-category-overrides' may override these
styles for specific categories, such as files, buffers, etc."
  :type completion--styles-type
  :version "23.1")

(defvar completion-category-defaults
  '((buffer (styles . (basic substring)))
    (unicode-name (styles . (basic substring)))
    ;; A new style that combines substring and pcm might be better,
    ;; e.g. one that does not anchor to bos.
    (project-file (styles . (substring)))
    (xref-location (styles . (substring)))
    (info-menu (styles . (basic substring))))
  "Default settings for specific completion categories.
Each entry has the shape (CATEGORY . ALIST) where ALIST is
an association list that can specify properties such as:
- `styles': the list of `completion-styles' to use for that category.
- `cycle': the `completion-cycle-threshold' to use for that category.
Categories are symbols such as `buffer' and `file', used when
completing buffer and file names, respectively.")

(defcustom completion-category-overrides nil
  "List of category-specific user overrides for completion styles.
Each override has the shape (CATEGORY . ALIST) where ALIST is
an association list that can specify properties such as:
- `styles': the list of `completion-styles' to use for that category.
- `cycle': the `completion-cycle-threshold' to use for that category.
Categories are symbols such as `buffer' and `file', used when
completing buffer and file names, respectively.
This overrides the defaults specified in `completion-category-defaults'."
  :version "25.1"
  :type `(alist :key-type (choice :tag "Category"
				  (const buffer)
                                  (const file)
                                  (const unicode-name)
				  (const bookmark)
                                  symbol)
          :value-type
          (set :tag "Properties to override"
	   (cons :tag "Completion Styles"
		 (const :tag "Select a style from the menu;" styles)
		 ,completion--styles-type)
           (cons :tag "Completion Cycling"
		 (const :tag "Select one value from the menu." cycle)
                 ,completion--cycling-threshold-type))))

(defun completion--category-override (category tag)
  (or (assq tag (cdr (assq category completion-category-overrides)))
      (assq tag (cdr (assq category completion-category-defaults)))))

(defun completion--styles (metadata)
  (let* ((cat (completion-metadata-get metadata 'category))
         (over (completion--category-override cat 'styles)))
    (if over
        (delete-dups (append (cdr over) (copy-sequence completion-styles)))
       completion-styles)))

(defun completion--nth-completion (n string table pred point metadata)
  "Call the Nth method of completion styles."
  ;; We provide special support for quoting/unquoting here because it cannot
  ;; reliably be done within the normal completion-table routines: Completion
  ;; styles such as `substring' or `partial-completion' need to match the
  ;; output of all-completions with the user's input, and since most/all
  ;; quoting mechanisms allow several equivalent quoted forms, the
  ;; completion-style can't do this matching (e.g. `substring' doesn't know
  ;; that "\a\b\e" is a valid (quoted) substring of "label").
  ;; The quote/unquote function needs to come from the completion table (rather
  ;; than from completion-extra-properties) because it may apply only to some
  ;; part of the string (e.g. substitute-in-file-name).
  (let* ((md (or metadata
                 (completion-metadata (substring string 0 point) table pred)))
         (requote
          (when (and
                 (completion-metadata-get md 'completion--unquote-requote)
                 ;; Sometimes a table's metadata is used on another
                 ;; table (typically that other table is just a list taken
                 ;; from the output of `all-completions' or something
                 ;; equivalent, for progressive refinement).
                 ;; See bug#28898 and bug#16274.
                 ;; FIXME: Rather than do nothing, we should somehow call
                 ;; the original table, in that case!
                 (functionp table))
            (let ((new (funcall table string point 'completion--unquote)))
              (setq string (pop new))
              (setq table (pop new))
              (setq point (pop new))
              (cl-assert (<= point (length string)))
              (pop new))))
         (result-and-style
          (completion--some
           (lambda (style)
             (let ((probe (funcall (nth n (assq style
                                                completion-styles-alist))
                                   string table pred point)))
               (and probe (cons probe style))))
           (completion--styles md)))
         (adjust-fn (get (cdr result-and-style) 'completion--adjust-metadata)))
    (when (and adjust-fn metadata)
      (setcdr metadata (cdr (funcall adjust-fn metadata))))
    (if requote
        (funcall requote (car result-and-style) n)
      (car result-and-style))))

(defun completion-try-completion (string table pred point &optional metadata)
  "Try to complete STRING using completion table TABLE.
Only the elements of table that satisfy predicate PRED are considered.
POINT is the position of point within STRING.
The return value can be either nil to indicate that there is no completion,
t to indicate that STRING is the only possible completion,
or a pair (NEWSTRING . NEWPOINT) of the completed result string together with
a new position for point."
  (completion--nth-completion 1 string table pred point metadata))

(defun completion-all-completions (string table pred point &optional metadata)
  "List the possible completions of STRING in completion table TABLE.
Only the elements of table that satisfy predicate PRED are considered.
POINT is the position of point within STRING.
The return value is a list of completions and may contain the base-size
in the last `cdr'."
  ;; FIXME: We need to additionally return the info needed for the
  ;; second part of completion-base-position.
  (completion--nth-completion 2 string table pred point metadata))

(defun minibuffer--bitset (modified completions exact)
  (logior (if modified    4 0)
          (if completions 2 0)
          (if exact       1 0)))

(defun completion--replace (beg end newtext)
  "Replace the buffer text between BEG and END with NEWTEXT.
Moves point to the end of the new text."
  ;; The properties on `newtext' include things like the
  ;; `completions-first-difference' face, which we don't want to
  ;; include upon insertion.
  (if minibuffer-allow-text-properties
      ;; If we're preserving properties, then just remove the faces
      ;; and other properties added by the completion machinery.
      (remove-text-properties 0 (length newtext) '(face completion-score)
                              newtext)
    ;; Remove all text properties.
    (set-text-properties 0 (length newtext) nil newtext))
  ;; Maybe this should be in subr.el.
  ;; You'd think this is trivial to do, but details matter if you want
  ;; to keep markers "at the right place" and be robust in the face of
  ;; after-change-functions that may themselves modify the buffer.
  (let ((prefix-len 0))
    ;; Don't touch markers in the shared prefix (if any).
    (while (and (< prefix-len (length newtext))
                (< (+ beg prefix-len) end)
                (eq (char-after (+ beg prefix-len))
                    (aref newtext prefix-len)))
      (setq prefix-len (1+ prefix-len)))
    (unless (zerop prefix-len)
      (setq beg (+ beg prefix-len))
      (setq newtext (substring newtext prefix-len))))
  (let ((suffix-len 0))
    ;; Don't touch markers in the shared suffix (if any).
    (while (and (< suffix-len (length newtext))
                (< beg (- end suffix-len))
                (eq (char-before (- end suffix-len))
                    (aref newtext (- (length newtext) suffix-len 1))))
      (setq suffix-len (1+ suffix-len)))
    (unless (zerop suffix-len)
      (setq end (- end suffix-len))
      (setq newtext (substring newtext 0 (- suffix-len))))
    (goto-char beg)
    (let ((length (- end beg)))         ;Read `end' before we insert the text.
      (insert-and-inherit newtext)
      (delete-region (point) (+ (point) length)))
    (forward-char suffix-len)))

(defcustom completion-cycle-threshold nil
  "Number of completion candidates below which cycling is used.
Depending on this setting `completion-in-region' may use cycling,
whereby invoking a completion command several times in a row
completes to each of the candidates in turn, in a cyclic manner.
If nil, cycling is never used.
If t, cycling is always used.
If an integer, cycling is used so long as there are not more
completion candidates than this number."
  :version "24.1"
  :type completion--cycling-threshold-type)

(defcustom completions-group nil
  "Enable grouping of completion candidates in the *Completions* buffer.
See also `completions-group-format' and `completions-group-sort'."
  :type 'boolean
  :version "28.1")

(defcustom completions-group-sort nil
  "Sort groups in the *Completions* buffer.

The value can either be nil to disable sorting, `alphabetical' for
alphabetical sorting or a custom sorting function.  The sorting
function takes and returns an alist of groups, where each element is a
pair of a group title string and a list of group candidate strings."
  :type '(choice (const :tag "No sorting" nil)
                 (const :tag "Alphabetical sorting" alphabetical)
                 function)
  :version "28.1")

(defcustom completions-group-format
  (concat
   (propertize "    " 'face 'completions-group-separator)
   (propertize " %s " 'face 'completions-group-title)
   (propertize " " 'face 'completions-group-separator
               'display '(space :align-to right)))
  "Format string used for the group title."
  :type 'string
  :version "28.1")

(defface completions-group-title
  '((t :inherit shadow :slant italic))
  "Face used for the title text of the candidate group headlines."
  :version "28.1")

(defface completions-group-separator
  '((t :inherit shadow :strike-through t))
  "Face used for the separator lines between the candidate groups."
  :version "28.1")

(defun completion--cycle-threshold (metadata)
  (let* ((cat (completion-metadata-get metadata 'category))
         (over (completion--category-override cat 'cycle)))
    (if over (cdr over) completion-cycle-threshold)))

(defvar-local completion-all-sorted-completions nil)
(defvar-local completion--all-sorted-completions-location nil)
(defvar completion-cycling nil)      ;Function that takes down the cycling map.
(defvar completion-tab-width nil)

(defvar completion-fail-discreetly nil
  "If non-nil, stay quiet when there  is no match.")

(defun completion--message (msg)
  (if completion-show-inline-help
      (minibuffer-message msg)))

(defun completion--do-completion (beg end &optional
                                      try-completion-function expect-exact)
  "Do the completion and return a summary of what happened.
M = completion was performed, the text was Modified.
C = there were available Completions.
E = after completion we now have an Exact match.

 MCE
 000  0 no possible completion
 001  1 was already an exact and unique completion
 010  2 no completion happened
 011  3 was already an exact completion
 100  4 ??? impossible
 101  5 ??? impossible
 110  6 some completion happened
 111  7 completed to an exact completion

TRY-COMPLETION-FUNCTION is a function to use in place of `try-completion'.
EXPECT-EXACT, if non-nil, means that there is no need to tell the user
when the buffer's text is already an exact match."
  (let* ((string (buffer-substring beg end))
         (md (completion--field-metadata beg))
         (comp (funcall (or try-completion-function
                            #'completion-try-completion)
                        string
                        minibuffer-completion-table
                        minibuffer-completion-predicate
                        (- (point) beg)
                        md)))
    (cond
     ((null comp)
      (minibuffer-hide-completions)
      (unless completion-fail-discreetly
	(ding)
	(completion--message "No match"))
      (minibuffer--bitset nil nil nil))
     ((eq t comp)
      (minibuffer-hide-completions)
      (goto-char end)
      (completion--done string 'finished
                        (unless expect-exact "Sole completion"))
      (minibuffer--bitset nil nil t))   ;Exact and unique match.
     (t
      ;; `completed' should be t if some completion was done, which doesn't
      ;; include simply changing the case of the entered string.  However,
      ;; for appearance, the string is rewritten if the case changes.
      (let* ((comp-pos (cdr comp))
             (completion (car comp))
             (completed (not (eq t (compare-strings completion nil nil
                                                    string nil nil t))))
             (unchanged (eq t (compare-strings completion nil nil
                                               string nil nil nil))))
        (if unchanged
	    (goto-char end)
          ;; Insert in minibuffer the chars we got.
          (completion--replace beg end completion)
          (setq end (+ beg (length completion))))
	;; Move point to its completion-mandated destination.
	(forward-char (- comp-pos (length completion)))

        (if (not (or unchanged completed))
            ;; The case of the string changed, but that's all.  We're not sure
            ;; whether this is a unique completion or not, so try again using
            ;; the real case (this shouldn't recurse again, because the next
            ;; time try-completion will return either t or the exact string).
            (completion--do-completion beg end
                                       try-completion-function expect-exact)

          ;; It did find a match.  Do we match some possibility exactly now?
          (let* ((exact (test-completion completion
                                         minibuffer-completion-table
                                         minibuffer-completion-predicate))
                 (threshold (completion--cycle-threshold md))
                 (comps
                  ;; Check to see if we want to do cycling.  We do it
                  ;; here, after having performed the normal completion,
                  ;; so as to take advantage of the difference between
                  ;; try-completion and all-completions, for things
                  ;; like completion-ignored-extensions.
                  (when (and threshold
                             ;; Check that the completion didn't make
                             ;; us jump to a different boundary.
                             (or (not completed)
                                 (< (car (completion-boundaries
                                          (substring completion 0 comp-pos)
                                          minibuffer-completion-table
                                          minibuffer-completion-predicate
                                         ""))
                                   comp-pos)))
                   (completion-all-sorted-completions beg end))))
            (completion--flush-all-sorted-completions)
            (cond
             ((and (consp (cdr comps)) ;; There's something to cycle.
                   (not (ignore-errors
                          ;; This signal an (intended) error if comps is too
                          ;; short or if completion-cycle-threshold is t.
                          (consp (nthcdr threshold comps)))))
              ;; Not more than completion-cycle-threshold remaining
              ;; completions: let's cycle.
              (setq completed t exact t)
              (completion--cache-all-sorted-completions beg end comps)
              (minibuffer-force-complete beg end))
             (completed
              ;; We could also decide to refresh the completions,
              ;; if they're displayed (and assuming there are
              ;; completions left).
              (minibuffer-hide-completions)
              (if exact
                  ;; If completion did not put point at end of field,
                  ;; it's a sign that completion is not finished.
                  (completion--done completion
                                    (if (< comp-pos (length completion))
                                        'exact 'unknown))))
             ;; Show the completion table, if requested.
             ((not exact)
	      (if (pcase completion-auto-help
                    ('lazy (eq this-command last-command))
                    (_ completion-auto-help))
                  (minibuffer-completion-help beg end)
                (completion--message "Next char not unique")))
             ;; If the last exact completion and this one were the same, it
             ;; means we've already given a "Complete, but not unique" message
             ;; and the user's hit TAB again, so now we give him help.
             (t
              (if (and (eq this-command last-command) completion-auto-help)
                  (minibuffer-completion-help beg end))
              (completion--done completion 'exact
                                (unless expect-exact
                                  "Complete, but not unique"))))

            (minibuffer--bitset completed t exact))))))))

(defun minibuffer-complete ()
  "Complete the minibuffer contents as far as possible.
Return nil if there is no valid completion, else t.
If no characters can be completed, display a list of possible completions.
If you repeat this command after it displayed such a list,
scroll the window of possible completions."
  (interactive)
  (completion-in-region (minibuffer--completion-prompt-end) (point-max)
                        minibuffer-completion-table
                        minibuffer-completion-predicate))

(defun completion--in-region-1 (beg end)
  ;; If the previous command was not this,
  ;; mark the completion buffer obsolete.
  (setq this-command 'completion-at-point)
  (unless (eq 'completion-at-point last-command)
    (completion--flush-all-sorted-completions)
    (setq minibuffer-scroll-window nil))

  (cond
   ;; If there's a fresh completion window with a live buffer,
   ;; and this command is repeated, scroll that window.
   ((and (window-live-p minibuffer-scroll-window)
         (eq t (frame-visible-p (window-frame minibuffer-scroll-window))))
    (let ((window minibuffer-scroll-window))
      (with-current-buffer (window-buffer window)
        (if (pos-visible-in-window-p (point-max) window)
            ;; If end is in view, scroll up to the beginning.
            (set-window-start window (point-min) nil)
          ;; Else scroll down one screen.
          (with-selected-window window
	    (scroll-up)))
        nil)))
   ;; If we're cycling, keep on cycling.
   ((and completion-cycling completion-all-sorted-completions)
    (minibuffer-force-complete beg end)
    t)
   (t (pcase (completion--do-completion beg end)
        (#b000 nil)
        (_     t)))))

(defun completion--cache-all-sorted-completions (beg end comps)
  (add-hook 'after-change-functions
            #'completion--flush-all-sorted-completions nil t)
  (setq completion--all-sorted-completions-location
        (cons (copy-marker beg) (copy-marker end)))
  (setq completion-all-sorted-completions comps))

(defun completion--flush-all-sorted-completions (&optional start end _len)
  (unless (and start end
               (or (> start (cdr completion--all-sorted-completions-location))
                   (< end (car completion--all-sorted-completions-location))))
    (remove-hook 'after-change-functions
                 #'completion--flush-all-sorted-completions t)
    ;; Remove the transient map if applicable.
    (when completion-cycling
      (funcall (prog1 completion-cycling (setq completion-cycling nil))))
    (setq completion-all-sorted-completions nil)))

(defun completion--metadata (string base md-at-point table pred)
  ;; Like completion-metadata, but for the specific case of getting the
  ;; metadata at `base', which tends to trigger pathological behavior for old
  ;; completion tables which don't understand `metadata'.
  (let ((bounds (completion-boundaries string table pred "")))
    (if (eq (car bounds) base) md-at-point
      (completion-metadata (substring string 0 base) table pred))))

(defun minibuffer--sort-by-key (elems keyfun)
  "Return ELEMS sorted by increasing value of their KEYFUN.
KEYFUN takes an element of ELEMS and should return a numerical value."
  (mapcar #'cdr
          (sort (mapcar (lambda (x) (cons (funcall keyfun x) x)) elems)
                 #'car-less-than-car)))

(defun minibuffer--sort-by-position (hist elems)
  "Sort ELEMS by their position in HIST."
  (let ((hash (make-hash-table :test #'equal :size (length hist)))
        (index 0))
    ;; Record positions in hash
    (dolist (c hist)
      (unless (gethash c hash)
        (puthash c index hash))
      (cl-incf index))
    (minibuffer--sort-by-key
     elems (lambda (x) (gethash x hash most-positive-fixnum)))))

(defun minibuffer--sort-by-length-alpha (elems)
  "Sort ELEMS first by length, then alphabetically."
  (sort elems (lambda (c1 c2)
                (or (< (length c1) (length c2))
                    (and (= (length c1) (length c2))
                         (string< c1 c2))))))

(defun minibuffer--sort-preprocess-history (base)
  "Preprocess history.
Remove completion BASE prefix string from history elements."
  (let* ((def (if (stringp minibuffer-default)
                  minibuffer-default
                (car-safe minibuffer-default)))
         (hist (and (not (eq minibuffer-history-variable t))
                    (symbol-value minibuffer-history-variable)))
         (base-size (length base)))
    ;; Default comes first.
    (setq hist (if def (cons def hist) hist))
    ;; Drop base string from the history elements.
    (if (= base-size 0)
        hist
      (delq nil (mapcar
                 (lambda (c)
                   (when (string-prefix-p base c)
                     (substring c base-size)))
                 hist)))))

(defun minibuffer--group-by (group-fun sort-fun elems)
  "Group ELEMS by GROUP-FUN and sort groups by SORT-FUN."
  (let ((groups))
    (dolist (cand elems)
      (let* ((key (funcall group-fun cand nil))
             (group (assoc key groups)))
        (if group
            (setcdr group (cons cand (cdr group)))
          (push (list key cand) groups))))
    (setq groups (nreverse groups)
          groups (mapc (lambda (x)
                         (setcdr x (nreverse (cdr x))))
                       groups)
          groups (funcall sort-fun groups))
    (mapcan #'cdr groups)))

(defun completion-all-sorted-completions (&optional start end)
  (or completion-all-sorted-completions
      (let* ((start (or start (minibuffer-prompt-end)))
             (end (or end (point-max)))
             (string (buffer-substring start end))
             (md (completion--field-metadata start))
             (all (completion-all-completions
                   string
                   minibuffer-completion-table
                   minibuffer-completion-predicate
                   (- (point) start)
                   md))
             (last (last all))
             (base-size (or (cdr last) 0))
             (all-md (completion--metadata (buffer-substring-no-properties
                                            start (point))
                                           base-size md
                                           minibuffer-completion-table
                                           minibuffer-completion-predicate))
             (sort-fun (completion-metadata-get all-md 'cycle-sort-function)))
        (when last
          (setcdr last nil)

          ;; Delete duplicates: do it after setting last's cdr to nil (so
          ;; it's a proper list), and be careful to reset `last' since it
          ;; may be a different cons-cell.
          (setq all (delete-dups all))
          (setq last (last all))

          (if sort-fun
              (setq all (funcall sort-fun all))
            ;; Sort first by length and alphabetically.
            (setq all (minibuffer--sort-by-length-alpha all))
            ;; Sort by history position, put the default, if it
            ;; exists, on top.
            (when (minibufferp)
              (setq all (minibuffer--sort-by-position
                         (minibuffer--sort-preprocess-history
                          (substring string 0 base-size))
                         all))))

          ;; Cache the result.  This is not just for speed, but also so that
          ;; repeated calls to minibuffer-force-complete can cycle through
          ;; all possibilities.
          (completion--cache-all-sorted-completions
           start end (nconc all base-size))))))

(defun minibuffer-force-complete-and-exit ()
  "Complete the minibuffer with first of the matches and exit."
  (interactive)
  ;; If `completion-cycling' is t, then surely a
  ;; `minibuffer-force-complete' has already executed.  This is not
  ;; just for speed: the extra rotation caused by the second
  ;; unnecessary call would mess up the final result value
  ;; (bug#34116).
  (unless completion-cycling
    (minibuffer-force-complete nil nil 'dont-cycle))
  (completion--complete-and-exit
   (minibuffer--completion-prompt-end) (point-max) #'exit-minibuffer
   ;; If the previous completion completed to an element which fails
   ;; test-completion, then we shouldn't exit, but that should be rare.
   (lambda ()
     (if minibuffer--require-match
         (completion--message "Incomplete")
       ;; If a match is not required, exit after all.
       (exit-minibuffer)))))

(defun minibuffer-force-complete (&optional start end dont-cycle)
  "Complete the minibuffer to an exact match.
Repeated uses step through the possible completions.
DONT-CYCLE tells the function not to setup cycling."
  (interactive)
  (setq minibuffer-scroll-window nil)
  ;; FIXME: Need to deal with the extra-size issue here as well.
  ;; FIXME: ~/src/emacs/t<M-TAB>/lisp/minibuffer.el completes to
  ;; ~/src/emacs/trunk/ and throws away lisp/minibuffer.el.
  (let* ((start (copy-marker (or start (minibuffer--completion-prompt-end))))
         (end (or end (point-max)))
         ;; (md (completion--field-metadata start))
         (all (completion-all-sorted-completions start end))
         (base (+ start (or (cdr (last all)) 0))))
    (cond
     ((not (consp all))
      (completion--message
       (if all "No more completions" "No completions")))
     ((not (consp (cdr all)))
      (let ((done (equal (car all) (buffer-substring-no-properties base end))))
        (unless done (completion--replace base end (car all)))
        (completion--done (buffer-substring-no-properties start (point))
                          'finished (when done "Sole completion"))))
     (t
      (completion--replace base end (car all))
      (setq end (+ base (length (car all))))
      (completion--done (buffer-substring-no-properties start (point)) 'sole)
      (setq this-command 'completion-at-point) ;For completion-in-region.
      ;; Set cycling after modifying the buffer since the flush hook resets it.
      (unless dont-cycle
        ;; If completing file names, (car all) may be a directory, so we'd now
        ;; have a new set of possible completions and might want to reset
        ;; completion-all-sorted-completions to nil, but we prefer not to,
        ;; so that repeated calls minibuffer-force-complete still cycle
        ;; through the previous possible completions.
        (let ((last (last all)))
          (setcdr last (cons (car all) (cdr last)))
          (completion--cache-all-sorted-completions start end (cdr all)))
        ;; Make sure repeated uses cycle, even though completion--done might
        ;; have added a space or something that moved us outside of the field.
        ;; (bug#12221).
        (let* ((table minibuffer-completion-table)
               (pred minibuffer-completion-predicate)
               (extra-prop completion-extra-properties)
               (cmd
                (lambda () "Cycle through the possible completions."
                  (interactive)
                  (let ((completion-extra-properties extra-prop))
                    (completion-in-region start (point) table pred)))))
          (setq completion-cycling
                (set-transient-map
                 (let ((map (make-sparse-keymap)))
                   (define-key map [remap completion-at-point] cmd)
                   (define-key map (vector last-command-event) cmd)
                   map)))))))))

(defvar minibuffer-confirm-exit-commands
  '(completion-at-point minibuffer-complete
    minibuffer-complete-word PC-complete PC-complete-word)
  "List of commands which cause an immediately following
`minibuffer-complete-and-exit' to ask for extra confirmation.")

(defvar minibuffer--require-match nil
  "Value of REQUIRE-MATCH passed to `completing-read'.")

(defun minibuffer-complete-and-exit ()
  "Exit if the minibuffer contains a valid completion.
Otherwise, try to complete the minibuffer contents.  If
completion leads to a valid completion, a repetition of this
command will exit.

If `minibuffer-completion-confirm' is `confirm', do not try to
 complete; instead, ask for confirmation and accept any input if
 confirmed.
If `minibuffer-completion-confirm' is `confirm-after-completion',
 do not try to complete; instead, ask for confirmation if the
 preceding minibuffer command was a member of
 `minibuffer-confirm-exit-commands', and accept the input
 otherwise."
  (interactive)
  (completion-complete-and-exit (minibuffer--completion-prompt-end) (point-max)
                                #'exit-minibuffer))

(defun completion-complete-and-exit (beg end exit-function)
  (completion--complete-and-exit
   beg end exit-function
   (lambda ()
     (pcase (condition-case nil
                (completion--do-completion beg end
                                           nil 'expect-exact)
              (error 1))
       ((or #b001 #b011) (funcall exit-function))
       (#b111 (if (not minibuffer-completion-confirm)
                  (funcall exit-function)
                (minibuffer-message "Confirm")
                nil))
       (_ nil)))))

(defun completion--complete-and-exit (beg end
                                          exit-function completion-function)
  "Exit from `require-match' minibuffer.
COMPLETION-FUNCTION is called if the current buffer's content does not
appear to be a match."
    (cond
     ;; Allow user to specify null string
   ((= beg end) (funcall exit-function))
     ((test-completion (buffer-substring beg end)
                       minibuffer-completion-table
                       minibuffer-completion-predicate)
      ;; FIXME: completion-ignore-case has various slightly
      ;; incompatible meanings.  E.g. it can reflect whether the user
      ;; wants completion to pay attention to case, or whether the
      ;; string will be used in a context where case is significant.
      ;; E.g. usually try-completion should obey the first, whereas
      ;; test-completion should obey the second.
      (when completion-ignore-case
        ;; Fixup case of the field, if necessary.
        (let* ((string (buffer-substring beg end))
               (compl (try-completion
                       string
                       minibuffer-completion-table
                       minibuffer-completion-predicate)))
          (when (and (stringp compl) (not (equal string compl))
                     ;; If it weren't for this piece of paranoia, I'd replace
                     ;; the whole thing with a call to do-completion.
                     ;; This is important, e.g. when the current minibuffer's
                     ;; content is a directory which only contains a single
                     ;; file, so `try-completion' actually completes to
                     ;; that file.
                     (= (length string) (length compl)))
            (completion--replace beg end compl))))
      (funcall exit-function))

     ((memq minibuffer-completion-confirm '(confirm confirm-after-completion))
      ;; The user is permitted to exit with an input that's rejected
      ;; by test-completion, after confirming her choice.
      (if (or (eq last-command this-command)
              ;; For `confirm-after-completion' we only ask for confirmation
              ;; if trying to exit immediately after typing TAB (this
              ;; catches most minibuffer typos).
              (and (eq minibuffer-completion-confirm 'confirm-after-completion)
                   (not (memq last-command minibuffer-confirm-exit-commands))))
        (funcall exit-function)
        (minibuffer-message "Confirm")
        nil))

     (t
      ;; Call do-completion, but ignore errors.
      (funcall completion-function))))

(defun completion--try-word-completion (string table predicate point md)
  (let ((comp (completion-try-completion string table predicate point md)))
    (if (not (consp comp))
        comp

      ;; If completion finds next char not unique,
      ;; consider adding a space or a hyphen.
      (when (= (length string) (length (car comp)))
        ;; Mark the added char with the `completion-word' property, so it
        ;; can be handled specially by completion styles such as
        ;; partial-completion.
        ;; We used to remove `partial-completion' from completion-styles
        ;; instead, but it was too blunt, leading to situations where SPC
        ;; was the only insertable char at point but minibuffer-complete-word
        ;; refused inserting it.
        (let ((exts (mapcar (lambda (str) (propertize str 'completion-try-word t))
                            '(" " "-")))
              (before (substring string 0 point))
              (after (substring string point))
	      tem)
          ;; If both " " and "-" lead to completions, prefer " " so SPC behaves
          ;; a bit more like a self-inserting key (bug#17375).
	  (while (and exts (not (consp tem)))
            (setq tem (completion-try-completion
		       (concat before (pop exts) after)
		       table predicate (1+ point) md)))
	  (if (consp tem) (setq comp tem))))

      ;; Completing a single word is actually more difficult than completing
      ;; as much as possible, because we first have to find the "current
      ;; position" in `completion' in order to find the end of the word
      ;; we're completing.  Normally, `string' is a prefix of `completion',
      ;; which makes it trivial to find the position, but with fancier
      ;; completion (plus env-var expansion, ...) `completion' might not
      ;; look anything like `string' at all.
      (let* ((comppoint (cdr comp))
	     (completion (car comp))
	     (before (substring string 0 point))
	     (combined (concat before "\n" completion)))
        ;; Find in completion the longest text that was right before point.
        (when (string-match "\\(.+\\)\n.*?\\1" combined)
          (let* ((prefix (match-string 1 before))
                 ;; We used non-greedy match to make `rem' as long as possible.
                 (rem (substring combined (match-end 0)))
                 ;; Find in the remainder of completion the longest text
                 ;; that was right after point.
                 (after (substring string point))
                 (suffix (if (string-match "\\`\\(.+\\).*\n.*\\1"
                                           (concat after "\n" rem))
                             (match-string 1 after))))
            ;; The general idea is to try and guess what text was inserted
            ;; at point by the completion.  Problem is: if we guess wrong,
            ;; we may end up treating as "added by completion" text that was
            ;; actually painfully typed by the user.  So if we then cut
            ;; after the first word, we may throw away things the
            ;; user wrote.  So let's try to be as conservative as possible:
            ;; only cut after the first word, if we're reasonably sure that
            ;; our guess is correct.
            ;; Note: a quick survey on emacs-devel seemed to indicate that
            ;; nobody actually cares about the "word-at-a-time" feature of
            ;; minibuffer-complete-word, whose real raison-d'être is that it
            ;; tries to add "-" or " ".  One more reason to only cut after
            ;; the first word, if we're really sure we're right.
            (when (and (or suffix (zerop (length after)))
                       (string-match (concat
                                      ;; Make submatch 1 as small as possible
                                      ;; to reduce the risk of cutting
                                      ;; valuable text.
                                      ".*" (regexp-quote prefix) "\\(.*?\\)"
                                      (if suffix (regexp-quote suffix) "\\'"))
                                     completion)
                       ;; The new point in `completion' should also be just
                       ;; before the suffix, otherwise something more complex
                       ;; is going on, and we're not sure where we are.
                       (eq (match-end 1) comppoint)
                       ;; (match-beginning 1)..comppoint is now the stretch
                       ;; of text in `completion' that was completed at point.
		       (string-match "\\W" completion (match-beginning 1))
		       ;; Is there really something to cut?
		       (> comppoint (match-end 0)))
              ;; Cut after the first word.
              (let ((cutpos (match-end 0)))
                (setq completion (concat (substring completion 0 cutpos)
                                         (substring completion comppoint)))
                (setq comppoint cutpos)))))

	(cons completion comppoint)))))


(defun minibuffer-complete-word ()
  "Complete the minibuffer contents at most a single word.
After one word is completed as much as possible, a space or hyphen
is added, provided that matches some possible completion.
Return nil if there is no valid completion, else t."
  (interactive)
  (completion-in-region--single-word
   (minibuffer--completion-prompt-end) (point-max)))

(defun completion-in-region--single-word (beg end)
  (pcase (completion--do-completion beg end #'completion--try-word-completion)
    (#b000 nil)
    (_     t)))

(defface completions-annotations '((t :inherit (italic shadow)))
  "Face to use for annotations in the *Completions* buffer.")

(defcustom completions-format 'horizontal
  "Define the appearance and sorting of completions.
If the value is `vertical', display completions sorted vertically
in columns in the *Completions* buffer.
If the value is `horizontal', display completions sorted in columns
horizontally in alphabetical order, rather than down the screen.
If the value is `one-column', display completions down the screen
in one column."
  :type '(choice (const horizontal) (const vertical) (const one-column))
  :version "23.2")

(defcustom completions-detailed nil
  "When non-nil, display completions with details added as prefix/suffix.
Some commands might provide a detailed view with more information prepended
or appended to completions."
  :type 'boolean
  :version "28.1")

(defun completion--insert-strings (strings &optional group-fun)
  "Insert a list of STRINGS into the current buffer.
The candidate strings are inserted into the buffer depending on the
completions format as specified by the variable `completions-format'.
Runs of equal candidate strings are eliminated.  GROUP-FUN is a
`group-function' used for grouping the completion candidates."
  (when (consp strings)
    (let* ((length (apply #'max
			  (mapcar (lambda (s)
				    (if (consp s)
				        (apply #'+ (mapcar #'string-width s))
				      (string-width s)))
				  strings)))
	   (window (get-buffer-window (current-buffer) 0))
	   (wwidth (if window (1- (window-width window)) 79))
	   (columns (min
		     ;; At least 2 columns; at least 2 spaces between columns.
		     (max 2 (/ wwidth (+ 2 length)))
		     ;; Don't allocate more columns than we can fill.
		     ;; Windows can't show less than 3 lines anyway.
		     (max 1 (/ (length strings) 2))))
	   (colwidth (/ wwidth columns)))
      (unless (or tab-stop-list (null completion-tab-width)
                  (zerop (mod colwidth completion-tab-width)))
        ;; Align to tab positions for the case
        ;; when the caller uses tabs inside prefix.
        (setq colwidth (- colwidth (mod colwidth completion-tab-width))))
      (funcall (intern (format "completion--insert-%s" completions-format))
               strings group-fun length wwidth colwidth columns))))

(defun completion--insert-horizontal (strings group-fun
                                              length wwidth
                                              colwidth _columns)
  (let ((column 0)
        (first t)
	(last-title nil)
        (last-string nil))
    (dolist (str strings)
      (unless (equal last-string str) ; Remove (consecutive) duplicates.
	(setq last-string str)
        (when group-fun
          (let ((title (funcall group-fun (if (consp str) (car str) str) nil)))
            (unless (equal title last-title)
              (setq last-title title)
              (when title
                (insert (if first "" "\n") (format completions-group-format title) "\n")
                (setq column 0
                      first t)))))
	(unless first
          ;; FIXME: `string-width' doesn't pay attention to
          ;; `display' properties.
	  (if (< wwidth (+ column (max colwidth
                                       (if (consp str)
                                           (apply #'+ (mapcar #'string-width str))
                                         (string-width str)))))
	      ;; No space for `str' at point, move to next line.
	      (progn (insert "\n") (setq column 0))
	    (insert " \t")
	    ;; Leave the space unpropertized so that in the case we're
	    ;; already past the goal column, there is still
	    ;; a space displayed.
	    (set-text-properties (1- (point)) (point)
				 ;; We can set tab-width using
				 ;; completion-tab-width, but
				 ;; the caller can prefer using
				 ;; \t to align prefixes.
				 `(display (space :align-to ,column)))
	    nil))
        (setq first nil)
        (completion--insert str group-fun)
	;; Next column to align to.
	(setq column (+ column
			;; Round up to a whole number of columns.
			(* colwidth (ceiling length colwidth))))))))

(defun completion--insert-vertical (strings group-fun
                                            _length _wwidth
                                            colwidth columns)
  (while strings
    (let ((group nil)
          (column 0)
	  (row 0)
          (rows)
          (last-string nil))
      (if group-fun
          (let* ((str (car strings))
                 (title (funcall group-fun (if (consp str) (car str) str) nil)))
            (while (and strings
                        (equal title (funcall group-fun
                                              (if (consp (car strings))
                                                  (car (car strings))
                                                (car strings))
                                              nil)))
              (push (car strings) group)
              (pop strings))
            (setq group (nreverse group)))
        (setq group strings
              strings nil))
      (setq rows (/ (length group) columns))
      (when group-fun
        (let* ((str (car group))
               (title (funcall group-fun (if (consp str) (car str) str) nil)))
          (when title
            (goto-char (point-max))
            (insert (format completions-group-format title) "\n"))))
      (dolist (str group)
        (unless (equal last-string str) ; Remove (consecutive) duplicates.
	  (setq last-string str)
	  (when (> row rows)
            (forward-line (- -1 rows))
	    (setq row 0 column (+ column colwidth)))
	  (when (> column 0)
	    (end-of-line)
	    (while (> (current-column) column)
	      (if (eobp)
		  (insert "\n")
	        (forward-line 1)
	        (end-of-line)))
	    (insert " \t")
	    (set-text-properties (1- (point)) (point)
			         `(display (space :align-to ,column))))
          (completion--insert str group-fun)
	  (if (> column 0)
	      (forward-line)
	    (insert "\n"))
	  (setq row (1+ row)))))))

(defun completion--insert-one-column (strings group-fun &rest _)
  (let ((last-title nil) (last-string nil))
    (dolist (str strings)
      (unless (equal last-string str) ; Remove (consecutive) duplicates.
	(setq last-string str)
        (when group-fun
          (let ((title (funcall group-fun (if (consp str) (car str) str) nil)))
            (unless (equal title last-title)
              (setq last-title title)
              (when title
                (insert (format completions-group-format title) "\n")))))
        (completion--insert str group-fun)
        (insert "\n")))))

(defun completion--insert (str group-fun)
  (if (not (consp str))
      (add-text-properties
       (point)
       (progn
         (insert
          (if group-fun
              (funcall group-fun str 'transform)
            str))
         (point))
       `(mouse-face highlight completion--string ,str))
    ;; If `str' is a list that has 2 elements,
    ;; then the second element is a suffix annotation.
    ;; If `str' has 3 elements, then the second element
    ;; is a prefix, and the third element is a suffix.
    (let* ((prefix (when (nth 2 str) (nth 1 str)))
           (suffix (or (nth 2 str) (nth 1 str))))
      (when prefix
        (let ((beg (point))
              (end (progn (insert prefix) (point))))
          (put-text-property beg end 'mouse-face nil)))
      (completion--insert (car str) group-fun)
      (let ((beg (point))
            (end (progn (insert suffix) (point))))
        (put-text-property beg end 'mouse-face nil)
        ;; Put the predefined face only when suffix
        ;; is added via annotation-function without prefix,
        ;; and when the caller doesn't use own face.
        (unless (or prefix (text-property-not-all
                            0 (length suffix) 'face nil suffix))
          (font-lock-prepend-text-property
           beg end 'face 'completions-annotations))))))

(defvar completion-setup-hook nil
  "Normal hook run at the end of setting up a completion list buffer.
When this hook is run, the current buffer is the one in which the
command to display the completion list buffer was run.
The completion list buffer is available as the value of `standard-output'.
See also `display-completion-list'.")

(defface completions-first-difference
  '((t (:inherit bold)))
  "Face for the first character after point in completions.
See also the face `completions-common-part'.")

(defface completions-common-part
  '((((class color) (min-colors 16) (background light)) :foreground "blue3")
    (((class color) (min-colors 16) (background dark)) :foreground "lightblue"))
  "Face for the parts of completions which matched the pattern.
See also the face `completions-first-difference'.")

(defun completion-hilit-commonality (completions prefix-len &optional base-size)
  "Apply font-lock highlighting to a list of completions, COMPLETIONS.
PREFIX-LEN is an integer.  BASE-SIZE is an integer or nil (meaning zero).

This adds the face `completions-common-part' to the first
\(PREFIX-LEN - BASE-SIZE) characters of each completion, and the face
`completions-first-difference' to the first character after that.

It returns a list with font-lock properties applied to each element,
and with BASE-SIZE appended as the last element."
  (when completions
    (let ((com-str-len (- prefix-len (or base-size 0))))
      (nconc
       (mapcar
        (lambda (elem)
          (let ((str
                 ;; Don't modify the string itself, but a copy, since the
                 ;; the string may be read-only or used for other purposes.
                 ;; Furthermore, since `completions' may come from
                 ;; display-completion-list, `elem' may be a list.
                 (if (consp elem)
                     (car (setq elem (cons (copy-sequence (car elem))
                                           (cdr elem))))
                   (setq elem (copy-sequence elem)))))
            (font-lock-prepend-text-property
             0
             ;; If completion-boundaries returns incorrect
             ;; values, all-completions may return strings
             ;; that don't contain the prefix.
             (min com-str-len (length str))
             'face 'completions-common-part str)
            (if (> (length str) com-str-len)
                (font-lock-prepend-text-property com-str-len (1+ com-str-len)
                                                 'face
                                                 'completions-first-difference
                                                 str)))
          elem)
        completions)
       base-size))))

(defun display-completion-list (completions &optional common-substring group-fun)
  "Display the list of completions, COMPLETIONS, using `standard-output'.
Each element may be just a symbol or string
or may be a list of two strings to be printed as if concatenated.
If it is a list of two strings, the first is the actual completion
alternative, the second serves as annotation.
`standard-output' must be a buffer.
The actual completion alternatives, as inserted, are given `mouse-face'
properties of `highlight'.
At the end, this runs the normal hook `completion-setup-hook'.
It can find the completion buffer in `standard-output'.
GROUP-FUN is a `group-function' used for grouping the completion
candidates."
  (declare (advertised-calling-convention (completions) "24.4"))
  (if common-substring
      (setq completions (completion-hilit-commonality
                         completions (length common-substring)
                         ;; We don't know the base-size.
                         nil)))
  (if (not (bufferp standard-output))
      ;; This *never* (ever) happens, so there's no point trying to be clever.
      (with-temp-buffer
	(let ((standard-output (current-buffer))
	      (completion-setup-hook nil))
          (with-suppressed-warnings ((callargs display-completion-list))
	    (display-completion-list completions common-substring group-fun)))
	(princ (buffer-string)))

    (with-current-buffer standard-output
      (goto-char (point-max))
      (if (null completions)
          (insert "There are no possible completions of what you have typed.")
        (insert "Possible completions are:\n")
        (completion--insert-strings completions group-fun))))

  (run-hooks 'completion-setup-hook)
  nil)

(defvar completion-extra-properties nil
  "Property list of extra properties of the current completion job.
These include:

`:annotation-function': Function to annotate the completions buffer.
   The function must accept one argument, a completion string,
   and return either nil or a string which is to be displayed
   next to the completion (but which is not part of the
   completion).  The function can access the completion data via
   `minibuffer-completion-table' and related variables.

`:affixation-function': Function to prepend/append a prefix/suffix to
   completions.  The function must accept one argument, a list of
   completions, and return a list of annotated completions.  The
   elements of the list must be three-element lists: completion, its
   prefix and suffix.  This function takes priority over
   `:annotation-function' when both are provided, so only this
   function is used.

`:exit-function': Function to run after completion is performed.

   The function must accept two arguments, STRING and STATUS.
   STRING is the text to which the field was completed, and
   STATUS indicates what kind of operation happened:
     `finished' - text is now complete
     `sole'     - text cannot be further completed but
                  completion is not finished
     `exact'    - text is a valid completion but may be further
                  completed.")

(defvar completion-annotate-function
  nil
  ;; Note: there's a lot of scope as for when to add annotations and
  ;; what annotations to add.  E.g. completing-help.el allowed adding
  ;; the first line of docstrings to M-x completion.  But there's
  ;; a tension, since such annotations, while useful at times, can
  ;; actually drown the useful information.
  ;; So completion-annotate-function should be used parsimoniously, or
  ;; else only used upon a user's request (e.g. we could add a command
  ;; to completion-list-mode to add annotations to the current
  ;; completions).
  "Function to add annotations in the *Completions* buffer.
The function takes a completion and should either return nil, or a string that
will be displayed next to the completion.  The function can access the
completion table and predicates via `minibuffer-completion-table' and related
variables.")
(make-obsolete-variable 'completion-annotate-function
                        'completion-extra-properties "24.1")

(defun completion--done (string &optional finished message)
  (let* ((exit-fun (plist-get completion-extra-properties :exit-function))
         (pre-msg (and exit-fun (current-message))))
    (cl-assert (memq finished '(exact sole finished unknown)))
    (when exit-fun
      (when (eq finished 'unknown)
        (setq finished
              (if (eq (try-completion string
                                      minibuffer-completion-table
                                      minibuffer-completion-predicate)
                      t)
                  'finished 'exact)))
      (funcall exit-fun string finished))
    (when (and message
               ;; Don't output any message if the exit-fun already did so.
               (equal pre-msg (and exit-fun (current-message))))
      (completion--message message))))

(defun minibuffer-completion-help (&optional start end)
  "Display a list of possible completions of the current minibuffer contents."
  (interactive)
  (message "Making completion list...")
  (let* ((start (or start (minibuffer--completion-prompt-end)))
         (end (or end (point-max)))
         (string (buffer-substring start end))
         (md (completion--field-metadata start))
         (completions (completion-all-completions
                       string
                       minibuffer-completion-table
                       minibuffer-completion-predicate
                       (- (point) start)
                       md)))
    (message nil)
    (if (or (null completions)
            (and (not (consp (cdr completions)))
                 (equal (car completions) string)))
        (progn
          ;; If there are no completions, or if the current input is already
          ;; the sole completion, then hide (previous&stale) completions.
          (minibuffer-hide-completions)
          (ding)
          (completion--message
           (if completions "Sole completion" "No completions")))

      (let* ((last (last completions))
             (base-size (or (cdr last) 0))
             (prefix (unless (zerop base-size) (substring string 0 base-size)))
             (all-md (completion--metadata (buffer-substring-no-properties
                                            start (point))
                                           base-size md
                                           minibuffer-completion-table
                                           minibuffer-completion-predicate))
             (ann-fun (or (completion-metadata-get all-md 'annotation-function)
                          (plist-get completion-extra-properties
                                     :annotation-function)
                          completion-annotate-function))
             (aff-fun (or (completion-metadata-get all-md 'affixation-function)
                          (plist-get completion-extra-properties
                                     :affixation-function)))
             (sort-fun (completion-metadata-get all-md 'display-sort-function))
             (group-fun (completion-metadata-get all-md 'group-function))
             (mainbuf (current-buffer))
             ;; If the *Completions* buffer is shown in a new
             ;; window, mark it as softly-dedicated, so bury-buffer in
             ;; minibuffer-hide-completions will know whether to
             ;; delete the window or not.
             (display-buffer-mark-dedicated 'soft))
        (with-current-buffer-window
          "*Completions*"
          ;; This is a copy of `display-buffer-fallback-action'
          ;; where `display-buffer-use-some-window' is replaced
          ;; with `display-buffer-at-bottom'.
          `((display-buffer--maybe-same-window
             display-buffer-reuse-window
             display-buffer--maybe-pop-up-frame
             ;; Use `display-buffer-below-selected' for inline completions,
             ;; but not in the minibuffer (e.g. in `eval-expression')
             ;; for which `display-buffer-at-bottom' is used.
             ,(if (eq (selected-window) (minibuffer-window))
                  'display-buffer-at-bottom
                'display-buffer-below-selected))
            ,(if temp-buffer-resize-mode
                 '(window-height . resize-temp-buffer-window)
               '(window-height . fit-window-to-buffer))
            ,(when temp-buffer-resize-mode
               '(preserve-size . (nil . t)))
            (body-function
             . ,#'(lambda (_window)
                    (with-current-buffer mainbuf
                      ;; Remove the base-size tail because `sort' requires a properly
                      ;; nil-terminated list.
                      (when last (setcdr last nil))

                      ;; Sort first using the `display-sort-function'.
                      ;; FIXME: This function is for the output of
                      ;; all-completions, not
                      ;; completion-all-completions.  Often it's the
                      ;; same, but not always.
                      (setq completions (if sort-fun
                                            (funcall sort-fun completions)
                                          (sort completions 'string-lessp)))

                      ;; After sorting, group the candidates using the
                      ;; `group-function'.
                      (when group-fun
                        (setq completions
                              (minibuffer--group-by
                               group-fun
                               (pcase completions-group-sort
                                 ('nil #'identity)
                                 ('alphabetical
                                  (lambda (groups)
                                    (sort groups
                                          (lambda (x y)
                                            (string< (car x) (car y))))))
                                 (_ completions-group-sort))
                               completions)))

                      (cond
                       (aff-fun
                        (setq completions
                              (funcall aff-fun completions)))
                       (ann-fun
                        (setq completions
                              (mapcar (lambda (s)
                                        (let ((ann (funcall ann-fun s)))
                                          (if ann (list s ann) s)))
                                      completions))))

                      (with-current-buffer standard-output
                        (setq-local completion-base-position
                             (list (+ start base-size)
                                   ;; FIXME: We should pay attention to completion
                                   ;; boundaries here, but currently
                                   ;; completion-all-completions does not give us the
                                   ;; necessary information.
                                   end))
                        (setq-local completion-list-insert-choice-function
                             (let ((ctable minibuffer-completion-table)
                                   (cpred minibuffer-completion-predicate)
                                   (cprops completion-extra-properties))
                               (lambda (start end choice)
                                 (unless (or (zerop (length prefix))
                                             (equal prefix
                                                    (buffer-substring-no-properties
                                                     (max (point-min)
                                                          (- start (length prefix)))
                                                     start)))
                                   (message "*Completions* out of date"))
                                 ;; FIXME: Use `md' to do quoting&terminator here.
                                 (completion--replace start end choice)
                                 (let* ((minibuffer-completion-table ctable)
                                        (minibuffer-completion-predicate cpred)
                                        (completion-extra-properties cprops)
                                        (result (concat prefix choice))
                                        (bounds (completion-boundaries
                                                 result ctable cpred "")))
                                   ;; If the completion introduces a new field, then
                                   ;; completion is not finished.
                                   (completion--done result
                                                     (if (eq (car bounds) (length result))
                                                         'exact 'finished)))))))

                      (display-completion-list completions nil group-fun)))))
          nil)))
    nil))

(defun minibuffer-hide-completions ()
  "Get rid of an out-of-date *Completions* buffer."
  ;; FIXME: We could/should use minibuffer-scroll-window here, but it
  ;; can also point to the minibuffer-parent-window, so it's a bit tricky.
  (let ((win (get-buffer-window "*Completions*" 0)))
    (if win (with-selected-window win (bury-buffer)))))

(defun exit-minibuffer ()
  "Terminate this minibuffer argument."
  (interactive)
  (when (minibufferp)
    (when (not (minibuffer-innermost-command-loop-p))
      (error "%s" "Not in most nested command loop"))
    (when (not (innermost-minibuffer-p))
      (error "%s" "Not in most nested minibuffer")))
  ;; If the command that uses this has made modifications in the minibuffer,
  ;; we don't want them to cause deactivation of the mark in the original
  ;; buffer.
  ;; A better solution would be to make deactivate-mark buffer-local
  ;; (or to turn it into a list of buffers, ...), but in the mean time,
  ;; this should do the trick in most cases.
  (setq deactivate-mark nil)
  (throw 'exit nil))

(defun minibuffer-restore-windows ()
  "Restore some windows on exit from minibuffer.
When `read-minibuffer-restore-windows' is nil, then this function
added to `minibuffer-exit-hook' will remove at least the window
that displays the \"*Completions*\" buffer."
  (unless read-minibuffer-restore-windows
    (minibuffer-hide-completions)))

(add-hook 'minibuffer-exit-hook 'minibuffer-restore-windows)

(defun minibuffer-quit-recursive-edit ()
  "Quit the command that requested this recursive edit without error.
Like `abort-recursive-edit' without aborting keyboard macro
execution."
  ;; See Info node `(elisp)Recursive Editing' for an explanation of
  ;; throwing a function to `exit'.
  (throw 'exit (lambda ()
                 (signal 'minibuffer-quit nil))))

(defun self-insert-and-exit ()
  "Terminate minibuffer input."
  (interactive)
  (if (characterp last-command-event)
      (call-interactively 'self-insert-command)
    (ding))
  (exit-minibuffer))

(defvar completion-in-region-functions nil
  "Wrapper hook around `completion--in-region'.
\(See `with-wrapper-hook' for details about wrapper hooks.)")
(make-obsolete-variable 'completion-in-region-functions
                        'completion-in-region-function "24.4")

(defvar completion-in-region-function #'completion--in-region
  "Function to perform the job of `completion-in-region'.
The function is called with 4 arguments: START END COLLECTION PREDICATE.
The arguments and expected return value are as specified for
`completion-in-region'.")

(defvar completion-in-region--data nil)

(defvar completion-in-region-mode-predicate nil
  "Predicate to tell `completion-in-region-mode' when to exit.
It is called with no argument and should return nil when
`completion-in-region-mode' should exit (and hence pop down
the *Completions* buffer).")

(defvar completion-in-region-mode--predicate nil
  "Copy of the value of `completion-in-region-mode-predicate'.
This holds the value `completion-in-region-mode-predicate' had when
we entered `completion-in-region-mode'.")

(defun completion-in-region (start end collection &optional predicate)
  "Complete the text between START and END using COLLECTION.
Point needs to be somewhere between START and END.
PREDICATE (a function called with no arguments) says when to exit.
This calls the function that `completion-in-region-function' specifies
\(passing the same four arguments that it received) to do the work,
and returns whatever it does.  The return value should be nil
if there was no valid completion, else t."
  (cl-assert (<= start (point)) (<= (point) end))
  (funcall completion-in-region-function start end collection predicate))

(defcustom read-file-name-completion-ignore-case
  (if (memq system-type '(ms-dos windows-nt darwin cygwin))
      t nil)
  "Non-nil means when reading a file name completion ignores case."
  :type 'boolean
  :version "22.1")

(defun completion--in-region (start end collection &optional predicate)
  "Default function to use for `completion-in-region-function'.
Its arguments and return value are as specified for `completion-in-region'.
Also respects the obsolete wrapper hook `completion-in-region-functions'.
\(See `with-wrapper-hook' for details about wrapper hooks.)"
  (subr--with-wrapper-hook-no-warnings
      ;; FIXME: Maybe we should use this hook to provide a "display
      ;; completions" operation as well.
      completion-in-region-functions (start end collection predicate)
    (let ((minibuffer-completion-table collection)
          (minibuffer-completion-predicate predicate))
      ;; HACK: if the text we are completing is already in a field, we
      ;; want the completion field to take priority (e.g. Bug#6830).
      (when completion-in-region-mode-predicate
        (setq completion-in-region--data
	      `(,(if (markerp start) start (copy-marker start))
                ,(copy-marker end t) ,collection ,predicate))
        (completion-in-region-mode 1))
      (completion--in-region-1 start end))))

(defvar completion-in-region-mode-map
  (let ((map (make-sparse-keymap)))
    ;; FIXME: Only works if completion-in-region-mode was activated via
    ;; completion-at-point called directly.
    (define-key map "\M-?" 'completion-help-at-point)
    (define-key map "\t" 'completion-at-point)
    map)
  "Keymap activated during `completion-in-region'.")

;; It is difficult to know when to exit completion-in-region-mode (i.e. hide
;; the *Completions*).  Here's how previous packages did it:
;; - lisp-mode: never.
;; - comint: only do it if you hit SPC at the right time.
;; - pcomplete: pop it down on SPC or after some time-delay.
;; - semantic: use a post-command-hook check similar to this one.
(defun completion-in-region--postch ()
  (or unread-command-events ;Don't pop down the completions in the middle of
                            ;mouse-drag-region/mouse-set-point.
      (and completion-in-region--data
           (and (eq (marker-buffer (nth 0 completion-in-region--data))
                    (current-buffer))
                (>= (point) (nth 0 completion-in-region--data))
                (<= (point)
                    (save-excursion
                      (goto-char (nth 1 completion-in-region--data))
                      (line-end-position)))
		(funcall completion-in-region-mode--predicate)))
      (completion-in-region-mode -1)))

;; (defalias 'completion-in-region--prech 'completion-in-region--postch)

(defvar completion-in-region-mode nil)  ;Explicit defvar, i.s.o defcustom.

(define-minor-mode completion-in-region-mode
  "Transient minor mode used during `completion-in-region'."
  :global t
  :group 'minibuffer
  ;; Prevent definition of a custom-variable since it makes no sense to
  ;; customize this variable.
  :variable completion-in-region-mode
  ;; (remove-hook 'pre-command-hook #'completion-in-region--prech)
  (remove-hook 'post-command-hook #'completion-in-region--postch)
  (setq minor-mode-overriding-map-alist
        (delq (assq 'completion-in-region-mode minor-mode-overriding-map-alist)
              minor-mode-overriding-map-alist))
  (if (null completion-in-region-mode)
      (progn
        (setq completion-in-region--data nil)
        (unless (equal "*Completions*" (buffer-name (window-buffer)))
          (minibuffer-hide-completions)))
    ;; (add-hook 'pre-command-hook #'completion-in-region--prech)
    (cl-assert completion-in-region-mode-predicate)
    (setq completion-in-region-mode--predicate
	  completion-in-region-mode-predicate)
    (add-hook 'post-command-hook #'completion-in-region--postch)
    (push `(completion-in-region-mode . ,completion-in-region-mode-map)
          minor-mode-overriding-map-alist)))

;; Define-minor-mode added our keymap to minor-mode-map-alist, but we want it
;; on minor-mode-overriding-map-alist instead.
(setq minor-mode-map-alist
      (delq (assq 'completion-in-region-mode minor-mode-map-alist)
            minor-mode-map-alist))

(defvar completion-at-point-functions '(tags-completion-at-point-function)
  "Special hook to find the completion table for the entity at point.
Each function on this hook is called in turn without any argument and
should return either nil, meaning it is not applicable at point,
or a function of no arguments to perform completion (discouraged),
or a list of the form (START END COLLECTION . PROPS), where:
 START and END delimit the entity to complete and should include point,
 COLLECTION is the completion table to use to complete the entity, and
 PROPS is a property list for additional information.
Currently supported properties are all the properties that can appear in
`completion-extra-properties' plus:
 `:predicate'	a predicate that completion candidates need to satisfy.
 `:exclusive'	value of `no' means that if the completion table fails to
   match the text at point, then instead of reporting a completion
   failure, the completion should try the next completion function.
As is the case with most hooks, the functions are responsible for
preserving things like point and current buffer.

NOTE: These functions should be cheap to run since they're sometimes
run from `post-command-hook'; and they should ideally only choose
which kind of completion table to use, and not pre-filter it based
on the current text between START and END (e.g., they should not
obey `completion-styles').")

(defvar completion--capf-misbehave-funs nil
  "List of functions found on `completion-at-point-functions' that misbehave.
These are functions that neither return completion data nor a completion
function but instead perform completion right away.")
(defvar completion--capf-safe-funs nil
  "List of well-behaved functions found on `completion-at-point-functions'.
These are functions which return proper completion data rather than
a completion function or god knows what else.")

(defun completion--capf-wrapper (fun which)
  ;; FIXME: The safe/misbehave handling assumes that a given function will
  ;; always return the same kind of data, but this breaks down with functions
  ;; like comint-completion-at-point or mh-letter-completion-at-point, which
  ;; could be sometimes safe and sometimes misbehaving (and sometimes neither).
  (if (pcase which
        ('all t)
        ('safe (member fun completion--capf-safe-funs))
        ('optimist (not (member fun completion--capf-misbehave-funs))))
      (let ((res (funcall fun)))
        (cond
         ((and (consp res) (not (functionp res)))
          (unless (member fun completion--capf-safe-funs)
            (push fun completion--capf-safe-funs))
          (and (eq 'no (plist-get (nthcdr 3 res) :exclusive))
               ;; FIXME: Here we'd need to decide whether there are
               ;; valid completions against the current text.  But this depends
               ;; on the actual completion UI (e.g. with the default completion
               ;; it depends on completion-style) ;-(
               ;; We approximate this result by checking whether prefix
               ;; completion might work, which means that non-prefix completion
               ;; will not work (or not right) for completion functions that
               ;; are non-exclusive.
               (null (try-completion (buffer-substring-no-properties
                                      (car res) (point))
                                     (nth 2 res)
                                     (plist-get (nthcdr 3 res) :predicate)))
               (setq res nil)))
         ((not (or (listp res) (functionp res)))
          (unless (member fun completion--capf-misbehave-funs)
            (message
             "Completion function %S uses a deprecated calling convention" fun)
            (push fun completion--capf-misbehave-funs))))
        (if res (cons fun res)))))

(defun completion-at-point ()
  "Perform completion on the text around point.
The completion method is determined by `completion-at-point-functions'."
  (interactive)
  (let ((res (run-hook-wrapped 'completion-at-point-functions
                               #'completion--capf-wrapper 'all)))
    (pcase res
      (`(,_ . ,(and (pred functionp) f)) (funcall f))
      (`(,hookfun . (,start ,end ,collection . ,plist))
       (unless (markerp start) (setq start (copy-marker start)))
       (let* ((completion-extra-properties plist)
              (completion-in-region-mode-predicate
               (lambda ()
                 ;; We're still in the same completion field.
                 (let ((newstart (car-safe (funcall hookfun))))
                   (and newstart (= newstart start))))))
         (completion-in-region start end collection
                               (plist-get plist :predicate))))
      ;; Maybe completion already happened and the function returned t.
      (_
       (when (cdr res)
         (message "Warning: %S failed to return valid completion data!"
                  (car res)))
       (cdr res)))))

(defun completion-help-at-point ()
  "Display the completions on the text around point.
The completion method is determined by `completion-at-point-functions'."
  (interactive)
  (let ((res (run-hook-wrapped 'completion-at-point-functions
                               ;; Ignore misbehaving functions.
                               #'completion--capf-wrapper 'optimist)))
    (pcase res
      (`(,_ . ,(and (pred functionp) f))
       (message "Don't know how to show completions for %S" f))
      (`(,hookfun . (,start ,end ,collection . ,plist))
       (unless (markerp start) (setq start (copy-marker start)))
       (let* ((minibuffer-completion-table collection)
              (minibuffer-completion-predicate (plist-get plist :predicate))
              (completion-extra-properties plist)
              (completion-in-region-mode-predicate
               (lambda ()
                 ;; We're still in the same completion field.
                 (let ((newstart (car-safe (funcall hookfun))))
                   (and newstart (= newstart start))))))
         ;; FIXME: We should somehow (ab)use completion-in-region-function or
         ;; introduce a corresponding hook (plus another for word-completion,
         ;; and another for force-completion, maybe?).
         (setq completion-in-region--data
               `(,start ,(copy-marker end t) ,collection
                        ,(plist-get plist :predicate)))
         (completion-in-region-mode 1)
         (minibuffer-completion-help start end)))
      (`(,hookfun . ,_)
       ;; The hook function already performed completion :-(
       ;; Not much we can do at this point.
       (message "%s already performed completion!" hookfun)
       nil)
      (_ (message "Nothing to complete at point")))))

;;; Key bindings.

(let ((map minibuffer-local-map))
  (define-key map "\C-g" 'abort-minibuffers)
  (define-key map "\M-<" 'minibuffer-beginning-of-buffer)

  ;; Put RET last so that it is shown in doc strings in preference to
  ;; C-j, when using the \\[exit-minibuffer] notation.
  (define-key map "\n" 'exit-minibuffer)
  (define-key map "\r" 'exit-minibuffer))

(defvar minibuffer-local-completion-map
  (let ((map (make-sparse-keymap)))
    (set-keymap-parent map minibuffer-local-map)
    (define-key map "\t" 'minibuffer-complete)
    ;; M-TAB is already abused for many other purposes, so we should find
    ;; another binding for it.
    ;; (define-key map "\e\t" 'minibuffer-force-complete)
    (define-key map " " 'minibuffer-complete-word)
    (define-key map "?" 'minibuffer-completion-help)
    (define-key map [prior] 'switch-to-completions)
    (define-key map "\M-v"  'switch-to-completions)
    (define-key map "\M-g\M-c"  'switch-to-completions)
    map)
  "Local keymap for minibuffer input with completion.")

(defvar minibuffer-local-must-match-map
  (let ((map (make-sparse-keymap)))
    (set-keymap-parent map minibuffer-local-completion-map)
    (define-key map "\r" 'minibuffer-complete-and-exit)
    (define-key map "\n" 'minibuffer-complete-and-exit)
    map)
  "Local keymap for minibuffer input with completion, for exact match.")

(defvar minibuffer-local-filename-completion-map
  (let ((map (make-sparse-keymap)))
    (define-key map " " nil)
    map)
  "Local keymap for minibuffer input with completion for filenames.
Gets combined either with `minibuffer-local-completion-map' or
with `minibuffer-local-must-match-map'.")

(defvar minibuffer-local-filename-must-match-map (make-sparse-keymap))
(make-obsolete-variable 'minibuffer-local-filename-must-match-map nil "24.1")

(defvar minibuffer-local-ns-map
  (let ((map (make-sparse-keymap)))
    (set-keymap-parent map minibuffer-local-map)
    (define-key map " "  #'exit-minibuffer)
    (define-key map "\t" #'exit-minibuffer)
    (define-key map "?"  #'self-insert-and-exit)
    map)
  "Local keymap for the minibuffer when spaces are not allowed.")

(defun read-no-blanks-input (prompt &optional initial inherit-input-method)
  "Read a string from the terminal, not allowing blanks.
Prompt with PROMPT.  Whitespace terminates the input.  If INITIAL is
non-nil, it should be a string, which is used as initial input, with
point positioned at the end, so that SPACE will accept the input.
\(Actually, INITIAL can also be a cons of a string and an integer.
Such values are treated as in `read-from-minibuffer', but are normally
not useful in this function.)

Third arg INHERIT-INPUT-METHOD, if non-nil, means the minibuffer inherits
the current input method and the setting of`enable-multibyte-characters'.

If `inhibit-interaction' is non-nil, this function will signal an
`inhibited-interaction' error."
  (read-from-minibuffer prompt initial minibuffer-local-ns-map
		        nil minibuffer-history nil inherit-input-method))

;;; Major modes for the minibuffer

(defvar minibuffer-inactive-mode-map
  (let ((map (make-keymap)))
    (suppress-keymap map)
    (define-key map "e" 'find-file-other-frame)
    (define-key map "f" 'find-file-other-frame)
    (define-key map "b" 'switch-to-buffer-other-frame)
    (define-key map "i" 'info)
    (define-key map "m" 'mail)
    (define-key map "n" 'make-frame)
    (define-key map [mouse-1] 'view-echo-area-messages)
    ;; So the global down-mouse-1 binding doesn't clutter the execution of the
    ;; above mouse-1 binding.
    (define-key map [down-mouse-1] #'ignore)
    map)
  "Keymap for use in the minibuffer when it is not active.
The non-mouse bindings in this keymap can only be used in minibuffer-only
frames, since the minibuffer can normally not be selected when it is
not active.")

(define-derived-mode minibuffer-inactive-mode nil "InactiveMinibuffer"
  :abbrev-table nil          ;abbrev.el is not loaded yet during dump.
  ;; Note: this major mode is called from minibuf.c.
  "Major mode to use in the minibuffer when it is not active.
This is only used when the minibuffer area has no active minibuffer.")

(defvaralias 'minibuffer-mode-map 'minibuffer-local-map)

(define-derived-mode minibuffer-mode nil "Minibuffer"
  "Major mode used for active minibuffers.

For customizing this mode, it is better to use
`minibuffer-setup-hook' and `minibuffer-exit-hook' rather than
the mode hook of this mode."
  :syntax-table nil
  :abbrev-table nil
  :interactive nil)

;;; Completion tables.

(defun minibuffer--double-dollars (str)
  ;; Reuse the actual "$" from the string to preserve any text-property it
  ;; might have, such as `face'.
  (replace-regexp-in-string "\\$" (lambda (dollar) (concat dollar dollar))
                            str))

(defun minibuffer-maybe-quote-filename (filename)
  "Protect FILENAME from `substitute-in-file-name', as needed.
Useful to give the user default values that won't be substituted."
  (if (and (not (file-name-quoted-p filename))
           (file-name-absolute-p filename)
           (string-match-p (if (memq system-type '(windows-nt ms-dos))
                               "[/\\]~" "/~")
                           (file-local-name filename)))
      (file-name-quote filename)
    (minibuffer--double-dollars filename)))

(defun completion--make-envvar-table ()
  (mapcar (lambda (enventry)
            (substring enventry 0 (string-search "=" enventry)))
          process-environment))

(defconst completion--embedded-envvar-re
  ;; We can't reuse env--substitute-vars-regexp because we need to match only
  ;; potentially-unfinished envvars at end of string.
  (concat "\\(?:^\\|[^$]\\(?:\\$\\$\\)*\\)"
          "\\$\\([[:alnum:]_]*\\|{\\([^}]*\\)\\)\\'"))

(defun completion--embedded-envvar-table (string _pred action)
  "Completion table for envvars embedded in a string.
The envvar syntax (and escaping) rules followed by this table are the
same as `substitute-in-file-name'."
  ;; We ignore `pred', because the predicates passed to us via
  ;; read-file-name-internal are not 100% correct and fail here:
  ;; e.g. we get predicates like file-directory-p there, whereas the filename
  ;; completed needs to be passed through substitute-in-file-name before it
  ;; can be passed to file-directory-p.
  (when (string-match completion--embedded-envvar-re string)
    (let* ((beg (or (match-beginning 2) (match-beginning 1)))
           (table (completion--make-envvar-table))
           (prefix (substring string 0 beg)))
      (cond
       ((eq action 'lambda)
        ;; This table is expected to be used in conjunction with some
        ;; other table that provides the "main" completion.  Let the
        ;; other table handle the test-completion case.
        nil)
       ((or (eq (car-safe action) 'boundaries) (eq action 'metadata))
        ;; Only return boundaries/metadata if there's something to complete,
        ;; since otherwise when we're used in
        ;; completion-table-in-turn, we could return boundaries and
        ;; let some subsequent table return a list of completions.
        ;; FIXME: Maybe it should rather be fixed in
        ;; completion-table-in-turn instead, but it's difficult to
        ;; do it efficiently there.
        (when (try-completion (substring string beg) table nil)
          ;; Compute the boundaries of the subfield to which this
          ;; completion applies.
          (if (eq action 'metadata)
              '(metadata (category . environment-variable))
            (let ((suffix (cdr action)))
              `(boundaries
                ,(or (match-beginning 2) (match-beginning 1))
                . ,(when (string-match "[^[:alnum:]_]" suffix)
                     (match-beginning 0)))))))
       (t
        (if (eq (aref string (1- beg)) ?{)
            (setq table (apply-partially #'completion-table-with-terminator
                                         "}" table)))
        ;; Even if file-name completion is case-insensitive, we want
        ;; envvar completion to be case-sensitive.
        (let ((completion-ignore-case nil))
          (completion-table-with-context
           prefix table (substring string beg) nil action)))))))

(defun completion-file-name-table (string pred action)
  "Completion table for file names."
  (condition-case nil
      (cond
       ((eq action 'metadata) '(metadata (category . file)))
       ((string-match-p "\\`~[^/\\]*\\'" string)
        (completion-table-with-context "~"
                                       (mapcar (lambda (u) (concat u "/"))
                                               (system-users))
                                       (substring string 1)
                                       pred action))
       ((eq (car-safe action) 'boundaries)
        (let ((start (length (file-name-directory string)))
              (end (string-search "/" (cdr action))))
          `(boundaries
            ;; if `string' is "C:" in w32, (file-name-directory string)
            ;; returns "C:/", so `start' is 3 rather than 2.
            ;; Not quite sure what is The Right Fix, but clipping it
            ;; back to 2 will work for this particular case.  We'll
            ;; see if we can come up with a better fix when we bump
            ;; into more such problematic cases.
            ,(min start (length string)) . ,end)))

       ((eq action 'lambda)
        (if (zerop (length string))
            nil          ;Not sure why it's here, but it probably doesn't harm.
          (funcall (or pred 'file-exists-p) string)))

       (t
        (let* ((name (file-name-nondirectory string))
               (specdir (file-name-directory string))
               (realdir (or specdir default-directory)))

          (cond
           ((null action)
            (let ((comp (file-name-completion name realdir pred)))
              (if (stringp comp)
                  (concat specdir comp)
                comp)))

           ((eq action t)
            (let ((all (file-name-all-completions name realdir)))

              ;; Check the predicate, if necessary.
              (unless (memq pred '(nil file-exists-p))
                (let ((comp ())
                      (pred
                       (if (eq pred 'file-directory-p)
                           ;; Brute-force speed up for directory checking:
                           ;; Discard strings which don't end in a slash.
                           (lambda (s)
                             (let ((len (length s)))
                               (and (> len 0) (eq (aref s (1- len)) ?/))))
                         ;; Must do it the hard (and slow) way.
                         pred)))
                  (let ((default-directory (expand-file-name realdir)))
                    (dolist (tem all)
                      (if (funcall pred tem) (push tem comp))))
                  (setq all (nreverse comp))))

              all))))))
    (file-error nil)))               ;PCM often calls with invalid directories.

(defun completion--sifn-requote (upos qstr)
  ;; We're looking for `qpos' such that:
  ;; (equal (substring (substitute-in-file-name qstr) 0 upos)
  ;;        (substitute-in-file-name (substring qstr 0 qpos)))
  ;; Big problem here: we have to reverse engineer substitute-in-file-name to
  ;; find the position corresponding to UPOS in QSTR, but
  ;; substitute-in-file-name can do anything, depending on file-name-handlers.
  ;; substitute-in-file-name does the following kind of things:
  ;; - expand env-var references.
  ;; - turn backslashes into slashes.
  ;; - truncate some prefix of the input.
  ;; - rewrite some prefix.
  ;; Some of these operations are written in external libraries and we'd rather
  ;; not hard code any assumptions here about what they actually do.  IOW, we
  ;; want to treat substitute-in-file-name as a black box, as much as possible.
  ;; Kind of like in rfn-eshadow-update-overlay, only worse.
  ;; Example of things we need to handle:
  ;; - Tramp (substitute-in-file-name "/foo:~/bar//baz") => "/scpc:foo:/baz".
  ;; - Cygwin (substitute-in-file-name "C:\bin") => "/usr/bin"
  ;;          (substitute-in-file-name "C:\") => "/"
  ;;          (substitute-in-file-name "C:\bi") => "/bi"
  (let* ((ustr (substitute-in-file-name qstr))
         (uprefix (substring ustr 0 upos))
         qprefix)
    ;; Main assumption: nothing after qpos should affect the text before upos,
    ;; so we can work our way backward from the end of qstr, one character
    ;; at a time.
    ;; Second assumptions: If qpos is far from the end this can be a bit slow,
    ;; so we speed it up by doing a first loop that skips a word at a time.
    ;; This word-sized loop is careful not to cut in the middle of env-vars.
    (while (let ((boundary (string-match "\\(\\$+{?\\)?\\w+\\W*\\'" qstr)))
             (and boundary
                  (progn
                    (setq qprefix (substring qstr 0 boundary))
                    (string-prefix-p uprefix
                                   (substitute-in-file-name qprefix)))))
      (setq qstr qprefix))
    (let ((qpos (length qstr)))
      (while (and (> qpos 0)
                  (string-prefix-p uprefix
                                   (substitute-in-file-name
                                    (substring qstr 0 (1- qpos)))))
        (setq qpos (1- qpos)))
      (cons qpos #'minibuffer-maybe-quote-filename))))

(defalias 'completion--file-name-table
  (completion-table-with-quoting #'completion-file-name-table
                                 #'substitute-in-file-name
                                 #'completion--sifn-requote)
  "Internal subroutine for `read-file-name'.  Do not call this.
This is a completion table for file names, like `completion-file-name-table'
except that it passes the file name through `substitute-in-file-name'.")

(defalias 'read-file-name-internal
  (completion-table-in-turn #'completion--embedded-envvar-table
                            #'completion--file-name-table)
  "Internal subroutine for `read-file-name'.  Do not call this.")

(defvar read-file-name-function #'read-file-name-default
  "The function called by `read-file-name' to do its work.
It should accept the same arguments as `read-file-name'.")

(defcustom insert-default-directory t
  "Non-nil means when reading a filename start with default dir in minibuffer.

When the initial minibuffer contents show a name of a file or a directory,
typing RETURN without editing the initial contents is equivalent to typing
the default file name.

If this variable is non-nil, the minibuffer contents are always
initially non-empty, and typing RETURN without editing will fetch the
default name, if one is provided.  Note however that this default name
is not necessarily the same as initial contents inserted in the minibuffer,
if the initial contents is just the default directory.

If this variable is nil, the minibuffer often starts out empty.  In
that case you may have to explicitly fetch the next history element to
request the default name; typing RETURN without editing will leave
the minibuffer empty.

For some commands, exiting with an empty minibuffer has a special meaning,
such as making the current buffer visit no file in the case of
`set-visited-file-name'."
  :type 'boolean)

(defcustom minibuffer-beginning-of-buffer-movement nil
  "Control how the `M-<' command in the minibuffer behaves.
If non-nil, the command will go to the end of the prompt (if
point is after the end of the prompt).  If nil, it will behave
like the `beginning-of-buffer' command."
  :version "27.1"
  :type 'boolean)

;; Not always defined, but only called if next-read-file-uses-dialog-p says so.
(declare-function x-file-dialog "xfns.c"
                  (prompt dir &optional default-filename mustmatch only-dir-p))

(defun read-file-name--defaults (&optional dir initial)
  (let ((default
	  (cond
	   ;; With non-nil `initial', use `dir' as the first default.
	   ;; Essentially, this mean reversing the normal order of the
	   ;; current directory name and the current file name, i.e.
	   ;; 1. with normal file reading:
	   ;; 1.1. initial input is the current directory
	   ;; 1.2. the first default is the current file name
	   ;; 2. with non-nil `initial' (e.g. for `find-alternate-file'):
	   ;; 2.2. initial input is the current file name
	   ;; 2.1. the first default is the current directory
	   (initial (abbreviate-file-name dir))
	   ;; In file buffers, try to get the current file name
	   (buffer-file-name
	    (abbreviate-file-name buffer-file-name))))
	(file-name-at-point
	 (run-hook-with-args-until-success 'file-name-at-point-functions)))
    (when file-name-at-point
      (setq default (delete-dups
		     (delete "" (delq nil (list file-name-at-point default))))))
    ;; Append new defaults to the end of existing `minibuffer-default'.
    (append
     (if (listp minibuffer-default) minibuffer-default (list minibuffer-default))
     (if (listp default) default (list default)))))

(defun read-file-name (prompt &optional dir default-filename mustmatch initial predicate)
  "Read file name, prompting with PROMPT and completing in directory DIR.
The return value is not expanded---you must call `expand-file-name' yourself.

DIR is the directory to use for completing relative file names.
It should be an absolute directory name, or nil (which means the
current buffer's value of `default-directory').

DEFAULT-FILENAME specifies the default file name to return if the
user exits the minibuffer with the same non-empty string inserted
by this function.  If DEFAULT-FILENAME is a string, that serves
as the default.  If DEFAULT-FILENAME is a list of strings, the
first string is the default.  If DEFAULT-FILENAME is omitted or
nil, then if INITIAL is non-nil, the default is DIR combined with
INITIAL; otherwise, if the current buffer is visiting a file,
that file serves as the default; otherwise, the default is simply
the string inserted into the minibuffer.

If the user exits with an empty minibuffer, return an empty
string.  (This happens only if the user erases the pre-inserted
contents, or if `insert-default-directory' is nil.)

Fourth arg MUSTMATCH can take the following values:
- nil means that the user can exit with any input.
- t means that the user is not allowed to exit unless
  the input is (or completes to) an existing file.
- `confirm' means that the user can exit with any input, but she needs
  to confirm her choice if the input is not an existing file.
- `confirm-after-completion' means that the user can exit with any
  input, but she needs to confirm her choice if she called
  `minibuffer-complete' right before `minibuffer-complete-and-exit'
  and the input is not an existing file.
- anything else behaves like t except that typing RET does not exit if it
  does non-null completion.

Fifth arg INITIAL specifies text to start with.

Sixth arg PREDICATE, if non-nil, should be a function of one
argument; then a file name is considered an acceptable completion
alternative only if PREDICATE returns non-nil with the file name
as its argument.

If this command was invoked with the mouse, use a graphical file
dialog if `use-dialog-box' is non-nil, and the window system or X
toolkit in use provides a file dialog box, and DIR is not a
remote file.  For graphical file dialogs, any of the special values
of MUSTMATCH `confirm' and `confirm-after-completion' are
treated as equivalent to nil.  Some graphical file dialogs respect
a MUSTMATCH value of t, and some do not (or it only has a cosmetic
effect, and does not actually prevent the user from entering a
non-existent file).

See also `read-file-name-completion-ignore-case'
and `read-file-name-function'."
  ;; If x-gtk-use-old-file-dialog = t (xg_get_file_with_selection),
  ;; then MUSTMATCH is enforced.  But with newer Gtk
  ;; (xg_get_file_with_chooser), it only has a cosmetic effect.
  ;; The user can still type a non-existent file name.
  (funcall (or read-file-name-function #'read-file-name-default)
           prompt dir default-filename mustmatch initial predicate))

(defvar minibuffer-local-filename-syntax
  (let ((table (make-syntax-table))
	(punctuation (car (string-to-syntax "."))))
    ;; Convert all punctuation entries to symbol.
    (map-char-table (lambda (c syntax)
		      (when (eq (car syntax) punctuation)
			(modify-syntax-entry c "_" table)))
		    table)
    (mapc
     (lambda (c)
       (modify-syntax-entry c "." table))
     '(?/ ?: ?\\))
    table)
  "Syntax table used when reading a file name in the minibuffer.")

;; minibuffer-completing-file-name is a variable used internally in minibuf.c
;; to determine whether to use minibuffer-local-filename-completion-map or
;; minibuffer-local-completion-map.  It shouldn't be exported to Elisp.
;; FIXME: Actually, it is also used in rfn-eshadow.el we'd otherwise have to
;; use (eq minibuffer-completion-table #'read-file-name-internal), which is
;; probably even worse.  Maybe We should add some read-file-name-setup-hook
;; instead, but for now, let's keep this non-obsolete.
;;(make-obsolete-variable 'minibuffer-completing-file-name nil "future" 'get)

(defun read-file-name-default (prompt &optional dir default-filename mustmatch initial predicate)
  "Default method for reading file names.
See `read-file-name' for the meaning of the arguments."
  (unless dir (setq dir (or default-directory "~/")))
  (unless (file-name-absolute-p dir) (setq dir (expand-file-name dir)))
  (unless default-filename
    (setq default-filename
          (cond
           ((null initial) buffer-file-name)
           ;; Special-case "" because (expand-file-name "" "/tmp/") returns
           ;; "/tmp" rather than "/tmp/" (bug#39057).
           ((equal "" initial) dir)
           (t (expand-file-name initial dir)))))
  ;; If dir starts with user's homedir, change that to ~.
  (setq dir (abbreviate-file-name dir))
  ;; Likewise for default-filename.
  (if default-filename
      (setq default-filename
	    (if (consp default-filename)
		(mapcar 'abbreviate-file-name default-filename)
	      (abbreviate-file-name default-filename))))
  (let ((insdef (cond
                 ((and insert-default-directory (stringp dir))
                  (if initial
                      (cons (minibuffer-maybe-quote-filename (concat dir initial))
                            (length (minibuffer-maybe-quote-filename dir)))
                    (minibuffer-maybe-quote-filename dir)))
                 (initial (cons (minibuffer-maybe-quote-filename initial) 0)))))

    (let ((ignore-case read-file-name-completion-ignore-case)
          (minibuffer-completing-file-name t)
          (pred (or predicate 'file-exists-p))
          (add-to-history nil))

      (let* ((val
              (if (or (not (next-read-file-uses-dialog-p))
                      ;; Graphical file dialogs can't handle remote
                      ;; files (Bug#99).
                      (file-remote-p dir))
                  ;; We used to pass `dir' to `read-file-name-internal' by
                  ;; abusing the `predicate' argument.  It's better to
                  ;; just use `default-directory', but in order to avoid
                  ;; changing `default-directory' in the current buffer,
                  ;; we don't let-bind it.
                  (let ((dir (file-name-as-directory
                              (expand-file-name dir))))
                    (minibuffer-with-setup-hook
                        (lambda ()
                          (setq default-directory dir)
                          ;; When the first default in `minibuffer-default'
                          ;; duplicates initial input `insdef',
                          ;; reset `minibuffer-default' to nil.
                          (when (equal (or (car-safe insdef) insdef)
                                       (or (car-safe minibuffer-default)
                                           minibuffer-default))
                            (setq minibuffer-default
                                  (cdr-safe minibuffer-default)))
                          (setq-local completion-ignore-case ignore-case)
                          ;; On the first request on `M-n' fill
                          ;; `minibuffer-default' with a list of defaults
                          ;; relevant for file-name reading.
                          (setq-local minibuffer-default-add-function
                               (lambda ()
                                 (with-current-buffer
                                     (window-buffer (minibuffer-selected-window))
				   (read-file-name--defaults dir initial))))
			  (set-syntax-table minibuffer-local-filename-syntax))
                      (completing-read prompt 'read-file-name-internal
                                       pred mustmatch insdef
                                       'file-name-history default-filename)))
                ;; If DEFAULT-FILENAME not supplied and DIR contains
                ;; a file name, split it.
                (let ((file (file-name-nondirectory dir))
                      ;; When using a dialog, revert to nil and non-nil
                      ;; interpretation of mustmatch. confirm options
                      ;; need to be interpreted as nil, otherwise
                      ;; it is impossible to create new files using
                      ;; dialogs with the default settings.
                      (dialog-mustmatch
                       (not (memq mustmatch
                                  '(nil confirm confirm-after-completion)))))
                  (when (and (not default-filename)
                             (not (zerop (length file))))
                    (setq default-filename file)
                    (setq dir (file-name-directory dir)))
                  (when default-filename
                    (setq default-filename
                          (expand-file-name (if (consp default-filename)
                                                (car default-filename)
                                              default-filename)
                                            dir)))
                  (setq add-to-history t)
                  (x-file-dialog prompt dir default-filename
                                 dialog-mustmatch
                                 (eq predicate 'file-directory-p)))))

             (replace-in-history (eq (car-safe file-name-history) val)))
        ;; If completing-read returned the inserted default string itself
        ;; (rather than a new string with the same contents),
        ;; it has to mean that the user typed RET with the minibuffer empty.
        ;; In that case, we really want to return ""
        ;; so that commands such as set-visited-file-name can distinguish.
        (when (consp default-filename)
          (setq default-filename (car default-filename)))
        (when (eq val default-filename)
          ;; In this case, completing-read has not added an element
          ;; to the history.  Maybe we should.
          (if (not replace-in-history)
              (setq add-to-history t))
          (setq val ""))
        (unless val (error "No file name specified"))

        (if (and default-filename
		 (not (file-remote-p dir))
                 (string-equal val (if (consp insdef) (car insdef) insdef)))
            (setq val default-filename))
        (setq val (substitute-in-file-name val))

        (if replace-in-history
            ;; Replace what Fcompleting_read added to the history
            ;; with what we will actually return.  As an exception,
            ;; if that's the same as the second item in
            ;; file-name-history, it's really a repeat (Bug#4657).
            (let ((val1 (minibuffer-maybe-quote-filename val)))
              (if history-delete-duplicates
                  (setcdr file-name-history
                          (delete val1 (cdr file-name-history))))
              (if (string= val1 (cadr file-name-history))
                  (pop file-name-history)
                (setcar file-name-history val1)))
          (when add-to-history
            (add-to-history 'file-name-history
                            (minibuffer-maybe-quote-filename val))))
	val))))

(defun internal-complete-buffer-except (&optional buffer)
  "Perform completion on all buffers excluding BUFFER.
BUFFER nil or omitted means use the current buffer.
Like `internal-complete-buffer', but removes BUFFER from the completion list."
  (let ((except (if (stringp buffer) buffer (buffer-name buffer))))
    (apply-partially #'completion-table-with-predicate
		     #'internal-complete-buffer
		     (lambda (name)
		       (not (equal (if (consp name) (car name) name) except)))
		     nil)))

;;; Old-style completion, used in Emacs-21 and Emacs-22.

(defun completion-emacs21-try-completion (string table pred _point)
  (let ((completion (try-completion string table pred)))
    (if (stringp completion)
        (cons completion (length completion))
      completion)))

(defun completion-emacs21-all-completions (string table pred _point)
  (completion-hilit-commonality
   (all-completions string table pred)
   (length string)
   (car (completion-boundaries string table pred ""))))

(defun completion-emacs22-try-completion (string table pred point)
  (let ((suffix (substring string point))
        (completion (try-completion (substring string 0 point) table pred)))
    (if (not (stringp completion))
        completion
      ;; Merge a trailing / in completion with a / after point.
      ;; We used to only do it for word completion, but it seems to make
      ;; sense for all completions.
      ;; Actually, claiming this feature was part of Emacs-22 completion
      ;; is pushing it a bit: it was only done in minibuffer-completion-word,
      ;; which was (by default) not bound during file completion, where such
      ;; slashes are most likely to occur.
      (if (and (not (zerop (length completion)))
               (eq ?/ (aref completion (1- (length completion))))
               (not (zerop (length suffix)))
               (eq ?/ (aref suffix 0)))
          ;; This leaves point after the / .
          (setq suffix (substring suffix 1)))
      (cons (concat completion suffix) (length completion)))))

(defun completion-emacs22-all-completions (string table pred point)
  (let ((beforepoint (substring string 0 point)))
    (completion-hilit-commonality
     (all-completions beforepoint table pred)
     point
     (car (completion-boundaries beforepoint table pred "")))))

;;; Basic completion.

(defun completion--merge-suffix (completion point suffix)
  "Merge end of COMPLETION with beginning of SUFFIX.
Simple generalization of the \"merge trailing /\" done in Emacs-22.
Return the new suffix."
  (if (and (not (zerop (length suffix)))
           (string-match "\\(.+\\)\n\\1" (concat completion "\n" suffix)
                         ;; Make sure we don't compress things to less
                         ;; than we started with.
                         point)
           ;; Just make sure we didn't match some other \n.
           (eq (match-end 1) (length completion)))
      (substring suffix (- (match-end 1) (match-beginning 1)))
    ;; Nothing to merge.
    suffix))

(defun completion-basic--pattern (beforepoint afterpoint bounds)
  (list (substring beforepoint (car bounds))
        'point
        (substring afterpoint 0 (cdr bounds))))

(defun completion-basic-try-completion (string table pred point)
  (let* ((beforepoint (substring string 0 point))
         (afterpoint (substring string point))
         (bounds (completion-boundaries beforepoint table pred afterpoint)))
    (if (zerop (cdr bounds))
        ;; `try-completion' may return a subtly different result
        ;; than `all+merge', so try to use it whenever possible.
        (let ((completion (try-completion beforepoint table pred)))
          (if (not (stringp completion))
              completion
            (cons
             (concat completion
                     (completion--merge-suffix completion point afterpoint))
             (length completion))))
      (let* ((suffix (substring afterpoint (cdr bounds)))
             (prefix (substring beforepoint 0 (car bounds)))
             (pattern (completion-pcm--optimize-pattern
                       (completion-basic--pattern
                        beforepoint afterpoint bounds)))
             (all (completion-pcm--all-completions prefix pattern table pred)))
        (if minibuffer-completing-file-name
            (setq all (completion-pcm--filename-try-filter all)))
        (completion-pcm--merge-try pattern all prefix suffix)))))

(defun completion-basic-all-completions (string table pred point)
  (let* ((beforepoint (substring string 0 point))
         (afterpoint (substring string point))
         (bounds (completion-boundaries beforepoint table pred afterpoint))
         ;; (suffix (substring afterpoint (cdr bounds)))
         (prefix (substring beforepoint 0 (car bounds)))
         (pattern (delete
                   "" (list (substring beforepoint (car bounds))
                            'point
                            (substring afterpoint 0 (cdr bounds)))))
         (all (completion-pcm--all-completions prefix pattern table pred)))
    (completion-hilit-commonality all point (car bounds))))

;;; Partial-completion-mode style completion.

(defvar completion-pcm--delim-wild-regex nil
  "Regular expression matching delimiters controlling the partial-completion.
Typically, this regular expression simply matches a delimiter, meaning
that completion can add something at (match-beginning 0), but if it has
a submatch 1, then completion can add something at (match-end 1).
This is used when the delimiter needs to be of size zero (e.g. the transition
from lowercase to uppercase characters).")

(defun completion-pcm--prepare-delim-re (delims)
  (setq completion-pcm--delim-wild-regex (concat "[" delims "*]")))

(defcustom completion-pcm-word-delimiters "-_./:| "
  "A string of characters treated as word delimiters for completion.
Some arcane rules:
If `]' is in this string, it must come first.
If `^' is in this string, it must not come first.
If `-' is in this string, it must come first or right after `]'.
In other words, if S is this string, then `[S]' must be a valid Emacs regular
expression (not containing character ranges like `a-z')."
  :set (lambda (symbol value)
         (set-default symbol value)
         ;; Refresh other vars.
         (completion-pcm--prepare-delim-re value))
  :initialize 'custom-initialize-reset
  :type 'string)

(defcustom completion-pcm-complete-word-inserts-delimiters nil
  "Treat the SPC or - inserted by `minibuffer-complete-word' as delimiters.
Those chars are treated as delimiters if this variable is non-nil.
I.e. if non-nil, M-x SPC will just insert a \"-\" in the minibuffer, whereas
if nil, it will list all possible commands in *Completions* because none of
the commands start with a \"-\" or a SPC."
  :version "24.1"
  :type 'boolean)

(defun completion-pcm--pattern-trivial-p (pattern)
  (and (stringp (car pattern))
       ;; It can be followed by `point' and "" and still be trivial.
       (let ((trivial t))
	 (dolist (elem (cdr pattern))
	   (unless (member elem '(point ""))
	     (setq trivial nil)))
	 trivial)))

(defun completion-pcm--string->pattern (string &optional point)
  "Split STRING into a pattern.
A pattern is a list where each element is either a string
or a symbol, see `completion-pcm--merge-completions'."
  (if (and point (< point (length string)))
      (let ((prefix (substring string 0 point))
            (suffix (substring string point)))
        (append (completion-pcm--string->pattern prefix)
                '(point)
                (completion-pcm--string->pattern suffix)))
    (let* ((pattern nil)
           (p 0)
           (p0 p)
           (pending nil))

      (while (and (setq p (string-match completion-pcm--delim-wild-regex
                                        string p))
                  (or completion-pcm-complete-word-inserts-delimiters
                      ;; If the char was added by minibuffer-complete-word,
                      ;; then don't treat it as a delimiter, otherwise
                      ;; "M-x SPC" ends up inserting a "-" rather than listing
                      ;; all completions.
                      (not (get-text-property p 'completion-try-word string))))
        ;; Usually, completion-pcm--delim-wild-regex matches a delimiter,
        ;; meaning that something can be added *before* it, but it can also
        ;; match a prefix and postfix, in which case something can be added
        ;; in-between (e.g. match [[:lower:]][[:upper:]]).
        ;; This is determined by the presence of a submatch-1 which delimits
        ;; the prefix.
        (if (match-end 1) (setq p (match-end 1)))
        (unless (= p0 p)
          (if pending (push pending pattern))
          (push (substring string p0 p) pattern))
        (setq pending nil)
        (if (eq (aref string p) ?*)
            (progn
              (push 'star pattern)
              (setq p0 (1+ p)))
          (push 'any pattern)
          (if (match-end 1)
              (setq p0 p)
            (push (substring string p (match-end 0)) pattern)
            ;; `any-delim' is used so that "a-b" also finds "array->beginning".
            (setq pending 'any-delim)
            (setq p0 (match-end 0))))
        (setq p p0))

      (when (> (length string) p0)
        (if pending (push pending pattern))
        (push (substring string p0) pattern))
      (nreverse pattern))))

(defun completion-pcm--optimize-pattern (p)
  ;; Remove empty strings in a separate phase since otherwise a ""
  ;; might prevent some other optimization, as in '(any "" any).
  (setq p (delete "" p))
  (let ((n '()))
    (while p
      (pcase p
        (`(,(or 'any 'any-delim) ,(or 'any 'point) . ,_)
         (setq p (cdr p)))
        ;; This is not just a performance improvement: it turns a
        ;; terminating `point' into an implicit `any', which affects
        ;; the final position of point (because `point' gets turned
        ;; into a non-greedy ".*?" regexp whereas we need it to be
        ;; greedy when it's at the end, see bug#38458).
        (`(point) (setq p nil)) ;Implicit terminating `any'.
        (_ (push (pop p) n))))
    (nreverse n)))

(defun completion-pcm--pattern->regex (pattern &optional group)
  (let ((re
         (concat "\\`"
                 (mapconcat
                  (lambda (x)
                    (cond
                     ((stringp x) (regexp-quote x))
                     (t
                      (let ((re (if (eq x 'any-delim)
                                    (concat completion-pcm--delim-wild-regex "*?")
                                  ".*?")))
                        (if (if (consp group) (memq x group) group)
                            (concat "\\(" re "\\)")
                          re)))))
                  pattern
                  ""))))
    ;; Avoid pathological backtracking.
    (while (string-match "\\.\\*\\?\\(?:\\\\[()]\\)*\\(\\.\\*\\?\\)" re)
      (setq re (replace-match "" t t re 1)))
    re))

(defun completion-pcm--pattern-point-idx (pattern)
  "Return index of subgroup corresponding to `point' element of PATTERN.
Return nil if there's no such element."
  (let ((idx nil)
        (i 0))
    (dolist (x pattern)
      (unless (stringp x)
        (cl-incf i)
        (if (eq x 'point) (setq idx i))))
    idx))

(defun completion-pcm--all-completions (prefix pattern table pred)
  "Find all completions for PATTERN in TABLE obeying PRED.
PATTERN is as returned by `completion-pcm--string->pattern'."
  ;; (cl-assert (= (car (completion-boundaries prefix table pred ""))
  ;;            (length prefix)))
  ;; Find an initial list of possible completions.
  (if (completion-pcm--pattern-trivial-p pattern)

      ;; Minibuffer contains no delimiters -- simple case!
      (all-completions (concat prefix (car pattern)) table pred)

    ;; Use all-completions to do an initial cull.  This is a big win,
    ;; since all-completions is written in C!
    (let* (;; Convert search pattern to a standard regular expression.
	   (regex (completion-pcm--pattern->regex pattern))
           (case-fold-search completion-ignore-case)
           (completion-regexp-list (cons regex completion-regexp-list))
	   (compl (all-completions
                   (concat prefix
                           (if (stringp (car pattern)) (car pattern) ""))
		   table pred)))
      (if (not (functionp table))
	  ;; The internal functions already obeyed completion-regexp-list.
	  compl
	(let ((poss ()))
	  (dolist (c compl)
	    (when (string-match-p regex c) (push c poss)))
	  (nreverse poss))))))

(defvar flex-score-match-tightness 3
  "Controls how the `flex' completion style scores its matches.

Value is a positive number.  A number smaller than 1 makes the
scoring formula reward matches scattered along the string, while
a number greater than one make the formula reward matches that
are clumped together.  I.e \"foo\" matches both strings
\"fbarbazoo\" and \"fabrobazo\", which are of equal length, but
only a value greater than one will score the former (which has
one large \"hole\" and a clumped-together \"oo\" match) higher
than the latter (which has two \"holes\" and three
one-letter-long matches).")

(defun completion-pcm--hilit-commonality (pattern completions)
  "Show where and how well PATTERN matches COMPLETIONS.
PATTERN, a list of symbols and strings as seen
`completion-pcm--merge-completions', is assumed to match every
string in COMPLETIONS.  Return a deep copy of COMPLETIONS where
each string is propertized with `completion-score', a number
between 0 and 1, and with faces `completions-common-part',
`completions-first-difference' in the relevant segments."
  (when completions
    (let* ((re (completion-pcm--pattern->regex pattern 'group))
           (point-idx (completion-pcm--pattern-point-idx pattern))
           (case-fold-search completion-ignore-case)
           last-md)
      (mapcar
       (lambda (str)
	 ;; Don't modify the string itself.
         (setq str (copy-sequence str))
         (unless (string-match re str)
           (error "Internal error: %s does not match %s" re str))
         (let* ((pos (if point-idx (match-beginning point-idx) (match-end 0)))
                (match-end (match-end 0))
                (md (cddr (setq last-md (match-data t last-md))))
                (from 0)
                (end (length str))
                ;; To understand how this works, consider these simple
                ;; ascii diagrams showing how the pattern "foo"
                ;; flex-matches "fabrobazo", "fbarbazoo" and
                ;; "barfoobaz":

                ;;      f abr o baz o
                ;;      + --- + --- +

                ;;      f barbaz oo
                ;;      + ------ ++

                ;;      bar foo baz
                ;;          +++

                ;; "+" indicates parts where the pattern matched.  A
                ;; "hole" in the middle of the string is indicated by
                ;; "-".  Note that there are no "holes" near the edges
                ;; of the string.  The completion score is a number
                ;; bound by ]0..1]: the higher the better and only a
                ;; perfect match (pattern equals string) will have
                ;; score 1.  The formula takes the form of a quotient.
                ;; For the numerator, we use the number of +, i.e. the
                ;; length of the pattern.  For the denominator, it
                ;; first computes
                ;;
                ;;     hole_i_contrib = 1 + (Li-1)^(1/tightness)
                ;;
                ;; , for each hole "i" of length "Li", where tightness
                ;; is given by `flex-score-match-tightness'.  The
                ;; final value for the denominator is then given by:
                ;;
                ;;    (SUM_across_i(hole_i_contrib) + 1) * len
                ;;
                ;; , where "len" is the string's length.
                (score-numerator 0)
                (score-denominator 0)
                (last-b 0)
                (update-score-and-face
                 (lambda (a b)
                   "Update score and face given match range (A B)."
                   (add-face-text-property a b
                                           'completions-common-part
                                           nil str)
                   (setq
                    score-numerator   (+ score-numerator (- b a)))
                   (unless (or (= a last-b)
                               (zerop last-b)
                               (= a (length str)))
                     (setq
                      score-denominator (+ score-denominator
                                           1
                                           (expt (- a last-b 1)
                                                 (/ 1.0
                                                    flex-score-match-tightness)))))
                   (setq
                    last-b              b))))
           (while md
             (funcall update-score-and-face from (pop md))
             (setq from (pop md)))
           ;; If `pattern' doesn't have an explicit trailing any, the
           ;; regex `re' won't produce match data representing the
           ;; region after the match.  We need to account to account
           ;; for that extra bit of match (bug#42149).
           (unless (= from match-end)
             (funcall update-score-and-face from match-end))
           (if (> (length str) pos)
               (add-face-text-property
                pos (1+ pos)
                'completions-first-difference
                nil str))
           (unless (zerop (length str))
             (put-text-property
              0 1 'completion-score
              (/ score-numerator (* end (1+ score-denominator)) 1.0) str)))
         str)
       completions))))

(defun completion-pcm--find-all-completions (string table pred point
                                                    &optional filter)
  "Find all completions for STRING at POINT in TABLE, satisfying PRED.
POINT is a position inside STRING.
FILTER is a function applied to the return value, that can be used, e.g. to
filter out additional entries (because TABLE might not obey PRED)."
  (unless filter (setq filter 'identity))
  (let* ((beforepoint (substring string 0 point))
         (afterpoint (substring string point))
         (bounds (completion-boundaries beforepoint table pred afterpoint))
         (prefix (substring beforepoint 0 (car bounds)))
         (suffix (substring afterpoint (cdr bounds)))
         firsterror)
    (setq string (substring string (car bounds) (+ point (cdr bounds))))
    (let* ((relpoint (- point (car bounds)))
           (pattern (completion-pcm--optimize-pattern
                     (completion-pcm--string->pattern string relpoint)))
           (all (condition-case-unless-debug err
                    (funcall filter
                             (completion-pcm--all-completions
                              prefix pattern table pred))
                  (error (setq firsterror err) nil))))
      (when (and (null all)
                 (> (car bounds) 0)
                 (null (ignore-errors (try-completion prefix table pred))))
        ;; The prefix has no completions at all, so we should try and fix
        ;; that first.
        (pcase-let* ((substring (substring prefix 0 -1))
                     (`(,subpat ,suball ,subprefix ,_subsuffix)
                      (completion-pcm--find-all-completions
                       substring table pred (length substring) filter))
                     (sep (aref prefix (1- (length prefix))))
                     ;; Text that goes between the new submatches and the
                     ;; completion substring.
                     (between nil))
          ;; Eliminate submatches that don't end with the separator.
          (dolist (submatch (prog1 suball (setq suball ())))
            (when (eq sep (aref submatch (1- (length submatch))))
              (push submatch suball)))
          (when suball
            ;; Update the boundaries and corresponding pattern.
            ;; We assume that all submatches result in the same boundaries
            ;; since we wouldn't know how to merge them otherwise anyway.
            ;; FIXME: COMPLETE REWRITE!!!
            (let* ((newbeforepoint
                    (concat subprefix (car suball)
                            (substring string 0 relpoint)))
                   (leftbound (+ (length subprefix) (length (car suball))))
                   (newbounds (completion-boundaries
                               newbeforepoint table pred afterpoint)))
              (unless (or (and (eq (cdr bounds) (cdr newbounds))
                               (eq (car newbounds) leftbound))
                          ;; Refuse new boundaries if they step over
                          ;; the submatch.
                          (< (car newbounds) leftbound))
                ;; The new completed prefix does change the boundaries
                ;; of the completed substring.
                (setq suffix (substring afterpoint (cdr newbounds)))
                (setq string
                      (concat (substring newbeforepoint (car newbounds))
                              (substring afterpoint 0 (cdr newbounds))))
                (setq between (substring newbeforepoint leftbound
                                         (car newbounds)))
                (setq pattern (completion-pcm--optimize-pattern
                               (completion-pcm--string->pattern
                                string
                                (- (length newbeforepoint)
                                   (car newbounds))))))
              (dolist (submatch suball)
                (setq all (nconc
                           (mapcar
                            (lambda (s) (concat submatch between s))
                            (funcall filter
                                     (completion-pcm--all-completions
                                      (concat subprefix submatch between)
                                      pattern table pred)))
                           all)))
              ;; FIXME: This can come in handy for try-completion,
              ;; but isn't right for all-completions, since it lists
              ;; invalid completions.
              ;; (unless all
              ;;   ;; Even though we found expansions in the prefix, none
              ;;   ;; leads to a valid completion.
              ;;   ;; Let's keep the expansions, tho.
              ;;   (dolist (submatch suball)
              ;;     (push (concat submatch between newsubstring) all)))
              ))
          (setq pattern (append subpat (list 'any (string sep))
                                (if between (list between)) pattern))
          (setq prefix subprefix)))
      (if (and (null all) firsterror)
          (signal (car firsterror) (cdr firsterror))
        (list pattern all prefix suffix)))))

(defun completion-pcm-all-completions (string table pred point)
  (pcase-let ((`(,pattern ,all ,prefix ,_suffix)
               (completion-pcm--find-all-completions string table pred point)))
    (when all
      (nconc (completion-pcm--hilit-commonality pattern all)
             (length prefix)))))

(defun completion--common-suffix (strs)
  "Return the common suffix of the strings STRS."
  (nreverse (try-completion "" (mapcar #'reverse strs))))

(defun completion-pcm--merge-completions (strs pattern)
  "Extract the commonality in STRS, with the help of PATTERN.
PATTERN can contain strings and symbols chosen among `star', `any', `point',
and `prefix'.  They all match anything (aka \".*\") but are merged differently:
`any' only grows from the left (when matching \"a1b\" and \"a2b\" it gets
  completed to just \"a\").
`prefix' only grows from the right (when matching \"a1b\" and \"a2b\" it gets
  completed to just \"b\").
`star' grows from both ends and is reified into a \"*\"  (when matching \"a1b\"
  and \"a2b\" it gets completed to \"a*b\").
`point' is like `star' except that it gets reified as the position of point
  instead of being reified as a \"*\" character.
The underlying idea is that we should return a string which still matches
the same set of elements."
  ;; When completing while ignoring case, we want to try and avoid
  ;; completing "fo" to "foO" when completing against "FOO" (bug#4219).
  ;; So we try and make sure that the string we return is all made up
  ;; of text from the completions rather than part from the
  ;; completions and part from the input.
  ;; FIXME: This reduces the problems of inconsistent capitalization
  ;; but it doesn't fully fix it: we may still end up completing
  ;; "fo-ba" to "foo-BAR" or "FOO-bar" when completing against
  ;; '("foo-barr" "FOO-BARD").
  (cond
   ((null (cdr strs)) (list (car strs)))
   (t
    (let ((re (completion-pcm--pattern->regex pattern 'group))
          (ccs ()))                     ;Chopped completions.

      ;; First chop each string into the parts corresponding to each
      ;; non-constant element of `pattern', using regexp-matching.
      (let ((case-fold-search completion-ignore-case))
        (dolist (str strs)
          (unless (string-match re str)
            (error "Internal error: %s doesn't match %s" str re))
          (let ((chopped ())
                (last 0)
                (i 1)
                next)
            (while (setq next (match-end i))
              (push (substring str last next) chopped)
              (setq last next)
              (setq i (1+ i)))
            ;; Add the text corresponding to the implicit trailing `any'.
            (push (substring str last) chopped)
            (push (nreverse chopped) ccs))))

      ;; Then for each of those non-constant elements, extract the
      ;; commonality between them.
      (let ((res ())
            (fixed ""))
        ;; Make the implicit trailing `any' explicit.
        (dolist (elem (append pattern '(any)))
          (if (stringp elem)
              (setq fixed (concat fixed elem))
            (let ((comps ()))
              (dolist (cc (prog1 ccs (setq ccs nil)))
                (push (car cc) comps)
                (push (cdr cc) ccs))
              ;; Might improve the likelihood to avoid choosing
              ;; different capitalizations in different parts.
              ;; In practice, it doesn't seem to make any difference.
              (setq ccs (nreverse ccs))
              (let* ((prefix (try-completion fixed comps))
                     (unique (or (and (eq prefix t) (setq prefix fixed))
                                 (eq t (try-completion prefix comps)))))
                (unless (or (eq elem 'prefix)
                            (equal prefix ""))
                  (push prefix res))
                ;; If there's only one completion, `elem' is not useful
                ;; any more: it can only match the empty string.
                ;; FIXME: in some cases, it may be necessary to turn an
                ;; `any' into a `star' because the surrounding context has
                ;; changed such that string->pattern wouldn't add an `any'
                ;; here any more.
                (unless unique
                  (push elem res)
                  ;; Extract common suffix additionally to common prefix.
                  ;; Don't do it for `any' since it could lead to a merged
                  ;; completion that doesn't itself match the candidates.
                  (when (and (memq elem '(star point prefix))
                             ;; If prefix is one of the completions, there's no
                             ;; suffix left to find.
                             (not (assoc-string prefix comps t)))
                    (let ((suffix
                           (completion--common-suffix
                            (if (zerop (length prefix)) comps
                              ;; Ignore the chars in the common prefix, so we
                              ;; don't merge '("abc" "abbc") as "ab*bc".
                              (let ((skip (length prefix)))
                                (mapcar (lambda (str) (substring str skip))
                                        comps))))))
                      (cl-assert (stringp suffix))
                      (unless (equal suffix "")
                        (push suffix res)))))
                (setq fixed "")))))
        ;; We return it in reverse order.
        res)))))

(defun completion-pcm--pattern->string (pattern)
  (mapconcat (lambda (x) (cond
                          ((stringp x) x)
                          ((eq x 'star) "*")
                          (t "")))           ;any, point, prefix.
             pattern
             ""))

;; We want to provide the functionality of `try', but we use `all'
;; and then merge it.  In most cases, this works perfectly, but
;; if the completion table doesn't consider the same completions in
;; `try' as in `all', then we have a problem.  The most common such
;; case is for filename completion where completion-ignored-extensions
;; is only obeyed by the `try' code.  We paper over the difference
;; here.  Note that it is not quite right either: if the completion
;; table uses completion-table-in-turn, this filtering may take place
;; too late to correctly fallback from the first to the
;; second alternative.
(defun completion-pcm--filename-try-filter (all)
  "Filter to adjust `all' file completion to the behavior of `try'."
  (when all
    (let ((try ())
          (re (concat "\\(?:\\`\\.\\.?/\\|"
                      (regexp-opt completion-ignored-extensions)
                      "\\)\\'")))
      (dolist (f all)
        (unless (string-match-p re f) (push f try)))
      (or (nreverse try) all))))


(defun completion-pcm--merge-try (pattern all prefix suffix)
  (cond
   ((not (consp all)) all)
   ((and (not (consp (cdr all)))        ;Only one completion.
         ;; Ignore completion-ignore-case here.
         (equal (completion-pcm--pattern->string pattern) (car all)))
    t)
   (t
    (let* ((mergedpat (completion-pcm--merge-completions all pattern))
           ;; `mergedpat' is in reverse order.  Place new point (by
           ;; order of preference) either at the old point, or at
           ;; the last place where there's something to choose, or
           ;; at the very end.
           (pointpat (or (memq 'point mergedpat)
                         (memq 'any   mergedpat)
                         (memq 'star  mergedpat)
                         ;; Not `prefix'.
                         mergedpat))
           ;; New pos from the start.
	   (newpos (length (completion-pcm--pattern->string pointpat)))
           ;; Do it afterwards because it changes `pointpat' by side effect.
           (merged (completion-pcm--pattern->string (nreverse mergedpat))))

      (setq suffix (completion--merge-suffix
                    ;; The second arg should ideally be "the position right
                    ;; after the last char of `merged' that comes from the text
                    ;; to be completed".  But completion-pcm--merge-completions
                    ;; currently doesn't give us that info.  So instead we just
                    ;; use the "last but one" position, which tends to work
                    ;; well in practice since `suffix' always starts
                    ;; with a boundary and we hence mostly/only care about
                    ;; merging this boundary (bug#15419).
                    merged (max 0 (1- (length merged))) suffix))
      (cons (concat prefix merged suffix) (+ newpos (length prefix)))))))

(defun completion-pcm-try-completion (string table pred point)
  (pcase-let ((`(,pattern ,all ,prefix ,suffix)
               (completion-pcm--find-all-completions
                string table pred point
                (if minibuffer-completing-file-name
                    'completion-pcm--filename-try-filter))))
    (completion-pcm--merge-try pattern all prefix suffix)))

;;; Substring completion
;; Mostly derived from the code of `basic' completion.

(defun completion-substring--all-completions
    (string table pred point &optional transform-pattern-fn)
  "Match the presumed substring STRING to the entries in TABLE.
Respect PRED and POINT.  The pattern used is a PCM-style
substring pattern, but it be massaged by TRANSFORM-PATTERN-FN, if
that is non-nil."
  (let* ((beforepoint (substring string 0 point))
         (afterpoint (substring string point))
         (bounds (completion-boundaries beforepoint table pred afterpoint))
         (suffix (substring afterpoint (cdr bounds)))
         (prefix (substring beforepoint 0 (car bounds)))
         (basic-pattern (completion-basic--pattern
                         beforepoint afterpoint bounds))
         (pattern (if (not (stringp (car basic-pattern)))
                      basic-pattern
                    (cons 'prefix basic-pattern)))
         (pattern (completion-pcm--optimize-pattern
                   (if transform-pattern-fn
                       (funcall transform-pattern-fn pattern)
                     pattern)))
         (all (completion-pcm--all-completions prefix pattern table pred)))
    (list all pattern prefix suffix (car bounds))))

(defun completion-substring-try-completion (string table pred point)
  (pcase-let ((`(,all ,pattern ,prefix ,suffix ,_carbounds)
               (completion-substring--all-completions
                string table pred point)))
    (if minibuffer-completing-file-name
        (setq all (completion-pcm--filename-try-filter all)))
    (completion-pcm--merge-try pattern all prefix suffix)))

(defun completion-substring-all-completions (string table pred point)
  (pcase-let ((`(,all ,pattern ,prefix ,_suffix ,_carbounds)
               (completion-substring--all-completions
                string table pred point)))
    (when all
      (nconc (completion-pcm--hilit-commonality pattern all)
             (length prefix)))))

;;; "flex" completion, also known as flx/fuzzy/scatter completion
;; Completes "foo" to "frodo" and "farfromsober"

(defcustom completion-flex-nospace nil
  "Non-nil if `flex' completion rejects spaces in search pattern."
  :version "27.1"
  :type 'boolean)

(put 'flex 'completion--adjust-metadata 'completion--flex-adjust-metadata)

(defun completion--flex-adjust-metadata (metadata)
  (cl-flet
      ((compose-flex-sort-fn
        (existing-sort-fn) ; wish `cl-flet' had proper indentation...
        (lambda (completions)
          (let ((pre-sorted
                 (if existing-sort-fn
                     (funcall existing-sort-fn completions)
                   completions)))
            (cond
             ((or (not (window-minibuffer-p))
                  ;; JT@2019-12-23: FIXME: this is still wrong.  What
                  ;; we need to test here is "some input that actually
                  ;; leads to flex filtering", not "something after
                  ;; the minibuffer prompt".  Among other
                  ;; inconsistencies, the latter is always true for
                  ;; file searches, meaning the next clauses will be
                  ;; ignored.
                  (> (point-max) (minibuffer-prompt-end)))
              (sort
               pre-sorted
               (lambda (c1 c2)
                 (let ((s1 (get-text-property 0 'completion-score c1))
                       (s2 (get-text-property 0 'completion-score c2)))
                   (> (or s1 0) (or s2 0))))))
             (t pre-sorted))))))
    `(metadata
      (display-sort-function
       . ,(compose-flex-sort-fn
           (completion-metadata-get metadata 'display-sort-function)))
      (cycle-sort-function
       . ,(compose-flex-sort-fn
           (completion-metadata-get metadata 'cycle-sort-function)))
      ,@(cdr metadata))))

(defun completion-flex--make-flex-pattern (pattern)
  "Convert PCM-style PATTERN into PCM-style flex pattern.

This turns
    (prefix \"foo\" point)
into
    (prefix \"f\" any \"o\" any \"o\" any point)
which is at the core of flex logic.  The extra
'any' is optimized away later on."
  (mapcan (lambda (elem)
            (if (stringp elem)
                (mapcan (lambda (char)
                          (list (string char) 'any))
                        elem)
              (list elem)))
          pattern))

(defun completion-flex-try-completion (string table pred point)
  "Try to flex-complete STRING in TABLE given PRED and POINT."
  (unless (and completion-flex-nospace (string-search " " string))
    (pcase-let ((`(,all ,pattern ,prefix ,suffix ,_carbounds)
                 (completion-substring--all-completions
                  string table pred point
                  #'completion-flex--make-flex-pattern)))
      (if minibuffer-completing-file-name
          (setq all (completion-pcm--filename-try-filter all)))
      ;; Try some "merging", meaning add as much as possible to the
      ;; user's pattern without losing any possible matches in `all'.
      ;; i.e this will augment "cfi" to "config" if all candidates
      ;; contain the substring "config".  FIXME: this still won't
      ;; augment "foo" to "froo" when matching "frodo" and
      ;; "farfromsober".
      (completion-pcm--merge-try pattern all prefix suffix))))

(defun completion-flex-all-completions (string table pred point)
  "Get flex-completions of STRING in TABLE, given PRED and POINT."
  (unless (and completion-flex-nospace (string-search " " string))
    (pcase-let ((`(,all ,pattern ,prefix ,_suffix ,_carbounds)
                 (completion-substring--all-completions
                  string table pred point
                  #'completion-flex--make-flex-pattern)))
      (when all
        (nconc (completion-pcm--hilit-commonality pattern all)
               (length prefix))))))

;; Initials completion
;; Complete /ums to /usr/monnier/src or lch to list-command-history.

(defun completion-initials-expand (str table pred)
  (let ((bounds (completion-boundaries str table pred "")))
    (unless (or (zerop (length str))
                ;; Only check within the boundaries, since the
                ;; boundary char (e.g. /) might be in delim-regexp.
                (string-match completion-pcm--delim-wild-regex str
                              (car bounds)))
      (if (zerop (car bounds))
          ;; FIXME: Don't hardcode "-" (bug#17559).
          (mapconcat 'string str "-")
        ;; If there's a boundary, it's trickier.  The main use-case
        ;; we consider here is file-name completion.  We'd like
        ;; to expand ~/eee to ~/e/e/e and /eee to /e/e/e.
        ;; But at the same time, we don't want /usr/share/ae to expand
        ;; to /usr/share/a/e just because we mistyped "ae" for "ar",
        ;; so we probably don't want initials to touch anything that
        ;; looks like /usr/share/foo.  As a heuristic, we just check that
        ;; the text before the boundary char is at most 1 char.
        ;; This allows both ~/eee and /eee and not much more.
        ;; FIXME: It sadly also disallows the use of ~/eee when that's
        ;; embedded within something else (e.g. "(~/eee" in Info node
        ;; completion or "ancestor:/eee" in bzr-revision completion).
        (when (< (car bounds) 3)
          (let ((sep (substring str (1- (car bounds)) (car bounds))))
            ;; FIXME: the above string-match checks the whole string, whereas
            ;; we end up only caring about the after-boundary part.
            (concat (substring str 0 (car bounds))
                    (mapconcat 'string (substring str (car bounds)) sep))))))))

(defun completion-initials-all-completions (string table pred _point)
  (let ((newstr (completion-initials-expand string table pred)))
    (when newstr
      (completion-pcm-all-completions newstr table pred (length newstr)))))

(defun completion-initials-try-completion (string table pred _point)
  (let ((newstr (completion-initials-expand string table pred)))
    (when newstr
      (completion-pcm-try-completion newstr table pred (length newstr)))))
\f
(defvar completing-read-function #'completing-read-default
  "The function called by `completing-read' to do its work.
It should accept the same arguments as `completing-read'.")

(defun completing-read-default (prompt collection &optional predicate
                                       require-match initial-input
                                       hist def inherit-input-method)
  "Default method for reading from the minibuffer with completion.
See `completing-read' for the meaning of the arguments."

  (when (consp initial-input)
    (setq initial-input
          (cons (car initial-input)
                ;; `completing-read' uses 0-based index while
                ;; `read-from-minibuffer' uses 1-based index.
                (1+ (cdr initial-input)))))

  (let* ((base-keymap (if require-match
                         minibuffer-local-must-match-map
                        minibuffer-local-completion-map))
         (keymap (if (memq minibuffer-completing-file-name '(nil lambda))
                     base-keymap
                   ;; Layer minibuffer-local-filename-completion-map
                   ;; on top of the base map.
                   (make-composed-keymap
                    minibuffer-local-filename-completion-map
                    ;; Set base-keymap as the parent, so that nil bindings
                    ;; in minibuffer-local-filename-completion-map can
                    ;; override bindings in base-keymap.
                    base-keymap)))
         (result
          (minibuffer-with-setup-hook
              (lambda ()
                (setq-local minibuffer-completion-table collection)
                (setq-local minibuffer-completion-predicate predicate)
                ;; FIXME: Remove/rename this var, see the next one.
                (setq-local minibuffer-completion-confirm
                            (unless (eq require-match t) require-match))
                (setq-local minibuffer--require-match require-match))
            (read-from-minibuffer prompt initial-input keymap
                                  nil hist def inherit-input-method))))
    (when (and (equal result "") def)
      (setq result (if (consp def) (car def) def)))
    result))
\f
;; Miscellaneous

(defun minibuffer-insert-file-name-at-point ()
  "Get a file name at point in original buffer and insert it to minibuffer."
  (interactive)
  (let ((file-name-at-point
	 (with-current-buffer (window-buffer (minibuffer-selected-window))
	   (run-hook-with-args-until-success 'file-name-at-point-functions))))
    (when file-name-at-point
      (insert file-name-at-point))))

(defun minibuffer-beginning-of-buffer (&optional arg)
  "Move to the logical beginning of the minibuffer.
This command behaves like `beginning-of-buffer', but if point is
after the end of the prompt, move to the end of the prompt.
Otherwise move to the start of the buffer."
  (declare (interactive-only "use `(goto-char (point-min))' instead."))
  (interactive "^P")
  (when (or (consp arg)
            (region-active-p))
    (push-mark))
  (goto-char (cond
              ;; We want to go N/10th of the way from the beginning.
              ((and arg (not (consp arg)))
	       (+ (point-min) 1
		  (/ (* (- (point-max) (point-min))
                        (prefix-numeric-value arg))
                     10)))
              ;; Go to the start of the buffer.
              ((or (null minibuffer-beginning-of-buffer-movement)
                   (<= (point) (minibuffer-prompt-end)))
	       (point-min))
              ;; Go to the end of the minibuffer.
              (t
               (minibuffer-prompt-end))))
  (when (and arg (not (consp arg)))
    (forward-line 1)))

(defmacro with-minibuffer-selected-window (&rest body)
  "Execute the forms in BODY from the minibuffer in its original window.
When used in a minibuffer window, select the window selected just before
the minibuffer was activated, and execute the forms."
  (declare (indent 0) (debug t))
  `(let ((window (minibuffer-selected-window)))
     (when window
       (with-selected-window window
         ,@body))))

(defun minibuffer-recenter-top-bottom (&optional arg)
  "Run `recenter-top-bottom' from the minibuffer in its original window."
  (interactive "P")
  (with-minibuffer-selected-window
    (recenter-top-bottom arg)))

(defun minibuffer-scroll-up-command (&optional arg)
  "Run `scroll-up-command' from the minibuffer in its original window."
  (interactive "^P")
  (with-minibuffer-selected-window
    (scroll-up-command arg)))

(defun minibuffer-scroll-down-command (&optional arg)
  "Run `scroll-down-command' from the minibuffer in its original window."
  (interactive "^P")
  (with-minibuffer-selected-window
    (scroll-down-command arg)))

(defun minibuffer-scroll-other-window (&optional arg)
  "Run `scroll-other-window' from the minibuffer in its original window."
  (interactive "P")
  (with-minibuffer-selected-window
    (scroll-other-window arg)))

(defun minibuffer-scroll-other-window-down (&optional arg)
  "Run `scroll-other-window-down' from the minibuffer in its original window."
  (interactive "^P")
  (with-minibuffer-selected-window
    (scroll-other-window-down arg)))

(defcustom minibuffer-default-prompt-format " (default %s)"
  "Format string used to output \"default\" values.
When prompting for input, there will often be a default value,
leading to prompts like \"Number of articles (default 50): \".
The \"default\" part of that prompt is controlled by this
variable, and can be set to, for instance, \" [%s]\" if you want
a shorter displayed prompt, or \"\", if you don't want to display
the default at all.

This variable is used by the `format-prompt' function."
  :version "28.1"
  :type 'string)

(defun format-prompt (prompt default &rest format-args)
  "Format PROMPT with DEFAULT according to `minibuffer-default-prompt-format'.
If FORMAT-ARGS is nil, PROMPT is used as a plain string.  If
FORMAT-ARGS is non-nil, PROMPT is used as a format control
string, and FORMAT-ARGS are the arguments to be substituted into
it.  See `format' for details.

If DEFAULT is a list, the first element is used as the default.
If not, the element is used as is.

If DEFAULT is nil or an empty string, no \"default value\" string
is included in the return value."
  (concat
   (if (null format-args)
       prompt
     (apply #'format prompt format-args))
   (and default
        (or (not (stringp default))
            (length> default 0))
        (format minibuffer-default-prompt-format
                (if (consp default)
                    (car default)
                  default)))
   ": "))

(provide 'minibuffer)

;;; minibuffer.el ends here

debug log:

solving 9f327df28f ...
found 9f327df28f in https://git.savannah.gnu.org/cgit/emacs.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/emacs.git
	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.