unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob 300a3908c14f7b089b683171dc94d3156efadf84 106596 bytes (raw)
name: lisp/emacs-lisp/checkdoc.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
 
;;; checkdoc.el --- check documentation strings for style requirements  -*- lexical-binding:t -*-

;; Copyright (C) 1997-1998, 2001-2018 Free Software Foundation, Inc.

;; Author: Eric M. Ludlam <zappo@gnu.org>
;; Version: 0.6.2
;; Keywords: docs, maint, lisp

;; 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:
;;
;;   The Emacs Lisp manual has a nice chapter on how to write
;; documentation strings.  Many stylistic suggestions are fairly
;; deterministic and easy to check for syntactically, but also easy
;; to forget.  The main checkdoc engine will perform the stylistic
;; checks needed to make sure these styles are remembered.
;;
;; There are two ways to use checkdoc:
;;   1) Periodically use `checkdoc' or `checkdoc-current-buffer'.
;;      `checkdoc' is a more interactive version of
;;      `checkdoc-current-buffer'
;;   2) Use `checkdoc-minor-mode' to automatically check your
;;      documentation whenever you evaluate Lisp code with C-M-x
;;      or [menu-bar emacs-lisp eval-buffer].  Additional key-bindings
;;      are also provided under C-c ? KEY
;;        (require 'checkdoc)
;;        (add-hook 'emacs-lisp-mode-hook 'checkdoc-minor-mode)
;;
;; Using `checkdoc':
;;
;;   The commands `checkdoc' and `checkdoc-ispell' are the top-level
;; entry points to all of the different checks that are available.  It
;; breaks examination of your Lisp file into four sections (comments,
;; documentation, messages, and spacing) and indicates its current
;; state in a status buffer.
;;
;;   The Comments check examines your headers, footers, and
;; various tags (such as "Code:") to make sure that your code is ready
;; for easy integration into existing systems.
;;
;;   The Documentation check deals with documentation strings
;; and their elements that help make Emacs easier to use.
;;
;;   The Messages check ensures that the strings displayed in the
;; minibuffer by some commands (such as `error' and `y-or-n-p')
;; are consistent with the Emacs environment.
;;
;;   The Spacing check cleans up white-space at the end of lines.
;;
;;   The interface while working with documentation and messages is
;; slightly different when being run in the interactive mode.  The
;; interface offers several options, including the ability to skip to
;; the next error, or back up to previous errors.  Auto-fixing is
;; turned off at this stage, but you can use the `f' or `F' key to fix
;; a given error (if the fix is available.)
;;
;; Auto-fixing:
;;
;;   There are four classifications of style errors in terms of how
;; easy they are to fix.  They are simple, complex, really complex,
;; and impossible.  (Impossible really means that checkdoc does not
;; have a fixing routine yet.)  Typically white-space errors are
;; classified as simple, and are auto-fixed by default.  Typographic
;; changes are considered complex, and the user is asked if they want
;; the problem fixed before checkdoc makes the change.  These changes
;; can be done without asking if `checkdoc-autofix-flag' is properly
;; set.  Potentially redundant changes are considered really complex,
;; and the user is always asked before a change is inserted.  The
;; variable `checkdoc-autofix-flag' controls how these types of errors
;; are fixed.
;;
;; Spell checking text:
;;
;;   The variable `checkdoc-spellcheck-documentation-flag' can be set
;; to customize how spell checking is to be done.  Since spell
;; checking can be quite slow, you can optimize how best you want your
;; checking done.  The default is `defun', which spell checks each time
;; `checkdoc-defun' or `checkdoc-eval-defun' is used.  Setting to nil
;; prevents spell checking during normal usage.
;;   Setting this variable to nil does not mean you cannot take
;; advantage of the spell checking.  You can instead use the
;; interactive functions `checkdoc-ispell-*' to check the spelling of
;; your documentation.
;;   There is a list of Lisp-specific words which checkdoc will
;; install into Ispell on the fly, but only if Ispell is not already
;; running.  Use `ispell-kill-ispell' to make checkdoc restart it with
;; these words enabled.
;;
;; Checking parameters:
;;
;;   You might not always want a function to have its parameters listed
;; in order.  When this is the case, put the following comment just in
;; front of the documentation string: "; checkdoc-order: nil"  This
;; overrides the value of `checkdoc-arguments-in-order-flag'.
;;
;;   If you specifically wish to avoid mentioning a parameter of a
;; function in the doc string (such as a hidden parameter, or a
;; parameter which is very obvious like events), you can have checkdoc
;; skip looking for it by putting the following comment just in front
;; of the documentation string: "; checkdoc-params: (args go here)"
;;
;; Checking message strings:
;;
;;   The text that follows the `error' and `y-or-n-p' commands is
;; also checked.  The documentation for `error' clearly states some
;; simple style rules to follow which checkdoc will auto-fix for you.
;; `y-or-n-p' also states that it should end in a space.  I added that
;; it should end in "? " since that is almost always used.
;;
;; Adding your own checks:
;;
;;   You can experiment with adding your own checks by setting the
;; hooks `checkdoc-style-functions' and `checkdoc-comment-style-functions'.
;; Return a string which is the error you wish to report.  The cursor
;; position should be preserved.
;;
;; Error errors:
;;
;;   Checkdoc does not always flag errors correctly.  There are a
;; couple ways you can coax your file into passing all of checkdoc's
;; tests through buffer local variables.
;;
;;   The variable `checkdoc-verb-check-experimental-flag' can be used
;; to turn off the check for verb-voice in case you use words that are
;; not semantically verbs, but are still in the incomplete list.
;;
;;   The variable `checkdoc-symbol-words' can be a list of words that
;; happen to also be symbols.  This is not a problem for one-word
;; symbols, but if you use a hyphenated word that is also a symbol,
;; then you may need this.
;;
;;   The symbol `checkdoc-force-docstrings-flag' can be set to nil if
;; you have many undocumented functions you don't wish to document.
;;
;;   See the above section "Checking Parameters" for details about
;; parameter checking.
;;
;; Dependencies:
;;
;;   This file requires lisp-mnt (Lisp maintenance routines) for the
;;   comment checkers.
;;
;;   Requires custom for Emacs v20.

;;; TO DO:
;;   Hook into the byte compiler on a defun/defvar level to generate
;;     warnings in the byte-compiler's warning/error buffer.
;;   Better ways to override more typical `eval' functions.  Advice
;;     might be good but hard to turn on/off as a minor mode.
;;
;;; Maybe Do:
;;   Code sweep checks for "forbidden functions", proper use of hooks,
;;     proper keybindings, and other items from the manual that are
;;     not specifically docstring related.  Would this even be useful?

;;; Code:
(defvar checkdoc-version "0.6.1"
  "Release version of checkdoc you are currently running.")

(require 'cl-lib)
(require 'help-mode) ;; for help-xref-info-regexp
(require 'thingatpt) ;; for handy thing-at-point-looking-at

(defvar compilation-error-regexp-alist)
(defvar compilation-mode-font-lock-keywords)

(defgroup checkdoc nil
  "Support for doc string checking in Emacs Lisp."
  :prefix "checkdoc"
  :group 'lisp
  :version "20.3")

(defcustom checkdoc-minor-mode-string " CDoc"
  "String to display in mode line when Checkdoc mode is enabled; nil for none."
  :type '(choice string (const :tag "None" nil))
  :version "23.1")

(defcustom checkdoc-autofix-flag 'semiautomatic
  "Non-nil means attempt auto-fixing of doc strings.
If this value is the symbol `query', then the user is queried before
any change is made.  If the value is `automatic', then all changes are
made without asking unless the change is very-complex.  If the value
is `semiautomatic' or any other value, then simple fixes are made
without asking, and complex changes are made by asking the user first.
The value `never' is the same as nil, never ask or change anything."
  :type '(choice (const automatic)
          (const query)
          (const never)
          (other :tag "semiautomatic" semiautomatic)))

(defcustom checkdoc-bouncy-flag t
  "Non-nil means to \"bounce\" to auto-fix locations.
Setting this to nil will silently make fixes that require no user
interaction.  See `checkdoc-autofix-flag' for auto-fixing details."
  :type 'boolean)

(defcustom checkdoc-force-docstrings-flag t
  "Non-nil means that all checkable definitions should have documentation.
Style guide dictates that interactive functions MUST have documentation,
and that it's good but not required practice to make non user visible items
have doc strings."
  :type 'boolean)
;;;###autoload(put 'checkdoc-force-docstrings-flag 'safe-local-variable #'booleanp)

(defcustom checkdoc-force-history-flag nil
  "Non-nil means that files should have a History section or ChangeLog file.
This helps document the evolution of, and recent changes to, the package."
  :type 'boolean)
;;;###autoload(put 'checkdoc-force-history-flag 'safe-local-variable #'booleanp)

(defcustom checkdoc-permit-comma-termination-flag nil
  "Non-nil means the first line of a docstring may end with a comma.
Ordinarily, a full sentence is required.  This may be misleading when
there is a substantial caveat to the one-line description -- the comma
should be used when the first part could stand alone as a sentence, but
it indicates that a modifying clause follows."
  :type 'boolean)
;;;###autoload(put 'checkdoc-permit-comma-termination-flag 'safe-local-variable #'booleanp)

(defcustom checkdoc-spellcheck-documentation-flag nil
  "Non-nil means run Ispell on text based on value.
This is automatically set to nil if Ispell does not exist on your
system.  Possible values are:

  nil         - Don't spell-check during basic style checks.
  defun       - Spell-check when style checking a single defun
  buffer      - Spell-check when style checking the whole buffer
  interactive - Spell-check during any interactive check.
  t           - Always spell-check"
  :type '(choice (const nil)
          (const defun)
          (const buffer)
          (const interactive)
          (const t)))
;;;###autoload(put 'checkdoc-spellcheck-documentation-flag 'safe-local-variable #'booleanp)

(defvar checkdoc-ispell-lisp-words
  '("alist" "emacs" "etags" "keymap" "paren" "regexp" "sexp" "xemacs")
  "List of words that are correct when spell-checking Lisp documentation.")
;;;###autoload(put 'checkdoc-ispell-list-words 'safe-local-variable #'checkdoc-list-of-strings-p)

(defcustom checkdoc-max-keyref-before-warn 10
  "The number of \\ [command-to-keystroke] tokens allowed in a doc string.
Any more than this and a warning is generated suggesting that the construct
\\ {keymap} be used instead."
  :type 'integer)

(defcustom checkdoc-arguments-in-order-flag nil
  "Non-nil means warn if arguments appear out of order.
Setting this to nil will mean only checking that all the arguments
appear in the proper form in the documentation, not that they are in
the same order as they appear in the argument list.  No mention is
made in the style guide relating to order."
  :version "26.1"
  :type 'boolean)
;;;###autoload(put 'checkdoc-arguments-in-order-flag 'safe-local-variable #'booleanp)

(defcustom checkdoc-package-keywords-flag nil
  "Non-nil means warn if this file's package keywords are not recognized.
Currently, all recognized keywords must be on `finder-known-keywords'."
  :version "25.1"
  :type 'boolean)

(define-obsolete-variable-alias 'checkdoc-style-hooks
  'checkdoc-style-functions "24.3")
(defvar checkdoc-style-functions nil
  "Hook run after the standard style check is completed.
All functions must return nil or a string representing the error found.
Useful for adding new user implemented commands.

Each hook is called with two parameters, (DEFUNINFO ENDPOINT).
DEFUNINFO is the return value of `checkdoc-defun-info'.  ENDPOINT is the
location of end of the documentation string.")

(define-obsolete-variable-alias 'checkdoc-comment-style-hooks
  'checkdoc-comment-style-functions "24.3")
(defvar checkdoc-comment-style-functions nil
  "Hook run after the standard comment style check is completed.
Must return nil if no errors are found, or a string describing the
problem discovered.  This is useful for adding additional checks.")

(defvar checkdoc-diagnostic-buffer "*Style Warnings*"
  "Name of warning message buffer.")

(defcustom checkdoc-verb-check-experimental-flag t
  "Non-nil means to attempt to check the voice of the doc string.
This check keys off some words which are commonly misused.  See the
variable `checkdoc-common-verbs-wrong-voice' if you wish to add your own."
  :type 'boolean)
;;;###autoload(put 'checkdoc-verb-check-experimental-flag 'safe-local-variable #'booleanp)

(defvar checkdoc-generate-compile-warnings-flag nil
  "Non-nil means generate warnings in a buffer for browsing.
Do not set this by hand, use a function like `checkdoc-current-buffer'
with a universal argument.")

(defcustom checkdoc-symbol-words nil
  "A list of symbol names (strings) which also happen to make good words.
These words are ignored when unquoted symbols are searched for.
This should be set in an Emacs Lisp file's local variables."
  :type '(repeat (symbol :tag "Word")))
;;;###autoload(put 'checkdoc-symbol-words 'safe-local-variable #'checkdoc-list-of-strings-p)

;;;###autoload
(defun checkdoc-list-of-strings-p (obj)
  "Return t when OBJ is a list of strings."
  ;; this is a function so it might be shared by checkdoc-proper-noun-list
  ;; and/or checkdoc-ispell-lisp-words in the future
  (and (listp obj)
       (not (memq nil (mapcar #'stringp obj)))))

(defvar checkdoc-proper-noun-list
  '("ispell" "xemacs" "emacs" "lisp")
  "List of words (not capitalized) which should be capitalized.")

(defvar checkdoc-proper-noun-regexp
  ;; "[.!?]" is for noun at end of a sentence, since those chars
  ;; are symbol syntax in emacs-lisp-mode and so don't match \\_>.
  ;; The \" allows it to be the last sentence in a docstring too.
  (concat "\\_<"
	  (regexp-opt checkdoc-proper-noun-list t)
	  "\\(\\_>\\|[.!?][ \t\n\"]\\)")
  "Regular expression derived from `checkdoc-proper-noun-regexp'.")
;;;###autoload(put 'checkdoc-proper-noun-regexp 'safe-local-variable 'stringp)

(defvar checkdoc-common-verbs-regexp nil
  "Regular expression derived from `checkdoc-common-verbs-regexp'.")
;;;###autoload(put 'checkdoc-common-verbs-regexp 'safe-local-variable 'stringp)

(defvar checkdoc-common-verbs-wrong-voice
  '(("adds" . "add")
    ("allows" . "allow")
    ("appends" . "append")
    ("applies" . "apply")
    ("arranges" . "arrange")
    ("brings" . "bring")
    ("calls" . "call")
    ("catches" . "catch")
    ("changes" . "change")
    ("checks" . "check")
    ("contains" . "contain")
    ("converts" . "convert")
    ("creates" . "create")
    ("destroys" . "destroy")
    ("disables" . "disable")
    ("executes" . "execute")
    ("evals" . "evaluate")
    ("evaluates" . "evaluate")
    ("finds" . "find")
    ("forces" . "force")
    ("gathers" . "gather")
    ("generates" . "generate")
    ("goes" . "go")
    ("guesses" . "guess")
    ("highlights" . "highlight")
    ("holds" . "hold")
    ("ignores" . "ignore")
    ("indents" . "indent")
    ("initializes" . "initialize")
    ("inserts" . "insert")
    ("installs" . "install")
    ("investigates" . "investigate")
    ("keeps" . "keep")
    ("kills" . "kill")
    ("leaves" . "leave")
    ("lets" . "let")
    ("loads" . "load")
    ("looks" . "look")
    ("makes" . "make")
    ("marks" . "mark")
    ("matches" . "match")
    ("moves" . "move")
    ("notifies" . "notify")
    ("offers" . "offer")
    ("parses" . "parse")
    ("performs" . "perform")
    ("prepares" . "prepare")
    ("prepends" . "prepend")
    ("reads" . "read")
    ("raises" . "raise")
    ("removes" . "remove")
    ("replaces" . "replace")
    ("resets" . "reset")
    ("restores" . "restore")
    ("returns" . "return")
    ("runs" . "run")
    ("saves" . "save")
    ("says" . "say")
    ("searches" . "search")
    ("selects" . "select")
    ("sets" . "set")
    ("sex" . "s*x")
    ("shows" . "show")
    ("signifies" . "signify")
    ("sorts" . "sort")
    ("starts" . "start")
    ("stores" . "store")
    ("switches" . "switch")
    ("tells" . "tell")
    ("tests" . "test")
    ("toggles" . "toggle")
    ("tries" . "try")
    ("turns" . "turn")
    ("undoes" . "undo")
    ("unloads" . "unload")
    ("unmarks" . "unmark")
    ("updates" . "update")
    ("uses" . "use")
    ("yanks" . "yank")
    )
  "Alist of common words in the wrong voice and what should be used instead.
Set `checkdoc-verb-check-experimental-flag' to nil to avoid this costly
and experimental check.  Do not modify this list without setting
the value of `checkdoc-common-verbs-regexp' to nil which cause it to
be re-created.")

(defvar checkdoc-syntax-table
  (let ((st (make-syntax-table emacs-lisp-mode-syntax-table)))
    ;; When dealing with syntax in doc strings, make sure that - are
    ;; encompassed in words so we can use cheap \\> to get the end of a symbol,
    ;; not the end of a word in a conglomerate.
    (modify-syntax-entry ?- "w" st)
    st)
  "Syntax table used by checkdoc in document strings.")

;;; User level commands
;;
;;;###autoload
(defun checkdoc ()
  "Interactively check the entire buffer for style errors.
The current status of the check will be displayed in a buffer which
the users will view as each check is completed."
  (interactive)
  (let ((status (list "Checking..." "-" "-" "-"))
	(checkdoc-spellcheck-documentation-flag
	 (car (memq checkdoc-spellcheck-documentation-flag
                    '(buffer interactive t))))
	;; if the user set autofix to never, then that breaks the
	;; obviously requested asking implied by using this function.
	;; Set it to paranoia level.
	(checkdoc-autofix-flag (if (or (not checkdoc-autofix-flag)
				       (eq checkdoc-autofix-flag 'never))
				   'query
				 checkdoc-autofix-flag))
	tmp)
    (checkdoc-display-status-buffer status)
    ;; check the comments
    (setf (nth 0 status)
          (cond
           ((not buffer-file-name) "Not checked")
           ((checkdoc-file-comments-engine) "Errors")
           (t "Ok")))
    (setf (nth 1 status) "Checking...")
    (checkdoc-display-status-buffer status)
    ;; Check the documentation
    (setq tmp (checkdoc-interactive nil t))
    (setf (nth 1 status)
          (if tmp (format "%d Errors" (length tmp)) "Ok"))
    (setf (nth 2 status) "Checking...")
    (checkdoc-display-status-buffer status)
    ;; Check the message text
    (setf (nth 2 status)
          (if (setq tmp (checkdoc-message-interactive nil t))
	      (format "%d Errors" (length tmp))
            "Ok"))
    (setf (nth 3 status) "Checking...")
    (checkdoc-display-status-buffer status)
    ;; Rogue spacing
    (setf (nth 3 status)
          (if (ignore-errors (checkdoc-rogue-spaces nil t))
	      "Errors"
            "Ok"))
    (checkdoc-display-status-buffer status)))

(defun checkdoc-display-status-buffer (check)
  "Display and update the status buffer for the current checkdoc mode.
CHECK is a list of four strings stating the current status of each
test; the nth string describes the status of the nth test."
  (let (temp-buffer-setup-hook)
    (with-output-to-temp-buffer "*Checkdoc Status*"
      (mapc #'princ
            (list "Buffer comments and tags:  " (nth 0 check)
                  "\nDocumentation style:       " (nth 1 check)
                  "\nMessage/Query text style:  " (nth 2 check)
                  "\nUnwanted Spaces:           " (nth 3 check)))))
  (shrink-window-if-larger-than-buffer
   (get-buffer-window "*Checkdoc Status*"))
  (message nil)
  (sit-for 0))

;;;###autoload
(defun checkdoc-interactive (&optional start-here showstatus)
  "Interactively check the current buffer for doc string errors.
Prefix argument START-HERE will start the checking from the current
point, otherwise the check starts at the beginning of the current
buffer.  Allows navigation forward and backwards through document
errors.  Does not check for comment or space warnings.
Optional argument SHOWSTATUS indicates that we should update the
checkdoc status window instead of the usual behavior."
  (interactive "P")
  (let ((checkdoc-spellcheck-documentation-flag
	 (car (memq checkdoc-spellcheck-documentation-flag
                    '(interactive t)))))
    (prog1
        ;; Due to a design flaw, this will never spell check
        ;; docstrings.
        (checkdoc-interactive-loop start-here showstatus
                                   #'checkdoc-next-error)
      ;; This is a workaround to perform spell checking.
      (checkdoc-interactive-ispell-loop start-here))))

;;;###autoload
(defun checkdoc-message-interactive (&optional start-here showstatus)
  "Interactively check the current buffer for message string errors.
Prefix argument START-HERE will start the checking from the current
point, otherwise the check starts at the beginning of the current
buffer.  Allows navigation forward and backwards through document
errors.  Does not check for comment or space warnings.
Optional argument SHOWSTATUS indicates that we should update the
checkdoc status window instead of the usual behavior."
  (interactive "P")
  (let ((checkdoc-spellcheck-documentation-flag
	 (car (memq checkdoc-spellcheck-documentation-flag
                    '(interactive t)))))
    (prog1
        ;; Due to a design flaw, this will never spell check messages.
        (checkdoc-interactive-loop start-here showstatus
                                   #'checkdoc-next-message-error)
      ;; This is a workaround to perform spell checking.
      (checkdoc-message-interactive-ispell-loop start-here))))

(defun checkdoc-interactive-loop (start-here showstatus findfunc)
  "Interactively loop over all errors that can be found by a given method.

If START-HERE is nil, searching starts at the beginning of the current
buffer, otherwise searching starts at START-HERE.  SHOWSTATUS
expresses the verbosity of the search, and whether ending the search
will auto-exit this function.

FINDFUNC is a symbol representing a function that will position the
cursor, and return error message text to present to the user.  It is
assumed that the cursor will stop just before a major sexp, which will
be highlighted to present the user with feedback as to the offending
style."
  ;; Determine where to start the test
  (let* ((begin (prog1 (point)
		  (if (not start-here) (goto-char (point-min)))))
	 ;; Assign a flag to spellcheck flag
	 (checkdoc-spellcheck-documentation-flag
	  (car (memq checkdoc-spellcheck-documentation-flag
                     '(buffer interactive t))))
	 ;; Fetch the error list
	 (err-list (list (funcall findfunc nil)))
	 (cdo nil)
	 (returnme nil)
	 c)
    (save-window-excursion
      (if (not (car err-list)) (setq err-list nil))
      ;; Include whatever function point is in for good measure.
      (beginning-of-defun)
      (while err-list
	(goto-char (cdr (car err-list)))
	;; The cursor should be just in front of the offending doc string
	(setq cdo (if (stringp (car (car err-list)))
	              (save-excursion (make-overlay
				       (point) (progn (forward-sexp 1)
						      (point))))
                    (make-overlay
		     (checkdoc-error-start (car (car err-list)))
		     (checkdoc-error-end (car (car err-list))))))
	(unwind-protect
	    (progn
	      (overlay-put cdo 'face 'highlight)
	      ;; Make sure the whole doc string is visible if possible.
	      (sit-for 0)
	      (if (and (= (following-char) ?\")
		       (not (pos-visible-in-window-p
			     (save-excursion (forward-sexp 1) (point))
			     (selected-window))))
		  (let ((l (count-lines (point)
					(save-excursion
					  (forward-sexp 1) (point)))))
		    (if (> l (window-height))
			(recenter 1)
		      (recenter (/ (- (window-height) l) 2))))
		(recenter))
	      (message "%s (C-h,%se,n,p,q)" (checkdoc-error-text
                                             (car (car err-list)))
		       (if (checkdoc-error-unfixable (car (car err-list)))
			   "" "f,"))
	      (save-excursion
		(goto-char (checkdoc-error-start (car (car err-list))))
		(if (not (pos-visible-in-window-p))
		    (recenter (- (window-height) 2)))
		(setq c (read-event)))
	      (if (not (integerp c)) (setq c ??))
	      (cond
	       ;; Exit condition
	       ((eq c ?\C-g) (signal 'quit nil))
	       ;; Request an auto-fix
	       ((memq c '(?y ?f))
		(delete-overlay cdo)
		(setq cdo nil)
		(goto-char (cdr (car err-list)))
		;; `automatic-then-never' tells the autofix function
		;; to only allow one fix to be automatic.  The autofix
		;; function will then set the flag to `never', allowing
		;; the checker to return a different error.
		(let ((checkdoc-autofix-flag 'automatic-then-never)
		      (fixed nil))
		  (funcall findfunc t)
		  (setq fixed (not (eq checkdoc-autofix-flag
				       'automatic-then-never)))
		  (if (not fixed)
		      (progn
			(message "A Fix was not available.")
			(sit-for 2))
		    (setq err-list (cdr err-list))))
		(beginning-of-defun)
		(let ((ne (funcall findfunc nil)))
		  (if ne
		      (setq err-list (cons ne err-list))
		    (cond ((not err-list)
			   (message "No More Stylistic Errors.")
			   (sit-for 2))
			  (t
			   (message
			    "No Additional style errors.  Continuing...")
			   (sit-for 2))))))
	       ;; Move to the next error (if available)
	       ((memq c '(?n ?\s))
		(let ((ne (funcall findfunc nil)))
		  (if (not ne)
		      (if showstatus
			  (setq returnme err-list
				err-list nil)
			(if (not err-list)
			    (message "No More Stylistic Errors.")
			  (message "No Additional style errors.  Continuing..."))
			(sit-for 2))
		    (setq err-list (cons ne err-list)))))
	       ;; Go backwards in the list of errors
	       ((memq c '(?p ?\C-?))
		(if (/= (length err-list) 1)
		    (progn
		      (setq err-list (cdr err-list))
		      (goto-char (cdr (car err-list)))
		      (beginning-of-defun))
		  (message "No Previous Errors.")
		  (sit-for 2)))
	       ;; Edit the buffer recursively.
	       ((eq c ?e)
		(checkdoc-recursive-edit
		 (checkdoc-error-text (car (car err-list))))
		(delete-overlay cdo)
		(setq err-list (cdr err-list)) ;back up the error found.
		(beginning-of-defun)
		(let ((ne (funcall findfunc nil)))
		  (if (not ne)
		      (if showstatus
			  (setq returnme err-list
				err-list nil)
			(message "No More Stylistic Errors.")
			(sit-for 2))
		    (setq err-list (cons ne err-list)))))
	       ;; Quit checkdoc
	       ((eq c ?q)
		(setq returnme err-list
		      err-list nil
		      begin (point)))
	       ;; Goofy stuff
	       (t
		(if (get-buffer-window "*Checkdoc Help*")
		    (progn
		      (delete-window (get-buffer-window "*Checkdoc Help*"))
		      (kill-buffer "*Checkdoc Help*"))
		  (with-output-to-temp-buffer "*Checkdoc Help*"
                    (with-current-buffer standard-output
                      (insert
                       "Checkdoc Keyboard Summary:\n"
                       (if (checkdoc-error-unfixable (car (car err-list)))
                           ""
                         (concat
                          "f, y    - auto Fix this warning without asking (if\
 available.)\n"
                          "         Very complex operations will still query.\n")
                         )
                       "e      - Enter recursive Edit.  Press C-M-c to exit.\n"
                       "SPC, n - skip to the Next error.\n"
                       "DEL, p - skip to the Previous error.\n"
                       "q      - Quit checkdoc.\n"
                       "C-h    - Toggle this help buffer.")))
		  (shrink-window-if-larger-than-buffer
		   (get-buffer-window "*Checkdoc Help*"))))))
	  (if cdo (delete-overlay cdo)))))
    (goto-char begin)
    (if (get-buffer "*Checkdoc Help*") (kill-buffer "*Checkdoc Help*"))
    (message "Checkdoc: Done.")
    returnme))

(defun checkdoc-interactive-ispell-loop (start-here)
  "Interactively spell check doc strings in the current buffer.
If START-HERE is nil, searching starts at the beginning of the current
buffer, otherwise searching starts at START-HERE."
  (when checkdoc-spellcheck-documentation-flag
    (save-excursion
      ;; Move point to where we need to start.
      (if start-here
          ;; Include whatever function point is in for good measure.
          (beginning-of-defun)
        (goto-char (point-min)))
      ;; Loop over docstrings.
      (while (checkdoc-next-docstring)
        (message "Searching for doc string spell error...%d%%"
                 (floor (* 100.0 (point)) (point-max)))
        (when (= (following-char) ?\")
          (checkdoc-ispell-docstring-engine
           (save-excursion (forward-sexp 1) (point-marker)))))
      (message "Checkdoc: Done."))))

(defun checkdoc-message-interactive-ispell-loop (start-here)
  "Interactively spell check messages in the current buffer.
If START-HERE is nil, searching starts at the beginning of the current
buffer, otherwise searching starts at START-HERE."
  (when checkdoc-spellcheck-documentation-flag
    (save-excursion
      ;; Move point to where we need to start.
      (if start-here
          ;; Include whatever function point is in for good measure.
          (beginning-of-defun)
        (goto-char (point-min)))
      ;; Loop over message strings.
      (while (checkdoc-message-text-next-string (point-max))
        (message "Searching for message string spell error...%d%%"
                 (floor (* 100.0 (point)) (point-max)))
        (if (= (following-char) ?\")
            (checkdoc-ispell-docstring-engine
             (save-excursion (forward-sexp 1) (point-marker)))))
      (message "Checkdoc: Done."))))


(defun checkdoc-next-error (enable-fix)
  "Find and return the next checkdoc error list, or nil.
Only documentation strings are checked.
An error list is of the form (WARNING . POSITION) where WARNING is the
warning text, and POSITION is the point in the buffer where the error
was found.  We can use points and not markers because we promise not
to edit the buffer before point without re-executing this check.
Argument ENABLE-FIX will enable auto-fixing while looking for the next
error.  This argument assumes that the cursor is already positioned to
perform the fix."
  (if enable-fix
      (checkdoc-this-string-valid)
    (let ((msg nil) (p (point))
	  (checkdoc-autofix-flag nil))
      (condition-case nil
	  (while (and (not msg) (checkdoc-next-docstring))
	    (message "Searching for doc string error...%d%%"
		     (floor (* 100.0 (point)) (point-max)))
	    (if (setq msg (checkdoc-this-string-valid))
		(setq msg (cons msg (point)))))
	;; Quit.. restore position,  Other errors, leave alone
	(quit (goto-char p)))
      msg)))

(defun checkdoc-next-message-error (enable-fix)
  "Find and return the next checkdoc message related error list, or nil.
Only text for error and `y-or-n-p' strings are checked.  See
`checkdoc-next-error' for details on the return value.
Argument ENABLE-FIX turns on the auto-fix feature.  This argument
assumes that the cursor is already positioned to perform the fix."
  (if enable-fix
      (checkdoc-message-text-engine)
    (let ((msg nil) (p (point)) (type nil)
	  (checkdoc-autofix-flag nil))
      (condition-case nil
	  (while (and (not msg)
		      (setq type
			    (checkdoc-message-text-next-string (point-max))))
	    (message "Searching for message string error...%d%%"
		     (floor (* 100.0 (point)) (point-max)))
	    (if (setq msg (checkdoc-message-text-engine type))
		(setq msg (cons msg (point)))))
	;; Quit.. restore position,  Other errors, leave alone
	(quit (goto-char p)))
      msg)))

(defun checkdoc-recursive-edit (msg)
  "Enter recursive edit to permit a user to fix some error checkdoc has found.
MSG is the error that was found, which is displayed in a help buffer."
  (with-output-to-temp-buffer "*Checkdoc Help*"
    (mapc #'princ
          (list "Error message:\n  " msg
                "\n\nEdit to fix this problem, and press C-M-c to continue.")))
  (shrink-window-if-larger-than-buffer
   (get-buffer-window "*Checkdoc Help*"))
  (message "When you're done editing press C-M-c to continue.")
  (unwind-protect
      (recursive-edit)
    (if (get-buffer-window "*Checkdoc Help*")
	(progn
	  (delete-window (get-buffer-window "*Checkdoc Help*"))
	  (kill-buffer "*Checkdoc Help*")))))

;;;###autoload
(defun checkdoc-eval-current-buffer ()
  "Evaluate and check documentation for the current buffer.
Evaluation is done first because good documentation for something that
doesn't work is just not useful.  Comments, doc strings, and rogue
spacing are all verified."
  (interactive)
  (eval-buffer nil)
  (checkdoc-current-buffer t))

;;;###autoload
(defun checkdoc-current-buffer (&optional take-notes)
  "Check current buffer for document, comment, error style, and rogue spaces.
With a prefix argument (in Lisp, the argument TAKE-NOTES),
store all errors found in a warnings buffer,
otherwise stop after the first error."
  (interactive "P")
  (if (called-interactively-p 'interactive)
      (message "Checking buffer for style..."))
  ;; Assign a flag to spellcheck flag
  (let ((checkdoc-spellcheck-documentation-flag
	 (car (memq checkdoc-spellcheck-documentation-flag
                    '(buffer t))))
	(checkdoc-autofix-flag (if take-notes 'never
				 checkdoc-autofix-flag))
	(checkdoc-generate-compile-warnings-flag
	 (or take-notes checkdoc-generate-compile-warnings-flag)))
    (if take-notes
	(checkdoc-start-section "checkdoc-current-buffer"))
    ;; every test is responsible for returning the cursor.
    (or (and buffer-file-name ;; only check comments in a file
	     (checkdoc-comments))
	(checkdoc-start)
	(checkdoc-message-text)
	(checkdoc-rogue-spaces)
        (when checkdoc-package-keywords-flag
          (checkdoc-package-keywords))
	(not (called-interactively-p 'interactive))
	(if take-notes (checkdoc-show-diagnostics))
	(message "Checking buffer for style...Done."))))

;;;###autoload
(defun checkdoc-file (file)
  "Check FILE for document, comment, error style, and rogue spaces."
  (with-current-buffer (find-file-noselect file)
    (let ((checkdoc-diagnostic-buffer "*warn*"))
      (checkdoc-current-buffer t))))

;;;###autoload
(defun checkdoc-start (&optional take-notes)
  "Start scanning the current buffer for documentation string style errors.
Only documentation strings are checked.
Use `checkdoc-continue' to continue checking if an error cannot be fixed.
Prefix argument TAKE-NOTES means to collect all the warning messages into
a separate buffer."
  (interactive "P")
  (let ((p (point)))
    (goto-char (point-min))
    (if (and take-notes (called-interactively-p 'interactive))
	(checkdoc-start-section "checkdoc-start"))
    (checkdoc-continue take-notes)
    ;; Go back since we can't be here without success above.
    (goto-char p)
    nil))

;;;###autoload
(defun checkdoc-continue (&optional take-notes)
  "Find the next doc string in the current buffer which has a style error.
Prefix argument TAKE-NOTES means to continue through the whole buffer and
save warnings in a separate buffer.  Second optional argument START-POINT
is the starting location.  If this is nil, `point-min' is used instead."
  (interactive "P")
  (let ((wrong nil) (msg nil)
	;; Assign a flag to spellcheck flag
	(checkdoc-spellcheck-documentation-flag
	 (car (memq checkdoc-spellcheck-documentation-flag
                    '(buffer t))))
	(checkdoc-autofix-flag (if take-notes 'never
				 checkdoc-autofix-flag))
	(checkdoc-generate-compile-warnings-flag
	 (or take-notes checkdoc-generate-compile-warnings-flag)))
    (save-excursion
      ;; If we are taking notes, encompass the whole buffer, otherwise
      ;; the user is navigating down through the buffer.
      (while (and (not wrong) (checkdoc-next-docstring))
	;; OK, let's look at the doc string.
	(setq msg (checkdoc-this-string-valid))
	(if msg (setq wrong (point)))))
    (if wrong
	(progn
	  (goto-char wrong)
	  (if (not take-notes)
	      (user-error "%s" (checkdoc-error-text msg)))))
    (checkdoc-show-diagnostics)
    (if (called-interactively-p 'interactive)
	(message "No style warnings."))))

(defun checkdoc-next-docstring ()
  "Move to the next doc string after point, and return t.
Return nil if there are no more doc strings."
  (let (found)
    (while (and (not (setq found (checkdoc--next-docstring)))
                (beginning-of-defun -1)))
    found))

(defun checkdoc--next-docstring ()
  "When looking at a definition with a doc string, find it.
Move to the next doc string after point, and return t.  When not
looking at a definition containing a doc string, return nil and
don't move point."
  (pcase (save-excursion (condition-case nil
                             (read (current-buffer))
                           ;; Conservatively skip syntax errors.
                           (invalid-read-syntax)))
    (`(,(or 'defun 'defvar 'defcustom 'defmacro 'defconst 'defsubst 'defadvice)
       ,(pred symbolp)
       ;; Require an initializer, i.e. ignore single-argument `defvar'
       ;; forms, which never have a doc string.
       ,_ . ,_)
     (down-list)
     ;; Skip over function or macro name, symbol to be defined, and
     ;; initializer or argument list.
     (forward-sexp 3)
     (skip-chars-forward " \n\t")
     t)))

;;;###autoload
(defun checkdoc-comments (&optional take-notes)
  "Find missing comment sections in the current Emacs Lisp file.
Prefix argument TAKE-NOTES non-nil means to save warnings in a
separate buffer.  Otherwise print a message.  This returns the error
if there is one."
  (interactive "P")
  (if take-notes (checkdoc-start-section "checkdoc-comments"))
  (if (not buffer-file-name)
      (error "Can only check comments for a file buffer"))
  (let* ((checkdoc-spellcheck-documentation-flag
	  (car (memq checkdoc-spellcheck-documentation-flag
                     '(buffer t))))
	 (checkdoc-autofix-flag (if take-notes 'never checkdoc-autofix-flag))
	 (e (checkdoc-file-comments-engine))
         (checkdoc-generate-compile-warnings-flag
          (or take-notes checkdoc-generate-compile-warnings-flag)))
    (if e (user-error "%s" (checkdoc-error-text e)))
    (checkdoc-show-diagnostics)
    e))

;;;###autoload
(defun checkdoc-rogue-spaces (&optional take-notes interact)
  "Find extra spaces at the end of lines in the current file.
Prefix argument TAKE-NOTES non-nil means to save warnings in a
separate buffer.  Otherwise print a message.  This returns the error
if there is one.
Optional argument INTERACT permits more interactive fixing."
  (interactive "P")
  (if take-notes (checkdoc-start-section "checkdoc-rogue-spaces"))
  (let* ((checkdoc-autofix-flag (if take-notes 'never checkdoc-autofix-flag))
	 (e (checkdoc-rogue-space-check-engine nil nil interact))
         (checkdoc-generate-compile-warnings-flag
          (or take-notes checkdoc-generate-compile-warnings-flag)))
    (if (not (called-interactively-p 'interactive))
	e
      (if e
	  (message "%s" (checkdoc-error-text e))
	(checkdoc-show-diagnostics)
	(message "Space Check: done.")))))

;;;###autoload
(defun checkdoc-message-text (&optional take-notes)
  "Scan the buffer for occurrences of the error function, and verify text.
Optional argument TAKE-NOTES causes all errors to be logged."
  (interactive "P")
  (if take-notes (checkdoc-start-section "checkdoc-message-text"))
  (let* ((p (point)) e
	 (checkdoc-autofix-flag (if take-notes 'never checkdoc-autofix-flag))
	 (checkdoc-generate-compile-warnings-flag
	  (or take-notes checkdoc-generate-compile-warnings-flag)))
    (setq e (checkdoc-message-text-search))
    (if (not (called-interactively-p 'interactive))
	e
      (if e
	  (user-error "%s" (checkdoc-error-text e))
	(checkdoc-show-diagnostics)))
    (goto-char p))
  (if (called-interactively-p 'interactive)
      (message "Checking interactive message text...done.")))

;;;###autoload
(defun checkdoc-eval-defun ()
  "Evaluate the current form with `eval-defun' and check its documentation.
Evaluation is done first so the form will be read before the
documentation is checked.  If there is a documentation error, then the display
of what was evaluated will be overwritten by the diagnostic message."
  (interactive)
  (call-interactively #'eval-defun)
  (checkdoc-defun))

;;;###autoload
(defun checkdoc-defun (&optional no-error)
  "Examine the doc string of the function or variable under point.
Call `error' if the doc string has problems.  If NO-ERROR is
non-nil, then do not call error, but call `message' instead.
If the doc string passes the test, then check the function for rogue white
space at the end of each line."
  (interactive)
  (save-excursion
    (beginning-of-defun)
    (when (checkdoc--next-docstring)
      (let* ((checkdoc-spellcheck-documentation-flag
              (car (memq checkdoc-spellcheck-documentation-flag
                         '(defun t))))
             (beg (save-excursion (beginning-of-defun) (point)))
             (end (save-excursion (end-of-defun) (point))))
        (dolist (fun (list #'checkdoc-this-string-valid
                           (lambda () (checkdoc-message-text-search beg end))
                           (lambda () (checkdoc-rogue-space-check-engine beg end))))
          (let ((msg (funcall fun)))
            (if msg (if no-error
                        (message "%s" (checkdoc-error-text msg))
                      (user-error "%s" (checkdoc-error-text msg))))))
        (if (called-interactively-p 'interactive)
            (message "Checkdoc: done."))))))

;;; Ispell interface for forcing a spell check
;;

;;;###autoload
(defun checkdoc-ispell ()
  "Check the style and spelling of everything interactively.
Calls `checkdoc' with spell-checking turned on.
Prefix argument is the same as for `checkdoc'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively #'checkdoc)))

;;;###autoload
(defun checkdoc-ispell-current-buffer ()
  "Check the style and spelling of the current buffer.
Calls `checkdoc-current-buffer' with spell-checking turned on.
Prefix argument is the same as for `checkdoc-current-buffer'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively #'checkdoc-current-buffer)))

;;;###autoload
(defun checkdoc-ispell-interactive ()
  "Check the style and spelling of the current buffer interactively.
Calls `checkdoc-interactive' with spell-checking turned on.
Prefix argument is the same as for `checkdoc-interactive'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively #'checkdoc-interactive)))

;;;###autoload
(defun checkdoc-ispell-message-interactive ()
  "Check the style and spelling of message text interactively.
Calls `checkdoc-message-interactive' with spell-checking turned on.
Prefix argument is the same as for `checkdoc-message-interactive'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively #'checkdoc-message-interactive
                        nil current-prefix-arg)))

;;;###autoload
(defun checkdoc-ispell-message-text ()
  "Check the style and spelling of message text interactively.
Calls `checkdoc-message-text' with spell-checking turned on.
Prefix argument is the same as for `checkdoc-message-text'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively #'checkdoc-message-text)))

;;;###autoload
(defun checkdoc-ispell-start ()
  "Check the style and spelling of the current buffer.
Calls `checkdoc-start' with spell-checking turned on.
Prefix argument is the same as for `checkdoc-start'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively #'checkdoc-start)))

;;;###autoload
(defun checkdoc-ispell-continue ()
  "Check the style and spelling of the current buffer after point.
Calls `checkdoc-continue' with spell-checking turned on.
Prefix argument is the same as for `checkdoc-continue'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively #'checkdoc-continue)))

;;;###autoload
(defun checkdoc-ispell-comments ()
  "Check the style and spelling of the current buffer's comments.
Calls `checkdoc-comments' with spell-checking turned on.
Prefix argument is the same as for `checkdoc-comments'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively #'checkdoc-comments)))

;;;###autoload
(defun checkdoc-ispell-defun ()
  "Check the style and spelling of the current defun with Ispell.
Calls `checkdoc-defun' with spell-checking turned on.
Prefix argument is the same as for `checkdoc-defun'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively #'checkdoc-defun)))

;;; Error Management
;;
;; Errors returned from checkdoc functions can have various
;; features and behaviors, so we need some ways of specifying
;; them, and making them easier to use in the wacked-out interfaces
;; people are requesting

(cl-defstruct (checkdoc-error
               (:constructor nil)
               (:constructor checkdoc--create-error (text start end &optional unfixable)))
  (text nil :read-only t)
  (start nil :read-only t)
  (end nil :read-only t)
  (unfixable nil :read-only t))

(defvar checkdoc-create-error-function #'checkdoc--create-error-for-checkdoc
  "Function called when Checkdoc encounters an error.
Should accept as arguments (TEXT START END &optional UNFIXABLE).

TEXT is the descriptive text of the error.  START and END define the region
it is sensible to highlight when describing the problem.
Optional argument UNFIXABLE means that the error has no auto-fix available.

An object of type `checkdoc-error' is returned if we are not
generating a buffered list of errors.")

(defun checkdoc-create-error (text start end &optional unfixable)
  "Used to create the return error text returned from all engines.
TEXT, START, END and UNFIXABLE conform to
`checkdoc-create-error-function', which see."
  (funcall checkdoc-create-error-function text start end unfixable))

(defun checkdoc--create-error-for-checkdoc (text start end &optional unfixable)
  "Create an error for Checkdoc.
TEXT, START, END and UNFIXABLE conform to
`checkdoc-create-error-function', which see."
  (if checkdoc-generate-compile-warnings-flag
      (progn (checkdoc-error start text)
	     nil)
    (checkdoc--create-error text start end unfixable)))

;;; Minor Mode specification
;;

(defvar checkdoc-minor-mode-map
  (let ((map (make-sparse-keymap))
	(pmap (make-sparse-keymap)))
    ;; Override some bindings
    (define-key map "\C-\M-x" 'checkdoc-eval-defun)
    (define-key map "\C-x`" 'checkdoc-continue)
    (if (not (featurep 'xemacs))
	(define-key map [menu-bar emacs-lisp eval-buffer]
	  'checkdoc-eval-current-buffer))
    ;; Add some new bindings under C-c ?
    (define-key pmap "x" 'checkdoc-defun)
    (define-key pmap "X" 'checkdoc-ispell-defun)
    (define-key pmap "`" 'checkdoc-continue)
    (define-key pmap "~" 'checkdoc-ispell-continue)
    (define-key pmap "s" 'checkdoc-start)
    (define-key pmap "S" 'checkdoc-ispell-start)
    (define-key pmap "d" 'checkdoc)
    (define-key pmap "D" 'checkdoc-ispell)
    (define-key pmap "b" 'checkdoc-current-buffer)
    (define-key pmap "B" 'checkdoc-ispell-current-buffer)
    (define-key pmap "e" 'checkdoc-eval-current-buffer)
    (define-key pmap "m" 'checkdoc-message-text)
    (define-key pmap "M" 'checkdoc-ispell-message-text)
    (define-key pmap "c" 'checkdoc-comments)
    (define-key pmap "C" 'checkdoc-ispell-comments)
    (define-key pmap " " 'checkdoc-rogue-spaces)

    ;; bind our submap into map
    (define-key map "\C-c?" pmap)
    map)
  "Keymap used to override evaluation key-bindings for documentation checking.")

;; Add in a menubar with easy-menu

(easy-menu-define
  nil checkdoc-minor-mode-map "Checkdoc Minor Mode Menu"
  '("CheckDoc"
    ["Interactive Buffer Style Check" checkdoc t]
    ["Interactive Buffer Style and Spelling Check" checkdoc-ispell t]
    ["Check Buffer" checkdoc-current-buffer t]
    ["Check and Spell Buffer" checkdoc-ispell-current-buffer t]
    "---"
    ["Interactive Style Check" checkdoc-interactive t]
    ["Interactive Style and Spelling Check" checkdoc-ispell-interactive t]
    ["Find First Style Error" checkdoc-start t]
    ["Find First Style or Spelling  Error" checkdoc-ispell-start t]
    ["Next Style Error" checkdoc-continue t]
    ["Next Style or Spelling  Error" checkdoc-ispell-continue t]
    ["Interactive Message Text Style Check" checkdoc-message-interactive t]
    ["Interactive Message Text Style and Spelling Check"
     checkdoc-ispell-message-interactive t]
    ["Check Message Text" checkdoc-message-text t]
    ["Check and Spell Message Text" checkdoc-ispell-message-text t]
    ["Check Comment Style" checkdoc-comments buffer-file-name]
    ["Check Comment Style and Spelling" checkdoc-ispell-comments
     buffer-file-name]
    ["Check for Rogue Spaces" checkdoc-rogue-spaces t]
    "---"
    ["Check Defun" checkdoc-defun t]
    ["Check and Spell Defun" checkdoc-ispell-defun t]
    ["Check and Evaluate Defun" checkdoc-eval-defun t]
    ["Check and Evaluate Buffer" checkdoc-eval-current-buffer t]
    ))
;; XEmacs requires some weird stuff to add this menu in a minor mode.
;; What is it?

;;;###autoload
(define-minor-mode checkdoc-minor-mode
  "Toggle automatic docstring checking (Checkdoc minor mode).
With a prefix argument ARG, enable Checkdoc minor mode if ARG is
positive, and disable it otherwise.  If called from Lisp, enable
the mode if ARG is omitted or nil.

In Checkdoc minor mode, the usual bindings for `eval-defun' which is
bound to \\<checkdoc-minor-mode-map>\\[checkdoc-eval-defun] and `checkdoc-eval-current-buffer' are overridden to include
checking of documentation strings.

\\{checkdoc-minor-mode-map}"
  nil checkdoc-minor-mode-string nil
  :group 'checkdoc)

;;; Subst utils
;;
(defsubst checkdoc-run-hooks (hookvar &rest args)
  "Run hooks in HOOKVAR with ARGS."
  (if (fboundp 'run-hook-with-args-until-success)
      (apply #'run-hook-with-args-until-success hookvar args)
    ;; This method was similar to above.  We ignore the warning
    ;; since we will use the above for future Emacs versions
    (apply #'run-hook-with-args hookvar args)))

(defsubst checkdoc-create-common-verbs-regexp ()
  "Rebuild the contents of `checkdoc-common-verbs-regexp'."
  (or checkdoc-common-verbs-regexp
      (setq checkdoc-common-verbs-regexp
	    (concat "\\<\\("
		    (mapconcat (lambda (e) (concat (car e)))
			       checkdoc-common-verbs-wrong-voice "\\|")
		    "\\)\\>"))))

;; Profiler says this is not yet faster than just calling assoc
;;(defun checkdoc-word-in-alist-vector (word vector)
;;  "Check to see if WORD is in the car of an element of VECTOR.
;;VECTOR must be sorted.  The CDR should be a replacement.  Since the
;;word list is getting bigger, it is time for a quick bisecting search."
;;  (let ((max (length vector)) (min 0) i
;;	(found nil) (fw nil))
;;    (setq i (/ max 2))
;;    (while (and (not found) (/= min max))
;;      (setq fw (car (aref vector i)))
;;      (cond ((string= word fw) (setq found (cdr (aref vector i))))
;;	    ((string< word fw) (setq max i))
;;	    (t (setq min i)))
;;      (setq i (/ (+ max min) 2))
;;      )
;;    found))

;;; Checking engines
;;
(defun checkdoc-this-string-valid ()
  "Return a message string if the current doc string is invalid.
Check for style only, such as the first line always being a complete
sentence, whitespace restrictions, and making sure there are no
hard-coded key-codes such as C-[char] or mouse-[number] in the comment.
See the style guide in the Emacs Lisp manual for more details."

  ;; Jump over comments between the last object and the doc string
  (while (looking-at "[ \t\n]*;")
    (forward-line 1)
    (beginning-of-line)
    (skip-chars-forward " \n\t"))

  (let ((fp (checkdoc-defun-info))
	(err nil))
    (setq
     err
     ;; * Every command, function, or variable intended for users to know
     ;;   about should have a documentation string.
     ;;
     ;; * An internal variable or subroutine of a Lisp program might as well
     ;;   have a documentation string.  In earlier Emacs versions, you could
     ;;   save space by using a comment instead of a documentation string,
     ;;   but that is no longer the case.
     (if (and (not (nth 1 fp))		; not a variable
	      (or (nth 2 fp)		; is interactive
		  checkdoc-force-docstrings-flag) ;or we always complain
	      (not (eq (following-char) ?\"))) ; no doc string
	 ;; Sometimes old code has comments where the documentation should
	 ;; be.  Let's see if we can find the comment, and offer to turn it
	 ;; into documentation for them.
	 (let ((have-comment nil)
	       (comment-start ";"))	; in case it's not default
	   (condition-case nil
	       (progn
		 (forward-sexp -1)
		 (forward-sexp 1)
		 (skip-chars-forward "\n \t")
		 (setq have-comment (looking-at comment-start)))
	     (error nil))
	   (if have-comment
	       (if (or (eq checkdoc-autofix-flag
			   'automatic-then-never)
		       (checkdoc-y-or-n-p
			"Convert comment to documentation? "))
		   (save-excursion
		     ;; Our point is at the beginning of the comment!
		     ;; Insert a quote, then remove the comment chars.
		     (insert "\"")
		     (let ((docstring-start-point (point)))
		       (while (looking-at comment-start)
			 (while (looking-at comment-start)
			   (delete-char 1))
			 (if (looking-at "[ \t]+")
			     (delete-region (match-beginning 0) (match-end 0)))
			 (forward-line 1)
			 (beginning-of-line)
			 (skip-chars-forward " \t")
			 (if (looking-at comment-start)
			     (progn
			       (beginning-of-line)
			       (zap-to-char 1 ?\;))))
		       (beginning-of-line)
		       (forward-char -1)
		       (insert "\"")
		       (forward-char -1)
		       ;; quote any double-quote characters in the comment.
		       (while (search-backward "\"" docstring-start-point t)
			 (insert "\\"))
		       (if (eq checkdoc-autofix-flag 'automatic-then-never)
			   (setq checkdoc-autofix-flag 'never))))
		 (checkdoc-create-error
		  "You should convert this comment to documentation"
		  (point) (line-end-position)))
	     (checkdoc-create-error
	      (if (nth 2 fp)
		  "All interactive functions should have documentation"
		"All variables and subroutines might as well have a \
documentation string")
	      (point) (+ (point) 1) t)))))
    (if (and (not err) (= (following-char) ?\"))
        (with-syntax-table checkdoc-syntax-table
          (checkdoc-this-string-valid-engine fp))
      err)))

(defun checkdoc-this-string-valid-engine (fp)
  "Return an error list or string if the current doc string is invalid.
Depends on `checkdoc-this-string-valid' to reset the syntax table so that
regexp short cuts work.  FP is the function defun information."
  (let ((case-fold-search nil)
	;; Use a marker so if an early check modifies the text,
	;; we won't accidentally lose our place.  This could cause
	;; end-of doc string whitespace to also delete the " char.
	(s (point))
	(e (if (= (following-char) ?\")
	       (save-excursion (forward-sexp 1) (point-marker))
	     (point))))
    (or
     ;; * *Do not* indent subsequent lines of a documentation string so that
     ;;   the text is lined up in the source code with the text of the first
     ;;   line.  This looks nice in the source code, but looks bizarre when
     ;;   users view the documentation.  Remember that the indentation
     ;;   before the starting double-quote is not part of the string!
     (save-excursion
       (forward-line 1)
       (beginning-of-line)
       (if (and (< (point) e)
		(looking-at "\\([ \t]+\\)[^ \t\n]"))
	   (if (checkdoc-autofix-ask-replace (match-beginning 1)
					     (match-end 1)
					     "Remove this whitespace? "
					     "")
	       nil
	     (checkdoc-create-error
	      "Second line should not have indentation"
	      (match-beginning 1)
	      (match-end 1)))))
     ;; * Check for '(' in column 0.
     (save-excursion
       (when (re-search-forward "^(" e t)
	 (if (checkdoc-autofix-ask-replace (match-beginning 0)
					   (match-end 0)
					   (format-message "Escape this `('? ")
					   "\\(")
	     nil
	   (checkdoc-create-error
	    "Open parenthesis in column 0 should be escaped"
	    (match-beginning 0) (match-end 0)))))
     ;; * Do not start or end a documentation string with whitespace.
     (let (start end)
       (if (or (if (looking-at "\"\\([ \t\n]+\\)")
		   (setq start (match-beginning 1)
			 end (match-end 1)))
	       (save-excursion
		 (forward-sexp 1)
		 (forward-char -1)
		 (if (/= (skip-chars-backward " \t\n") 0)
		     (setq start (point)
			   end (1- e)))))
	   (if (checkdoc-autofix-ask-replace
		start end "Remove this whitespace? " "")
	       nil
	     (checkdoc-create-error
	      "Documentation strings should not start or end with whitespace"
	      start end))))
     ;; * The first line of the documentation string should consist of one
     ;;   or two complete sentences that stand on their own as a summary.
     ;;   `M-x apropos' displays just the first line, and if it doesn't
     ;;   stand on its own, the result looks bad.  In particular, start the
     ;;   first line with a capital letter and end with a period.
     (save-excursion
       (end-of-line)
       (skip-chars-backward " \t\n")
       (if (> (point) e) (goto-char e)) ;of the form (defun n () "doc" nil)
       (forward-char -1)
       (cond
	((and (eq (following-char) ?\")
	      ;; A backslashed double quote at the end of a sentence
	      (not (eq (preceding-char) ?\\)))
	 ;; We might have to add a period in this case
	 (forward-char -1)
	 (if (looking-at "[.!?]")
	     nil
	   (forward-char 1)
	   (if (checkdoc-autofix-ask-replace
		(point) (1+ (point)) "Add period to sentence? "
		".\"" t)
	       nil
	     (checkdoc-create-error
	      "First sentence should end with punctuation"
	      (point) (1+ (point))))))
	((looking-at "[\\!?;:.)]")
	 ;; These are ok
	 nil)
        ((and checkdoc-permit-comma-termination-flag (= (following-char) ?,))
	 nil)
	(t
	 ;; If it is not a complete sentence, let's see if we can
	 ;; predict a clever way to make it one.
	 (let ((msg "First line is not a complete sentence")
	       (e (point)))
	   (beginning-of-line)
	   (if (re-search-forward "\\. +" e t)
	       ;; Here we have found a complete sentence, but no break.
	       (if (checkdoc-autofix-ask-replace
		    (1+ (match-beginning 0)) (match-end 0)
		    "First line not a complete sentence.  Add RET here? "
		    "\n" t)
		   (let (l1 l2)
		     (end-of-line 2)
		     (setq l1 (current-column)
			   l2 (save-excursion
				(end-of-line 2)
				(current-column)))
		     (if (> (+ l1 l2 1) 80)
			 (setq msg "Incomplete auto-fix; doc string \
may require more formatting")
		       ;; We can merge these lines!  Replace this CR
		       ;; with a space.
		       (delete-char 1) (insert " ")
		       (setq msg nil))))
	     ;; Let's see if there is enough room to draw the next
	     ;; line's sentence up here.  I often get hit w/
	     ;; auto-fill moving my words around.
	     (let ((numc (progn (end-of-line) (- 80 (current-column))))
		   (p    (point)))
	       (forward-line 1)
	       (beginning-of-line)
	       (if (and (re-search-forward "[.!?:\"]\\([ \t\n]+\\|\"\\)"
					   (line-end-position) t)
			(< (current-column) numc))
		   (if (checkdoc-autofix-ask-replace
			p (1+ p)
			"1st line not a complete sentence.  Join these lines? "
			" " t)
		       (progn
			 ;; They said yes.  We have more fill work to do...
			 (goto-char (match-beginning 1))
			 (delete-region (point) (match-end 1))
			 (insert "\n")
			 (setq msg nil))))))
	   (if msg
	       (checkdoc-create-error msg s (save-excursion
					      (goto-char s)
					      (line-end-position))))))))
     ;; Continuation of above.  Make sure our sentence is capitalized.
     (save-excursion
       (skip-chars-forward "\"\\*")
       (if (looking-at "[a-z]")
	   (if (checkdoc-autofix-ask-replace
		(match-beginning 0) (match-end 0)
		"Capitalize your sentence? " (upcase (match-string 0))
		t)
	       nil
	     (checkdoc-create-error
	      "First line should be capitalized"
	      (match-beginning 0) (match-end 0)))
	 nil))
     ;;   * Don't write key sequences directly in documentation strings.
     ;;     Instead, use the `\\[...]' construct to stand for them.
     (save-excursion
       (let ((f nil) (m nil) (start (point))
	     (re "[^`‘A-Za-z0-9_]\\([CMA]-[a-zA-Z]\\|\\(\\([CMA]-\\)?\
mouse-[0-3]\\)\\)\\>"))
	 ;; Find the first key sequence not in a sample
	 (while (and (not f) (setq m (re-search-forward re e t)))
	   (setq f (not (checkdoc-in-sample-code-p start e))))
	 (if m
	     (checkdoc-create-error
	      (concat
	       "Keycode " (match-string 1)
	       " embedded in doc string.  Use \\\\<keymap> & \\\\[function] "
	       "instead")
	      (match-beginning 1) (match-end 1) t))))
     ;; It is not practical to use `\\[...]' very many times, because
     ;; display of the documentation string will become slow.  So use this
     ;; to describe the most important commands in your major mode, and
     ;; then use `\\{...}' to display the rest of the mode's keymap.
     (save-excursion
       (if (and (re-search-forward "\\\\\\\\\\[\\w+" e t
				   (1+ checkdoc-max-keyref-before-warn))
		(not (re-search-forward "\\\\\\\\{\\w+}" e t)))
	   (checkdoc-create-error
	    "Too many occurrences of \\[function].  Use \\{keymap} instead"
	    s (marker-position e))))
     ;; Ambiguous quoted symbol.  When a symbol is both bound and fbound,
     ;; and is referred to in documentation, it should be prefixed with
     ;; something to disambiguate it.  This check must be before the
     ;; 80 column check because it will probably break that.
     (save-excursion
       (let ((case-fold-search t)
	     (ret nil) mb me)
	 (while (and (re-search-forward
                      "[`‘]\\(\\sw\\(\\sw\\|\\s_\\)+\\)['’]" e t)
		     (not ret))
	   (let* ((ms1 (match-string 1))
		  (sym (intern-soft ms1)))
	     (setq mb (match-beginning 1)
		   me (match-end 1))
	     (if (and sym (boundp sym) (fboundp sym)
		      (save-excursion
			(goto-char mb)
			(forward-word-strictly -1)
			(not (looking-at
			      "variable\\|option\\|function\\|command\\|symbol"))))
		 (if (checkdoc-autofix-ask-replace
		      mb me "Prefix this ambiguous symbol? " ms1 t)
		     ;; We didn't actually replace anything.  Here we find
		     ;; out what special word form they wish to use as
		     ;; a prefix.
		     (let ((disambiguate
			    (completing-read
			     "Disambiguating Keyword (default variable): "
			     '(("function") ("command") ("variable")
			       ("option") ("symbol"))
			     nil t nil nil "variable")))
		       (goto-char (1- mb))
		       (insert disambiguate " ")
		       (forward-word-strictly 1))
		   (setq ret
			 (format "Disambiguate %s by preceding w/ \
function,command,variable,option or symbol." ms1))))))
	 (if ret
	     (checkdoc-create-error ret mb me)
	   nil)))
     ;; * Format the documentation string so that it fits in an
     ;;   Emacs window on an 80-column screen.  It is a good idea
     ;;   for most lines to be no wider than 60 characters.  The
     ;;   first line can be wider if necessary to fit the
     ;;   information that ought to be there.
     (save-excursion
       (let ((start (point))
	     (eol nil))
	 (while (and (< (point) e)
		     (or (progn (end-of-line) (setq eol (point))
				(< (current-column) 80))
			 (progn (beginning-of-line)
				(re-search-forward "\\\\\\\\[[<{]"
						   eol t))
			 (checkdoc-in-sample-code-p start e)))
	   (forward-line 1))
	 (end-of-line)
	 (if (and (< (point) e) (> (current-column) 80))
	     (checkdoc-create-error
	      "Some lines are over 80 columns wide"
	      s (save-excursion (goto-char s) (line-end-position))))))
     ;; Here we deviate to tests based on a variable or function.
     ;; We must do this before checking for symbols in quotes because there
     ;; is a chance that just such a symbol might really be an argument.
     (cond ((eq (nth 1 fp) t)
	    ;; This is if we are in a variable
	    (or
	     ;; * The documentation string for a variable that is a
	     ;;   yes-or-no flag should start with words such as Non-nil
	     ;;   means..., to make it clear that all non-nil values are
	     ;;   equivalent and indicate explicitly what nil and non-nil
	     ;;   mean.
	     ;; * If a user option variable records a true-or-false
	     ;;   condition, give it a name that ends in `-flag'.

	     ;; "True ..." should be "Non-nil ..."
	     (when (looking-at "\"\\*?\\(True\\)\\b")
               (if (checkdoc-autofix-ask-replace
                    (match-beginning 1) (match-end 1)
                    "Say \"Non-nil\" instead of \"True\"? "
                    "Non-nil")
                   nil
                 (checkdoc-create-error
                  "\"True\" should usually be \"Non-nil\""
                  (match-beginning 1) (match-end 1))))

	     ;; If the variable has -flag in the name, make sure
	     (if (and (string-match "-flag$" (car fp))
		      (not (looking-at "\"\\*?Non-nil\\s-+means\\s-+")))
		 (checkdoc-create-error
		  "Flag variable doc strings should usually start: Non-nil means"
		  s (marker-position e) t))
             ;; Don't rename variable to "foo-flag".  This is unnecessary
             ;; and such names often end up inconvenient when the variable
             ;; is later expanded to non-boolean values. --Stef
	     ;; If the doc string starts with "Non-nil means"
	     ;; (if (and (looking-at "\"\\*?Non-nil\\s-+means\\s-+")
	     ;;          (not (string-match "-flag$" (car fp))))
	     ;;     (let ((newname
	     ;;    	(if (string-match "-p$" (car fp))
	     ;;    	    (concat (substring (car fp) 0 -2) "-flag")
	     ;;    	  (concat (car fp) "-flag"))))
	     ;;       (if (checkdoc-y-or-n-p
	     ;;    	(format
	     ;;    	 "Rename to %s and Query-Replace all occurrences? "
	     ;;    	 newname))
	     ;;           (progn
	     ;;    	 (beginning-of-defun)
	     ;;    	 (query-replace-regexp
	     ;;    	  (concat "\\<" (regexp-quote (car fp)) "\\>")
	     ;;    	  newname))
	     ;;         (checkdoc-create-error
	     ;;          "Flag variable names should normally end in `-flag'" s
	     ;;          (marker-position e)))))
	     ;; Done with variables
	     ))
	   (t
	    ;; This if we are in a function definition
	    (or
	     ;; * When a function's documentation string mentions the value
	     ;;   of an argument of the function, use the argument name in
	     ;;   capital letters as if it were a name for that value.  Thus,
	     ;;   the documentation string of the function `/' refers to its
	     ;;   second argument as `DIVISOR', because the actual argument
	     ;;   name is `divisor'.

	     ;;   Addendum:  Make sure they appear in the doc in the same
	     ;;              order that they are found in the arg list.
	     (let ((args (nthcdr 4 fp))
		   (last-pos 0)
		   (found 1)
		   (order (and (nth 3 fp) (car (nth 3 fp))))
		   (nocheck (append '("&optional" "&rest") (nth 3 fp)))
		   (inopts nil))
	       (while (and args found (> found last-pos))
                 (if (or (member (car args) nocheck)
                         (string-match "\\`_" (car args)))
		     (setq args (cdr args)
			   inopts t)
		   (setq last-pos found
			 found (save-excursion
				 (re-search-forward
				  (concat "\\<" (upcase (car args))
					  ;; Require whitespace OR
					  ;; ITEMth<space> OR
					  ;; ITEMs<space>
					  "\\(\\>\\|th\\>\\|s\\>\\|[.,;:]\\)")
				  e t)))
		   (if (not found)
		       (let ((case-fold-search t))
			 ;; If the symbol was not found, let's see if we
			 ;; can find it with a different capitalization
			 ;; and see if the user wants to capitalize it.
			 (if (save-excursion
			       (re-search-forward
				(concat "\\<\\(" (car args)
					;; Require whitespace OR
					;; ITEMth<space> OR
					;; ITEMs<space>
					"\\)\\(\\>\\|th\\>\\|s\\>\\)")
				e t))
			     (if (checkdoc-autofix-ask-replace
				  (match-beginning 1) (match-end 1)
				  (format-message
				   "If this is the argument `%s', it should appear as %s.  Fix? "
				   (car args) (upcase (car args)))
				  (upcase (car args)) t)
				 (setq found (match-beginning 1))))))
		   (if found (setq args (cdr args)))))
	       (if (not found)
		   ;; It wasn't found at all!  Offer to attach this new symbol
		   ;; to the end of the documentation string.
		   (if (checkdoc-y-or-n-p
			(format
			 "Add %s documentation to end of doc string? "
			 (upcase (car args))))
		       ;; Now do some magic and invent a doc string.
		       (save-excursion
			 (goto-char e) (forward-char -1)
			 (insert "\n"
				 (if inopts "Optional a" "A")
				 "rgument " (upcase (car args))
				 " ")
			 (insert (read-string "Describe: "))
			 (if (not (save-excursion (forward-char -1)
						  (looking-at "[.?!]")))
			     (insert "."))
			 nil)
		     (checkdoc-create-error
		      (format-message
		       "Argument `%s' should appear (as %s) in the doc string"
		       (car args) (upcase (car args)))
		      s (marker-position e)))
		 (if (or (and order (eq order 'yes))
			 (and (not order) checkdoc-arguments-in-order-flag))
		     (if (< found last-pos)
			 (checkdoc-create-error
			  "Arguments occur in the doc string out of order"
			  s (marker-position e) t)))))
	     ;; * For consistency, phrase the verb in the first sentence of a
	     ;;   documentation string for functions as an imperative.
	     ;;   For instance, use `Return the cons of A and
	     ;;   B.' in preference to `Returns the cons of A and B.'
	     ;;   Usually it looks good to do likewise for the rest of the
	     ;;   first paragraph.  Subsequent paragraphs usually look better
	     ;;   if they have proper subjects.
	     ;;
	     ;; This is the least important of the above tests.  Make sure
	     ;; it occurs last.
	     (and checkdoc-verb-check-experimental-flag
		  (save-excursion
		    ;; Maybe rebuild the monster-regexp
		    (checkdoc-create-common-verbs-regexp)
		    (let ((lim (save-excursion
				 (end-of-line)
				 ;; check string-continuation
				 (if (eq (preceding-char) ?\\)
				     (line-end-position 2)
				   (point))))
			  (rs nil) replace original (case-fold-search t))
		      (while (and (not rs)
				  (re-search-forward
				   checkdoc-common-verbs-regexp
				   lim t))
			(setq original (buffer-substring-no-properties
					(match-beginning 1) (match-end 1))
			      rs (assoc (downcase original)
					checkdoc-common-verbs-wrong-voice))
			(if (not rs) (error "Verb voice alist corrupted"))
			(setq replace (let ((case-fold-search nil))
					(if (string-match-p "^[A-Z]" original)
					    (capitalize (cdr rs))
					  (cdr rs))))
			(if (checkdoc-autofix-ask-replace
			     (match-beginning 1) (match-end 1)
			     (format "Use the imperative for \"%s\".  \
Replace with \"%s\"? " original replace)
			     replace t)
			    (setq rs nil)))
		      (if rs
			  ;; there was a match, but no replace
			  (checkdoc-create-error
			   (format
			    "Probably \"%s\" should be imperative \"%s\""
			    original replace)
			   (match-beginning 1) (match-end 1))))))
	     ;; "Return true ..." should be "Return non-nil ..."
	     (when (looking-at "\"Return \\(true\\)\\b")
               (if (checkdoc-autofix-ask-replace
                    (match-beginning 1) (match-end 1)
                    "Say \"non-nil\" instead of \"true\"? "
                    "non-nil")
                   nil
                 (checkdoc-create-error
                  "\"true\" should usually be \"non-nil\""
                  (match-beginning 1) (match-end 1))))
	     ;; Done with functions
	     )))
     ;;* When a documentation string refers to a Lisp symbol, write it as
     ;;  it would be printed (which usually means in lower case), with
     ;;  single-quotes around it.  For example: ‘lambda’.  There are two
     ;;  exceptions: write t and nil without single-quotes.  (For
     ;;  compatibility with an older Emacs style, quoting with ` and '
     ;;  also works, e.g., `lambda' is treated like ‘lambda’.)
     (save-excursion
       (let ((found nil) (start (point)) (msg nil) (ms nil))
	 (while (and (not msg)
		     (re-search-forward
		      ;; Ignore manual page references like
		      ;; git-config(1).
		      "[^-([`'‘’:a-zA-Z]\\(\\w+[:-]\\(\\w\\|\\s_\\)+\\)[^]('’]"
		      e t))
	   (setq ms (match-string 1))
	   ;; A . is a \s_ char, so we must remove periods from
	   ;; sentences more carefully.
	   (when (string-match-p "\\.$" ms)
	     (setq ms (substring ms 0 (1- (length ms)))))
	   (if (and (not (checkdoc-in-sample-code-p start e))
		    (not (checkdoc-in-example-string-p start e))
		    (not (member ms checkdoc-symbol-words))
		    (setq found (intern-soft ms))
		    (or (boundp found) (fboundp found)))
	       (progn
		 (setq msg (format-message
                            "Add quotes around Lisp symbol `%s'? " ms))
		 (if (checkdoc-autofix-ask-replace
		      (match-beginning 1) (+ (match-beginning 1)
					     (length ms))
		      msg (format-message "`%s'" ms) t)
		     (setq msg nil)
		   (setq msg
			 (format-message
                          "Lisp symbol `%s' should appear in quotes" ms))))))
	 (if msg
	     (checkdoc-create-error msg (match-beginning 1)
				    (+ (match-beginning 1)
				       (length ms)))
	   nil)))
     ;; t and nil case
     (save-excursion
       (if (re-search-forward "\\([`‘]\\(t\\|nil\\)['’]\\)" e t)
	   (if (checkdoc-autofix-ask-replace
		(match-beginning 1) (match-end 1)
		(format "%s should not appear in quotes.  Remove? "
			(match-string 2))
		(match-string 2) t)
	       nil
	     (checkdoc-create-error
	      "Symbols t and nil should not appear in single quotes"
	      (match-beginning 1) (match-end 1)))))
     ;; Here is some basic sentence formatting
     (checkdoc-sentencespace-region-engine (point) e)
     ;; Here are common proper nouns that should always appear capitalized.
     (checkdoc-proper-noun-region-engine (point) e)
     ;; Make sure the doc string has correctly spelled English words
     ;; in it.  This function is extracted due to its complexity,
     ;; and reliance on the Ispell program.
     (checkdoc-ispell-docstring-engine e)
     ;; User supplied checks
     (save-excursion (checkdoc-run-hooks 'checkdoc-style-functions fp e))
     ;; Done!
     )))

(defun checkdoc-defun-info nil
  "Return a list of details about the current sexp.
It is a list of the form:
   (NAME VARIABLE INTERACTIVE NODOCPARAMS PARAMETERS ...)
where NAME is the name, VARIABLE is t if this is a `defvar',
INTERACTIVE is nil if this is not an interactive function, otherwise
it is the position of the `interactive' call, and PARAMETERS is a
string which is the name of each variable in the function's argument
list.  The NODOCPARAMS is a sublist of parameters specified by a checkdoc
comment for a given defun.  If the first element is not a string, then
the token checkdoc-order: <TOKEN> exists, and TOKEN is a symbol read
from the comment."
  (save-excursion
    (beginning-of-defun)
    (let ((defun (looking-at "(def\\(un\\|macro\\|subst\\|advice\\)"))
	  (is-advice (looking-at "(defadvice"))
	  (lst nil)
	  (ret nil)
	  (oo (make-vector 3 0)))	;substitute obarray for `read'
      (forward-char 1)
      (forward-sexp 1)
      (skip-chars-forward " \n\t")
      (setq ret
	    (list (buffer-substring-no-properties
		   (point) (progn (forward-sexp 1) (point)))))
      (if (not defun)
	  (setq ret (cons t ret))
	;; The variable spot
	(setq ret (cons nil ret))
	;; Interactive
	(save-excursion
	  (setq ret (cons
		     (re-search-forward "^\\s-*(interactive"
					(save-excursion (end-of-defun) (point))
					t)
		     ret)))
	(skip-chars-forward " \t\n")
	(let ((bss (buffer-substring (point) (save-excursion (forward-sexp 1)
							     (point))))
	      ;; Overload th main obarray so read doesn't intern the
	      ;; local symbols of the function we are checking.
	      ;; Without this we end up cluttering the symbol space w/
	      ;; useless symbols.
	      (obarray oo))
	  ;; Ok, check for checkdoc parameter comment here
	  (save-excursion
	    (setq ret
		  (cons
		   (let ((sl1 nil))
		     (if (re-search-forward ";\\s-+checkdoc-order:\\s-+"
					    (save-excursion (end-of-defun)
							    (point))
					    t)
			 (setq sl1 (list (cond ((looking-at "nil") 'no)
					       ((looking-at "t") 'yes)))))
		     (if (re-search-forward ";\\s-+checkdoc-params:\\s-+"
					    (save-excursion (end-of-defun)
							    (point))
					    t)
			 (let ((sl nil))
			   (goto-char (match-end 0))
			   (condition-case nil
			       (setq lst (read (current-buffer)))
			     (error (setq lst nil))) ; error in text
                           (if (not (listp lst)) ; not a list of args
                               (setq lst (list lst)))
			   (if (and lst (not (symbolp (car lst)))) ;weird arg
			       (setq lst nil))
			   (while lst
			     (setq sl (cons (symbol-name (car lst)) sl)
				   lst (cdr lst)))
			   (setq sl1 (append sl1 sl))))
		     sl1)
		   ret)))
	  ;; Read the list of parameters, but do not put the symbols in
	  ;; the standard obarray.
	  (setq lst (read bss)))
	;; This is because read will intern nil if it doesn't into the
	;; new obarray.
	(if (not (listp lst)) (setq lst nil))
	(if is-advice nil
	  (while lst
	    (setq ret (cons (symbol-name (car lst)) ret)
		  lst (cdr lst)))))
      (nreverse ret))))

(defun checkdoc-in-sample-code-p (start limit)
  "Return non-nil if the current point is in a code fragment.
A code fragment is identified by an open parenthesis followed by a
symbol which is a valid function or a word in all CAPS, or a parenthesis
that is quoted with the \\=' character.  Only the region from START to LIMIT
is allowed while searching for the bounding parenthesis."
  (save-match-data
    (save-restriction
      (narrow-to-region start limit)
      (save-excursion
	(and (condition-case nil (progn (up-list 1) t) (error nil))
	     (condition-case nil (progn (forward-list -1) t) (error nil))
	     (or (save-excursion (forward-char -1) (looking-at "'("))
		 (and (looking-at "(\\(\\(\\w\\|[-:_]\\)+\\)[ \t\n;]")
		      (let ((ms (buffer-substring-no-properties
				 (match-beginning 1) (match-end 1))))
			;; if this string is function bound, we are in
			;; sample code.  If it has a - or : character in
			;; the name, then it is probably supposed to be bound
			;; but isn't yet.
			(or (fboundp (intern-soft ms))
			    (let ((case-fold-search nil))
			      (string-match "^[A-Z-]+$" ms))
			    (string-match "\\w[-:_]+\\w" ms))))))))))

(defun checkdoc-in-example-string-p (start limit)
  "Return non-nil if the current point is in an \"example string\".
This string is identified by the characters \\\" surrounding the text.
The text checked is between START and LIMIT."
  (save-match-data
    (save-excursion
      (let ((p (point))
	    (c 0))
	(goto-char start)
	(while (and (< (point) p) (re-search-forward "\\\\\"" limit t))
	  (setq c (1+ c)))
	(and (< 0 c) (= (% c 2) 0))))))

(defun checkdoc-proper-noun-region-engine (begin end)
  "Check all text between BEGIN and END for lower case proper nouns.
These are Emacs centric proper nouns which should be capitalized for
consistency.  Return an error list if any are not fixed, but
internally skip over no answers.
If the offending word is in a piece of quoted text, then it is skipped."
  (save-excursion
    (let ((case-fold-search nil)
	  (errtxt nil) bb be)
      (with-syntax-table checkdoc-syntax-table
        (goto-char begin)
        (while (re-search-forward checkdoc-proper-noun-regexp end t)
          (let ((text (match-string 1))
                (b (match-beginning 1))
                (e (match-end 1)))
            (if (and (not (save-excursion
                            (goto-char b)
                            (forward-char -1)
                            (looking-at "[`\".‘]\\|\\\\")))
                     ;; surrounded by /, as in a URL or filename: /emacs/
                     (not (and (= ?/ (char-after e))
                               (= ?/ (char-before b))))
                     (not (checkdoc-in-example-string-p begin end))
                     ;; info or url links left alone
                     (not (thing-at-point-looking-at
                           help-xref-info-regexp))
                     (not (thing-at-point-looking-at
                           help-xref-url-regexp)))
                (if (checkdoc-autofix-ask-replace
                     b e (format "Text %s should be capitalized.  Fix? "
                                 text)
                     (capitalize text) t)
                    nil
                  (if errtxt
                      ;; If there is already an error, then generate
                      ;; the warning output if applicable
                      (if checkdoc-generate-compile-warnings-flag
                          (checkdoc-create-error
                           (format
                            "Name %s should appear capitalized as %s"
                            text (capitalize text))
                           b e))
                    (setq errtxt
                          (format
                           "Name %s should appear capitalized as %s"
                           text (capitalize text))
                          bb b be e)))))))
      (if errtxt (checkdoc-create-error errtxt bb be)))))

(defun checkdoc-sentencespace-region-engine (begin end)
  "Make sure all sentences have double spaces between BEGIN and END."
  (if sentence-end-double-space
      (save-excursion
	(let ((case-fold-search nil)
	      (errtxt nil) bb be)
	  (with-syntax-table checkdoc-syntax-table
            (goto-char begin)
            (while (re-search-forward "[^ .0-9]\\(\\. \\)[^ \n]" end t)
              (let ((b (match-beginning 1))
                    (e (match-end 1)))
                (unless (or (checkdoc-in-sample-code-p begin end)
                            (checkdoc-in-example-string-p begin end)
                            (save-excursion
                              (goto-char b)
                              (condition-case nil
                                  (progn
                                    (forward-sexp -1)
                                    ;; piece of an abbreviation
                                    ;; FIXME etc
                                    (looking-at
                                     "\\([a-zA-Z]\\|[iI]\\.?e\\|[eE]\\.?g\\)\\."))
                                (error t))))
                  (if (checkdoc-autofix-ask-replace
                       b e
                       "There should be two spaces after a period.  Fix? "
                       ".  ")
                      nil
                    (if errtxt
                        ;; If there is already an error, then generate
                        ;; the warning output if applicable
                        (if checkdoc-generate-compile-warnings-flag
                            (checkdoc-create-error
                             "There should be two spaces after a period"
                             b e))
                      (setq errtxt
                            "There should be two spaces after a period"
                            bb b be e)))))))
	  (if errtxt (checkdoc-create-error errtxt bb be))))))

;;; Ispell engine
;;
(defvar ispell-process)
(declare-function ispell-buffer-local-words "ispell" ())

(defun checkdoc-ispell-init ()
  "Initialize Ispell process (default version) with Lisp words.
The words used are from `checkdoc-ispell-lisp-words'.  If `ispell'
cannot be loaded, then set `checkdoc-spellcheck-documentation-flag' to
nil."
  (require 'ispell)
  (unless ispell-process
    (condition-case nil
	(progn
	  (ispell-buffer-local-words)
	  ;; This code copied in part from ispell.el Emacs 19.34
	  (dolist (w checkdoc-ispell-lisp-words)
	    (process-send-string ispell-process (concat "@" w "\n"))))
      (error (setq checkdoc-spellcheck-documentation-flag nil)))))

(defun checkdoc-ispell-docstring-engine (end)
  "Run the Ispell tools on the doc string between point and END.
Since Ispell isn't Lisp-smart, we must pre-process the doc string
before using the Ispell engine on it."
  (if (or (not checkdoc-spellcheck-documentation-flag)
	  ;; If the user wants no questions or fixing, then we must
	  ;; disable spell checking as not useful.
	  (not checkdoc-autofix-flag)
	  (eq checkdoc-autofix-flag 'never))
      nil
    (checkdoc-ispell-init)
    (save-excursion
      (skip-chars-forward "^a-zA-Z")
      (let ((word nil) (sym nil) (case-fold-search nil) (err nil))
	(while (and (not err) (< (point) end))
	  (if (save-excursion (forward-char -1) (looking-at "[('`]"))
	      ;; Skip lists describing meta-syntax, or bound variables
	      (forward-sexp 1)
	    (setq word (buffer-substring-no-properties
			(point) (progn
				  (skip-chars-forward "a-zA-Z-")
				  (point)))
		  sym (intern-soft word))
	    (if (and sym (or (boundp sym) (fboundp sym)))
		;; This is probably repetitive in most cases, but not always.
		nil
	      ;; Find out how we spell-check this word.
	      (if (or
		   ;; All caps w/ option th, or s tacked on the end
		   ;; for pluralization or number.
		   (string-match "^[A-Z][A-Z]+\\(s\\|th\\)?$" word)
		   (looking-at "}") ; a keymap expression
		   )
		  nil
		(save-excursion
		  (if (not (eq checkdoc-autofix-flag 'never))
		      (let ((lk last-input-event))
			(ispell-word nil t)
			(if (not (equal last-input-event lk))
			    (progn
			      (sit-for 0)
			      (message "Continuing..."))))
		    ;; Nothing here.
		    )))))
	  (skip-chars-forward "^a-zA-Z"))
	err))))

;;; Rogue space checking engine
;;
(defun checkdoc-rogue-space-check-engine (&optional start end interact)
  "Return a message list if there is a line with white space at the end.
If `checkdoc-autofix-flag' permits, delete that whitespace instead.
If optional arguments START and END are non-nil, bound the check to
this region.
Optional argument INTERACT may permit the user to fix problems on the fly."
  (let ((p (point))
	(msg nil) s e (f nil))
    (if (not start) (setq start (point-min)))
    ;; If end is nil, it means end of buffer to search anyway
    (or
     ;; Check for an error if `? ' or `?\ ' is used at the end of a line.
     ;; (It's dangerous)
     (progn
       (goto-char start)
       (while (and (not msg) (re-search-forward "\\?\\\\?[ \t][ \t]*$" end t))
	 (setq msg
	       "Don't use `? ' at the end of a line. \
News agents may remove it"
	       s (match-beginning 0) e (match-end 0) f t)
	 ;; If interactive is passed down, give them a chance to fix things.
	 (if (and interact (y-or-n-p (concat msg ". Fix? ")))
	     (progn
	       (checkdoc-recursive-edit msg)
	       (setq msg nil)
	       (goto-char s)
	       (beginning-of-line)))))
     ;; Check for, and potentially remove whitespace appearing at the
     ;; end of different lines.
     (progn
       (goto-char start)
       ;; There is no documentation in the Emacs Lisp manual about this check,
       ;; it is intended to help clean up messy code and reduce the file size.
       (while (and (not msg) (re-search-forward "[^ \t\n;]\\([ \t]+\\)$" end t))
	 ;; This is not a complex activity
	 (if (checkdoc-autofix-ask-replace
	      (match-beginning 1) (match-end 1)
	      "White space at end of line.  Remove? " "")
	     nil
	   (setq msg "White space found at end of line"
		 s (match-beginning 1) e (match-end 1))))))
    ;; Return an error and leave the cursor at that spot, or restore
    ;; the cursor.
    (if msg
	(checkdoc-create-error msg s e f)
      (goto-char p)
      nil)))

;;; Comment checking engine
;;
(defvar generate-autoload-cookie)

(eval-when-compile (require 'lisp-mnt))	; expand silly defsubsts
(declare-function lm-summary "lisp-mnt" (&optional file))
(declare-function lm-section-start "lisp-mnt" (header &optional after))
(declare-function lm-section-end "lisp-mnt" (header))

(defun checkdoc-file-comments-engine ()
  "Return a message list if this file does not match the Emacs standard.
This checks for style only, such as the first line, Commentary:,
Code:, and others referenced in the style guide."
  (if (featurep 'lisp-mnt)
      nil
    (require 'lisp-mnt)
    ;; Old XEmacs don't have `lm-commentary-mark'
    (if (and (not (fboundp 'lm-commentary-mark)) (fboundp 'lm-commentary))
	(defalias 'lm-commentary-mark #'lm-commentary)))
  (save-excursion
    (let* ((f1 (file-name-nondirectory (buffer-file-name)))
	   (fn (file-name-sans-extension f1))
	   (fe (substring f1 (length fn)))
	   (err nil))
      (goto-char (point-min))
      ;; This file has been set up where ERR is a variable.  Each check is
      ;; asked, and the function will make sure that if the user does not
      ;; auto-fix some error, that we still move on to the next auto-fix,
      ;; AND we remember the past errors.
      (setq
       err
       ;; Lisp Maintenance checks first
       ;; Was: (lm-verify) -> not flexible enough for some people
       ;; * Summary at the beginning of the file:
       (if (not (lm-summary))
	   ;; This certifies as very complex so always ask unless
	   ;; it's set to never
	   (if (checkdoc-y-or-n-p "There is no first line summary!  Add one? ")
	       (progn
		 (goto-char (point-min))
		 (insert ";;; " fn fe " --- " (read-string "Summary: ") "\n"))
	     (checkdoc-create-error
	      "The first line should be of the form: \";;; package --- Summary\""
	      (point-min) (save-excursion (goto-char (point-min))
					  (line-end-position))))
	 nil))
      (setq
       err
       (or
	;; * Commentary Section
	(if (not (lm-commentary-mark))
	    (progn
	      (goto-char (point-min))
	      (cond
	       ((re-search-forward
		 "write\\s-+to\\s-+the\\s-+Free Software Foundation, Inc."
		 nil t)
		(re-search-forward "^;;\\s-*\n\\|^\n" nil t))
	       ((or (re-search-forward "^;;; History" nil t)
		    (re-search-forward "^;;; Code" nil t)
		    (re-search-forward "^(require" nil t)
		    (re-search-forward "^(" nil t))
		(beginning-of-line))
	       (t (re-search-forward ";;; .* --- .*\n")))
	      (if (checkdoc-y-or-n-p
		   "You should have a \";;; Commentary:\", add one? ")
		  (insert "\n;;; Commentary:\n;; \n\n")
		(checkdoc-create-error
		 "You should have a section marked \";;; Commentary:\""
		 nil nil t)))
	  nil)
	err))
      (setq
       err
       (or
	;; * History section.  Say nothing if there is a file ChangeLog
	(if (or (not checkdoc-force-history-flag)
		(file-exists-p "ChangeLog")
		(file-exists-p "../ChangeLog")
                (and (fboundp 'lm-history-mark) (funcall #'lm-history-mark)))
	    nil
	  (progn
	    (goto-char (or (lm-commentary-mark) (point-min)))
	    (cond
	     ((re-search-forward
	       "write\\s-+to\\s-+the\\s-+Free Software Foundation, Inc."
	       nil t)
	      (re-search-forward "^;;\\s-*\n\\|^\n" nil t))
	     ((or (re-search-forward "^;;; Code" nil t)
		  (re-search-forward "^(require" nil t)
		  (re-search-forward "^(" nil t))
	      (beginning-of-line)))
	    (if (checkdoc-y-or-n-p
		 "You should have a \";;; History:\", add one? ")
		(insert "\n;;; History:\n;; \n\n")
	      (checkdoc-create-error
	       "You should have a section marked \";;; History:\" or use a ChangeLog"
	       (point) nil))))
	err))
      (setq
       err
       (or
	;; * Code section
	(if (not (lm-code-mark))
	    (let ((cont t)
		  pos)
	      (goto-char (point-min))
	      ;; match ";;;###autoload" cookie to keep it with the form
	      (require 'autoload)
	      (while (and cont (re-search-forward
				(concat "^\\("
					(regexp-quote generate-autoload-cookie)
					"\n\\)?"
					"(")
				nil t))
		(setq pos (match-beginning 0)
		      cont (looking-at "require\\s-+")))
	      (if (and (not cont)
		       (checkdoc-y-or-n-p
			"There is no ;;; Code: marker.  Insert one? "))
		  (progn (goto-char pos)
			 (insert ";;; Code:\n\n")
			 nil)
		(checkdoc-create-error
		 "You should have a section marked \";;; Code:\""
		 (point) nil)))
	  nil)
	err))
      (setq
       err
       (or
	;; * A footer.  Not compartmentalized from lm-verify: too bad.
	;;              The following is partially clipped from lm-verify
	(save-excursion
	  (goto-char (point-max))
	  (if (not (re-search-backward
		    (concat "^;;;[ \t]+" (regexp-quote fn) "\\(" (regexp-quote fe)
			    "\\)?[ \t]+ends here[ \t]*$"
			    "\\|^;;;[ \t]+ End of file[ \t]+"
			    (regexp-quote fn) "\\(" (regexp-quote fe) "\\)?")
		    nil t))
	      (if (checkdoc-y-or-n-p "No identifiable footer!  Add one? ")
		  (progn
		    (goto-char (point-max))
		    (insert "\n(provide '" fn ")\n\n;;; " fn fe " ends here\n"))
		(checkdoc-create-error
		 (format "The footer should be: (provide '%s)\\n;;; %s%s ends here"
			 fn fn fe)
		 (1- (point-max)) (point-max)))))
	err))
      ;; The below checks will not return errors if the user says NO

      ;; Let's spellcheck the commentary section.  This is the only
      ;; section that is easy to pick out, and it is also the most
      ;; visible section (with the finder).
      (let ((cm (lm-commentary-mark)))
        (when cm
          (save-excursion
            (goto-char cm)
            (let ((e (copy-marker (lm-commentary-end))))
              ;; Since the comments talk about Lisp, use the
              ;; specialized spell-checker we also used for doc
              ;; strings.
              (checkdoc-sentencespace-region-engine (point) e)
              (checkdoc-proper-noun-region-engine (point) e)
              (checkdoc-ispell-docstring-engine e)))))
      (setq
       err
       (or
	;; Generic Full-file checks (should be comment related)
	(checkdoc-run-hooks 'checkdoc-comment-style-functions)
	err))
      ;; Done with full file comment checks
      err)))

(defun checkdoc-outside-major-sexp ()
  "Return t if point is outside the bounds of a valid sexp."
  (save-match-data
    (save-excursion
      (let ((p (point)))
	(or (progn (beginning-of-defun) (bobp))
	    (progn (end-of-defun) (< (point) p)))))))

;;; `error' and `message' text verifier.
;;
(defun checkdoc-message-text-search (&optional beg end)
  "Search between BEG and END for a style error with message text.
Optional arguments BEG and END represent the boundary of the check.
The default boundary is the entire buffer."
  (let ((e nil)
	(type nil))
    (if (not (or beg end)) (setq beg (point-min) end (point-max)))
    (goto-char beg)
    (while (setq type (checkdoc-message-text-next-string end))
      (setq e (checkdoc-message-text-engine type)))
    e))

(defun checkdoc-message-text-next-string (end)
  "Move cursor to the next checkable message string after point.
Return the message classification.
Argument END is the maximum bounds to search in."
  (let ((return nil))
    (while (and (not return)
		(re-search-forward
		 "(\\s-*\\(\\(\\w\\|\\s_\\)*error\\|\
\\(\\w\\|\\s_\\)*y-or-n-p\\(-with-timeout\\)?\
\\|checkdoc-autofix-ask-replace\\)[ \t\n]+" end t))
      (let* ((fn (match-string 1))
	     (type (cond ((string-match "error" fn)
			  'error)
			 (t 'y-or-n-p))))
	(if (string-match "checkdoc-autofix-ask-replace" fn)
	    (progn (forward-sexp 2)
		   (skip-chars-forward " \t\n")))
	(if (and (eq type 'y-or-n-p)
		 (looking-at "(format[ \t\n]+"))
	    (goto-char (match-end 0)))
	(skip-chars-forward " \t\n")
	(if (not (looking-at "\""))
	    nil
	  (setq return type))))
    return))

(defun checkdoc-message-text-engine (&optional type)
  "Return or fix errors found in strings passed to a message display function.
According to the documentation for the function `error', the error list
should not end with a period, and should start with a capital letter.
The function `y-or-n-p' has similar constraints.
Argument TYPE specifies the type of question, such as `error' or `y-or-n-p'."
  ;; If type is nil, then attempt to derive it.
  (if (not type)
      (save-excursion
	(up-list -1)
	(if (looking-at "(format")
	    (up-list -1))
	(setq type
	      (cond ((looking-at "(error")
		     'error)
		    (t 'y-or-n-p)))))
  (let ((case-fold-search nil))
    (or
     ;; From the documentation of the symbol `error':
     ;; In Emacs, the convention is that error messages start with a capital
     ;; letter but *do not* end with a period.  Please follow this convention
     ;; for the sake of consistency.
     (if (and (save-excursion (forward-char 1)
			      (looking-at "[a-z]\\w+"))
	      (not (checkdoc-autofix-ask-replace
		    (match-beginning 0) (match-end 0)
		    "Capitalize your message text? "
		    (capitalize (match-string 0))
		    t)))
	 (checkdoc-create-error
	  "Messages should start with a capital letter"
	  (match-beginning 0) (match-end 0))
       nil)
     ;; In general, sentences should have two spaces after the period.
     (checkdoc-sentencespace-region-engine (point)
					   (save-excursion (forward-sexp 1)
							   (point)))
     ;; Look for proper nouns in this region too.
     (checkdoc-proper-noun-region-engine (point)
					 (save-excursion (forward-sexp 1)
							 (point)))
     ;; Here are message type specific questions.
     (if (and (eq type 'error)
	      (save-excursion (forward-sexp 1)
			      (forward-char -2)
			      (looking-at "\\."))
	      (not (checkdoc-autofix-ask-replace (match-beginning 0)
						 (match-end 0)
						 "Remove period from error? "
						 ""
						 t)))
	 (checkdoc-create-error
	  "Error messages should *not* end with a period"
	  (match-beginning 0) (match-end 0))
       nil)
     ;; `y-or-n-p' documentation explicitly says:
     ;; It should end in a space; `y-or-n-p' adds `(y or n) ' to it.
     ;; I added the ? requirement.  Without it, it is unclear that we
     ;; ask a question and it appears to be an undocumented style.
     (if (eq type 'y-or-n-p)
	 (if (not (save-excursion (forward-sexp 1)
				  (forward-char -3)
				  (not (looking-at "\\? "))))
	     nil
	   (if (save-excursion (forward-sexp 1)
			       (forward-char -2)
			       (looking-at "\\?"))
	       ;; If we see a ?, then replace with "? ".
	       (if (checkdoc-autofix-ask-replace
		    (match-beginning 0) (match-end 0)
                    (format-message
                     "`y-or-n-p' argument should end with \"? \".  Fix? ")
		    "? " t)
		   nil
		 (checkdoc-create-error
		  "`y-or-n-p' argument should end with \"? \""
		  (match-beginning 0) (match-end 0)))
	     (if (save-excursion (forward-sexp 1)
				 (forward-char -2)
				 (looking-at " "))
		 (if (checkdoc-autofix-ask-replace
		      (match-beginning 0) (match-end 0)
                      (format-message
                       "`y-or-n-p' argument should end with \"? \".  Fix? ")
		      "? " t)
		     nil
		   (checkdoc-create-error
		    "`y-or-n-p' argument should end with \"? \""
		    (match-beginning 0) (match-end 0)))
	       (if (and ;; if this isn't true, we have a problem.
		    (save-excursion (forward-sexp 1)
				    (forward-char -1)
				    (looking-at "\""))
		    (checkdoc-autofix-ask-replace
		     (match-beginning 0) (match-end 0)
                     (format-message
                      "`y-or-n-p' argument should end with \"? \".  Fix? ")
		     "? \"" t))
		   nil
		 (checkdoc-create-error
		  "`y-or-n-p' argument should end with \"? \""
		  (match-beginning 0) (match-end 0)))))))
     ;; Now, let's just run the spell checker on this guy.
     (checkdoc-ispell-docstring-engine (save-excursion (forward-sexp 1)
						       (point)))
     )))

;;; Auto-fix helper functions
;;
(defun checkdoc-y-or-n-p (question)
  "Like `y-or-n-p', but pays attention to `checkdoc-autofix-flag'.
Argument QUESTION is the prompt passed to `y-or-n-p'."
  (prog1
      (if (or (not checkdoc-autofix-flag)
	      (eq checkdoc-autofix-flag 'never))
	  nil
	(y-or-n-p question))
    (if (eq checkdoc-autofix-flag 'automatic-then-never)
	(setq checkdoc-autofix-flag 'never))))

(defun checkdoc-autofix-ask-replace (start end question replacewith
					   &optional complex)
  "Highlight between START and END and queries the user with QUESTION.
If the user says yes, or if `checkdoc-autofix-flag' permits, replace
the region marked by START and END with REPLACEWITH.  If optional flag
COMPLEX is non-nil, then we may ask the user a question.  See the
documentation for `checkdoc-autofix-flag' for details.

If a section is auto-replaced without asking the user, this function
will pause near the fixed code so the user will briefly see what
happened.

This function returns non-nil if the text was replaced.

This function will not modify `match-data'."
  (if (and checkdoc-autofix-flag
	   (not (eq checkdoc-autofix-flag 'never)))
      (let ((o (make-overlay start end))
	    (ret nil)
	    (md (match-data)))
	(unwind-protect
	    (progn
	      (overlay-put o 'face 'highlight)
	      (if (or (eq checkdoc-autofix-flag 'automatic)
		      (eq checkdoc-autofix-flag 'automatic-then-never)
		      (and (eq checkdoc-autofix-flag 'semiautomatic)
			   (not complex))
		      (and (or (eq checkdoc-autofix-flag 'query) complex)
			   (y-or-n-p question)))
		  (save-excursion
		    (goto-char start)
		    ;; On the off chance this is automatic, display
		    ;; the question anyway so the user knows what's
		    ;; going on.
		    (if checkdoc-bouncy-flag (message "%s -> done" question))
		    (delete-region start end)
		    (insert replacewith)
		    (if checkdoc-bouncy-flag (sit-for 0))
		    (setq ret t)))
	      (delete-overlay o)
	      (set-match-data md))
	  (delete-overlay o)
	  (set-match-data md))
	(if (eq checkdoc-autofix-flag 'automatic-then-never)
	    (setq checkdoc-autofix-flag 'never))
	ret)))

;;; Warning management
;;
(defvar checkdoc-output-font-lock-keywords
  '(("^\\*\\*\\* \\(.+\\.el\\): \\([^ \n]+\\)"
     (1 font-lock-function-name-face)
     (2 font-lock-comment-face)))
  "Keywords used to highlight a checkdoc diagnostic buffer.")

(defvar checkdoc-output-error-regex-alist
  '(("^\\(.+\\.el\\):\\([0-9]+\\): " 1 2)))

(defvar checkdoc-pending-errors nil
  "Non-nil when there are errors that have not been displayed yet.")

(define-derived-mode checkdoc-output-mode compilation-mode "Checkdoc"
  "Set up the major mode for the buffer containing the list of errors."
  (setq-local compilation-error-regexp-alist
              checkdoc-output-error-regex-alist)
  (setq-local compilation-mode-font-lock-keywords
              checkdoc-output-font-lock-keywords))

(defun checkdoc-buffer-label ()
  "The name to use for a checkdoc buffer in the error list."
  (if (buffer-file-name)
      (file-relative-name (buffer-file-name))
    (concat "#<buffer "(buffer-name) ">")))

(defun checkdoc-start-section (check-type)
  "Initialize the checkdoc diagnostic buffer for a pass.
Create the header so that the string CHECK-TYPE is displayed as the
function called to create the messages."
  (let ((dir default-directory)
	(label (checkdoc-buffer-label)))
    (with-current-buffer (get-buffer-create checkdoc-diagnostic-buffer)
      (checkdoc-output-mode)
      (setq default-directory dir)
      (goto-char (point-max))
      (let ((inhibit-read-only t))
        (insert "\n\n\C-l\n*** " label ": "
                check-type " V " checkdoc-version)))))

(defun checkdoc-error (point msg)
  "Store POINT and MSG as errors in the checkdoc diagnostic buffer."
  (setq checkdoc-pending-errors t)
  (let ((text (list "\n" (checkdoc-buffer-label) ":"
                    (int-to-string
                     (count-lines (point-min) (or point (point-min))))
                    ": " msg)))
    (if (string= checkdoc-diagnostic-buffer "*warn*")
        (warn (apply #'concat text))
      (with-current-buffer (get-buffer checkdoc-diagnostic-buffer)
          (let ((inhibit-read-only t)
                (pt (point-max)))
            (goto-char pt)
            (apply #'insert text))))))

(defun checkdoc-show-diagnostics ()
  "Display the checkdoc diagnostic buffer in a temporary window."
  (if checkdoc-pending-errors
      (let* ((b (get-buffer checkdoc-diagnostic-buffer))
             (win (if b (display-buffer b))))
	(when win
          (with-selected-window win
            (goto-char (point-max))
            (re-search-backward "\C-l" nil t)
            (beginning-of-line)
            (forward-line 1)
            (recenter 0)))
	(setq checkdoc-pending-errors nil)
	nil)))

(defun checkdoc-get-keywords ()
  "Return a list of package keywords for the current file."
  (save-excursion
    (goto-char (point-min))
    (when (re-search-forward "^;; Keywords: \\(.*\\)$" nil t)
      (split-string (match-string-no-properties 1) ", " t))))

(defvar finder-known-keywords)

;;;###autoload
(defun checkdoc-package-keywords ()
  "Find package keywords that aren't in `finder-known-keywords'."
  (interactive)
  (require 'finder)
  (let ((unrecognized-keys
         (cl-remove-if
          (lambda (x) (assoc (intern-soft x) finder-known-keywords))
          (checkdoc-get-keywords))))
    (if unrecognized-keys
        (let* ((checkdoc-autofix-flag 'never)
               (checkdoc-generate-compile-warnings-flag t))
          (save-excursion
            (goto-char (point-min))
            (re-search-forward "^;; Keywords: \\(.*\\)$" nil t)
            (checkdoc-start-section "checkdoc-package-keywords")
            (checkdoc-create-error
             (concat "Unrecognized keywords: "
                     (mapconcat #'identity unrecognized-keys ", "))
             (match-beginning 1) (match-end 1)))
          (checkdoc-show-diagnostics))
      (when (called-interactively-p 'any)
        (message "No Package Keyword Errors.")))))

(custom-add-option 'emacs-lisp-mode-hook 'checkdoc-minor-mode)

(provide 'checkdoc)

;;; checkdoc.el ends here

debug log:

solving 300a3908c1 ...
found 300a3908c1 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 public inbox

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

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).