unofficial mirror of notmuch@notmuchmail.org
 help / color / mirror / code / Atom feed
blob 54cf00c6392128c10f45499b78a02ee7525de0ff 104390 bytes (raw)
name: emacs/notmuch-show.el 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
 
;;; notmuch-show.el --- displaying notmuch forests  -*- lexical-binding: t -*-
;;
;; Copyright © Carl Worth
;; Copyright © David Edmondson
;;
;; This file is part of Notmuch.
;;
;; Notmuch 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.
;;
;; Notmuch 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 Notmuch.  If not, see <https://www.gnu.org/licenses/>.
;;
;; Authors: Carl Worth <cworth@cworth.org>
;;          David Edmondson <dme@dme.org>

;;; Code:

(require 'mm-view)
(require 'message)
(require 'mm-decode)
(require 'mailcap)
(require 'icalendar)
(require 'goto-addr)

(require 'notmuch-lib)
(require 'notmuch-tag)
(require 'notmuch-wash)
(require 'notmuch-mua)
(require 'notmuch-crypto)
(require 'notmuch-print)
(require 'notmuch-draft)

(declare-function notmuch-call-notmuch-process "notmuch-lib" (&rest args))
(declare-function notmuch-search-next-thread "notmuch" nil)
(declare-function notmuch-search-previous-thread "notmuch" nil)
(declare-function notmuch-search-show-thread "notmuch")
(declare-function notmuch-foreach-mime-part "notmuch" (function mm-handle))
(declare-function notmuch-count-attachments "notmuch" (mm-handle))
(declare-function notmuch-save-attachments "notmuch" (mm-handle &optional queryp))
(declare-function notmuch-tree "notmuch-tree"
		  (&optional query query-context target buffer-name
			     open-target unthreaded parent-buffer))
(declare-function notmuch-tree-get-message-properties "notmuch-tree" nil)
(declare-function notmuch-unthreaded "notmuch-tree"
		  (&optional query query-context target buffer-name
			     open-target))
(declare-function notmuch-read-query "notmuch" (prompt))
(declare-function notmuch-draft-resume "notmuch-draft" (id))

(defvar shr-blocked-images)
(defvar gnus-blocked-images)
(defvar shr-content-function)
(defvar w3m-ignored-image-url-regexp)

;;; Options

(defcustom notmuch-message-headers '("Subject" "To" "Cc" "Date")
  "Headers that should be shown in a message, in this order.

For an open message, all of these headers will be made visible
according to `notmuch-message-headers-visible' or can be toggled
with `notmuch-show-toggle-visibility-headers'. For a closed message,
only the first header in the list will be visible."
  :type '(repeat string)
  :group 'notmuch-show)

(defcustom notmuch-message-headers-visible t
  "Should the headers be visible by default?

If this value is non-nil, then all of the headers defined in
`notmuch-message-headers' will be visible by default in the display
of each message. Otherwise, these headers will be hidden and
`notmuch-show-toggle-visibility-headers' can be used to make them
visible for any given message."
  :type 'boolean
  :group 'notmuch-show)

(defcustom notmuch-show-header-line t
  "Show a header line in notmuch show buffers.

If t (the default), the header line will contain the current
message's subject.

If a string, this value is interpreted as a format string to be
passed to `format-spec` with `%s` as the substitution variable
for the message's subject.  E.g., to display the subject trimmed
to a maximum of 80 columns, you could use \"%>-80s\" as format.

If you assign to this variable a function, it will be called with
the subject as argument, and the return value will be used as the
header line format.  Since the function is called with the
message buffer as the current buffer, it is also possible to
access any other properties of the message, using for instance
notmuch-show functions such as
`notmuch-show-get-message-properties'.

Finally, if this variable is set to nil, no header is
displayed."
  :type '(choice (const :tag "No header" ni)
                 (const :tag "Subject" t)
                 (string :tag "Format")
		 (function :tag "Function"))
  :group 'notmuch-show)

(defcustom notmuch-show-depth-limit nil
  "Depth beyond which message bodies are displayed lazily.

If bound to an integer, any message with tree depth greater than
this will have its body display lazily, initially
inserting only a button.

If this variable is set to nil (the default) no such lazy
insertion is done."
  :type '(choice (const :tag "No limit" nil)
                 (number :tag "Limit" 10))
  :group 'notmuch-show)

(defcustom notmuch-show-height-limit nil
  "Height (from leaves) beyond which message bodies are displayed lazily.

If bound to an integer, any message with height in the message
tree greater than this will have its body displayed lazily,
initially only a button.

If this variable is set to nil (the default) no such lazy
display is done."
  :type '(choice (const :tag "No limit" nil)
                 (number :tag "Limit" 10))
  :group 'notmuch-show)

(defcustom notmuch-show-relative-dates t
  "Display relative dates in the message summary line."
  :type 'boolean
  :group 'notmuch-show)

(defvar notmuch-show-markup-headers-hook '(notmuch-show-colour-headers)
  "A list of functions called to decorate the headers listed in
`notmuch-message-headers'.")

(defcustom notmuch-show-hook '(notmuch-show-turn-on-visual-line-mode)
  "Functions called after populating a `notmuch-show' buffer."
  :type 'hook
  :options '(notmuch-show-turn-on-visual-line-mode)
  :group 'notmuch-show
  :group 'notmuch-hooks)

(defcustom notmuch-show-insert-text/plain-hook
  '(notmuch-wash-wrap-long-lines
    notmuch-wash-tidy-citations
    notmuch-wash-elide-blank-lines
    notmuch-wash-excerpt-citations)
  "Functions used to improve the display of text/plain parts."
  :type 'hook
  :options '(notmuch-wash-convert-inline-patch-to-part
	     notmuch-wash-wrap-long-lines
	     notmuch-wash-tidy-citations
	     notmuch-wash-elide-blank-lines
	     notmuch-wash-excerpt-citations)
  :group 'notmuch-show
  :group 'notmuch-hooks)

(defcustom notmuch-show-max-text-part-size 100000
  "Maximum size of a text part to be shown by default in characters.

Set to 0 to show the part regardless of size."
  :type 'integer
  :group 'notmuch-show)

;; Mostly useful for debugging.
(defcustom notmuch-show-all-multipart/alternative-parts nil
  "Should all parts of multipart/alternative parts be shown?"
  :type 'boolean
  :group 'notmuch-show)

(defcustom notmuch-show-indent-messages-width 1
  "Width of message indentation in threads.

Messages are shown indented according to their depth in a thread.
This variable determines the width of this indentation measured
in number of blanks.  Defaults to `1', choose `0' to disable
indentation."
  :type 'integer
  :group 'notmuch-show)

(defcustom notmuch-show-indent-multipart nil
  "Should the sub-parts of a multipart/* part be indented?"
  ;; dme: Not sure which is a good default.
  :type 'boolean
  :group 'notmuch-show)

(defcustom notmuch-show-part-button-default-action 'notmuch-show-save-part
  "Default part header button action (on ENTER or mouse click)."
  :group 'notmuch-show
  :type '(choice (const :tag "Save part"
			notmuch-show-save-part)
		 (const :tag "View part"
			notmuch-show-view-part)
		 (const :tag "View interactively"
			notmuch-show-interactively-view-part)))

(defcustom notmuch-show-only-matching-messages nil
  "Only matching messages are shown by default."
  :type 'boolean
  :group 'notmuch-show)

;; By default, block all external images to prevent privacy leaks and
;; potential attacks.
(defcustom notmuch-show-text/html-blocked-images "."
  "Remote images that have URLs matching this regexp will be blocked."
  :type '(choice (const nil) regexp)
  :group 'notmuch-show)

;;; Variables

(defvar-local notmuch-show-thread-id nil)

(defvar-local notmuch-show-parent-buffer nil)

(defvar-local notmuch-show-query-context nil)

(defvar-local notmuch-show-process-crypto nil)

(defvar-local notmuch-show-elide-non-matching-messages nil)

(defvar-local notmuch-show-indent-content t)

(defvar-local notmuch-show-single-message nil)

(defvar notmuch-show-attachment-debug nil
  "If t log stdout and stderr from attachment handlers.

When set to nil (the default) stdout and stderr from attachment
handlers is discarded. When set to t the stdout and stderr from
each attachment handler is logged in buffers with names beginning
\" *notmuch-part*\".")

;;; Options

(defcustom notmuch-show-stash-mlarchive-link-alist
  '(("MARC" . "https://marc.info/?i=")
    ("Mail Archive, The" . "https://mid.mail-archive.com/")
    ("Lore" . "https://lore.kernel.org/r/")
    ("Notmuch" . "https://nmbug.notmuchmail.org/nmweb/show/")
    ;; FIXME: can these services be searched by `Message-Id' ?
    ;; ("MarkMail" . "http://markmail.org/")
    ;; ("Nabble" . "http://nabble.com/")
    ;; ("opensubscriber" . "http://opensubscriber.com/")
    )
  "List of Mailing List Archives to use when stashing links.

This list is used for generating a Mailing List Archive reference
URI with the current message's Message-Id in
`notmuch-show-stash-mlarchive-link'.

If the cdr of the alist element is not a function, the cdr is
expected to contain a URI that is concatenated with the current
message's Message-Id to create a ML archive reference URI.

If the cdr is a function, the function is called with the
Message-Id as the argument, and the function is expected to
return the ML archive reference URI."
  :type '(alist :key-type (string :tag "Name")
		:value-type (choice
			     (string :tag "URL")
			     (function :tag "Function returning the URL")))
  :group 'notmuch-show)

(defcustom notmuch-show-stash-mlarchive-link-default "MARC"
  "Default Mailing List Archive to use when stashing links.

This is used when `notmuch-show-stash-mlarchive-link' isn't
provided with an MLA argument nor `completing-read' input."
  :type `(choice
	  ,@(mapcar
	     (lambda (mla)
	       (list 'const :tag (car mla) :value (car mla)))
	     notmuch-show-stash-mlarchive-link-alist))
  :group 'notmuch-show)

(defcustom notmuch-show-mark-read-tags '("-unread")
  "List of tag changes to apply to a message when it is marked as read.

Tags starting with \"+\" (or not starting with either \"+\" or
\"-\") in the list will be added, and tags starting with \"-\"
will be removed from the message being marked as read.

For example, if you wanted to remove an \"unread\" tag and add a
\"read\" tag (which would make little sense), you would set:
    (\"-unread\" \"+read\")"
  :type '(repeat string)
  :group 'notmuch-show)

(defcustom notmuch-show-mark-read-function #'notmuch-show-seen-current-message
  "Function to control which messages are marked read.

The function should take two arguments START and END which will
be the start and end of the visible portion of the buffer and
should mark the appropriate messages read by applying
`notmuch-show-mark-read'. This function will be called after
every user interaction with notmuch."
  :type 'function
  :group 'notmuch-show)

(defcustom notmuch-show-imenu-indent nil
  "Should Imenu display messages indented.

By default, Imenu (see Info node `(emacs) Imenu') in a
notmuch-show buffer displays all messages straight.  This is
because the default Emacs frontend for Imenu makes it difficult
to select an Imenu entry with spaces in front.  Other imenu
frontends such as counsel-imenu does not have this limitation.
In these cases, Imenu entries can be indented to reflect the
position of the message in the thread."
  :type 'boolean
  :group 'notmuch-show)

;;; Utilities

(defmacro with-current-notmuch-show-message (&rest body)
  "Evaluate body with current buffer set to the text of current message."
  `(save-excursion
     (let ((id (notmuch-show-get-message-id)))
       (let ((buf (generate-new-buffer (concat "*notmuch-msg-" id "*"))))
	 (with-current-buffer buf
	   (let ((coding-system-for-read 'no-conversion))
	     (notmuch--call-process notmuch-command nil t nil "show" "--format=raw" id))
	   ,@body)
	 (kill-buffer buf)))))

(defun notmuch-show-turn-on-visual-line-mode ()
  "Enable Visual Line mode."
  (visual-line-mode t))

;;; Commands

;; DEPRECATED in Notmuch 0.16 since we now have convenient part
;; commands.  We'll keep the command around for a version or two in
;; case people want to bind it themselves.
(defun notmuch-show-view-all-mime-parts ()
  "Use external viewers to view all attachments from the current message."
  (interactive)
  (with-current-notmuch-show-message
   ;; We override the mm-inline-media-tests to indicate which message
   ;; parts are already sufficiently handled by the original
   ;; presentation of the message in notmuch-show mode. These parts
   ;; will be inserted directly into the temporary buffer of
   ;; with-current-notmuch-show-message and silently discarded.
   ;;
   ;; Any MIME part not explicitly mentioned here will be handled by an
   ;; external viewer as configured in the various mailcap files.
   (let ((mm-inline-media-tests
	  '(("text/.*" ignore identity)
	    ("application/pgp-signature" ignore identity)
	    ("multipart/alternative" ignore identity)
	    ("multipart/mixed" ignore identity)
	    ("multipart/related" ignore identity))))
     (mm-display-parts (mm-dissect-buffer)))))

(defun notmuch-show-save-attachments ()
  "Save all attachments from the current message."
  (interactive)
  (with-current-notmuch-show-message
   (let ((mm-handle (mm-dissect-buffer)))
     (notmuch-save-attachments
      mm-handle (> (notmuch-count-attachments mm-handle) 1))))
  (message "Done"))

(defun notmuch-show-with-message-as-text (fn)
  "Apply FN to a text representation of the current message.

FN is called with one argument, the message properties. It should
operation on the contents of the current buffer."
  ;; Remake the header to ensure that all information is available.
  (let* ((to (notmuch-show-get-to))
	 (cc (notmuch-show-get-cc))
	 (from (notmuch-show-get-from))
	 (subject (notmuch-show-get-subject))
	 (date (notmuch-show-get-date))
	 (tags (notmuch-show-get-tags))
	 (depth (notmuch-show-get-depth))
	 (header (concat
		  "Subject: " subject "\n"
		  "To: " to "\n"
		  (if (not (string-empty-p cc))
		      (concat "Cc: " cc "\n")
		    "")
		  "From: " from "\n"
		  "Date: " date "\n"
		  (if tags
		      (concat "Tags: "
			      (mapconcat #'identity tags ", ") "\n")
		    "")))
	 (all (buffer-substring (notmuch-show-message-top)
				(notmuch-show-message-bottom)))

	 (props (notmuch-show-get-message-properties))
	 (indenting notmuch-show-indent-content))
    (with-temp-buffer
      (insert all)
      (when indenting
	(indent-rigidly (point-min)
			(point-max)
			(- (* notmuch-show-indent-messages-width depth))))
      ;; Remove the original header.
      (goto-char (point-min))
      (re-search-forward "^$" (point-max) nil)
      (delete-region (point-min) (point))
      (insert header)
      (funcall fn props))))

(defun notmuch-show-print-message ()
  "Print the current message."
  (interactive)
  (notmuch-show-with-message-as-text 'notmuch-print-message))

;;; Headers

(defun notmuch-show-fontify-header ()
  (let ((face (cond
	       ((looking-at "[Tt]o:")
		'message-header-to)
	       ((looking-at "[Bb]?[Cc][Cc]:")
		'message-header-cc)
	       ((looking-at "[Ss]ubject:")
		'message-header-subject)
	       (t
		'message-header-other))))
    (overlay-put (make-overlay (point) (re-search-forward ":"))
		 'face 'message-header-name)
    (overlay-put (make-overlay (point) (re-search-forward ".*$"))
		 'face face)))

(defun notmuch-show-colour-headers ()
  "Apply some colouring to the current headers."
  (goto-char (point-min))
  (while (looking-at "^[A-Za-z][-A-Za-z0-9]*:")
    (notmuch-show-fontify-header)
    (forward-line)))

(defun notmuch-show-spaces-n (n)
  "Return a string comprised of `n' spaces."
  (make-string n ? ))

(defun notmuch-show-update-tags (tags)
  "Update the displayed tags of the current message."
  (save-excursion
    (let ((inhibit-read-only t)
	  (start (notmuch-show-message-top))
	  (depth (notmuch-show-get-prop :depth))
	  (orig-tags (notmuch-show-get-prop :orig-tags))
	  (props (notmuch-show-get-message-properties))
	  (extent (notmuch-show-message-extent)))
      (goto-char start)
      (notmuch-show-insert-headerline props depth tags orig-tags)
      (put-text-property start (1+ start)
			 :notmuch-message-properties props)
      (put-text-property (car extent) (cdr extent) :notmuch-message-extent extent)
      ;; delete original headerline, but do not save to kill ring
      (delete-region (point) (1+ (line-end-position))))))

(defun notmuch-clean-address (address)
  "Try to clean a single email ADDRESS for display. Return a cons
cell of (AUTHOR_EMAIL AUTHOR_NAME). Return (ADDRESS nil) if
parsing fails."
  (condition-case nil
      (let (p-name p-address)
	;; It would be convenient to use `mail-header-parse-address',
	;; but that expects un-decoded mailbox parts, whereas our
	;; mailbox parts are already decoded (and hence may contain
	;; UTF-8). Given that notmuch should handle most of the awkward
	;; cases, some simple string deconstruction should be sufficient
	;; here.
	(cond
	 ;; "User <user@dom.ain>" style.
	 ((string-match "\\(.*\\) <\\(.*\\)>" address)
	  (setq p-name (match-string 1 address))
	  (setq p-address (match-string 2 address)))

	 ;; "<user@dom.ain>" style.
	 ((string-match "<\\(.*\\)>" address)
	  (setq p-address (match-string 1 address)))
	 ;; Everything else.
	 (t
	  (setq p-address address)))
	(when p-name
	  ;; Remove elements of the mailbox part that are not relevant for
	  ;; display, even if they are required during transport:
	  ;;
	  ;; Backslashes.
	  (setq p-name (replace-regexp-in-string "\\\\" "" p-name))
	  ;; Outer single and double quotes, which might be nested.
	  (cl-loop with start-of-loop
		   do   (setq start-of-loop p-name)
		   when (string-match "^\"\\(.*\\)\"$" p-name)
		   do   (setq p-name (match-string 1 p-name))
		   when (string-match "^'\\(.*\\)'$" p-name)
		   do   (setq p-name (match-string 1 p-name))
		   until (string= start-of-loop p-name)))
	;; If the address is 'foo@bar.com <foo@bar.com>' then show just
	;; 'foo@bar.com'.
	(when (string= p-name p-address)
	  (setq p-name nil))
	(cons p-address p-name))
    (error (cons address nil))))

(defun notmuch-show-clean-address (address)
  "Try to clean a single email ADDRESS for display.
Return unchanged ADDRESS if parsing fails."
  (let* ((clean-address (notmuch-clean-address address))
	 (p-address (car clean-address))
	 (p-name (cdr clean-address)))
    ;; If no name, return just the address.
    (if (not p-name)
	p-address
      ;; Otherwise format the name and address together.
      (concat p-name " <" p-address ">"))))

(defun notmuch-show--mark-height (tree)
  "Calculate and cache height (distance from deepest descendent)"
  (let* ((msg (car tree))
	 (children (cadr tree))
	 (cached-height (plist-get msg :height)))
    (or cached-height
	(let ((height
	       (if (null children) 0
		 (1+ (apply #'max (mapcar #'notmuch-show--mark-height children))))))
	  (plist-put msg :height height)
	  height))))

(defun notmuch-show-insert-headerline (msg-plist depth tags &optional orig-tags)
  "Insert a notmuch style headerline based on HEADERS for a
message at DEPTH in the current thread."
  (let* ((start (point))
	 (headers (plist-get msg-plist :headers))
	 (duplicate (or (plist-get msg-plist :duplicate) 0))
	 (file-count (length (plist-get msg-plist :filename)))
	 (date (or (and notmuch-show-relative-dates
			(plist-get msg-plist :date_relative))
		   (plist-get headers :Date)))
	 (from (notmuch-sanitize
	       (notmuch-show-clean-address (plist-get headers :From)))))
    (when (string-match "\\cR" from)
      ;; If the From header has a right-to-left character add
      ;; invisible U+200E LEFT-TO-RIGHT MARK character which forces
      ;; the header paragraph as left-to-right text.
      (insert (propertize (string ?\x200e) 'invisible t)))
    (insert (if notmuch-show-indent-content
		(notmuch-show-spaces-n (* notmuch-show-indent-messages-width
					  depth))
	      "")
	    from
	    " ("
	    date
	    ") ("
	    (notmuch-tag-format-tags tags (or orig-tags tags))
	    ")")
    (insert
     (if (> file-count 1)
	 (let ((txt (format "%d/%d\n" duplicate file-count)))
	   (concat
	    (notmuch-show-spaces-n (max 0 (- (window-width) (+ (current-column) (length txt)))))
	    txt))
       "\n"))
    (overlay-put (make-overlay start (point))
		 'face 'notmuch-message-summary-face)))

(defun notmuch-show-insert-header (header header-value)
  "Insert a single header."
  (insert header ": " (notmuch-sanitize header-value) "\n"))

(defun notmuch-show-insert-headers (headers)
  "Insert the headers of the current message."
  (let ((start (point)))
    (mapc (lambda (header)
	    (let* ((header-symbol (intern (concat ":" header)))
		   (header-value (plist-get headers header-symbol)))
	      (when (and header-value
			 (not (string-equal "" header-value)))
		(notmuch-show-insert-header header header-value))))
	  notmuch-message-headers)
    (save-excursion
      (save-restriction
	(narrow-to-region start (point-max))
	(run-hooks 'notmuch-show-markup-headers-hook)))))

;;; Parts

(define-button-type 'notmuch-show-part-button-type
  'action 'notmuch-show-part-button-default
  'follow-link t
  'face 'message-mml
  :supertype 'notmuch-button-type)

(defun notmuch-show-insert-part-header (_nth content-type declared-type
					    &optional name comment)
  (let ((base-label (concat (and name (concat name ": "))
			    declared-type
			    (and (not (string-equal declared-type content-type))
				 (concat " (as " content-type ")"))
			    comment)))
    (prog1 (insert-button
	    (concat "[ " base-label " ]")
	    :base-label base-label
	    :type 'notmuch-show-part-button-type
	    :notmuch-part-hidden nil)
      (insert "\n"))))

(defun notmuch-show-toggle-part-invisibility (&optional button)
  (interactive)
  (let ((button (or button (button-at (point)))))
    (when button
      (let ((overlay (button-get button 'overlay))
	    (lazy-part (button-get button :notmuch-lazy-part)))
	;; We have a part to toggle if there is an overlay or if there
	;; is a lazy part.  If neither is present we cannot toggle the
	;; part so we just return nil.
	(when (or overlay lazy-part)
	  (let* ((show (button-get button :notmuch-part-hidden))
		 (new-start (button-start button))
		 (button-label (button-get button :base-label))
		 (old-point (point))
		 (properties (text-properties-at (button-start button)))
		 (inhibit-read-only t))
	    ;; Toggle the button itself.
	    (button-put button :notmuch-part-hidden (not show))
	    (goto-char new-start)
	    (insert "[ " button-label (if show " ]" " (hidden) ]"))
	    (set-text-properties new-start (point) properties)
	    (let ((old-end (button-end button)))
	      (move-overlay button new-start (point))
	      (delete-region (point) old-end))
	    (goto-char (min old-point (1- (button-end button))))
	    ;; Return nil if there is a lazy-part, it is empty, and we are
	    ;; trying to show it.  In all other cases return t.
	    (if lazy-part
		(when show
		  (button-put button :notmuch-lazy-part nil)
		  (notmuch-show-lazy-part lazy-part button))
	      ;; else there must be an overlay.
	      (overlay-put overlay 'invisible (not show))
	      t)))))))

;;; Part content ID handling

(defvar notmuch-show--cids nil
  "Alist from raw content ID to (MSG PART).")
(make-variable-buffer-local 'notmuch-show--cids)

(defun notmuch-show--register-cids (msg part)
  "Register content-IDs in PART and all of PART's sub-parts."
  (let ((content-id (plist-get part :content-id)))
    (when content-id
      ;; Note that content-IDs are globally unique, except when they
      ;; aren't: RFC 2046 section 5.1.4 permits children of a
      ;; multipart/alternative to have the same content-ID, in which
      ;; case the MUA is supposed to pick the best one it can render.
      ;; We simply add the content-ID to the beginning of our alist;
      ;; so if this happens, we'll take the last (and "best")
      ;; alternative (even if we can't render it).
      (push (list content-id msg part) notmuch-show--cids)))
  ;; Recurse on sub-parts
  (when-let ((type (plist-get part :content-type)))
    (pcase-let ((`(,type ,subtype)
		 (split-string (downcase type) "/")))
      (cond ((equal type "multipart")
	     (mapc (apply-partially #'notmuch-show--register-cids msg)
		   (plist-get part :content)))
	    ((and (equal type "message")
		  (equal subtype "rfc822"))
	     (notmuch-show--register-cids
	      msg
	      (car (plist-get (car (plist-get part :content)) :body))))))))

(defun notmuch-show--get-cid-content (cid)
  "Return a list (CID-content content-type) or nil.

This will only find parts from messages that have been inserted
into the current buffer.  CID must be a raw content ID, without
enclosing angle brackets, a cid: prefix, or URL encoding.  This
will return nil if the CID is unknown or cannot be retrieved."
  (when-let ((descriptor (cdr (assoc cid notmuch-show--cids))))
    (pcase-let ((`(,msg ,part) descriptor))
      ;; Request caching for this content, as some messages
      ;; reference the same cid: part many times (hundreds!).
      (list (notmuch-get-bodypart-binary
	     msg part notmuch-show-process-crypto 'cache)
	    (plist-get part :content-type)))))

(defun notmuch-show-setup-w3m ()
  "Instruct w3m how to retrieve content from a \"related\" part of a message."
  (interactive)
  (when (and (boundp 'w3m-cid-retrieve-function-alist)
	     (not (assq 'notmuch-show-mode w3m-cid-retrieve-function-alist)))
    (push (cons 'notmuch-show-mode #'notmuch-show--cid-w3m-retrieve)
	  w3m-cid-retrieve-function-alist))
  (setq mm-html-inhibit-images nil))

(defvar w3m-current-buffer) ;; From `w3m.el'.
(defun notmuch-show--cid-w3m-retrieve (url &rest _args)
  ;; url includes the cid: prefix and is URL encoded (see RFC 2392).
  (let* ((cid (url-unhex-string (substring url 4)))
	 (content-and-type
	  (with-current-buffer w3m-current-buffer
	    (notmuch-show--get-cid-content cid))))
    (when content-and-type
      (insert (car content-and-type))
      (cadr content-and-type))))

;; MIME part renderers

(defun notmuch-show-multipart/*-to-list (part)
  (mapcar (lambda (inner-part) (plist-get inner-part :content-type))
	  (plist-get part :content)))

(defun notmuch-show-insert-part-multipart/alternative (msg part _content-type _nth depth _button)
  (let ((chosen-type (car (notmuch-multipart/alternative-choose
			   msg (notmuch-show-multipart/*-to-list part))))
	(inner-parts (plist-get part :content))
	(start (point)))
    ;; This inserts all parts of the chosen type rather than just one,
    ;; but it's not clear that this is the wrong thing to do - which
    ;; should be chosen if there are more than one that match?
    (mapc (lambda (inner-part)
	    (let* ((inner-type (plist-get inner-part :content-type))
		   (hide (not (or notmuch-show-all-multipart/alternative-parts
				  (string= chosen-type inner-type)))))
	      (notmuch-show-insert-bodypart msg inner-part depth hide)))
	  inner-parts)

    (when notmuch-show-indent-multipart
      (indent-rigidly start (point) 1)))
  t)

(defun notmuch-show-insert-part-multipart/related (msg part _content-type _nth depth _button)
  (let ((inner-parts (plist-get part :content))
	(start (point)))
    ;; Render the primary part.  FIXME: Support RFC 2387 Start header.
    (notmuch-show-insert-bodypart msg (car inner-parts) depth)
    ;; Add hidden buttons for the rest
    (mapc (lambda (inner-part)
	    (notmuch-show-insert-bodypart msg inner-part depth t))
	  (cdr inner-parts))
    (when notmuch-show-indent-multipart
      (indent-rigidly start (point) 1)))
  t)

(defun notmuch-show-insert-part-multipart/signed (msg part _content-type _nth depth button)
  (when button
    (button-put button 'face 'notmuch-crypto-part-header))
  ;; Insert a button detailing the signature status.
  (notmuch-crypto-insert-sigstatus-button (car (plist-get part :sigstatus))
					  (notmuch-show-get-header :From msg))
  (let ((inner-parts (plist-get part :content))
	(start (point)))
    ;; Show all of the parts.
    (mapc (lambda (inner-part)
	    (notmuch-show-insert-bodypart msg inner-part depth))
	  inner-parts)
    (when notmuch-show-indent-multipart
      (indent-rigidly start (point) 1)))
  t)

(defun notmuch-show-insert-part-multipart/encrypted (msg part _content-type _nth depth button)
  (when button
    (button-put button 'face 'notmuch-crypto-part-header))
  ;; Insert a button detailing the encryption status.
  (notmuch-crypto-insert-encstatus-button (car (plist-get part :encstatus)))
  ;; Insert a button detailing the signature status.
  (notmuch-crypto-insert-sigstatus-button (car (plist-get part :sigstatus))
					  (notmuch-show-get-header :From msg))
  (let ((inner-parts (plist-get part :content))
	(start (point)))
    ;; Show all of the parts.
    (mapc (lambda (inner-part)
	    (notmuch-show-insert-bodypart msg inner-part depth))
	  inner-parts)
    (when notmuch-show-indent-multipart
      (indent-rigidly start (point) 1)))
  t)

(defun notmuch-show-insert-part-application/pgp-encrypted (_msg _part _content-type _nth _depth _button)
  t)

(defun notmuch-show-insert-part-multipart/* (msg part _content-type _nth depth _button)
  (let ((inner-parts (plist-get part :content))
	(start (point)))
    ;; Show all of the parts.
    (mapc (lambda (inner-part)
	    (notmuch-show-insert-bodypart msg inner-part depth))
	  inner-parts)
    (when notmuch-show-indent-multipart
      (indent-rigidly start (point) 1)))
  t)

(defun notmuch-show-insert-part-message/rfc822 (msg part _content-type _nth depth _button)
  (let ((message (car (plist-get part :content))))
    (and
     message
     (let ((body (car (plist-get message :body)))
	   (start (point)))
       ;; Override `notmuch-message-headers' to force `From' to be
       ;; displayed.
       (let ((notmuch-message-headers '("From" "Subject" "To" "Cc" "Date")))
	 (notmuch-show-insert-headers (plist-get message :headers)))
       ;; Blank line after headers to be compatible with the normal
       ;; message display.
       (insert "\n")
       ;; Show the body
       (notmuch-show-insert-bodypart msg body depth)
       (when notmuch-show-indent-multipart
	 (indent-rigidly start (point) 1))
       t))))

(defun notmuch-show-insert-part-text/plain (msg part _content-type _nth depth button)
  ;; For backward compatibility we want to apply the text/plain hook
  ;; to the whole of the part including the part button if there is
  ;; one.
  (let ((start (if button
		   (button-start button)
		 (point))))
    (insert (notmuch-get-bodypart-text msg part notmuch-show-process-crypto))
    (save-excursion
      (save-restriction
	(narrow-to-region start (point-max))
	(run-hook-with-args 'notmuch-show-insert-text/plain-hook msg depth))))
  t)

(defun notmuch-show-insert-part-text/calendar (msg part _content-type _nth _depth _button)
  (insert (with-temp-buffer
	    (insert (notmuch-get-bodypart-text msg part notmuch-show-process-crypto))
	    ;; notmuch-get-bodypart-text does no newline conversion.
	    ;; Replace CRLF with LF before icalendar can use it.
	    (goto-char (point-min))
	    (while (re-search-forward "\r\n" nil t)
	      (replace-match "\n" nil nil))
	    (let ((file (make-temp-file "notmuch-ical"))
		  result)
	      (unwind-protect
		  (progn
		    (unless (icalendar-import-buffer file t)
		      (error "Icalendar import error. %s"
			     "See *icalendar-errors* for more information"))
		    (set-buffer (get-file-buffer file))
		    (setq result (buffer-substring (point-min) (point-max)))
		    (set-buffer-modified-p nil)
		    (kill-buffer (current-buffer)))
		(delete-file file))
	      result)))
  t)

;; For backwards compatibility.
(defun notmuch-show-insert-part-text/x-vcalendar (msg part _content-type _nth depth _button)
  (notmuch-show-insert-part-text/calendar msg part nil nil depth nil))

(when (version< emacs-version "25.3")
  ;; https://bugs.gnu.org/28350
  ;;
  ;; For newer emacs, we fall back to notmuch-show-insert-part-*/*
  ;; (see notmuch-show-handlers-for)
  (defun notmuch-show-insert-part-text/enriched
      (msg part content-type nth depth button)
    ;; By requiring enriched below, we ensure that the function
    ;; enriched-decode-display-prop is defined before it will be
    ;; shadowed by the letf below. Otherwise the version in
    ;; enriched.el may be loaded a bit later and used instead (for
    ;; the first time).
    (require 'enriched)
    (cl-letf (((symbol-function 'enriched-decode-display-prop)
	       (lambda (start end &optional _param) (list start end))))
      (notmuch-show-insert-part-*/* msg part content-type nth depth button))))

(defun notmuch-show-get-mime-type-of-application/octet-stream (part)
  ;; If we can deduce a MIME type from the filename of the attachment,
  ;; we return that.
  (and (plist-get part :filename)
       (let ((extension (file-name-extension (plist-get part :filename))))
	 (and extension
	      (progn
		(mailcap-parse-mimetypes)
		(let ((mime-type (mailcap-extension-to-mime extension)))
		  (and mime-type
		       (not (string-equal mime-type "application/octet-stream"))
		       mime-type)))))))

(defun notmuch-show-insert-part-text/html (msg part content-type nth depth button)
  (if (eq mm-text-html-renderer 'shr)
      ;; It's easier to drive shr ourselves than to work around the
      ;; goofy things `mm-shr' does (like irreversibly taking over
      ;; content ID handling).
      ;; FIXME: If we block an image, offer a button to load external
      ;; images.
      (let ((shr-blocked-images notmuch-show-text/html-blocked-images))
	(notmuch-show--insert-part-text/html-shr msg part))
    ;; Otherwise, let message-mode do the heavy lifting
    ;;
    ;; w3m sets up a keymap which "leaks" outside the invisible region
    ;; and causes strange effects in notmuch. We set
    ;; mm-inline-text-html-with-w3m-keymap to nil to tell w3m not to
    ;; set a keymap (so the normal notmuch-show-mode-map remains).
    (let ((mm-inline-text-html-with-w3m-keymap nil)
	  ;; FIXME: If we block an image, offer a button to load external
	  ;; images.
	  (gnus-blocked-images notmuch-show-text/html-blocked-images)
	  (w3m-ignored-image-url-regexp notmuch-show-text/html-blocked-images))
      (notmuch-show-insert-part-*/* msg part content-type nth depth button))))

;;; Functions used by notmuch-show--insert-part-text/html-shr

(declare-function libxml-parse-html-region "xml.c")
(declare-function shr-insert-document "shr")

(defun notmuch-show--insert-part-text/html-shr (msg part)
  ;; Make sure shr is loaded before we start let-binding its globals
  (require 'shr)
  (let ((dom (let ((process-crypto notmuch-show-process-crypto))
	       (with-temp-buffer
		 (insert (notmuch-get-bodypart-text msg part process-crypto))
		 (libxml-parse-html-region (point-min) (point-max)))))
	(shr-content-function
	 (lambda (url)
	   ;; shr strips the "cid:" part of URL, but doesn't
	   ;; URL-decode it (see RFC 2392).
	   (let ((cid (url-unhex-string url)))
	     (car (notmuch-show--get-cid-content cid))))))
    (shr-insert-document dom)
    t))

(defun notmuch-show-insert-part-*/* (msg part content-type _nth _depth _button)
  ;; This handler _must_ succeed - it is the handler of last resort.
  (notmuch-mm-display-part-inline msg part content-type notmuch-show-process-crypto)
  t)

;;; Functions for determining how to handle MIME parts.

(defun notmuch-show-handlers-for (content-type)
  "Return a list of content handlers for a part of type CONTENT-TYPE."
  (let (result)
    (mapc (lambda (func)
	    (when (functionp func)
	      (push func result)))
	  ;; Reverse order of prefrence.
	  (list (intern (concat "notmuch-show-insert-part-*/*"))
		(intern (concat "notmuch-show-insert-part-"
				(car (split-string content-type "/"))
				"/*"))
		(intern (concat "notmuch-show-insert-part-" content-type))))
    result))

;;; Parts

(defun notmuch-show-insert-bodypart-internal (msg part content-type nth depth button)
  ;; Run the handlers until one of them succeeds.
  (cl-loop for handler in (notmuch-show-handlers-for content-type)
	   until (condition-case err
		     (funcall handler msg part content-type nth depth button)
		   ;; Specifying `debug' here lets the debugger run if
		   ;; `debug-on-error' is non-nil.
		   ((debug error)
		    (insert "!!! Bodypart handler `" (prin1-to-string handler)
			    "' threw an error:\n"
			    "!!! " (error-message-string err) "\n")
		    nil))))

(defun notmuch-show-create-part-overlays (button beg end)
  "Add an overlay to the part between BEG and END."
  ;; If there is no button (i.e., the part is text/plain and the first
  ;; part) or if the part has no content then we don't make the part
  ;; toggleable.
  (when (and button (/= beg end))
    (button-put button 'overlay (make-overlay beg end))
    ;; Return true if we created an overlay.
    t))

(defun notmuch-show-record-part-information (part beg end)
  "Store PART as a text property from BEG to END."
  ;; Record part information.  Since we already inserted subparts,
  ;; don't override existing :notmuch-part properties.
  (notmuch-map-text-property beg end :notmuch-part
			     (lambda (v) (or v part)))
  ;; Make :notmuch-part front sticky and rear non-sticky so it stays
  ;; applied to the beginning of each line when we indent the
  ;; message.  Since we're operating on arbitrary renderer output,
  ;; watch out for sticky specs of t, which means all properties are
  ;; front-sticky/rear-nonsticky.
  (notmuch-map-text-property beg end 'front-sticky
			     (lambda (v)
			       (if (listp v)
				   (cl-pushnew :notmuch-part v)
				 v)))
  (notmuch-map-text-property beg end 'rear-nonsticky
			     (lambda (v)
			       (if (listp v)
				   (cl-pushnew :notmuch-part v)
				 v))))

(defun notmuch-show-lazy-part (part-args button)
  ;; Insert the lazy part after the button for the part. We would just
  ;; move to the start of the new line following the button and insert
  ;; the part but that point might have text properties (eg colours
  ;; from a message header etc) so instead we start from the last
  ;; character of the button by adding a newline and finish by
  ;; removing the extra newline from the end of the part.
  (save-excursion
    (goto-char (button-end button))
    (insert "\n")
    (let* ((inhibit-read-only t)
	   ;; We need to use markers for the start and end of the part
	   ;; because the part insertion functions do not guarantee
	   ;; to leave point at the end of the part.
	   (part-beg (copy-marker (point) nil))
	   (part-end (copy-marker (point) t))
	   ;; We have to save the depth as we can't find the depth
	   ;; when narrowed.
	   (depth (notmuch-show-get-depth))
	   (mime-type (plist-get (cadr part-args) :computed-type)))
      (save-restriction
	(narrow-to-region part-beg part-end)
	(delete-region part-beg part-end)
	(when (and mime-type (string-match "^image/" mime-type))
	  (button-put button :notmuch-redisplay-data part-args))
	(apply #'notmuch-show-insert-bodypart-internal part-args)
	(indent-rigidly part-beg
			part-end
			(* notmuch-show-indent-messages-width depth)))
      (goto-char part-end)
      (delete-char 1)
      (notmuch-show-record-part-information (cadr part-args)
					    (button-start button)
					    part-end)
      ;; Create the overlay. If the lazy-part turned out to be empty/not
      ;; showable this returns nil.
      (notmuch-show-create-part-overlays button part-beg part-end))))

(defun notmuch-show-mime-type (part)
  "Return the correct mime-type to use for PART."
  (when-let ((content-type (plist-get part :content-type)))
    (setq content-type (downcase content-type))
    (or (and (string= content-type "application/octet-stream")
	     (notmuch-show-get-mime-type-of-application/octet-stream part))
	(and (string= content-type "inline patch")
	     "text/x-diff")
	content-type)))

;; The following variable can be overridden by let bindings.
(defvar notmuch-show-insert-header-p-function 'notmuch-show-insert-header-p
  "Specify which function decides which part headers get inserted.

The function should take two parameters, PART and HIDE, and
should return non-NIL if a header button should be inserted for
this part.")

(defun notmuch-show-insert-header-p (part _hide)
  ;; Show all part buttons except for the first part if it is text/plain.
  (let ((mime-type (notmuch-show-mime-type part)))
    (not (and (string= mime-type "text/plain")
	      (<= (plist-get part :id) 1)))))

(defun notmuch-show-reply-insert-header-p-never (_part _hide)
  nil)

(defun notmuch-show-reply-insert-header-p-trimmed (part hide)
  (let ((mime-type (notmuch-show-mime-type part)))
    (and (not (notmuch-match-content-type mime-type "multipart/*"))
	 (not hide))))

(defun notmuch-show-reply-insert-header-p-minimal (part hide)
  (let ((mime-type (notmuch-show-mime-type part)))
    (and (notmuch-match-content-type mime-type "text/*")
	 (not hide))))

(defun notmuch-show-insert-bodypart (msg part depth &optional hide)
  "Insert the body part PART at depth DEPTH in the current thread.

HIDE determines whether to show or hide the part and the button
as follows: If HIDE is nil, show the part and the button. If HIDE
is t, hide the part initially and show the button."
  (let* ((content-type (plist-get part :content-type))
	 (mime-type (notmuch-show-mime-type part))
	 (nth (plist-get part :id))
	 (height (plist-get msg :height))
	 (long (and (notmuch-match-content-type mime-type "text/*")
		    (> notmuch-show-max-text-part-size 0)
		    (> (length (plist-get part :content))
		       notmuch-show-max-text-part-size)))
	 (deep (and notmuch-show-depth-limit
		    (> depth notmuch-show-depth-limit)))
	 (high (and notmuch-show-height-limit
		    (> height notmuch-show-height-limit)))
	 (beg (point))
	 ;; This default header-p function omits the part button for
	 ;; the first (or only) part if this is text/plain.
	 (button (and (or deep long high
			  (funcall notmuch-show-insert-header-p-function part hide))
		      (notmuch-show-insert-part-header
		       nth mime-type
		       (and content-type (downcase content-type))
		       (plist-get part :filename))))
	 ;; Hide the part initially if HIDE is t, or if it is too long/deep
	 ;; and we have a button to allow toggling.
	 (show-part (not (or (equal hide t)
			     (and deep button)
			     (and high button)
			     (and long button))))
	 (content-beg (point))
	 (part-data (list msg part mime-type nth depth button)))
    ;; Store the computed mime-type for later use (e.g. by attachment handlers).
    (plist-put part :computed-type mime-type)
    (cond
     (show-part
      (apply #'notmuch-show-insert-bodypart-internal part-data)
      (when (and button (string-match "^image/" mime-type))
	(button-put button :notmuch-redisplay-data part-data)))
     (t
      (when button
	(button-put button :notmuch-lazy-part part-data))))
    ;; Some of the body part handlers leave point somewhere up in the
    ;; part, so we make sure that we're down at the end.
    (goto-char (point-max))
    ;; Ensure that the part ends with a carriage return.
    (unless (bolp)
      (insert "\n"))
    ;; We do not create the overlay for hidden (lazy) parts until
    ;; they are inserted.
    (if show-part
	(notmuch-show-create-part-overlays button content-beg (point))
      (save-excursion
	(notmuch-show-toggle-part-invisibility button)))
    (notmuch-show-record-part-information part beg (point))))

(defun notmuch-show-insert-body (msg body depth)
  "Insert the body BODY at depth DEPTH in the current thread."
  ;; Register all content IDs for this message.  According to RFC
  ;; 2392, content IDs are *global*, but it's okay if an MUA treats
  ;; them as only global within a message.
  (notmuch-show--register-cids msg (car body))
  (mapc (lambda (part) (notmuch-show-insert-bodypart msg part depth)) body))

(defun notmuch-show-make-symbol (type)
  (make-symbol (concat "notmuch-show-" type)))

(defun notmuch-show-strip-re (string)
  (replace-regexp-in-string "^\\([Rr]e: *\\)+" "" string))

(defvar notmuch-show-previous-subject "")
(make-variable-buffer-local 'notmuch-show-previous-subject)

(defun notmuch-show-choose-duplicate (duplicate)
  "Display message file with index DUPLICATE in place of the current one.

Message file indices are based on the order the files are
discovered by `notmuch new' (and hence are somewhat arbitrary),
and correspond to those passed to the \"\\-\\-duplicate\" arguments
to the CLI.

When called interactively, the function will prompt for the index
of the file to display.  An error will be signaled if the index
is out of range."
  (interactive "Nduplicate: ")
  (let ((count (length (notmuch-show-get-prop :filename))))
    (when (or (> duplicate count)
	      (< duplicate 1))
      (error "Duplicate %d out of range [1,%d]" duplicate count)))
  (notmuch-show-move-to-message-top)
  (save-excursion
    (let* ((extent (notmuch-show-message-extent))
	   (id (notmuch-show-get-message-id))
	   (depth (notmuch-show-get-depth))
	   (inhibit-read-only t)
	   (new-msg (notmuch--run-show (list id) duplicate)))
      ;; clean up existing overlays to avoid extending them.
      (dolist (o (overlays-in (car extent) (cdr extent)))
	(delete-overlay o))
      ;; pretend insertion is happening at end of buffer
      (narrow-to-region (point-min) (car extent))
      ;; Insert first, then delete, to avoid marker for start of next
      ;; message being in same place as the start of this one.
      (notmuch-show-insert-msg new-msg depth)
      (widen)
      (delete-region (point) (cdr extent)))))

(defun notmuch-show-insert-msg (msg depth)
  "Insert the message MSG at depth DEPTH in the current thread."
  (let* ((headers (plist-get msg :headers))
	 ;; Indentation causes the buffer offset of the start/end
	 ;; points to move, so we must use markers.
	 message-start message-end
	 content-start content-end
	 headers-start headers-end
	 (bare-subject (notmuch-show-strip-re (plist-get headers :Subject))))
    (setq message-start (point-marker))
    (notmuch-show-insert-headerline msg depth (plist-get msg :tags))
    (setq content-start (point-marker))
    ;; Set `headers-start' to point after the 'Subject:' header to be
    ;; compatible with the existing implementation. This just sets it
    ;; to after the first header.
    (notmuch-show-insert-headers headers)
    (save-excursion
      (goto-char content-start)
      ;; If the subject of this message is the same as that of the
      ;; previous message, don't display it when this message is
      ;; collapsed.
      (unless (string= notmuch-show-previous-subject bare-subject)
	(forward-line 1))
      (setq headers-start (point-marker)))
    (setq headers-end (point-marker))
    (setq notmuch-show-previous-subject bare-subject)
    ;; A blank line between the headers and the body.
    (insert "\n")
    (notmuch-show-insert-body msg (plist-get msg :body)
			      (if notmuch-show-indent-content depth 0))
    ;; Ensure that the body ends with a newline.
    (unless (bolp)
      (insert "\n"))
    (setq content-end (point-marker))
    ;; Indent according to the depth in the thread.
    (when notmuch-show-indent-content
      (indent-rigidly content-start
		      content-end
		      (* notmuch-show-indent-messages-width depth)))
    (setq message-end (point-max-marker))
    ;; Save the extents of this message over the whole text of the
    ;; message.
    (put-text-property message-start message-end
		       :notmuch-message-extent
		       (cons message-start message-end))
    ;; Create overlays used to control visibility
    (plist-put msg :headers-overlay (make-overlay headers-start headers-end))
    (plist-put msg :message-overlay (make-overlay headers-start content-end))
    (plist-put msg :depth depth)
    ;; Save the properties for this message. Currently this saves the
    ;; entire message (augmented it with other stuff), which seems
    ;; like overkill. We might save a reduced subset (for example, not
    ;; the content).
    (notmuch-show-set-message-properties msg)
    ;; Set header visibility.
    (notmuch-show-headers-visible msg notmuch-message-headers-visible)
    ;; Message visibility depends on whether it matched the search
    ;; criteria.
    (notmuch-show-message-visible msg (and (plist-get msg :match)
					   (not (plist-get msg :excluded))))))

;;; Toggle commands

(defun notmuch-show-toggle-process-crypto ()
  "Toggle the processing of cryptographic MIME parts."
  (interactive)
  (setq notmuch-show-process-crypto (not notmuch-show-process-crypto))
  (message (if notmuch-show-process-crypto
	       "Processing cryptographic MIME parts."
	     "Not processing cryptographic MIME parts."))
  (notmuch-show-refresh-view))

(defun notmuch-show-toggle-elide-non-matching ()
  "Toggle the display of non-matching messages."
  (interactive)
  (setq notmuch-show-elide-non-matching-messages
	(not notmuch-show-elide-non-matching-messages))
  (message (if notmuch-show-elide-non-matching-messages
	       "Showing matching messages only."
	     "Showing all messages."))
  (notmuch-show-refresh-view))

(defun notmuch-show-toggle-thread-indentation ()
  "Toggle the indentation of threads."
  (interactive)
  (setq notmuch-show-indent-content (not notmuch-show-indent-content))
  (message (if notmuch-show-indent-content
	       "Content is indented."
	     "Content is not indented."))
  (notmuch-show-refresh-view))

;;; Main insert functions

(defun notmuch-show-insert-tree (tree depth)
  "Insert the message tree TREE at depth DEPTH in the current thread."
  (let ((msg (car tree))
	(replies (cadr tree)))
    ;; We test whether there is a message or just some replies.
    (when msg
      (notmuch-show--mark-height tree)
      (notmuch-show-insert-msg msg depth))
    (notmuch-show-insert-thread replies (1+ depth))))

(defun notmuch-show-insert-thread (thread depth)
  "Insert the thread THREAD at depth DEPTH in the current forest."
  (mapc (lambda (tree) (notmuch-show-insert-tree tree depth)) thread))

(defun notmuch-show-insert-forest (forest)
  "Insert the forest of threads FOREST."
  (mapc (lambda (thread) (notmuch-show-insert-thread thread 0)) forest))

;;; Link buttons

(defvar notmuch-id-regexp
  (concat
   ;; Match the id: prefix only if it begins a word (to disallow, for
   ;; example, matching cid:).
   "\\<id:\\("
   ;; If the term starts with a ", then parse Xapian's quoted boolean
   ;; term syntax, which allows for anything as long as embedded
   ;; double quotes escaped by doubling them.  We also disallow
   ;; newlines (which Xapian allows) to prevent runaway terms.
   "\"\\([^\"\n]\\|\"\"\\)*\""
   ;; Otherwise, parse Xapian's unquoted syntax, which goes up to the
   ;; next space or ).  We disallow [.,;] as the last character
   ;; because these are probably part of the surrounding text, and not
   ;; part of the id.  This doesn't match single character ids; meh.
   "\\|[^\"[:space:])][^[:space:])]*[^])[:space:].,:;?!]"
   "\\)")
  "The regexp used to match id: links in messages.")

(defvar notmuch-mid-regexp
  ;; goto-address-url-regexp matched cid: links, which have the same
  ;; grammar as the message ID part of a mid: link.  Construct the
  ;; regexp using the same technique as goto-address-url-regexp.
  (concat "\\<mid:\\(" thing-at-point-url-path-regexp "\\)")
  "The regexp used to match mid: links in messages.

See RFC 2392.")

(defun notmuch-show-buttonise-links (start end)
  "Buttonise URLs and mail addresses between START and END.

This also turns id:\"<message id>\"-parts and mid: links into
buttons for a corresponding notmuch search."
  (goto-address-fontify-region start end)
  (save-excursion
    (let (links
	  (beg-line (progn (goto-char start) (line-beginning-position)))
	  (end-line (progn (goto-char end) (line-end-position))))
      (goto-char beg-line)
      (while (re-search-forward notmuch-id-regexp end-line t)
	(push (list (match-beginning 0) (match-end 0)
		    (match-string-no-properties 0)) links))
      (goto-char beg-line)
      (while (re-search-forward notmuch-mid-regexp end-line t)
	(let* ((mid-cid (match-string-no-properties 1))
	       (mid (save-match-data
		      (string-match "^[^/]*" mid-cid)
		      (url-unhex-string (match-string 0 mid-cid)))))
	  (push (list (match-beginning 0) (match-end 0)
		      (notmuch-id-to-query mid)) links)))
      (pcase-dolist (`(,beg ,end ,link) links)
	;; Remove the overlay created by goto-address-mode
	(remove-overlays beg end 'goto-address t)
	(make-text-button beg end
			  :type 'notmuch-button-type
			  'action `(lambda (arg)
				     (notmuch-show ,link current-prefix-arg))
			  'follow-link t
			  'help-echo "Mouse-1, RET: search for this message"
			  'face goto-address-mail-face)))))

;;; Show command

;;;###autoload
(defun notmuch-show (thread-id &optional elide-toggle parent-buffer query-context buffer-name)
  "Run \"notmuch show\" with the given thread ID and display results.

ELIDE-TOGGLE, if non-nil, inverts the default elide behavior.

The optional PARENT-BUFFER is the notmuch-search buffer from
which this notmuch-show command was executed, (so that the
next thread from that buffer can be show when done with this
one).

The optional QUERY-CONTEXT is a notmuch search term. Only
messages from the thread matching this search term are shown if
non-nil.

The optional BUFFER-NAME provides the name of the buffer in
which the message thread is shown. If it is nil (which occurs
when the command is called interactively) the argument to the
function is used.

Returns the buffer containing the messages, or NIL if no messages
matched."
  (interactive "sNotmuch show: \nP")
  (let ((buffer-name (generate-new-buffer-name
		      (or buffer-name
			  (concat "*notmuch-" thread-id "*"))))
	(mm-inline-override-types (notmuch--inline-override-types)))

    (pop-to-buffer-same-window (get-buffer-create buffer-name))
    ;; No need to track undo information for this buffer.
    (setq buffer-undo-list t)
    (notmuch-show-mode)
    ;; Set various buffer local variables to their appropriate initial
    ;; state. Do this after enabling `notmuch-show-mode' so that they
    ;; aren't wiped out.
    (setq notmuch-show-thread-id thread-id)
    (setq notmuch-show-parent-buffer parent-buffer)
    (setq notmuch-show-query-context
	  (if (or (string= query-context "")
		  (string= query-context "*"))
	      nil
	    query-context))
    (setq notmuch-show-process-crypto notmuch-crypto-process-mime)
    ;; If `elide-toggle', invert the default value.
    (setq notmuch-show-elide-non-matching-messages
	  (if elide-toggle
	      (not notmuch-show-only-matching-messages)
	    notmuch-show-only-matching-messages))
    (add-hook 'post-command-hook #'notmuch-show-command-hook nil t)
    (jit-lock-register #'notmuch-show-buttonise-links)
    (notmuch-tag-clear-cache)
    (let ((inhibit-read-only t))
      (if (notmuch-show--build-buffer)
	  ;; Messages were inserted into the buffer.
	  (current-buffer)
	;; No messages were inserted - presumably none matched the
	;; query.
	(kill-buffer (current-buffer))
	(ding)
	(message "No messages matched the query!")
	nil))))

(defun notmuch-show--build-queries (thread context)
  "Return a list of queries to try for this search.

THREAD and CONTEXT are both strings, though CONTEXT may be nil.
When CONTEXT is not nil, the first query is the conjunction of it
and THREAD.  The next query is THREAD alone, and serves as a
fallback if the prior matches no messages."
  (let (queries)
    (push (list thread) queries)
    (when context
      (push (list thread "and (" context ")") queries))
    queries))

(defun notmuch-show--header-line-format ()
  "Compute the header line format of a notmuch-show buffer."
  (when notmuch-show-header-line
    (let* ((s (notmuch-sanitize
	       (notmuch-show-strip-re (notmuch-show-get-subject))))
	   (subject (replace-regexp-in-string "%" "%%" s)))
      (cond ((stringp notmuch-show-header-line)
             (format-spec notmuch-show-header-line `((?s . ,subject))))
	    ((functionp notmuch-show-header-line)
	     (funcall notmuch-show-header-line subject))
	    (notmuch-show-header-line subject)))))

(defun notmuch-show--build-buffer (&optional state)
  "Display messages matching the current buffer context.

Apply the previously saved STATE if supplied, otherwise show the
first relevant message.

If no messages match the query return NIL."
  (let* ((cli-args (list "--exclude=false"))
	 (cli-args (if notmuch-show-elide-non-matching-messages (cons "--entire-thread=false" cli-args) cli-args))
	 ;; "part 0 is the whole message (headers and body)" notmuch-show(1)
	 (cli-args (if notmuch-show-single-message (cons "--part=0" cli-args) cli-args))
	 (queries (notmuch-show--build-queries
		   notmuch-show-thread-id notmuch-show-query-context))
	 (forest nil)
	 ;; Must be reset every time we are going to start inserting
	 ;; messages into the buffer.
	 (notmuch-show-previous-subject ""))
    ;; Use results from the first query that returns some.
    (while (and (not forest) queries)
      (setq forest (notmuch--run-show
		    (append cli-args (list "'") (car queries) (list "'"))))
      (when (and forest notmuch-show-single-message)
	(setq forest (list (list (list forest)))))
      (setq queries (cdr queries)))
    (when forest
      (notmuch-show-insert-forest forest)
      ;; Store the original tags for each message so that we can
      ;; display changes.
      (notmuch-show-mapc
       (lambda () (notmuch-show-set-prop :orig-tags (notmuch-show-get-tags))))
      (setq header-line-format (notmuch-show--header-line-format))
      (run-hooks 'notmuch-show-hook)
      (if state
	  (notmuch-show-apply-state state)
	;; With no state to apply, just go to the first message.
	(notmuch-show-goto-first-wanted-message)))
    ;; Report back to the caller whether any messages matched.
    forest))

;;; Refresh command

(defun notmuch-show-capture-state ()
  "Capture the state of the current buffer.

This includes:
 - the list of open messages,
 - the combination of current message id with/for each visible window."
  (let* ((win-list (get-buffer-window-list (current-buffer) nil t))
	 (win-id-combo (mapcar (lambda (win)
				 (with-selected-window win
				   (list win (notmuch-show-get-message-id))))
			       win-list)))
    (list win-id-combo (notmuch-show-get-message-ids-for-open-messages))))

(defun notmuch-show-get-query ()
  "Return the current query in this show buffer."
  (if notmuch-show-query-context
      (concat notmuch-show-thread-id
	      " and ("
	      notmuch-show-query-context
	      ")")
    notmuch-show-thread-id))

(defun notmuch-show-goto-message (msg-id)
  "Go to message with msg-id."
  (goto-char (point-min))
  (unless (cl-loop if (string= msg-id (notmuch-show-get-message-id))
		   return t
		   until (not (notmuch-show-goto-message-next)))
    (goto-char (point-min))
    (message "Message-id not found."))
  (notmuch-show-message-adjust))

(defun notmuch-show-apply-state (state)
  "Apply STATE to the current buffer.

This includes:
 - opening the messages previously opened,
 - closing all other messages,
 - moving to the correct current message in every displayed window."
  (let ((win-msg-alist (car state))
	(open (cadr state)))
    ;; Open those that were open.
    (goto-char (point-min))
    (cl-loop do (notmuch-show-message-visible
		 (notmuch-show-get-message-properties)
		 (member (notmuch-show-get-message-id) open))
	     until (not (notmuch-show-goto-message-next)))
    (dolist (win-msg-pair win-msg-alist)
      (with-selected-window (car win-msg-pair)
	;; Go to the previously open message in this window
	(notmuch-show-goto-message (cadr win-msg-pair))))))

(defun notmuch-show-refresh-view (&optional reset-state)
  "Refresh the current view.

Refreshes the current view, observing changes in display
preferences. If invoked with a prefix argument (or RESET-STATE is
non-nil) then the state of the buffer (open/closed messages) is
reset based on the original query."
  (interactive "P")
  (let ((inhibit-read-only t)
	(mm-inline-override-types (notmuch--inline-override-types))
	(state (unless reset-state
		 (notmuch-show-capture-state))))
    ;; `erase-buffer' does not seem to remove overlays, which can lead
    ;; to weird effects such as remaining images, so remove them
    ;; manually.
    (remove-overlays)
    (erase-buffer)
    (unless (notmuch-show--build-buffer state)
      ;; No messages were inserted.
      (kill-buffer (current-buffer))
      (ding)
      (message "Refreshing the buffer resulted in no messages!"))))

;;; Keymaps

(defvar notmuch-show-stash-map
  (let ((map (make-sparse-keymap)))
    (define-key map "c" 'notmuch-show-stash-cc)
    (define-key map "d" 'notmuch-show-stash-date)
    (define-key map "F" 'notmuch-show-stash-filename)
    (define-key map "f" 'notmuch-show-stash-from)
    (define-key map "i" 'notmuch-show-stash-message-id)
    (define-key map "I" 'notmuch-show-stash-message-id-stripped)
    (define-key map "s" 'notmuch-show-stash-subject)
    (define-key map "T" 'notmuch-show-stash-tags)
    (define-key map "t" 'notmuch-show-stash-to)
    (define-key map "l" 'notmuch-show-stash-mlarchive-link)
    (define-key map "L" 'notmuch-show-stash-mlarchive-link-and-go)
    (define-key map "G" 'notmuch-show-stash-git-send-email)
    (define-key map "?" 'notmuch-subkeymap-help)
    map)
  "Submap for stash commands.")
(fset 'notmuch-show-stash-map notmuch-show-stash-map)

(defvar notmuch-show-part-map
  (let ((map (make-sparse-keymap)))
    (define-key map "s" 'notmuch-show-save-part)
    (define-key map "v" 'notmuch-show-view-part)
    (define-key map "o" 'notmuch-show-interactively-view-part)
    (define-key map "|" 'notmuch-show-pipe-part)
    (define-key map "m" 'notmuch-show-choose-mime-of-part)
    (define-key map "?" 'notmuch-subkeymap-help)
    map)
  "Submap for part commands.")
(fset 'notmuch-show-part-map notmuch-show-part-map)

(defvar notmuch-show-mode-map
  (let ((map (make-sparse-keymap)))
    (set-keymap-parent map notmuch-common-keymap)
    (define-key map "Z" 'notmuch-tree-from-show-current-query)
    (define-key map "U" 'notmuch-unthreaded-from-show-current-query)
    (define-key map (kbd "<C-tab>") 'widget-backward)
    (define-key map (kbd "M-TAB") 'notmuch-show-previous-button)
    (define-key map (kbd "<backtab>") 'notmuch-show-previous-button)
    (define-key map (kbd "TAB") 'notmuch-show-next-button)
    (define-key map "f" 'notmuch-show-forward-message)
    (define-key map "F" 'notmuch-show-forward-open-messages)
    (define-key map "b" 'notmuch-show-resend-message)
    (define-key map "l" 'notmuch-show-filter-thread)
    (define-key map "r" 'notmuch-show-reply-sender)
    (define-key map "R" 'notmuch-show-reply)
    (define-key map "|" 'notmuch-show-pipe-message)
    (define-key map "w" 'notmuch-show-save-attachments)
    (define-key map "V" 'notmuch-show-view-raw-message)
    (define-key map "e" 'notmuch-show-resume-message)
    (define-key map "c" 'notmuch-show-stash-map)
    (define-key map "h" 'notmuch-show-toggle-visibility-headers)
    (define-key map "k" 'notmuch-tag-jump)
    (define-key map "*" 'notmuch-show-tag-all)
    (define-key map "-" 'notmuch-show-remove-tag)
    (define-key map "+" 'notmuch-show-add-tag)
    (define-key map "X" 'notmuch-show-archive-thread-then-exit)
    (define-key map "x" 'notmuch-show-archive-message-then-next-or-exit)
    (define-key map "A" 'notmuch-show-archive-thread-then-next)
    (define-key map "a" 'notmuch-show-archive-message-then-next-or-next-thread)
    (define-key map "N" 'notmuch-show-next-message)
    (define-key map "P" 'notmuch-show-previous-message)
    (define-key map "n" 'notmuch-show-next-open-message)
    (define-key map "p" 'notmuch-show-previous-open-message)
    (define-key map (kbd "M-n") 'notmuch-show-next-thread-show)
    (define-key map (kbd "M-p") 'notmuch-show-previous-thread-show)
    (define-key map (kbd "DEL") 'notmuch-show-rewind)
    (define-key map " " 'notmuch-show-advance-and-archive)
    (define-key map (kbd "M-RET") 'notmuch-show-open-or-close-all)
    (define-key map (kbd "RET") 'notmuch-show-toggle-message)
    (define-key map "#" 'notmuch-show-print-message)
    (define-key map "!" 'notmuch-show-toggle-elide-non-matching)
    (define-key map "$" 'notmuch-show-toggle-process-crypto)
    (define-key map "%" 'notmuch-show-choose-duplicate)
    (define-key map "<" 'notmuch-show-toggle-thread-indentation)
    (define-key map "t" 'toggle-truncate-lines)
    (define-key map "." 'notmuch-show-part-map)
    (define-key map "B" 'notmuch-show-browse-urls)
    map)
  "Keymap for \"notmuch show\" buffers.")

;;; Mode

(define-derived-mode notmuch-show-mode fundamental-mode "notmuch-show"
  "Major mode for viewing a thread with notmuch.

This buffer contains the results of the \"notmuch show\" command
for displaying a single thread of email from your email archives.

By default, various components of email messages, (citations,
signatures, already-read messages), are hidden. You can make
these parts visible by clicking with the mouse button or by
pressing RET after positioning the cursor on a hidden part, (for
which \\[notmuch-show-next-button] and \\[notmuch-show-previous-button] are helpful).

Reading the thread sequentially is well-supported by pressing
\\[notmuch-show-advance-and-archive]. This will scroll the current message (if necessary), advance
to the next message, or advance to the next thread (if already on
the last message of a thread).

Other commands are available to read or manipulate the thread
more selectively, (such as '\\[notmuch-show-next-message]' and '\\[notmuch-show-previous-message]' to advance to messages
without removing any tags, and '\\[notmuch-show-archive-thread]' to archive an entire thread
without scrolling through with \\[notmuch-show-advance-and-archive]).

You can add or remove arbitrary tags from the current message with
'\\[notmuch-show-add-tag]' or '\\[notmuch-show-remove-tag]'.

All currently available key bindings:

\\{notmuch-show-mode-map}"
  (setq notmuch-buffer-refresh-function #'notmuch-show-refresh-view)
  (setq buffer-read-only t)
  (setq truncate-lines t)
  (setq imenu-prev-index-position-function
	#'notmuch-show-imenu-prev-index-position-function)
  (setq imenu-extract-index-name-function
	#'notmuch-show-imenu-extract-index-name-function))

;;; Tree commands

(defun notmuch-tree-from-show-current-query ()
  "Call notmuch tree with the current query."
  (interactive)
  (notmuch-tree notmuch-show-thread-id
		notmuch-show-query-context
		(notmuch-show-get-message-id)))

(defun notmuch-unthreaded-from-show-current-query ()
  "Call notmuch unthreaded with the current query."
  (interactive)
  (notmuch-unthreaded notmuch-show-thread-id
		      notmuch-show-query-context
		      (notmuch-show-get-message-id)))

;;; Movement related functions.

(defun notmuch-show-move-to-message-top ()
  (goto-char (notmuch-show-message-top)))

(defun notmuch-show-move-to-message-bottom ()
  (goto-char (notmuch-show-message-bottom)))

;; There's some strangeness here where a text property applied to a
;; region a->b is not found when point is at b. We walk backwards
;; until finding the property.
(defun notmuch-show-message-extent ()
  "Return a cons cell containing the start and end buffer offset
of the current message."
  (let (r)
    (save-excursion
      (while (not (setq r (get-text-property (point) :notmuch-message-extent)))
	(backward-char)))
    r))

(defun notmuch-show-message-top ()
  (car (notmuch-show-message-extent)))

(defun notmuch-show-message-bottom ()
  (cdr (notmuch-show-message-extent)))

(defun notmuch-show-goto-message-next ()
  (let ((start (point)))
    (notmuch-show-move-to-message-bottom)
    (if (not (eobp))
	t
      (goto-char start)
      nil)))

(defun notmuch-show-goto-message-previous ()
  (notmuch-show-move-to-message-top)
  (if (bobp)
      nil
    (backward-char)
    (notmuch-show-move-to-message-top)
    t))

(defun notmuch-show-mapc (function)
  "Iterate through all messages in the current thread with
`notmuch-show-goto-message-next' and call FUNCTION for side
effects."
  (save-excursion
    (goto-char (point-min))
    (cl-loop do (funcall function)
	     while (notmuch-show-goto-message-next))))

;;; Functions relating to the visibility of messages and their components.

(defun notmuch-show-message-visible (props visible-p)
  (overlay-put (plist-get props :message-overlay) 'invisible (not visible-p))
  (notmuch-show-set-prop :message-visible visible-p props))

(defun notmuch-show-headers-visible (props visible-p)
  (overlay-put (plist-get props :headers-overlay) 'invisible (not visible-p))
  (notmuch-show-set-prop :headers-visible visible-p props))

;;; Functions for setting and getting attributes of the current message.

(defun notmuch-show-set-message-properties (props)
  (save-excursion
    (notmuch-show-move-to-message-top)
    (put-text-property (point) (+ (point) 1)
		       :notmuch-message-properties props)))

(defun notmuch-show-get-message-properties ()
  "Return the properties of the current message as a plist.

Some useful entries are:
:headers - Property list containing the headers :Date, :Subject, :From, etc.
:body - Body of the message
:tags - Tags for this message"
  (save-excursion
    (notmuch-show-move-to-message-top)
    (get-text-property (point) :notmuch-message-properties)))

(defun notmuch-show-get-part-properties ()
  "Return the properties of the innermost part containing point.

This is the part property list retrieved from the CLI.  Signals
an error if there is no part containing point."
  (or (get-text-property (point) :notmuch-part)
      (error "No message part here")))

(defun notmuch-show-set-prop (prop val &optional props)
  (let ((inhibit-read-only t)
	(props (or props
		   (notmuch-show-get-message-properties))))
    (plist-put props prop val)
    (notmuch-show-set-message-properties props)))

(defun notmuch-show-get-prop (prop &optional props)
  "Get property PROP from current message in show or tree mode.

It gets property PROP from PROPS or, if PROPS is nil, the current
message in either tree or show. This means that several utility
functions in notmuch-show can be used directly by notmuch-tree as
they just need the correct message properties."
  (plist-get (or props
		 (cond ((eq major-mode 'notmuch-show-mode)
			(notmuch-show-get-message-properties))
		       ((eq major-mode 'notmuch-tree-mode)
			(notmuch-tree-get-message-properties))
		       (t nil)))
	     prop))

(defun notmuch-show-get-message-id (&optional bare)
  "Return an id: query for the Message-Id of the current message.

If optional argument BARE is non-nil, return
the Message-Id without id: prefix and escaping."
  (if bare
      (notmuch-show-get-prop :id)
    (notmuch-id-to-query (notmuch-show-get-prop :id))))

(defun notmuch-show-get-messages-ids ()
  "Return all id: queries of messages in the current thread."
  (let ((message-ids))
    (notmuch-show-mapc
     (lambda () (push (notmuch-show-get-message-id) message-ids)))
    message-ids))

(defun notmuch-show-get-messages-ids-search ()
  "Return a search string for all message ids of messages in the
current thread."
  (mapconcat 'identity (notmuch-show-get-messages-ids) " or "))

;; dme: Would it make sense to use a macro for many of these?

(defun notmuch-show-get-filename ()
  "Return the filename of the current message."
  (let ((duplicate (notmuch-show-get-duplicate)))
    (nth (1- duplicate) (notmuch-show-get-prop :filename))))

(defun notmuch-show-get-header (header &optional props)
  "Return the named header of the current message, if any."
  (plist-get (notmuch-show-get-prop :headers props) header))

(defun notmuch-show-get-cc ()
  (notmuch-show-get-header :Cc))

(defun notmuch-show-get-date ()
  (notmuch-show-get-header :Date))

(defun notmuch-show-get-duplicate ()
  ;; if no duplicate property exists, assume first file
  (or (notmuch-show-get-prop :duplicate) 1))

(defun notmuch-show-get-timestamp ()
  (notmuch-show-get-prop :timestamp))

(defun notmuch-show-get-from ()
  (notmuch-show-get-header :From))

(defun notmuch-show-get-subject ()
  (notmuch-show-get-header :Subject))

(defun notmuch-show-get-to ()
  (notmuch-show-get-header :To))

(defun notmuch-show-get-depth ()
  (notmuch-show-get-prop :depth))

(defun notmuch-show-set-tags (tags)
  "Set the tags of the current message."
  (notmuch-show-set-prop :tags tags)
  (notmuch-show-update-tags tags))

(defun notmuch-show-get-tags ()
  "Return the tags of the current message."
  (notmuch-show-get-prop :tags))

(defun notmuch-show-message-visible-p ()
  "Is the current message visible?"
  (notmuch-show-get-prop :message-visible))

(defun notmuch-show-headers-visible-p ()
  "Are the headers of the current message visible?"
  (notmuch-show-get-prop :headers-visible))

(put 'notmuch-show-mark-read 'notmuch-prefix-doc
     "Mark the current message as unread.")
(defun notmuch-show-mark-read (&optional unread)
  "Mark the current message as read.

Mark the current message as read by applying the tag changes in
`notmuch-show-mark-read-tags' to it (remove the \"unread\" tag by
default). If a prefix argument is given, the message will be
marked as unread, i.e. the tag changes in
`notmuch-show-mark-read-tags' will be reversed."
  (interactive "P")
  (when notmuch-show-mark-read-tags
    (apply 'notmuch-show-tag-message
	   (notmuch-tag-change-list notmuch-show-mark-read-tags unread))))

(defun notmuch-show-seen-current-message (_start _end)
  "Mark the current message read if it is open.

We only mark it read once: if it is changed back then that is a
user decision and we should not override it."
  (when (and (notmuch-show-message-visible-p)
	     (not (notmuch-show-get-prop :seen)))
    (notmuch-show-mark-read)
    (notmuch-show-set-prop :seen t)))

(defvar notmuch-show--seen-has-errored nil)
(make-variable-buffer-local 'notmuch-show--seen-has-errored)

(defun notmuch-show-command-hook ()
  (when (eq major-mode 'notmuch-show-mode)
    ;; We need to redisplay to get window-start and window-end correct.
    (redisplay)
    (save-excursion
      (condition-case nil
	  (funcall notmuch-show-mark-read-function (window-start) (window-end))
	((debug error)
	 (unless notmuch-show--seen-has-errored
	   (setq notmuch-show--seen-has-errored t)
	   (setq header-line-format
		 (concat header-line-format
			 (propertize
			  "  [some mark read tag changes may have failed]"
			  'face font-lock-warning-face)))))))))

(defun notmuch-show-filter-thread (query)
  "Filter or LIMIT the current thread based on a new query string.

Reshows the current thread with matches defined by the new query-string."
  (interactive (list (notmuch-read-query "Filter thread: ")))
  (let ((msg-id (notmuch-show-get-message-id)))
    (setq notmuch-show-query-context (if (string-empty-p query) nil query))
    (notmuch-show-refresh-view t)
    (notmuch-show-goto-message msg-id)))

;;; Functions for getting attributes of several messages in the current thread.

(defun notmuch-show-get-message-ids-for-open-messages ()
  "Return a list of all id: queries for open messages in the current thread."
  (save-excursion
    (let (message-ids done)
      (goto-char (point-min))
      (while (not done)
	(when (notmuch-show-message-visible-p)
	  (setq message-ids
		(append message-ids (list (notmuch-show-get-message-id)))))
	(setq done (not (notmuch-show-goto-message-next))))
      message-ids)))

;;; Commands typically bound to keys.

(defun notmuch-show-advance ()
  "Advance through thread.

If the current message in the thread is not yet fully visible,
scroll by a near screenful to read more of the message.

Otherwise, (the end of the current message is already within the
current window), advance to the next open message."
  (interactive)
  (let* ((end-of-this-message (notmuch-show-message-bottom))
	 (visible-end-of-this-message (1- end-of-this-message))
	 (ret nil))
    (while (invisible-p visible-end-of-this-message)
      (setq visible-end-of-this-message
	    (max (point-min)
		 (1- (previous-single-char-property-change
		      visible-end-of-this-message 'invisible)))))
    (cond
     ;; Ideally we would test `end-of-this-message' against the result
     ;; of `window-end', but that doesn't account for the fact that
     ;; the end of the message might be hidden.
     ((and visible-end-of-this-message
	   (> visible-end-of-this-message (window-end)))
      ;; The bottom of this message is not visible - scroll.
      (scroll-up nil))
     ((not (= end-of-this-message (point-max)))
      ;; This is not the last message - move to the next visible one.
      (notmuch-show-next-open-message))
     ((not (= (point) (point-max)))
      ;; This is the last message, but the cursor is not at the end of
      ;; the buffer. Move it there.
      (goto-char (point-max)))
     (t
      ;; This is the last message - change the return value
      (setq ret t)))
    ret))

(defun notmuch-show-advance-and-archive ()
  "Advance through thread and archive.

This command is intended to be one of the simplest ways to
process a thread of email. It works exactly like
notmuch-show-advance, in that it scrolls through messages in a
show buffer, except that when it gets to the end of the buffer it
archives the entire current thread, (apply changes in
`notmuch-archive-tags'), kills the buffer, and displays the next
thread from the search from which this thread was originally
shown."
  (interactive)
  (when (notmuch-show-advance)
    (notmuch-show-archive-thread-then-next)))

(defun notmuch-show-rewind ()
  "Backup through the thread (reverse scrolling compared to \
\\[notmuch-show-advance-and-archive]).

Specifically, if the beginning of the previous email is fewer
than `window-height' lines from the current point, move to it
just like `notmuch-show-previous-message'.

Otherwise, just scroll down a screenful of the current message.

This command does not modify any message tags, (it does not undo
any effects from previous calls to
`notmuch-show-advance-and-archive'."
  (interactive)
  (let ((start-of-message (notmuch-show-message-top))
	(start-of-window (window-start)))
    (cond
     ;; Either this message is properly aligned with the start of the
     ;; window or the start of this message is not visible on the
     ;; screen - scroll.
     ((or (= start-of-message start-of-window)
	  (< start-of-message start-of-window))
      (scroll-down)
      ;; If a small number of lines from the previous message are
      ;; visible, realign so that the top of the current message is at
      ;; the top of the screen.
      (when (<= (count-screen-lines (window-start) start-of-message)
		next-screen-context-lines)
	(goto-char (notmuch-show-message-top))
	(notmuch-show-message-adjust))
      ;; Move to the top left of the window.
      (goto-char (window-start)))
     (t
      ;; Move to the previous message.
      (notmuch-show-previous-message)))))

(put 'notmuch-show-reply 'notmuch-prefix-doc "... and prompt for sender")
(defun notmuch-show-reply (&optional prompt-for-sender)
  "Reply to the sender and all recipients of the current message."
  (interactive "P")
  (notmuch-mua-new-reply (notmuch-show-get-message-id) prompt-for-sender t
			 (notmuch-show-get-prop :duplicate)))

(put 'notmuch-show-reply-sender 'notmuch-prefix-doc "... and prompt for sender")
(defun notmuch-show-reply-sender (&optional prompt-for-sender)
  "Reply to the sender of the current message."
  (interactive "P")
  (notmuch-mua-new-reply (notmuch-show-get-message-id) prompt-for-sender nil
			 (notmuch-show-get-prop :duplicate)))

(put 'notmuch-show-forward-message 'notmuch-prefix-doc
     "... and prompt for sender")
(defun notmuch-show-forward-message (&optional prompt-for-sender)
  "Forward the current message."
  (interactive "P")
  (notmuch-mua-new-forward-messages (list (notmuch-show-get-message-id))
				    prompt-for-sender))

(put 'notmuch-show-forward-open-messages 'notmuch-prefix-doc
     "... and prompt for sender")
(defun notmuch-show-forward-open-messages (&optional prompt-for-sender)
  "Forward the currently open messages."
  (interactive "P")
  (let ((open-messages (notmuch-show-get-message-ids-for-open-messages)))
    (unless open-messages
      (error "No open messages to forward."))
    (notmuch-mua-new-forward-messages open-messages prompt-for-sender)))

(defun notmuch-show-resend-message (addresses)
  "Resend the current message."
  (interactive (list (notmuch-address-from-minibuffer "Resend to: ")))
  (when (y-or-n-p (concat "Confirm resend to " addresses " "))
    (notmuch-show-view-raw-message)
    (message-resend addresses)
    (notmuch-bury-or-kill-this-buffer)))

(defun notmuch-show-message-adjust ()
  (recenter 0))

(defun notmuch-show-next-message (&optional pop-at-end)
  "Show the next message.

If a prefix argument is given and this is the last message in the
thread, navigate to the next thread in the parent search buffer."
  (interactive "P")
  (if (notmuch-show-goto-message-next)
      (notmuch-show-message-adjust)
    (if pop-at-end
	(notmuch-show-next-thread)
      (goto-char (point-max)))))

(defun notmuch-show-previous-message ()
  "Show the previous message or the start of the current message."
  (interactive)
  (if (= (point) (notmuch-show-message-top))
      (notmuch-show-goto-message-previous)
    (notmuch-show-move-to-message-top))
  (notmuch-show-message-adjust))

(defun notmuch-show-next-open-message (&optional pop-at-end)
  "Show the next open message.

If a prefix argument is given and this is the last open message
in the thread, navigate to the next thread in the parent search
buffer. Return t if there was a next open message in the thread
to show, nil otherwise."
  (interactive "P")
  (let (r)
    (while (and (setq r (notmuch-show-goto-message-next))
		(not (notmuch-show-message-visible-p))))
    (if r
	(notmuch-show-message-adjust)
      (if pop-at-end
	  (notmuch-show-next-thread)
	(goto-char (point-max))))
    r))

(defun notmuch-show-next-matching-message ()
  "Show the next matching message."
  (interactive)
  (let (r)
    (while (and (setq r (notmuch-show-goto-message-next))
		(not (notmuch-show-get-prop :match))))
    (if r
	(notmuch-show-message-adjust)
      (goto-char (point-max)))))

(defun notmuch-show-open-if-matched ()
  "Open a message if it is matched (whether or not excluded)."
  (let ((props (notmuch-show-get-message-properties)))
    (notmuch-show-message-visible props (plist-get props :match))))

(defun notmuch-show-goto-first-wanted-message ()
  "Move to the first open message and mark it read."
  (goto-char (point-min))
  (unless (notmuch-show-message-visible-p)
    (notmuch-show-next-open-message))
  (when (eobp)
    ;; There are no matched non-excluded messages so open all matched
    ;; (necessarily excluded) messages and go to the first.
    (notmuch-show-mapc 'notmuch-show-open-if-matched)
    (force-window-update)
    (goto-char (point-min))
    (unless (notmuch-show-message-visible-p)
      (notmuch-show-next-open-message))))

(defun notmuch-show-previous-open-message ()
  "Show the previous open message."
  (interactive)
  (while (and (if (= (point) (notmuch-show-message-top))
		  (notmuch-show-goto-message-previous)
		(notmuch-show-move-to-message-top))
	      (not (notmuch-show-message-visible-p))))
  (notmuch-show-message-adjust))

(defun notmuch-show-view-raw-message ()
  "View the original source of the current message."
  (interactive)
  (let* ((id (notmuch-show-get-message-id))
	 (duplicate (notmuch-show-get-duplicate))
	 (args (if (> duplicate 1)
		   (list (format "--duplicate=%d" duplicate) id)
		 (list id)))
	 (buf (get-buffer-create (format "*notmuch-raw-%s-%d*" id duplicate)))
	 (inhibit-read-only t))
    (pop-to-buffer-same-window buf)
    (erase-buffer)
    (let ((coding-system-for-read 'no-conversion))
      (apply #'notmuch--call-process notmuch-command nil t nil "show" "--format=raw" args))
    (goto-char (point-min))
    (set-buffer-modified-p nil)
    (setq buffer-read-only t)
    (view-buffer buf 'kill-buffer-if-not-modified)))

(defun notmuch-show-resume-message ()
  "Resume EDITING the current draft message."
  (interactive)
  (notmuch-draft-resume (notmuch-show-get-message-id)))

(put 'notmuch-show-pipe-message 'notmuch-doc
     "Pipe the contents of the current message to a command.")
(put 'notmuch-show-pipe-message 'notmuch-prefix-doc
     "Pipe the thread as an mbox to a command.")
(defun notmuch-show-pipe-message (entire-thread command)
  "Pipe the contents of the current message (or thread) to COMMAND.

COMMAND will be executed with the raw contents of the current
email message as stdin. Anything printed by the command to stdout
or stderr will appear in the *notmuch-pipe* buffer.

If ENTIRE-THREAD is non-nil (or when invoked with a prefix
argument), COMMAND will receive all open messages in the current
thread (formatted as an mbox) rather than only the current
message."
  (interactive (let ((query-string (if current-prefix-arg
				       "Pipe all open messages to command: "
				     "Pipe message to command: ")))
		 (list current-prefix-arg (read-shell-command query-string))))
  (let (shell-command)
    (if entire-thread
	(setq shell-command
	      (concat notmuch-command " show --format=mbox --exclude=false "
		      (shell-quote-argument
		       (mapconcat 'identity
				  (notmuch-show-get-message-ids-for-open-messages)
				  " OR "))
		      " | " command))
      (setq shell-command
	    (concat notmuch-command " show --format=raw "
		    (shell-quote-argument (notmuch-show-get-message-id))
		    " | " command)))
    (let ((cwd default-directory)
	  (buf (get-buffer-create (concat "*notmuch-pipe*"))))
      (with-current-buffer buf
	(setq buffer-read-only t)
	(let ((inhibit-read-only t))
	  (erase-buffer)
	  ;; Use the originating buffer's working directory instead of
	  ;; that of the pipe buffer.
	  (cd cwd)
	  (let ((exit-code (call-process-shell-command shell-command nil buf)))
	    (goto-char (point-max))
	    (set-buffer-modified-p nil)
	    (unless (zerop exit-code)
	      (pop-to-buffer buf)
	      (message (format "Command '%s' exited abnormally with code %d"
			       shell-command exit-code)))))))))

(defun notmuch-show-tag-message (&rest tag-changes)
  "Change tags for the current message.

TAG-CHANGES is a list of tag operations for `notmuch-tag'."
  (let* ((current-tags (notmuch-show-get-tags))
	 (new-tags (notmuch-update-tags current-tags tag-changes)))
    (unless (equal current-tags new-tags)
      (notmuch-tag (notmuch-show-get-message-id) tag-changes)
      (notmuch-show-set-tags new-tags))))

(defun notmuch-show-tag (tag-changes)
  "Change tags for the current message.

See `notmuch-tag' for information on the format of TAG-CHANGES."
  (interactive (list (notmuch-read-tag-changes (notmuch-show-get-tags)
					       "Tag message")))
  (notmuch-tag (notmuch-show-get-message-id) tag-changes)
  (let* ((current-tags (notmuch-show-get-tags))
	 (new-tags (notmuch-update-tags current-tags tag-changes)))
    (unless (equal current-tags new-tags)
      (notmuch-show-set-tags new-tags))))

(defun notmuch-show-tag-all (tag-changes)
  "Change tags for all messages in the current show buffer.

See `notmuch-tag' for information on the format of TAG-CHANGES."
  (interactive
   (list (let (tags)
	   (notmuch-show-mapc
	    (lambda () (setq tags (append (notmuch-show-get-tags) tags))))
	   (notmuch-read-tag-changes tags "Tag thread"))))
  (notmuch-tag (notmuch-show-get-messages-ids-search) tag-changes)
  (notmuch-show-mapc
   (lambda ()
     (let* ((current-tags (notmuch-show-get-tags))
	    (new-tags (notmuch-update-tags current-tags tag-changes)))
       (unless (equal current-tags new-tags)
	 (notmuch-show-set-tags new-tags))))))

(defun notmuch-show-add-tag (tag-changes)
  "Change tags for the current message (defaulting to add).

Same as `notmuch-show-tag' but sets initial input to '+'."
  (interactive
   (list (notmuch-read-tag-changes (notmuch-show-get-tags) "Tag message" "+")))
  (notmuch-show-tag tag-changes))

(defun notmuch-show-remove-tag (tag-changes)
  "Change tags for the current message (defaulting to remove).

Same as `notmuch-show-tag' but sets initial input to '-'."
  (interactive
   (list (notmuch-read-tag-changes (notmuch-show-get-tags) "Tag message" "-")))
  (notmuch-show-tag tag-changes))

(defun notmuch-show-toggle-visibility-headers ()
  "Toggle the visibility of the current message headers."
  (interactive)
  (let ((props (notmuch-show-get-message-properties)))
    (notmuch-show-headers-visible
     props
     (not (plist-get props :headers-visible))))
  (force-window-update))

(defun notmuch-show-toggle-message ()
  "Toggle the visibility of the current message."
  (interactive)
  (let ((props (notmuch-show-get-message-properties)))
    (notmuch-show-message-visible
     props
     (not (plist-get props :message-visible))))
  (force-window-update))

(put 'notmuch-show-open-or-close-all 'notmuch-doc "Show all messages.")
(put 'notmuch-show-open-or-close-all 'notmuch-prefix-doc "Hide all messages.")
(defun notmuch-show-open-or-close-all ()
  "Set the visibility all of the messages in the current thread.

By default make all of the messages visible. With a prefix
argument, hide all of the messages."
  (interactive)
  (save-excursion
    (goto-char (point-min))
    (cl-loop do (notmuch-show-message-visible
		 (notmuch-show-get-message-properties)
		 (not current-prefix-arg))
	     until (not (notmuch-show-goto-message-next))))
  (force-window-update))

(defun notmuch-show-next-button ()
  "Advance point to the next button in the buffer."
  (interactive)
  (forward-button 1))

(defun notmuch-show-previous-button ()
  "Move point back to the previous button in the buffer."
  (interactive)
  (backward-button 1))

(defun notmuch-show-next-thread (&optional show previous)
  "Move to the next item in the search results, if any.

If SHOW is non-nil, open the next item in a show
buffer. Otherwise just highlight the next item in the search
buffer. If PREVIOUS is non-nil, move to the previous item in the
search results instead.

Return non-nil on success."
  (interactive "P")
  (let ((parent-buffer notmuch-show-parent-buffer))
    (notmuch-bury-or-kill-this-buffer)
    (when (buffer-live-p parent-buffer)
      (switch-to-buffer parent-buffer)
      (and (if previous
	       (notmuch-search-previous-thread)
	     (notmuch-search-next-thread))
	   show
	   (notmuch-search-show-thread)))))

(defun notmuch-show-next-thread-show ()
  "Show the next thread in the search results, if any."
  (interactive)
  (notmuch-show-next-thread t))

(defun notmuch-show-previous-thread-show ()
  "Show the previous thread in the search results, if any."
  (interactive)
  (notmuch-show-next-thread t t))

(put 'notmuch-show-archive-thread 'notmuch-prefix-doc
     "Un-archive each message in thread.")
(defun notmuch-show-archive-thread (&optional unarchive)
  "Archive each message in thread.

Archive each message currently shown by applying the tag changes
in `notmuch-archive-tags' to each. If a prefix argument is given,
the messages will be \"unarchived\", i.e. the tag changes in
`notmuch-archive-tags' will be reversed.

Note: This command is safe from any race condition of new messages
being delivered to the same thread. It does not archive the
entire thread, but only the messages shown in the current
buffer."
  (interactive "P")
  (when notmuch-archive-tags
    (notmuch-show-tag-all
     (notmuch-tag-change-list notmuch-archive-tags unarchive))))

(defun notmuch-show-archive-thread-then-next ()
  "Archive all messages in the current buffer, then show next thread from search."
  (interactive)
  (notmuch-show-archive-thread)
  (notmuch-show-next-thread t))

(defun notmuch-show-archive-thread-then-exit ()
  "Archive all messages in the current buffer, then exit back to search results."
  (interactive)
  (notmuch-show-archive-thread)
  (notmuch-show-next-thread))

(put 'notmuch-show-archive-message 'notmuch-prefix-doc
     "Un-archive the current message.")
(defun notmuch-show-archive-message (&optional unarchive)
  "Archive the current message.

Archive the current message by applying the tag changes in
`notmuch-archive-tags' to it. If a prefix argument is given, the
message will be \"unarchived\", i.e. the tag changes in
`notmuch-archive-tags' will be reversed."
  (interactive "P")
  (when notmuch-archive-tags
    (apply 'notmuch-show-tag-message
	   (notmuch-tag-change-list notmuch-archive-tags unarchive))))

(defun notmuch-show-archive-message-then-next-or-exit ()
  "Archive current message, then show next open message in current thread.

If at the last open message in the current thread, then exit back
to search results."
  (interactive)
  (notmuch-show-archive-message)
  (notmuch-show-next-open-message t))

(defun notmuch-show-archive-message-then-next-or-next-thread ()
  "Archive current message, then show next open message in current or next thread.

If at the last open message in the current thread, then show next
thread from search."
  (interactive)
  (notmuch-show-archive-message)
  (unless (notmuch-show-next-open-message)
    (notmuch-show-next-thread t)))

(defun notmuch-show-stash-cc ()
  "Copy CC field of current message to kill-ring."
  (interactive)
  (notmuch-common-do-stash (notmuch-show-get-cc)))

(put 'notmuch-show-stash-date 'notmuch-prefix-doc
     "Copy timestamp of current message to kill-ring.")
(defun notmuch-show-stash-date (&optional stash-timestamp)
  "Copy date of current message to kill-ring.

If invoked with a prefix argument, copy timestamp of current
message to kill-ring."
  (interactive "P")
  (if stash-timestamp
      (notmuch-common-do-stash (format "%d" (notmuch-show-get-timestamp)))
    (notmuch-common-do-stash (notmuch-show-get-date))))

(defun notmuch-show-stash-filename ()
  "Copy filename of current message to kill-ring."
  (interactive)
  (notmuch-common-do-stash (notmuch-show-get-filename)))

(defun notmuch-show-stash-from ()
  "Copy From address of current message to kill-ring."
  (interactive)
  (notmuch-common-do-stash (notmuch-show-get-from)))

(put 'notmuch-show-stash-message-id 'notmuch-prefix-doc
     "Copy thread: query matching current thread to kill-ring.")
(defun notmuch-show-stash-message-id (&optional stash-thread-id)
  "Copy id: query matching the current message to kill-ring.

If invoked with a prefix argument (or STASH-THREAD-ID is
non-nil), copy thread: query matching the current thread to
kill-ring."
  (interactive "P")
  (if stash-thread-id
      (notmuch-common-do-stash notmuch-show-thread-id)
    (notmuch-common-do-stash (notmuch-show-get-message-id))))

(defun notmuch-show-stash-message-id-stripped ()
  "Copy message ID of current message (sans `id:' prefix) to kill-ring."
  (interactive)
  (notmuch-common-do-stash (notmuch-show-get-message-id t)))

(defun notmuch-show-stash-subject ()
  "Copy Subject field of current message to kill-ring."
  (interactive)
  (notmuch-common-do-stash (notmuch-show-get-subject)))

(defun notmuch-show-stash-tags ()
  "Copy tags of current message to kill-ring as a comma separated list."
  (interactive)
  (notmuch-common-do-stash (mapconcat 'identity (notmuch-show-get-tags) ",")))

(defun notmuch-show-stash-to ()
  "Copy To address of current message to kill-ring."
  (interactive)
  (notmuch-common-do-stash (notmuch-show-get-to)))

(defun notmuch-show-stash-mlarchive-link (&optional mla)
  "Copy an ML Archive URI for the current message to the kill-ring.

This presumes that the message is available at the selected Mailing List Archive.

If optional argument MLA is non-nil, use the provided key instead of prompting
the user (see `notmuch-show-stash-mlarchive-link-alist')."
  (interactive)
  (let ((url (cdr (assoc
		   (or mla
		       (let ((completion-ignore-case t))
			 (completing-read
			  "Mailing List Archive: "
			  notmuch-show-stash-mlarchive-link-alist
			  nil t nil nil
			  notmuch-show-stash-mlarchive-link-default)))
		   notmuch-show-stash-mlarchive-link-alist))))
    (notmuch-common-do-stash
     (if (functionp url)
	 (funcall url (notmuch-show-get-message-id t))
       (concat url (notmuch-show-get-message-id t))))))

(defun notmuch-show-stash-mlarchive-link-and-go (&optional mla)
  "Copy an ML Archive URI for the current message to the kill-ring and visit it.

This presumes that the message is available at the selected Mailing List Archive.

If optional argument MLA is non-nil, use the provided key instead of prompting
the user (see `notmuch-show-stash-mlarchive-link-alist')."
  (interactive)
  (notmuch-show-stash-mlarchive-link mla)
  (browse-url (current-kill 0 t)))

(defun notmuch-show-stash-git-helper (addresses prefix)
  "Normalize all ADDRESSES while adding PREFIX.
Escape, trim, quote and add PREFIX to each address in list
of ADDRESSES, and return the result as a single string."
  (mapconcat (lambda (x)
	       (concat prefix "\""
		       ;; escape double-quotes
		       (replace-regexp-in-string
			"\"" "\\\\\""
			;; trim leading and trailing spaces
			(replace-regexp-in-string
			 "\\(^ *\\| *$\\)" ""
			 x)) "\""))
	     addresses " "))

(put 'notmuch-show-stash-git-send-email 'notmuch-prefix-doc
     "Copy From/To/Cc of current message to kill-ring.
Use a form suitable for pasting to git send-email command line.")

(defun notmuch-show-stash-git-send-email (&optional no-in-reply-to)
  "Copy From/To/Cc/Message-Id of current message to kill-ring.
Use a form suitable for pasting to git send-email command line.

If invoked with a prefix argument (or NO-IN-REPLY-TO is non-nil),
omit --in-reply-to=<Message-Id>."
  (interactive "P")
  (notmuch-common-do-stash
   (mapconcat 'identity
	      (remove ""
		      (list
		       (notmuch-show-stash-git-helper
			(message-tokenize-header (notmuch-show-get-from)) "--to=")
		       (notmuch-show-stash-git-helper
			(message-tokenize-header (notmuch-show-get-to)) "--to=")
		       (notmuch-show-stash-git-helper
			(message-tokenize-header (notmuch-show-get-cc)) "--cc=")
		       (unless no-in-reply-to
			 (notmuch-show-stash-git-helper
			  (list (notmuch-show-get-message-id t)) "--in-reply-to="))))
	      " ")))

;;; Interactive part functions and their helpers

(defun notmuch-show-generate-part-buffer (msg part)
  "Return a temporary buffer containing the specified part's content."
  (let ((buf (generate-new-buffer " *notmuch-part*"))
	(process-crypto notmuch-show-process-crypto))
    (with-current-buffer buf
      ;; This is always used in the content of mm handles, which
      ;; expect undecoded, binary part content.
      (insert (notmuch-get-bodypart-binary msg part process-crypto)))
    buf))

(defun notmuch-show-current-part-handle (&optional mime-type)
  "Return an mm-handle for the part containing point.

This creates a temporary buffer for the part's content; the
caller is responsible for killing this buffer as appropriate.  If
MIME-TYPE is given then set the handle's mime-type to MIME-TYPE."
  (let* ((msg (notmuch-show-get-message-properties))
	 (part (notmuch-show-get-part-properties))
	 (buf (notmuch-show-generate-part-buffer msg part))
	 (computed-type (or mime-type (plist-get part :computed-type)))
	 (filename (plist-get part :filename))
	 (disposition (and filename `(attachment (filename . ,filename)))))
    (mm-make-handle buf (list computed-type) nil nil disposition)))

(defun notmuch-show-apply-to-current-part-handle (fn &optional mime-type)
  "Apply FN to an mm-handle for the part containing point.

This ensures that the temporary buffer created for the mm-handle
is destroyed when FN returns. If MIME-TYPE is given then force
part to be treated as if it had that mime-type."
  (let ((handle (notmuch-show-current-part-handle mime-type)))
    ;; Emacs puts stdout/stderr into the calling buffer so we call
    ;; it from a temp-buffer, unless notmuch-show-attachment-debug
    ;; is non-nil, in which case we put it in " *notmuch-part*".
    (unwind-protect
	(if notmuch-show-attachment-debug
	    (with-current-buffer (generate-new-buffer " *notmuch-part*")
	      (funcall fn handle))
	  (with-temp-buffer
	    (funcall fn handle)))
      (kill-buffer (mm-handle-buffer handle)))))

(defun notmuch-show-part-button-default (&optional button)
  (interactive)
  (let ((button (or button (button-at (point)))))
    ;; Try to toggle the part, if that fails then call the default
    ;; action. The toggle fails if the part has no emacs renderable
    ;; content.
    (unless (notmuch-show-toggle-part-invisibility button)
      (call-interactively notmuch-show-part-button-default-action))))

(defun notmuch-show-save-part ()
  "Save the MIME part containing point to a file."
  (interactive)
  (notmuch-show-apply-to-current-part-handle #'mm-save-part))

(defun notmuch-show-view-part ()
  "View the MIME part containing point in an external viewer."
  (interactive)
  ;; Set mm-inlined-types to nil to force an external viewer
  (let ((mm-inlined-types nil))
    (notmuch-show-apply-to-current-part-handle #'mm-display-part)))

(defun notmuch-show-interactively-view-part ()
  "View the MIME part containing point, prompting for a viewer."
  (interactive)
  (notmuch-show-apply-to-current-part-handle #'mm-interactively-view-part))

(defun notmuch-show-pipe-part ()
  "Pipe the MIME part containing point to an external command."
  (interactive)
  (notmuch-show-apply-to-current-part-handle #'mm-pipe-part))

(defun notmuch-show--mm-display-part (handle)
  "Use mm-display-part to display HANDLE in a new buffer.

If the part is displayed in an external application then close
the new buffer."
  (let ((buf (get-buffer-create (generate-new-buffer-name
				 (concat " *notmuch-internal-part*")))))
    (pop-to-buffer-same-window buf)
    (if (eq (mm-display-part handle) 'external)
	(kill-buffer buf)
      (goto-char (point-min))
      (set-buffer-modified-p nil)
      (view-buffer buf 'kill-buffer-if-not-modified))))

(defun notmuch-show-choose-mime-of-part (mime-type)
  "Choose the mime type to use for displaying part."
  (interactive
   (list (completing-read "Mime type to use (default text/plain): "
			  (mailcap-mime-types) nil nil nil nil "text/plain")))
  (notmuch-show-apply-to-current-part-handle #'notmuch-show--mm-display-part
					     mime-type))

(defun notmuch-show-imenu-prev-index-position-function ()
  "Move point to previous message in notmuch-show buffer.
This function is used as a value for
`imenu-prev-index-position-function'."
  (if (bobp)
      nil
    (notmuch-show-previous-message)
    t))

(defun notmuch-show-imenu-extract-index-name-function ()
  "Return imenu name for line at point.
This function is used as a value for
`imenu-extract-index-name-function'.  Point should be at the
beginning of the line."
  (back-to-indentation)
  (buffer-substring-no-properties (if notmuch-show-imenu-indent
				      (line-beginning-position)
				    (point))
				  (line-end-position)))

(defmacro notmuch-show--with-currently-shown-message (&rest body)
  "Evaluate BODY with display restricted to the currently shown
message."
  `(save-excursion
     (save-restriction
       (let ((extent (notmuch-show-message-extent)))
	 (narrow-to-region (car extent) (cdr extent))
	 ,@body))))

(defun notmuch-show--gather-urls ()
  "Gather any URLs in the current message."
  (notmuch-show--with-currently-shown-message
   (let (urls)
     (goto-char (point-min))
     (while (re-search-forward goto-address-url-regexp (point-max) t)
       (push (match-string-no-properties 0) urls))
     (reverse urls))))

(defun notmuch-show-browse-urls (&optional kill)
  "Offer to browse any URLs in the current message.
With a prefix argument, copy the URL to the kill ring rather than
browsing."
  (interactive "P")
  (let ((urls (notmuch-show--gather-urls))
	(prompt (if kill "Copy URL to kill ring: " "Browse URL: "))
	(fn (if kill #'kill-new #'browse-url)))
    (if urls
	(funcall fn (completing-read prompt urls nil nil nil nil (car urls)))
      (message "No URLs found."))))

;;; _

(provide 'notmuch-show)

;;; notmuch-show.el ends here

debug log:

solving 54cf00c6 ...
found 54cf00c6 in https://yhetil.org/notmuch.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://yhetil.org/notmuch.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).