about summary refs log blame commit diff
path: root/third_party/emacs/rcirc/rcirc.el
blob: b59cb4e9afe45e681fae039eb09473575c76065e (plain) (tree)
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
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
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986















































                                                                                
                 


























































































































































































































































































































































































































                                                                                 

                                    























































































































































                                                                                   
                                              













































































































































































                                                                                 











                                                                 
                                                     








                                                                                 










                                                                      




                                                                  


























































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                              



                                                                                            















































































































































































































































































































































































































































































































                                                                                             











                                                                 






































































































































                                                                                     
;;; rcirc.el --- default, simple IRC client          -*- lexical-binding: t; -*-

;; Copyright (C) 2005-2019 Free Software Foundation, Inc.

;; Author: Ryan Yeske <rcyeske@gmail.com>
;; Maintainers: Ryan Yeske <rcyeske@gmail.com>,
;;		Leo Liu <sdl.web@gmail.com>
;; Keywords: comm

;; This file is part of GNU Emacs.

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

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

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

;;; Commentary:

;; Internet Relay Chat (IRC) is a form of instant communication over
;; the Internet. It is mainly designed for group (many-to-many)
;; communication in discussion forums called channels, but also allows
;; one-to-one communication.

;; Rcirc has simple defaults and clear and consistent behavior.
;; Message arrival timestamps, activity notification on the mode line,
;; message filling, nick completion, and keepalive pings are all
;; enabled by default, but can easily be adjusted or turned off.  Each
;; discussion takes place in its own buffer and there is a single
;; server buffer per connection.

;; Open a new irc connection with:
;; M-x irc RET

;;; Todo:

;;; Code:

(require 'cl-lib)
(require 'ring)
(require 'time-date)
(require 'subr-x)

(defgroup rcirc nil
  "Simple IRC client."
  :version "22.1"
  :prefix "rcirc-"
  :link '(custom-manual "(rcirc)")
  :group 'applications)

(defcustom rcirc-server-alist
  '(("irc.freenode.net" :channels ("#rcirc")
     ;; Don't use the TLS port by default, in case gnutls is not available.
     ;; :port 7000 :encryption tls
     ))
  "An alist of IRC connections to establish when running `rcirc'.
Each element looks like (SERVER-NAME PARAMETERS).

SERVER-NAME is a string describing the server to connect
to.

The optional PARAMETERS come in pairs PARAMETER VALUE.

The following parameters are recognized:

`:nick'

VALUE must be a string.  If absent, `rcirc-default-nick' is used
for this connection.

`:port'

VALUE must be a number or string.  If absent,
`rcirc-default-port' is used.

`:user-name'

VALUE must be a string.  If absent, `rcirc-default-user-name' is
used.

`:password'

VALUE must be a string.  If absent, no PASS command will be sent
to the server.

`:full-name'

VALUE must be a string.  If absent, `rcirc-default-full-name' is
used.

`:channels'

VALUE must be a list of strings describing which channels to join
when connecting to this server.  If absent, no channels will be
connected to automatically.

`:encryption'

VALUE must be `plain' (the default) for unencrypted connections, or `tls'
for connections using SSL/TLS.

`:server-alias'

VALUE must be a string that will be used instead of the server name for
display purposes. If absent, the real server name will be displayed instead."
  :type '(alist :key-type string
		:value-type (plist :options
                                   ((:nick string)
                                    (:port integer)
                                    (:user-name string)
                                    (:password string)
                                    (:full-name string)
                                    (:channels (repeat string))
                                    (:encryption (choice (const tls)
                                                         (const plain)))
                                    (:server-alias string))))
  :group 'rcirc)

(defcustom rcirc-default-port 6667
  "The default port to connect to."
  :type 'integer
  :group 'rcirc)

(defcustom rcirc-default-nick (user-login-name)
  "Your nick."
  :type 'string
  :group 'rcirc)

(defcustom rcirc-default-user-name "user"
  "Your user name sent to the server when connecting."
  :version "24.1"                       ; changed default
  :type 'string
  :group 'rcirc)

(defcustom rcirc-default-full-name "unknown"
  "The full name sent to the server when connecting."
  :version "24.1"                       ; changed default
  :type 'string
  :group 'rcirc)

(defcustom rcirc-fill-flag t
  "Non-nil means line-wrap messages printed in channel buffers."
  :type 'boolean
  :group 'rcirc)

(defcustom rcirc-fill-column nil
  "Column beyond which automatic line-wrapping should happen.
If nil, use value of `fill-column'.
If a function (e.g., `frame-text-width' or `window-text-width'),
call it to compute the number of columns."
  :risky t                              ; can get funcalled
  :type '(choice (const :tag "Value of `fill-column'" nil)
		 (integer :tag "Number of columns")
		 (function :tag "Function returning the number of columns"))
  :group 'rcirc)

(defcustom rcirc-fill-prefix nil
  "Text to insert before filled lines.
If nil, calculate the prefix dynamically to line up text
underneath each nick."
  :type '(choice (const :tag "Dynamic" nil)
		 (string :tag "Prefix text"))
  :group 'rcirc)

(defvar rcirc-ignore-buffer-activity-flag nil
  "If non-nil, ignore activity in this buffer.")
(make-variable-buffer-local 'rcirc-ignore-buffer-activity-flag)

(defvar rcirc-low-priority-flag nil
  "If non-nil, activity in this buffer is considered low priority.")
(make-variable-buffer-local 'rcirc-low-priority-flag)

(defcustom rcirc-omit-responses
  '("JOIN" "PART" "QUIT" "NICK")
  "Responses which will be hidden when `rcirc-omit-mode' is enabled."
  :type '(repeat string)
  :group 'rcirc)

(defvar rcirc-prompt-start-marker nil)

(define-minor-mode rcirc-omit-mode
  "Toggle the hiding of \"uninteresting\" lines.
With a prefix argument ARG, enable Rcirc-Omit mode if ARG is
positive, and disable it otherwise. If called from Lisp, enable
the mode if ARG is omitted or nil.

Uninteresting lines are those whose responses are listed in
`rcirc-omit-responses'."
  nil " Omit" nil
  (if rcirc-omit-mode
      (progn
	(add-to-invisibility-spec '(rcirc-omit . nil))
	(message "Rcirc-Omit mode enabled"))
    (remove-from-invisibility-spec '(rcirc-omit . nil))
    (message "Rcirc-Omit mode disabled"))
  (dolist (window (get-buffer-window-list (current-buffer)))
    (with-selected-window window
      (recenter (when (> (point) rcirc-prompt-start-marker) -1)))))

(defcustom rcirc-time-format "%H:%M "
  "Describes how timestamps are printed.
Used as the first arg to `format-time-string'."
  :type 'string
  :group 'rcirc)

(defcustom rcirc-input-ring-size 1024
  "Size of input history ring."
  :type 'integer
  :group 'rcirc)

(defcustom rcirc-read-only-flag t
  "Non-nil means make text in IRC buffers read-only."
  :type 'boolean
  :group 'rcirc)

(defcustom rcirc-buffer-maximum-lines nil
  "The maximum size in lines for rcirc buffers.
Channel buffers are truncated from the top to be no greater than this
number.  If zero or nil, no truncating is done."
  :type '(choice (const :tag "No truncation" nil)
		 (integer :tag "Number of lines"))
  :group 'rcirc)

(defcustom rcirc-scroll-show-maximum-output t
  "If non-nil, scroll buffer to keep the point at the bottom of
the window."
  :type 'boolean
  :group 'rcirc)

(defcustom rcirc-authinfo nil
  "List of authentication passwords.
Each element of the list is a list with a SERVER-REGEXP string
and a method symbol followed by method specific arguments.

The valid METHOD symbols are `nickserv', `chanserv' and
`bitlbee'.

The ARGUMENTS for each METHOD symbol are:
  `nickserv': NICK PASSWORD [NICKSERV-NICK]
  `chanserv': NICK CHANNEL PASSWORD
  `bitlbee': NICK PASSWORD
  `quakenet': ACCOUNT PASSWORD

Examples:
 ((\"freenode\" nickserv \"bob\" \"p455w0rd\")
  (\"freenode\" chanserv \"bob\" \"#bobland\" \"passwd99\")
  (\"bitlbee\" bitlbee \"robert\" \"sekrit\")
  (\"dal.net\" nickserv \"bob\" \"sekrit\" \"NickServ@services.dal.net\")
  (\"quakenet.org\" quakenet \"bobby\" \"sekrit\"))"
  :type '(alist :key-type (string :tag "Server")
		:value-type (choice (list :tag "NickServ"
					  (const nickserv)
					  (string :tag "Nick")
					  (string :tag "Password"))
				    (list :tag "ChanServ"
					  (const chanserv)
					  (string :tag "Nick")
					  (string :tag "Channel")
					  (string :tag "Password"))
				    (list :tag "BitlBee"
					  (const bitlbee)
					  (string :tag "Nick")
					  (string :tag "Password"))
                                    (list :tag "QuakeNet"
                                          (const quakenet)
                                          (string :tag "Account")
                                          (string :tag "Password"))))
  :group 'rcirc)

(defcustom rcirc-auto-authenticate-flag t
  "Non-nil means automatically send authentication string to server.
See also `rcirc-authinfo'."
  :type 'boolean
  :group 'rcirc)

(defcustom rcirc-authenticate-before-join t
  "Non-nil means authenticate to services before joining channels.
Currently only works with NickServ on some networks."
  :version "24.1"
  :type 'boolean
  :group 'rcirc)

(defcustom rcirc-prompt "> "
  "Prompt string to use in IRC buffers.

The following replacements are made:
%n is your nick.
%s is the server.
%t is the buffer target, a channel or a user.

Setting this alone will not affect the prompt;
use either M-x customize or also call `rcirc-update-prompt'."
  :type 'string
  :set 'rcirc-set-changed
  :initialize 'custom-initialize-default
  :group 'rcirc)

(defcustom rcirc-keywords nil
  "List of keywords to highlight in message text."
  :type '(repeat string)
  :group 'rcirc)

(defcustom rcirc-ignore-list ()
  "List of ignored nicks.
Use /ignore to list them, use /ignore NICK to add or remove a nick."
  :type '(repeat string)
  :group 'rcirc)

(defvar rcirc-ignore-list-automatic ()
  "List of ignored nicks added to `rcirc-ignore-list' because of renaming.
When an ignored person renames, their nick is added to both lists.
Nicks will be removed from the automatic list on follow-up renamings or
parts.")

(defcustom rcirc-bright-nicks nil
  "List of nicks to be emphasized.
See `rcirc-bright-nick' face."
  :type '(repeat string)
  :group 'rcirc)

(defcustom rcirc-dim-nicks nil
  "List of nicks to be deemphasized.
See `rcirc-dim-nick' face."
  :type '(repeat string)
  :group 'rcirc)

(define-obsolete-variable-alias 'rcirc-print-hooks
  'rcirc-print-functions "24.3")
(defcustom rcirc-print-functions nil
  "Hook run after text is printed.
Called with 5 arguments, PROCESS, SENDER, RESPONSE, TARGET and TEXT."
  :type 'hook
  :group 'rcirc)

(defvar rcirc-authenticated-hook nil
  "Hook run after successfully authenticated.")

(defcustom rcirc-always-use-server-buffer-flag nil
  "Non-nil means messages without a channel target will go to the server buffer."
  :type 'boolean
  :group 'rcirc)

(defcustom rcirc-decode-coding-system 'utf-8
  "Coding system used to decode incoming irc messages.
Set to `undecided' if you want the encoding of the incoming
messages autodetected."
  :type 'coding-system
  :group 'rcirc)

(defcustom rcirc-encode-coding-system 'utf-8
  "Coding system used to encode outgoing irc messages."
  :type 'coding-system
  :group 'rcirc)

(defcustom rcirc-coding-system-alist nil
  "Alist to decide a coding system to use for a channel I/O operation.
The format is ((PATTERN . VAL) ...).
PATTERN is either a string or a cons of strings.
If PATTERN is a string, it is used to match a target.
If PATTERN is a cons of strings, the car part is used to match a
target, and the cdr part is used to match a server.
VAL is either a coding system or a cons of coding systems.
If VAL is a coding system, it is used for both decoding and encoding
messages.
If VAL is a cons of coding systems, the car part is used for decoding,
and the cdr part is used for encoding."
  :type '(alist :key-type (choice (string :tag "Channel Regexp")
					  (cons (string :tag "Channel Regexp")
						(string :tag "Server Regexp")))
		:value-type (choice coding-system
				    (cons (coding-system :tag "Decode")
					  (coding-system :tag "Encode"))))
  :group 'rcirc)

(defcustom rcirc-multiline-major-mode 'fundamental-mode
  "Major-mode function to use in multiline edit buffers."
  :type 'function
  :group 'rcirc)

(defcustom rcirc-nick-completion-format "%s: "
  "Format string to use in nick completions.

The format string is only used when completing at the beginning
of a line.  The string is passed as the first argument to
`format' with the nickname as the second argument."
  :version "24.1"
  :type 'string
  :group 'rcirc)

(defcustom rcirc-kill-channel-buffers nil
  "When non-nil, kill channel buffers when the server buffer is killed.
Only the channel buffers associated with the server in question
will be killed."
  :version "24.3"
  :type 'boolean
  :group 'rcirc)

(defvar rcirc-nick nil)

(defvar rcirc-prompt-end-marker nil)

(defvar rcirc-nick-table nil)

(defvar rcirc-recent-quit-alist nil
  "Alist of nicks that have recently quit or parted the channel.")

(defvar rcirc-nick-syntax-table
  (let ((table (make-syntax-table text-mode-syntax-table)))
    (mapc (lambda (c) (modify-syntax-entry c "w" table))
          "[]\\`_^{|}-")
    (modify-syntax-entry ?' "_" table)
    table)
  "Syntax table which includes all nick characters as word constituents.")

;; each process has an alist of (target . buffer) pairs
(defvar rcirc-buffer-alist nil)

(defvar rcirc-activity nil
  "List of buffers with unviewed activity.")

(defvar rcirc-activity-string ""
  "String displayed in mode line representing `rcirc-activity'.")
(put 'rcirc-activity-string 'risky-local-variable t)

(defvar rcirc-server-buffer nil
  "The server buffer associated with this channel buffer.")

(defvar rcirc-target nil
  "The channel or user associated with this buffer.")

(defvar rcirc-urls nil
  "List of URLs seen in the current buffer and their start positions.")
(put 'rcirc-urls 'permanent-local t)

(defvar rcirc-timeout-seconds 600
  "Kill connection after this many seconds if there is no activity.")

(defconst rcirc-id-string (concat "rcirc on GNU Emacs " emacs-version))

(defvar rcirc-startup-channels nil)

(defvar rcirc-server-name-history nil
  "History variable for \\[rcirc] call.")

(defvar rcirc-server-port-history nil
  "History variable for \\[rcirc] call.")

(defvar rcirc-nick-name-history nil
  "History variable for \\[rcirc] call.")

(defvar rcirc-user-name-history nil
  "History variable for \\[rcirc] call.")

(defvar rcirc-last-message-time nil)

;;;###autoload
(defun rcirc (arg)
  "Connect to all servers in `rcirc-server-alist'.

Do not connect to a server if it is already connected.

If ARG is non-nil, instead prompt for connection parameters."
  (interactive "P")
  (if arg
      (let* ((server (completing-read "IRC Server: "
				      rcirc-server-alist
				      nil nil
				      (caar rcirc-server-alist)
				      'rcirc-server-name-history))
	     (server-plist (cdr (assoc-string server rcirc-server-alist)))
	     (port (read-string "IRC Port: "
				(number-to-string
				 (or (plist-get server-plist :port)
				     rcirc-default-port))
				'rcirc-server-port-history))
	     (nick (read-string "IRC Nick: "
				(or (plist-get server-plist :nick)
				    rcirc-default-nick)
				'rcirc-nick-name-history))
	     (user-name (read-string "IRC Username: "
                                     (or (plist-get server-plist :user-name)
                                         rcirc-default-user-name)
                                     'rcirc-user-name-history))
	     (password (read-passwd "IRC Password: " nil
                                    (plist-get server-plist :password)))
	     (channels (split-string
			(read-string "IRC Channels: "
				     (mapconcat 'identity
						(plist-get server-plist
							   :channels)
						" "))
			"[, ]+" t))
             (encryption (rcirc-prompt-for-encryption server-plist)))
	(rcirc-connect server port nick user-name
		       rcirc-default-full-name
		       channels password encryption))
    ;; connect to servers in `rcirc-server-alist'
    (let (connected-servers)
      (dolist (c rcirc-server-alist)
	(let ((server (car c))
	      (nick (or (plist-get (cdr c) :nick) rcirc-default-nick))
	      (port (or (plist-get (cdr c) :port) rcirc-default-port))
	      (user-name (or (plist-get (cdr c) :user-name)
			     rcirc-default-user-name))
	      (full-name (or (plist-get (cdr c) :full-name)
			     rcirc-default-full-name))
	      (channels (plist-get (cdr c) :channels))
              (password (plist-get (cdr c) :password))
              (encryption (plist-get (cdr c) :encryption))
              (server-alias (plist-get (cdr c) :server-alias))
              contact)
	  (when server
	    (let (connected)
	      (dolist (p (rcirc-process-list))
		(when (string= (or server-alias server) (process-name p))
		  (setq connected p)))
	      (if (not connected)
		  (condition-case nil
		      (rcirc-connect server port nick user-name
                                     full-name channels password encryption
                                     server-alias)
		    (quit (message "Quit connecting to %s"
                                   (or server-alias server))))
		(with-current-buffer (process-buffer connected)
                  (setq contact (process-contact
                                 (get-buffer-process (current-buffer)) :name))
                  (setq connected-servers
                        (cons (if (stringp contact)
                                  contact (or server-alias server))
                              connected-servers))))))))
      (when connected-servers
	(message "Already connected to %s"
		 (if (cdr connected-servers)
		     (concat (mapconcat 'identity (butlast connected-servers) ", ")
			     ", and "
			     (car (last connected-servers)))
		   (car connected-servers)))))))

;;;###autoload
(defalias 'irc 'rcirc)


(defvar rcirc-process-output nil)
(defvar rcirc-topic nil)
(defvar rcirc-keepalive-timer nil)
(defvar rcirc-last-server-message-time nil)
(defvar rcirc-server nil)		; server provided by server
(defvar rcirc-server-name nil)		; server name given by 001 response
(defvar rcirc-timeout-timer nil)
(defvar rcirc-user-authenticated nil)
(defvar rcirc-user-disconnect nil)
(defvar rcirc-connecting nil)
(defvar rcirc-connection-info nil)
(defvar rcirc-process nil)

;;;###autoload
(defun rcirc-connect (server &optional port nick user-name
                             full-name startup-channels password encryption
                             server-alias)
  (save-excursion
    (message "Connecting to %s..." (or server-alias server))
    (let* ((inhibit-eol-conversion)
           (port-number (if port
			    (if (stringp port)
				(string-to-number port)
			      port)
			  rcirc-default-port))
	   (nick (or nick rcirc-default-nick))
	   (user-name (or user-name rcirc-default-user-name))
	   (full-name (or full-name rcirc-default-full-name))
	   (startup-channels startup-channels)
           (process (open-network-stream
                     (or server-alias server) nil server port-number
                     :type (or encryption 'plain))))
      ;; set up process
      (set-process-coding-system process 'raw-text 'raw-text)
      (switch-to-buffer (rcirc-generate-new-buffer-name process nil))
      (set-process-buffer process (current-buffer))
      (rcirc-mode process nil)
      (set-process-sentinel process 'rcirc-sentinel)
      (set-process-filter process 'rcirc-filter)

      (setq-local rcirc-connection-info
		  (list server port nick user-name full-name startup-channels
			password encryption server-alias))
      (setq-local rcirc-process process)
      (setq-local rcirc-server server)
      (setq-local rcirc-server-name
                  (or server-alias server)) ; Update when we get 001 response.
      (setq-local rcirc-buffer-alist nil)
      (setq-local rcirc-nick-table (make-hash-table :test 'equal))
      (setq-local rcirc-nick nick)
      (setq-local rcirc-process-output nil)
      (setq-local rcirc-startup-channels startup-channels)
      (setq-local rcirc-last-server-message-time (current-time))

      (setq-local rcirc-timeout-timer nil)
      (setq-local rcirc-user-disconnect nil)
      (setq-local rcirc-user-authenticated nil)
      (setq-local rcirc-connecting t)

      (add-hook 'auto-save-hook 'rcirc-log-write)

      ;; identify
      (unless (zerop (length password))
        (rcirc-send-string process (concat "PASS " password)))
      (rcirc-send-string process (concat "NICK " nick))
      (rcirc-send-string process "CAP LS 302")
      (rcirc-send-string process (concat "USER " user-name
                                         " 0 * :" full-name))

      ;; setup ping timer if necessary
      (unless rcirc-keepalive-timer
	(setq rcirc-keepalive-timer
	      (run-at-time 0 (/ rcirc-timeout-seconds 2) 'rcirc-keepalive)))

      (message "Connecting to %s...done" (or server-alias server))

      ;; return process object
      process)))

(defmacro with-rcirc-process-buffer (process &rest body)
  (declare (indent 1) (debug t))
  `(with-current-buffer (process-buffer ,process)
     ,@body))

(defmacro with-rcirc-server-buffer (&rest body)
  (declare (indent 0) (debug t))
  `(with-current-buffer rcirc-server-buffer
     ,@body))

(define-obsolete-function-alias 'rcirc-float-time 'float-time "26.1")

(defun rcirc-prompt-for-encryption (server-plist)
  "Prompt the user for the encryption method to use.
SERVER-PLIST is the property list for the server."
  (let ((msg "Encryption (default %s): ")
        (choices '("plain" "tls"))
        (default (or (plist-get server-plist :encryption)
                     'plain)))
    (intern
     (completing-read (format msg default)
                      choices nil t nil nil (symbol-name default)))))

(defun rcirc-keepalive ()
  "Send keep alive pings to active rcirc processes.
Kill processes that have not received a server message since the
last ping."
  (if (rcirc-process-list)
      (mapc (lambda (process)
	      (with-rcirc-process-buffer process
		(when (not rcirc-connecting)
                  (rcirc-send-ctcp process
                                   rcirc-nick
                                   (format "KEEPALIVE %f"
                                           (float-time))))))
            (rcirc-process-list))
    ;; no processes, clean up timer
    (when (timerp rcirc-keepalive-timer)
      (cancel-timer rcirc-keepalive-timer))
    (setq rcirc-keepalive-timer nil)))

(defun rcirc-handler-ctcp-KEEPALIVE (process _target _sender message)
  (with-rcirc-process-buffer process
    (setq header-line-format (format "%f" (- (float-time)
					     (string-to-number message))))))

(defvar rcirc-debug-buffer "*rcirc debug*")
(defvar rcirc-debug-flag nil
  "If non-nil, write information to `rcirc-debug-buffer'.")
(defun rcirc-debug (process text)
  "Add an entry to the debug log including PROCESS and TEXT.
Debug text is written to `rcirc-debug-buffer' if `rcirc-debug-flag'
is non-nil."
  (when rcirc-debug-flag
    (with-current-buffer (get-buffer-create rcirc-debug-buffer)
      (goto-char (point-max))
      (insert (concat
	       "["
	       (format-time-string "%Y-%m-%dT%T ") (process-name process)
	       "] "
	       text)))))

(define-obsolete-variable-alias 'rcirc-sentinel-hooks
  'rcirc-sentinel-functions "24.3")
(defvar rcirc-sentinel-functions nil
  "Hook functions called when the process sentinel is called.
Functions are called with PROCESS and SENTINEL arguments.")

(defcustom rcirc-reconnect-delay 0
  "The minimum interval in seconds between reconnect attempts.
When 0, do not auto-reconnect."
  :version "25.1"
  :type 'integer
  :group 'rcirc)

(defvar rcirc-last-connect-time nil
  "The last time the buffer was connected.")

(defun rcirc-sentinel (process sentinel)
  "Called when PROCESS receives SENTINEL."
  (let ((sentinel (replace-regexp-in-string "\n" "" sentinel)))
    (rcirc-debug process (format "SENTINEL: %S %S\n" process sentinel))
    (with-rcirc-process-buffer process
      (dolist (buffer (cons nil (mapcar 'cdr rcirc-buffer-alist)))
	(with-current-buffer (or buffer (current-buffer))
	  (rcirc-print process "rcirc.el" "ERROR" rcirc-target
		       (format "%s: %s (%S)"
			       (process-name process)
			       sentinel
			       (process-status process))
                       (not rcirc-target))
	  (rcirc-disconnect-buffer)))
      (when (and (string= sentinel "deleted")
                 (< 0 rcirc-reconnect-delay))
        (let ((now (current-time)))
          (when (or (null rcirc-last-connect-time)
                    (< rcirc-reconnect-delay
                       (float-time (time-subtract now rcirc-last-connect-time))))
            (setq rcirc-last-connect-time now)
            (rcirc-cmd-reconnect nil))))
      (run-hook-with-args 'rcirc-sentinel-functions process sentinel))))

(defun rcirc-disconnect-buffer (&optional buffer)
  (with-current-buffer (or buffer (current-buffer))
    ;; set rcirc-target to nil for each channel so cleanup
    ;; doesn't happen when we reconnect
    (setq rcirc-target nil)
    (setq mode-line-process ":disconnected")))

(defun rcirc-process-list ()
  "Return a list of rcirc processes."
  (let (ps)
    (mapc (lambda (p)
            (when (buffer-live-p (process-buffer p))
              (with-rcirc-process-buffer p
                (when (eq major-mode 'rcirc-mode)
                  (setq ps (cons p ps))))))
          (process-list))
    ps))

(define-obsolete-variable-alias 'rcirc-receive-message-hooks
  'rcirc-receive-message-functions "24.3")
(defvar rcirc-receive-message-functions nil
  "Hook functions run when a message is received from server.
Function is called with PROCESS, COMMAND, SENDER, ARGS and LINE.")
(defun rcirc-filter (process output)
  "Called when PROCESS receives OUTPUT."
  (rcirc-debug process output)
  (rcirc-reschedule-timeout process)
  (with-rcirc-process-buffer process
    (setq rcirc-last-server-message-time (current-time))
    (setq rcirc-process-output (concat rcirc-process-output output))
    (when (= ?\n (aref rcirc-process-output
                       (1- (length rcirc-process-output))))
      (let ((lines (split-string rcirc-process-output "[\n\r]" t)))
        (setq rcirc-process-output nil)
        (dolist (line lines)
          (rcirc-process-server-response process line))))))

(defun rcirc-reschedule-timeout (process)
  (with-rcirc-process-buffer process
    (when (not rcirc-connecting)
      (with-rcirc-process-buffer process
	(when rcirc-timeout-timer (cancel-timer rcirc-timeout-timer))
	(setq rcirc-timeout-timer (run-at-time rcirc-timeout-seconds nil
					       'rcirc-delete-process
					       process))))))

(defun rcirc-delete-process (process)
  (delete-process process))

(defvar rcirc-trap-errors-flag t)
(defun rcirc-process-server-response (process text)
  (if rcirc-trap-errors-flag
      (condition-case err
          (rcirc-process-server-response-1 process text)
        (error
         (rcirc-print process "RCIRC" "ERROR" nil
                      (format "\"%s\" %s" text err) t)))
    (rcirc-process-server-response-1 process text)))

(defun rcirc-handle-message-tags (tags)
  (if-let* ((time (cdr (assoc "time" tags)))
            (timestamp (floor (float-time (date-to-time time)))))
      (setq rcirc-last-message-time timestamp)))

(defun rcirc-parse-tags (tags)
  "Parse TAGS message prefix."
  (mapcar (lambda (tag)
            (let ((p (split-string tag "=")))
              `(,(car p) . ,(cadr p))))
          (split-string tags ";")))

(defun rcirc-process-server-response-1 (process text)

  ;; attempt to extract and handle IRCv3 message tags (which contain server-time)
  (if (string-match "^\\(@\\([^ ]+\\) \\)?\\(\\(:[^ ]+ \\)?[^ ]+ .+\\)$" text)
      (let ((tags (match-string 2 text))
            (rest (match-string 3 text)))
        (when tags
          (rcirc-handle-message-tags (rcirc-parse-tags tags)))
        (setq text rest)))

  (if (string-match "^\\(:\\([^ ]+\\) \\)?\\([^ ]+\\) \\(.+\\)$" text)
      (let* ((user (match-string 2 text))
	     (sender (rcirc-user-nick user))
             (cmd (match-string 3 text))
             (args (match-string 4 text))
             (handler (intern-soft (concat "rcirc-handler-" cmd))))
        (string-match "^\\([^:]*\\):?\\(.+\\)?$" args)
        (let* ((args1 (match-string 1 args))
               (args2 (match-string 2 args))
               (args (delq nil (append (split-string args1 " " t)
				       (list args2)))))
          (if (not (fboundp handler))
              (rcirc-handler-generic process cmd sender args text)
            (funcall handler process sender args text))
          (run-hook-with-args 'rcirc-receive-message-functions
                              process cmd sender args text)))
    (message "UNHANDLED: %s" text)))

(defvar rcirc-responses-no-activity '("305" "306")
  "Responses that don't trigger activity in the mode-line indicator.")

(defun rcirc-handler-generic (process response sender args _text)
  "Generic server response handler."
  (rcirc-print process sender response nil
               (mapconcat 'identity (cdr args) " ")
	       (not (member response rcirc-responses-no-activity))))

(defun rcirc--connection-open-p (process)
  (memq (process-status process) '(run open)))

(defun rcirc-send-string (process string)
  "Send PROCESS a STRING plus a newline."
  (let ((string (concat (encode-coding-string string rcirc-encode-coding-system)
                        "\n")))
    (unless (rcirc--connection-open-p process)
      (error "Network connection to %s is not open"
             (process-name process)))
    (rcirc-debug process string)
    (process-send-string process string)))

(defun rcirc-send-privmsg (process target string)
  (rcirc-send-string process (format "PRIVMSG %s :%s" target string)))

(defun rcirc-send-ctcp (process target request &optional args)
  (let ((args (if args (concat " " args) "")))
    (rcirc-send-privmsg process target
                        (format "\C-a%s%s\C-a" request args))))

(defun rcirc-buffer-process (&optional buffer)
  "Return the process associated with channel BUFFER.
With no argument or nil as argument, use the current buffer."
  (let ((buffer (or buffer (and (buffer-live-p rcirc-server-buffer)
				rcirc-server-buffer))))
    (if buffer
        (with-current-buffer buffer rcirc-process)
      rcirc-process)))

(defun rcirc-server-name (process)
  "Return PROCESS server name, given by the 001 response."
  (with-rcirc-process-buffer process
    (or rcirc-server-name
	(warn "server name for process %S unknown" process))))

(defun rcirc-nick (process)
  "Return PROCESS nick."
  (with-rcirc-process-buffer process
    (or rcirc-nick rcirc-default-nick)))

(defun rcirc-buffer-nick (&optional buffer)
  "Return the nick associated with BUFFER.
With no argument or nil as argument, use the current buffer."
  (with-current-buffer (or buffer (current-buffer))
    (with-current-buffer rcirc-server-buffer
      (or rcirc-nick rcirc-default-nick))))

(defvar rcirc-max-message-length 420
  "Messages longer than this value will be split.")

(defun rcirc-split-message (message)
  "Split MESSAGE into chunks within `rcirc-max-message-length'."
  ;; `rcirc-encode-coding-system' can have buffer-local value.
  (let ((encoding rcirc-encode-coding-system))
    (with-temp-buffer
      (insert message)
      (goto-char (point-min))
      (let (result)
	(while (not (eobp))
	  (goto-char (or (byte-to-position rcirc-max-message-length)
			 (point-max)))
	  ;; max message length is 512 including CRLF
	  (while (and (not (bobp))
		      (> (length (encode-coding-region
				  (point-min) (point) encoding t))
			 rcirc-max-message-length))
	    (forward-char -1))
	  (push (delete-and-extract-region (point-min) (point)) result))
	(nreverse result)))))

(defun rcirc-send-message (process target message &optional noticep silent)
  "Send TARGET associated with PROCESS a privmsg with text MESSAGE.
If NOTICEP is non-nil, send a notice instead of privmsg.
If SILENT is non-nil, do not print the message in any irc buffer."
  (let ((response (if noticep "NOTICE" "PRIVMSG")))
    (rcirc-get-buffer-create process target)
    (dolist (msg (rcirc-split-message message))
      (rcirc-send-string process (concat response " " target " :" msg))
      (unless silent
	(rcirc-print process (rcirc-nick process) response target msg)))))

(defvar rcirc-input-ring nil)
(defvar rcirc-input-ring-index 0)

(defun rcirc-prev-input-string (arg)
  (ring-ref rcirc-input-ring (+ rcirc-input-ring-index arg)))

(defun rcirc-insert-prev-input ()
  (interactive)
  (when (<= rcirc-prompt-end-marker (point))
    (delete-region rcirc-prompt-end-marker (point-max))
    (insert (rcirc-prev-input-string 0))
    (setq rcirc-input-ring-index (1+ rcirc-input-ring-index))))

(defun rcirc-insert-next-input ()
  (interactive)
  (when (<= rcirc-prompt-end-marker (point))
    (delete-region rcirc-prompt-end-marker (point-max))
    (setq rcirc-input-ring-index (1- rcirc-input-ring-index))
    (insert (rcirc-prev-input-string -1))))

(defvar rcirc-server-commands
  '("/admin"   "/away"   "/connect" "/die"      "/error"   "/info"
    "/invite"  "/ison"   "/join"    "/kick"     "/kill"    "/links"
    "/list"    "/lusers" "/mode"    "/motd"     "/names"   "/nick"
    "/notice"  "/oper"   "/part"    "/pass"     "/ping"    "/pong"
    "/privmsg" "/quit"   "/rehash"  "/restart"  "/service" "/servlist"
    "/server"  "/squery" "/squit"   "/stats"    "/summon"  "/time"
    "/topic"   "/trace"  "/user"    "/userhost" "/users"   "/version"
    "/wallops" "/who"    "/whois"   "/whowas")
  "A list of user commands by IRC server.
The value defaults to RFCs 1459 and 2812.")

;; /me and /ctcp are not defined by `defun-rcirc-command'.
(defvar rcirc-client-commands '("/me" "/ctcp")
  "A list of user commands defined by IRC client rcirc.
The list is updated automatically by `defun-rcirc-command'.")

(defun rcirc-completion-at-point ()
  "Function used for `completion-at-point-functions' in `rcirc-mode'."
  (and (rcirc-looking-at-input)
       (let* ((beg (save-excursion
                     ;; On some networks it is common to message or
                     ;; mention someone using @nick instead of just
                     ;; nick.
		     (if (re-search-backward "[[:space:]@]" rcirc-prompt-end-marker t)
			 (1+ (point))
		       rcirc-prompt-end-marker)))
	      (table (if (and (= beg rcirc-prompt-end-marker)
			      (eq (char-after beg) ?/))
			 (delete-dups
			  (nconc (sort (copy-sequence rcirc-client-commands)
				       'string-lessp)
				 (sort (copy-sequence rcirc-server-commands)
				       'string-lessp)))
		       (rcirc-channel-nicks (rcirc-buffer-process)
					    rcirc-target))))
	 (list beg (point) table))))

(defvar rcirc-completions nil)
(defvar rcirc-completion-start nil)

(defun rcirc-complete ()
  "Cycle through completions from list of nicks in channel or IRC commands.
IRC command completion is performed only if `/' is the first input char."
  (interactive)
  (unless (rcirc-looking-at-input)
    (error "Point not located after rcirc prompt"))
  (if (eq last-command this-command)
      (setq rcirc-completions
	    (append (cdr rcirc-completions) (list (car rcirc-completions))))
    (let ((completion-ignore-case t)
	  (table (rcirc-completion-at-point)))
      (setq rcirc-completion-start (car table))
      (setq rcirc-completions
	    (and rcirc-completion-start
		 (all-completions (buffer-substring rcirc-completion-start
						    (cadr table))
				  (nth 2 table))))))
  (let ((completion (car rcirc-completions)))
    (when completion
      (delete-region rcirc-completion-start (point))
      (insert
       (cond
        ((= (aref completion 0) ?/) (concat completion " "))
        ((= rcirc-completion-start rcirc-prompt-end-marker)
         (format rcirc-nick-completion-format completion))
        (t completion))))))

(defun set-rcirc-decode-coding-system (coding-system)
  "Set the decode coding system used in this channel."
  (interactive "zCoding system for incoming messages: ")
  (setq-local rcirc-decode-coding-system coding-system))

(defun set-rcirc-encode-coding-system (coding-system)
  "Set the encode coding system used in this channel."
  (interactive "zCoding system for outgoing messages: ")
  (setq-local rcirc-encode-coding-system coding-system))

(defvar rcirc-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map (kbd "RET") 'rcirc-send-input)
    (define-key map (kbd "M-p") 'rcirc-insert-prev-input)
    (define-key map (kbd "M-n") 'rcirc-insert-next-input)
    (define-key map (kbd "TAB") 'rcirc-complete)
    (define-key map (kbd "C-c C-b") 'rcirc-browse-url)
    (define-key map (kbd "C-c C-c") 'rcirc-edit-multiline)
    (define-key map (kbd "C-c C-j") 'rcirc-cmd-join)
    (define-key map (kbd "C-c C-k") 'rcirc-cmd-kick)
    (define-key map (kbd "C-c C-l") 'rcirc-toggle-low-priority)
    (define-key map (kbd "C-c C-d") 'rcirc-cmd-mode)
    (define-key map (kbd "C-c C-m") 'rcirc-cmd-msg)
    (define-key map (kbd "C-c C-r") 'rcirc-cmd-nick) ; rename
    (define-key map (kbd "C-c C-o") 'rcirc-omit-mode)
    (define-key map (kbd "C-c C-p") 'rcirc-cmd-part)
    (define-key map (kbd "C-c C-q") 'rcirc-cmd-query)
    (define-key map (kbd "C-c C-t") 'rcirc-cmd-topic)
    (define-key map (kbd "C-c C-n") 'rcirc-cmd-names)
    (define-key map (kbd "C-c C-w") 'rcirc-cmd-whois)
    (define-key map (kbd "C-c C-x") 'rcirc-cmd-quit)
    (define-key map (kbd "C-c TAB") ; C-i
      'rcirc-toggle-ignore-buffer-activity)
    (define-key map (kbd "C-c C-s") 'rcirc-switch-to-server-buffer)
    (define-key map (kbd "C-c C-a") 'rcirc-jump-to-first-unread-line)
    map)
  "Keymap for rcirc mode.")

(defvar rcirc-short-buffer-name nil
  "Generated abbreviation to use to indicate buffer activity.")

(defvar rcirc-mode-hook nil
  "Hook run when setting up rcirc buffer.")

(defvar rcirc-last-post-time nil)

(defvar rcirc-log-alist nil
  "Alist of lines to log to disk when `rcirc-log-flag' is non-nil.
Each element looks like (FILENAME . TEXT).")

(defvar rcirc-current-line 0
  "The current number of responses printed in this channel.
This number is independent of the number of lines in the buffer.")

(defun rcirc-mode (process target)
  ;; FIXME: Use define-derived-mode.
  "Major mode for IRC channel buffers.

\\{rcirc-mode-map}"
  (kill-all-local-variables)
  (use-local-map rcirc-mode-map)
  (setq mode-name "rcirc")
  (setq major-mode 'rcirc-mode)
  (setq mode-line-process nil)

  (setq-local rcirc-input-ring
	      ;; If rcirc-input-ring is already a ring with desired
	      ;; size do not re-initialize.
	      (if (and (ring-p rcirc-input-ring)
		       (= (ring-size rcirc-input-ring)
			  rcirc-input-ring-size))
		  rcirc-input-ring
		(make-ring rcirc-input-ring-size)))
  (setq-local rcirc-server-buffer (process-buffer process))
  (setq-local rcirc-target target)
  (setq-local rcirc-topic nil)
  (setq-local rcirc-last-post-time (current-time))
  (setq-local fill-paragraph-function 'rcirc-fill-paragraph)
  (setq-local rcirc-recent-quit-alist nil)
  (setq-local rcirc-current-line 0)
  (setq-local rcirc-last-connect-time (current-time))

  (use-hard-newlines t)
  (setq-local rcirc-short-buffer-name nil)
  (setq-local rcirc-urls nil)

  ;; setup for omitting responses
  (setq buffer-invisibility-spec '())
  (setq buffer-display-table (make-display-table))
  (set-display-table-slot buffer-display-table 4
			  (let ((glyph (make-glyph-code
					?. 'font-lock-keyword-face)))
			    (make-vector 3 glyph)))

  (dolist (i rcirc-coding-system-alist)
    (let ((chan (if (consp (car i)) (caar i) (car i)))
	  (serv (if (consp (car i)) (cdar i) "")))
      (when (and (string-match chan (or target ""))
		 (string-match serv (rcirc-server-name process)))
	(setq-local rcirc-decode-coding-system
		    (if (consp (cdr i)) (cadr i) (cdr i)))
        (setq-local rcirc-encode-coding-system
		    (if (consp (cdr i)) (cddr i) (cdr i))))))

  ;; setup the prompt and markers
  (setq-local rcirc-prompt-start-marker (point-max-marker))
  (setq-local rcirc-prompt-end-marker (point-max-marker))
  (rcirc-update-prompt)
  (goto-char rcirc-prompt-end-marker)

  (setq-local overlay-arrow-position (make-marker))

  ;; if the user changes the major mode or kills the buffer, there is
  ;; cleanup work to do
  (add-hook 'change-major-mode-hook 'rcirc-change-major-mode-hook nil t)
  (add-hook 'kill-buffer-hook 'rcirc-kill-buffer-hook nil t)

  ;; add to buffer list, and update buffer abbrevs
  (when target				; skip server buffer
    (let ((buffer (current-buffer)))
      (with-rcirc-process-buffer process
	(setq rcirc-buffer-alist (cons (cons target buffer)
				       rcirc-buffer-alist))))
    (rcirc-update-short-buffer-names))

  (add-hook 'completion-at-point-functions
            'rcirc-completion-at-point nil 'local)

  (run-mode-hooks 'rcirc-mode-hook))

(defun rcirc-update-prompt (&optional all)
  "Reset the prompt string in the current buffer.

If ALL is non-nil, update prompts in all IRC buffers."
  (if all
      (mapc (lambda (process)
	      (mapc (lambda (buffer)
		      (with-current-buffer buffer
			(rcirc-update-prompt)))
		    (with-rcirc-process-buffer process
		      (mapcar 'cdr rcirc-buffer-alist))))
	    (rcirc-process-list))
    (let ((inhibit-read-only t)
	  (prompt (or rcirc-prompt "")))
      (mapc (lambda (rep)
	      (setq prompt
		    (replace-regexp-in-string (car rep) (cdr rep) prompt)))
	    (list (cons "%n" (rcirc-buffer-nick))
		  (cons "%s" (with-rcirc-server-buffer rcirc-server-name))
		  (cons "%t" (or rcirc-target ""))))
      (save-excursion
	(delete-region rcirc-prompt-start-marker rcirc-prompt-end-marker)
	(goto-char rcirc-prompt-start-marker)
	(let ((start (point)))
	  (insert-before-markers prompt)
	  (set-marker rcirc-prompt-start-marker start)
	  (when (not (zerop (- rcirc-prompt-end-marker
			       rcirc-prompt-start-marker)))
	    (add-text-properties rcirc-prompt-start-marker
				 rcirc-prompt-end-marker
				 (list 'face 'rcirc-prompt
				       'read-only t 'field t
				       'front-sticky t 'rear-nonsticky t))))))))

(defun rcirc-set-changed (option value)
  "Set OPTION to VALUE and do updates after a customization change."
  (set-default option value)
  (cond ((eq option 'rcirc-prompt)
	 (rcirc-update-prompt 'all))
	(t
	 (error "Bad option %s" option))))

(defun rcirc-channel-p (target)
  "Return t if TARGET is a channel name."
  (and target
       (not (zerop (length target)))
       (or (eq (aref target 0) ?#)
           (eq (aref target 0) ?&))))

(defcustom rcirc-log-directory "~/.emacs.d/rcirc-log"
  "Directory to keep IRC logfiles."
  :type 'directory
  :group 'rcirc)

(defcustom rcirc-log-flag nil
  "Non-nil means log IRC activity to disk.
Logfiles are kept in `rcirc-log-directory'."
  :type 'boolean
  :group 'rcirc)

(defun rcirc-kill-buffer-hook ()
  "Part the channel when killing an rcirc buffer.

If `rcirc-kill-channel-buffers' is non-nil and the killed buffer
is a server buffer, kills all of the channel buffers associated
with it."
  (when (eq major-mode 'rcirc-mode)
    (when (and rcirc-log-flag
               rcirc-log-directory)
      (rcirc-log-write))
    (rcirc-clean-up-buffer "Killed buffer")
    (when (and rcirc-buffer-alist ;; it's a server buffer
               rcirc-kill-channel-buffers)
      (dolist (channel rcirc-buffer-alist)
	(kill-buffer (cdr channel))))))

(defun rcirc-change-major-mode-hook ()
  "Part the channel when changing the major-mode."
  (rcirc-clean-up-buffer "Changed major mode"))

(defun rcirc-clean-up-buffer (reason)
  (let ((buffer (current-buffer)))
    (rcirc-clear-activity buffer)
    (when (and (rcirc-buffer-process)
	       (rcirc--connection-open-p (rcirc-buffer-process)))
      (with-rcirc-server-buffer
       (setq rcirc-buffer-alist
	     (rassq-delete-all buffer rcirc-buffer-alist)))
      (rcirc-update-short-buffer-names)
      (if (rcirc-channel-p rcirc-target)
	  (rcirc-send-string (rcirc-buffer-process)
			     (concat "PART " rcirc-target " :" reason))
	(when rcirc-target
	  (rcirc-remove-nick-channel (rcirc-buffer-process)
				     (rcirc-buffer-nick)
				     rcirc-target))))
    (setq rcirc-target nil)))

(defun rcirc-generate-new-buffer-name (process target)
  "Return a buffer name based on PROCESS and TARGET.
This is used for the initial name given to IRC buffers."
  (substring-no-properties
   (if target
       (concat target "@" (process-name process))
     (concat "*" (process-name process) "*"))))

(defun rcirc-get-buffer (process target &optional server)
  "Return the buffer associated with the PROCESS and TARGET.

If optional argument SERVER is non-nil, return the server buffer
if there is no existing buffer for TARGET, otherwise return nil."
  (with-rcirc-process-buffer process
    (if (null target)
	(current-buffer)
      (let ((buffer (cdr (assoc-string target rcirc-buffer-alist t))))
	(or buffer (when server (current-buffer)))))))

(defun rcirc-get-buffer-create (process target)
  "Return the buffer associated with the PROCESS and TARGET.
Create the buffer if it doesn't exist."
  (let ((buffer (rcirc-get-buffer process target)))
    (if (and buffer (buffer-live-p buffer))
	(with-current-buffer buffer
	  (when (not rcirc-target)
 	    (setq rcirc-target target))
	  buffer)
      ;; create the buffer
      (with-rcirc-process-buffer process
	(let ((new-buffer (get-buffer-create
			   (rcirc-generate-new-buffer-name process target))))
	  (with-current-buffer new-buffer
	    (rcirc-mode process target)
	    (rcirc-put-nick-channel process (rcirc-nick process) target
				    rcirc-current-line))
	  new-buffer)))))

(defun rcirc-send-input ()
  "Send input to target associated with the current buffer."
  (interactive)
  (if (< (point) rcirc-prompt-end-marker)
      ;; copy the line down to the input area
      (progn
	(forward-line 0)
	(let ((start (if (eq (point) (point-min))
			 (point)
		       (if (get-text-property (1- (point)) 'hard)
			   (point)
			 (previous-single-property-change (point) 'hard))))
	      (end (next-single-property-change (1+ (point)) 'hard)))
	  (goto-char (point-max))
	  (insert (replace-regexp-in-string
		   "\n\\s-+" " "
		   (buffer-substring-no-properties start end)))))
    ;; process input
    (goto-char (point-max))
    (when (not (equal 0 (- (point) rcirc-prompt-end-marker)))
      ;; delete a trailing newline
      (when (eq (point) (point-at-bol))
	(delete-char -1))
      (let ((input (buffer-substring-no-properties
		    rcirc-prompt-end-marker (point))))
	(dolist (line (split-string input "\n"))
	  (rcirc-process-input-line line))
	;; add to input-ring
	(save-excursion
	  (ring-insert rcirc-input-ring input)
	  (setq rcirc-input-ring-index 0))))))

(defun rcirc-fill-paragraph (&optional justify)
  (interactive "P")
  (when (> (point) rcirc-prompt-end-marker)
    (save-restriction
      (narrow-to-region rcirc-prompt-end-marker (point-max))
      (let ((fill-column rcirc-max-message-length))
	(fill-region (point-min) (point-max) justify)))))

(defun rcirc-process-input-line (line)
  (if (string-match "^/\\([^ ]+\\) ?\\(.*\\)$" line)
      (rcirc-process-command (match-string 1 line)
			     (match-string 2 line)
			     line)
    (rcirc-process-message line)))

(defun rcirc-process-message (line)
  (if (not rcirc-target)
      (message "Not joined (no target)")
    (delete-region rcirc-prompt-end-marker (point))
    (rcirc-send-message (rcirc-buffer-process) rcirc-target line)
    (setq rcirc-last-post-time (current-time))))

(defun rcirc-process-command (command args line)
  (if (eq (aref command 0) ?/)
      ;; "//text" will send "/text" as a message
      (rcirc-process-message (substring line 1))
    (let ((fun (intern-soft (concat "rcirc-cmd-" command)))
	  (process (rcirc-buffer-process)))
      (newline)
      (with-current-buffer (current-buffer)
	(delete-region rcirc-prompt-end-marker (point))
	(if (string= command "me")
	    (rcirc-print process (rcirc-buffer-nick)
			 "ACTION" rcirc-target args)
	  (rcirc-print process (rcirc-buffer-nick)
		       "COMMAND" rcirc-target line))
	(set-marker rcirc-prompt-end-marker (point))
	(if (fboundp fun)
	    (funcall fun args process rcirc-target)
	  (rcirc-send-string process
			     (concat command " :" args)))))))

(defvar rcirc-parent-buffer nil)
(make-variable-buffer-local 'rcirc-parent-buffer)
(put 'rcirc-parent-buffer 'permanent-local t)
(defvar rcirc-window-configuration nil)
(defun rcirc-edit-multiline ()
  "Move current edit to a dedicated buffer."
  (interactive)
  (let ((pos (1+ (- (point) rcirc-prompt-end-marker))))
    (goto-char (point-max))
    (let ((text (buffer-substring-no-properties rcirc-prompt-end-marker
						(point)))
          (parent (buffer-name)))
      (delete-region rcirc-prompt-end-marker (point))
      (setq rcirc-window-configuration (current-window-configuration))
      (pop-to-buffer (concat "*multiline " parent "*"))
      (funcall rcirc-multiline-major-mode)
      (rcirc-multiline-minor-mode 1)
      (setq rcirc-parent-buffer parent)
      (insert text)
      (and (> pos 0) (goto-char pos))
      (message "Type C-c C-c to return text to %s, or C-c C-k to cancel" parent))))

(defvar rcirc-multiline-minor-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map (kbd "C-c C-c") 'rcirc-multiline-minor-submit)
    (define-key map (kbd "C-x C-s") 'rcirc-multiline-minor-submit)
    (define-key map (kbd "C-c C-k") 'rcirc-multiline-minor-cancel)
    (define-key map (kbd "ESC ESC ESC") 'rcirc-multiline-minor-cancel)
    map)
  "Keymap for multiline mode in rcirc.")

(define-minor-mode rcirc-multiline-minor-mode
  "Minor mode for editing multiple lines in rcirc.
With a prefix argument ARG, enable the mode if ARG is positive,
and disable it otherwise.  If called from Lisp, enable the mode
if ARG is omitted or nil."
  :init-value nil
  :lighter " rcirc-mline"
  :keymap rcirc-multiline-minor-mode-map
  :global nil
  :group 'rcirc
  (setq fill-column rcirc-max-message-length))

(defun rcirc-multiline-minor-submit ()
  "Send the text in buffer back to parent buffer."
  (interactive)
  (untabify (point-min) (point-max))
  (let ((text (buffer-substring (point-min) (point-max)))
        (buffer (current-buffer))
        (pos (point)))
    (set-buffer rcirc-parent-buffer)
    (goto-char (point-max))
    (insert text)
    (kill-buffer buffer)
    (set-window-configuration rcirc-window-configuration)
    (goto-char (+ rcirc-prompt-end-marker (1- pos)))))

(defun rcirc-multiline-minor-cancel ()
  "Cancel the multiline edit."
  (interactive)
  (kill-buffer (current-buffer))
  (set-window-configuration rcirc-window-configuration))

(defun rcirc-any-buffer (process)
  "Return a buffer for PROCESS, either the one selected or the process buffer."
  (if rcirc-always-use-server-buffer-flag
      (process-buffer process)
    (let ((buffer (window-buffer)))
      (if (and buffer
	       (with-current-buffer buffer
		 (and (eq major-mode 'rcirc-mode)
		      (eq (rcirc-buffer-process) process))))
	  buffer
	(process-buffer process)))))

(defcustom rcirc-response-formats
  '(("PRIVMSG" . "<%N> %m")
    ("NOTICE"  . "-%N- %m")
    ("ACTION"  . "[%N %m]")
    ("COMMAND" . "%m")
    ("ERROR"   . "%fw!!! %m")
    (t         . "%fp*** %fs%n %r %m"))
  "An alist of formats used for printing responses.
The format is looked up using the response-type as a key;
if no match is found, the default entry (with a key of t) is used.

The entry's value part should be a string, which is inserted with
the of the following escape sequences replaced by the described values:

  %m        The message text
  %n        The sender's nick
  %N        The sender's nick (with face `rcirc-my-nick' or `rcirc-other-nick')
  %r        The response-type
  %t        The target
  %fw       Following text uses the face `font-lock-warning-face'
  %fp       Following text uses the face `rcirc-server-prefix'
  %fs       Following text uses the face `rcirc-server'
  %f[FACE]  Following text uses the face FACE
  %f-       Following text uses the default face
  %%        A literal `%' character"
  :type '(alist :key-type (choice (string :tag "Type")
				  (const :tag "Default" t))
		:value-type string)
  :group 'rcirc)

(defun rcirc-format-response-string (process sender response target text)
  "Return a nicely-formatted response string, incorporating TEXT
\(and perhaps other arguments).  The specific formatting used
is found by looking up RESPONSE in `rcirc-response-formats'."
  (with-temp-buffer
    (insert (or (cdr (assoc response rcirc-response-formats))
		(cdr (assq t rcirc-response-formats))))
    (goto-char (point-min))
    (let ((start (point-min))
	  (sender (if (or (not sender)
			  (string= (rcirc-server-name process) sender))
		      ""
		    sender))
	  face)
      (while (re-search-forward "%\\(\\(f\\(.\\)\\)\\|\\(.\\)\\)" nil t)
	(rcirc-add-face start (match-beginning 0) face)
	(setq start (match-beginning 0))
	(replace-match
	 (cl-case (aref (match-string 1) 0)
	    (?f (setq face
		      (cl-case (string-to-char (match-string 3))
			(?w 'font-lock-warning-face)
			(?p 'rcirc-server-prefix)
			(?s 'rcirc-server)
			(t nil)))
		"")
	    (?n sender)
	    (?N (let ((my-nick (rcirc-nick process)))
		  (save-match-data
		    (with-syntax-table rcirc-nick-syntax-table
		      (rcirc-facify sender
				    (cond ((string= sender my-nick)
					   'rcirc-my-nick)
					  ((and rcirc-bright-nicks
						(string-match
						 (regexp-opt rcirc-bright-nicks
							     'words)
						 sender))
					   'rcirc-bright-nick)
					  ((and rcirc-dim-nicks
						(string-match
						 (regexp-opt rcirc-dim-nicks
							     'words)
						 sender))
					   'rcirc-dim-nick)
					  (t
					   'rcirc-other-nick)))))))
	    (?m (propertize text 'rcirc-text text))
	    (?r response)
	    (?t (or target ""))
	    (t (concat "UNKNOWN CODE:" (match-string 0))))
	 t t nil 0)
	(rcirc-add-face (match-beginning 0) (match-end 0) face))
      (rcirc-add-face start (match-beginning 0) face))
      (buffer-substring (point-min) (point-max))))

(defun rcirc-target-buffer (process sender response target _text)
  "Return a buffer to print the server response."
  (cl-assert (not (bufferp target)))
  (with-rcirc-process-buffer process
    (cond ((not target)
	   (rcirc-any-buffer process))
	  ((not (rcirc-channel-p target))
	   ;; message from another user
	   (if (or (string= response "PRIVMSG")
		   (string= response "ACTION"))
	       (rcirc-get-buffer-create process (if (string= sender rcirc-nick)
						    target
						  sender))
	     (rcirc-get-buffer process target t)))
	  ((or (rcirc-get-buffer process target)
	       (rcirc-any-buffer process))))))

(defvar rcirc-activity-types nil)
(make-variable-buffer-local 'rcirc-activity-types)
(defvar rcirc-last-sender nil)
(make-variable-buffer-local 'rcirc-last-sender)

(defcustom rcirc-omit-threshold 100
  "Number of lines since last activity from a nick before `rcirc-omit-responses' are omitted."
  :type 'integer
  :group 'rcirc)

(defcustom rcirc-log-process-buffers nil
  "Non-nil if rcirc process buffers should be logged to disk."
  :group 'rcirc
  :type 'boolean
  :version "24.1")

(defun rcirc-last-quit-line (process nick target)
  "Return the line number where NICK left TARGET.
Returns nil if the information is not recorded."
  (let ((chanbuf (rcirc-get-buffer process target)))
    (when chanbuf
      (cdr (assoc-string nick (with-current-buffer chanbuf
				rcirc-recent-quit-alist))))))

(defun rcirc-last-line (process nick target)
  "Return the line from the last activity from NICK in TARGET."
  (let ((line (or (cdr (assoc-string target
				     (gethash nick (with-rcirc-server-buffer
						     rcirc-nick-table)) t))
		  (rcirc-last-quit-line process nick target))))
    (if line
	line
      ;;(message "line is nil for %s in %s" nick target)
      nil)))

(defun rcirc-elapsed-lines (process nick target)
  "Return the number of lines since activity from NICK in TARGET."
  (let ((last-activity-line (rcirc-last-line process nick target)))
    (when (and last-activity-line
	       (> last-activity-line 0))
      (- rcirc-current-line last-activity-line))))

(defvar rcirc-markup-text-functions
  '(rcirc-markup-attributes
    rcirc-markup-my-nick
    rcirc-markup-urls
    rcirc-markup-keywords
    rcirc-markup-bright-nicks)

  "List of functions used to manipulate text before it is printed.

Each function takes two arguments, SENDER, and RESPONSE.  The
buffer is narrowed with the text to be printed and the point is
at the beginning of the `rcirc-text' propertized text.")

(defun rcirc-print (process sender response target text &optional activity)
  "Print TEXT in the buffer associated with TARGET.
Format based on SENDER and RESPONSE.  If ACTIVITY is non-nil,
record activity."
  (or text (setq text ""))
  (unless (and (or (member sender rcirc-ignore-list)
		   (member (with-syntax-table rcirc-nick-syntax-table
			     (when (string-match "^\\([^/]\\w*\\)[:,]" text)
			       (match-string 1 text)))
			   rcirc-ignore-list))
	       ;; do not ignore if we sent the message
 	       (not (string= sender (rcirc-nick process))))
    (let* ((buffer (rcirc-target-buffer process sender response target text))
	   (inhibit-read-only t))
      (with-current-buffer buffer
	(let ((moving (= (point) rcirc-prompt-end-marker))
	      (old-point (point-marker))
	      (fill-start (marker-position rcirc-prompt-start-marker)))

	  (setq text (decode-coding-string text rcirc-decode-coding-system))
	  (unless (string= sender (rcirc-nick process))
	    ;; mark the line with overlay arrow
	    (unless (or (marker-position overlay-arrow-position)
			(get-buffer-window (current-buffer))
			(member response rcirc-omit-responses))
	      (set-marker overlay-arrow-position
			  (marker-position rcirc-prompt-start-marker))))

	  ;; temporarily set the marker insertion-type because
	  ;; insert-before-markers results in hidden text in new buffers
	  (goto-char rcirc-prompt-start-marker)
	  (set-marker-insertion-type rcirc-prompt-start-marker t)
	  (set-marker-insertion-type rcirc-prompt-end-marker t)

	  (let ((start (point)))
	    (insert (rcirc-format-response-string process sender response nil
						  text)
		    (propertize "\n" 'hard t))

 	    ;; squeeze spaces out of text before rcirc-text
	    (fill-region fill-start
			 (1- (or (next-single-property-change fill-start
							      'rcirc-text)
				 rcirc-prompt-end-marker)))

	    ;; run markup functions
 	    (save-excursion
 	      (save-restriction
 		(narrow-to-region start rcirc-prompt-start-marker)
		(goto-char (or (next-single-property-change start 'rcirc-text)
			       (point)))
		(when (rcirc-buffer-process)
		  (save-excursion (rcirc-markup-timestamp sender response))
		  (dolist (fn rcirc-markup-text-functions)
		    (save-excursion (funcall fn sender response)))
		  (when rcirc-fill-flag
		    (save-excursion (rcirc-markup-fill sender response))))

		(when rcirc-read-only-flag
		  (add-text-properties (point-min) (point-max)
				       '(read-only t front-sticky t))))
	      ;; make text omittable
	      (let ((last-activity-lines (rcirc-elapsed-lines process sender target)))
		(if (and (not (string= (rcirc-nick process) sender))
			 (member response rcirc-omit-responses)
			 (or (not last-activity-lines)
			     (< rcirc-omit-threshold last-activity-lines)))
		    (put-text-property (1- start) (1- rcirc-prompt-start-marker)
				       'invisible 'rcirc-omit)
		  ;; otherwise increment the line count
		  (setq rcirc-current-line (1+ rcirc-current-line))))))

	  (set-marker-insertion-type rcirc-prompt-start-marker nil)
	  (set-marker-insertion-type rcirc-prompt-end-marker nil)

	  ;; truncate buffer if it is very long
	  (save-excursion
	    (when (and rcirc-buffer-maximum-lines
		       (> rcirc-buffer-maximum-lines 0)
		       (= (forward-line (- rcirc-buffer-maximum-lines)) 0))
	      (delete-region (point-min) (point))))

	  ;; set the window point for buffers show in windows
	  (walk-windows (lambda (w)
			  (when (and (not (eq (selected-window) w))
				     (eq (current-buffer)
					 (window-buffer w))
				     (>= (window-point w)
					 rcirc-prompt-end-marker))
			      (set-window-point w (point-max))))
			nil t)

	  ;; restore the point
	  (goto-char (if moving rcirc-prompt-end-marker old-point))

	  ;; keep window on bottom line if it was already there
	  (when rcirc-scroll-show-maximum-output
	    (let ((window (get-buffer-window)))
	      (when window
		(with-selected-window window
		  (when (eq major-mode 'rcirc-mode)
		    (when (<= (- (window-height)
				 (count-screen-lines (window-point)
						     (window-start))
				 1)
			      0)
		      (recenter -1)))))))

	  ;; flush undo (can we do something smarter here?)
	  (buffer-disable-undo)
	  (buffer-enable-undo))

	;; record mode line activity
	(when (and activity
		   (not rcirc-ignore-buffer-activity-flag)
		   (not (and rcirc-dim-nicks sender
			     (string-match (regexp-opt rcirc-dim-nicks) sender)
			     (rcirc-channel-p target))))
	      (rcirc-record-activity (current-buffer)
				     (when (not (rcirc-channel-p rcirc-target))
				       'nick)))

	(when (and rcirc-log-flag
		   (or target
		       rcirc-log-process-buffers))
	  (rcirc-log process sender response target text))

	(sit-for 0)			; displayed text before hook
	(run-hook-with-args 'rcirc-print-functions
			    process sender response target text)))))

(defun rcirc-generate-log-filename (process target)
  (if target
      (rcirc-generate-new-buffer-name process target)
    (process-name process)))

(defcustom rcirc-log-filename-function 'rcirc-generate-log-filename
  "A function to generate the filename used by rcirc's logging facility.

It is called with two arguments, PROCESS and TARGET (see
`rcirc-generate-new-buffer-name' for their meaning), and should
return the filename, or nil if no logging is desired for this
session.

If the returned filename is absolute (`file-name-absolute-p'
returns t), then it is used as-is, otherwise the resulting file
is put into `rcirc-log-directory'.

The filename is then cleaned using `convert-standard-filename' to
guarantee valid filenames for the current OS."
  :group 'rcirc
  :type 'function)

(defun rcirc-log (process sender response target text)
  "Record line in `rcirc-log', to be later written to disk."
  (let ((filename (funcall rcirc-log-filename-function process target)))
    (unless (null filename)
      (let ((cell (assoc-string filename rcirc-log-alist))
	    (line (concat (format-time-string rcirc-time-format)
			  (substring-no-properties
			   (rcirc-format-response-string process sender
							 response target text))
			  "\n")))
	(if cell
	    (setcdr cell (concat (cdr cell) line))
	  (setq rcirc-log-alist
		(cons (cons filename line) rcirc-log-alist)))))))

(defun rcirc-log-write ()
  "Flush `rcirc-log-alist' data to disk.

Log data is written to `rcirc-log-directory', except for
log-files with absolute names (see `rcirc-log-filename-function')."
  (dolist (cell rcirc-log-alist)
    (let ((filename (convert-standard-filename
                     (expand-file-name (car cell)
                                       rcirc-log-directory)))
	  (coding-system-for-write 'utf-8))
      (make-directory (file-name-directory filename) t)
      (with-temp-buffer
	(insert (cdr cell))
	(write-region (point-min) (point-max) filename t 'quiet))))
  (setq rcirc-log-alist nil))

(defun rcirc-view-log-file ()
  "View logfile corresponding to the current buffer."
  (interactive)
  (find-file-other-window
   (expand-file-name (funcall rcirc-log-filename-function
			      (rcirc-buffer-process) rcirc-target)
		     rcirc-log-directory)))

(defun rcirc-join-channels (process channels)
  "Join CHANNELS."
  (save-window-excursion
    (dolist (channel channels)
      (with-rcirc-process-buffer process
	(rcirc-cmd-join channel process)))))

;;; nick management
(defvar rcirc-nick-prefix-chars "~&@%+")
(defun rcirc-user-nick (user)
  "Return the nick from USER.  Remove any non-nick junk."
  (save-match-data
    (if (string-match (concat "^[" rcirc-nick-prefix-chars
			      "]?\\([^! ]+\\)!?") (or user ""))
	(match-string 1 user)
      user)))

(defun rcirc-nick-channels (process nick)
  "Return list of channels for NICK."
  (with-rcirc-process-buffer process
    (mapcar (lambda (x) (car x))
	    (gethash nick rcirc-nick-table))))

(defun rcirc-put-nick-channel (process nick channel &optional line)
  "Add CHANNEL to list associated with NICK.
Update the associated linestamp if LINE is non-nil.

If the record doesn't exist, and LINE is nil, set the linestamp
to zero."
  (let ((nick (rcirc-user-nick nick)))
    (with-rcirc-process-buffer process
      (let* ((chans (gethash nick rcirc-nick-table))
	     (record (assoc-string channel chans t)))
	(if record
	    (when line (setcdr record line))
	  (puthash nick (cons (cons channel (or line 0))
			      chans)
		   rcirc-nick-table))))))

(defun rcirc-nick-remove (process nick)
  "Remove NICK from table."
  (with-rcirc-process-buffer process
    (remhash nick rcirc-nick-table)))

(defun rcirc-remove-nick-channel (process nick channel)
  "Remove the CHANNEL from list associated with NICK."
  (with-rcirc-process-buffer process
    (let* ((chans (gethash nick rcirc-nick-table))
           (newchans
	    ;; instead of assoc-string-delete-all:
	    (let ((record (assoc-string channel chans t)))
	      (when record
		(setcar record 'delete)
		(assq-delete-all 'delete chans)))))
      (if newchans
          (puthash nick newchans rcirc-nick-table)
        (remhash nick rcirc-nick-table)))))

(defun rcirc-channel-nicks (process target)
  "Return the list of nicks associated with TARGET sorted by last activity."
  (when target
    (if (rcirc-channel-p target)
	(with-rcirc-process-buffer process
	  (let (nicks)
	    (maphash
	     (lambda (k v)
	       (let ((record (assoc-string target v t)))
		 (if record
		     (setq nicks (cons (cons k (cdr record)) nicks)))))
	     rcirc-nick-table)
	    (mapcar (lambda (x) (car x))
		    (sort nicks (lambda (x y)
				  (let ((lx (or (cdr x) 0))
					(ly (or (cdr y) 0)))
				    (< ly lx)))))))
      (list target))))

(defun rcirc-ignore-update-automatic (nick)
  "Remove NICK from `rcirc-ignore-list'
if NICK is also on `rcirc-ignore-list-automatic'."
  (when (member nick rcirc-ignore-list-automatic)
      (setq rcirc-ignore-list-automatic
	    (delete nick rcirc-ignore-list-automatic)
	    rcirc-ignore-list
	    (delete nick rcirc-ignore-list))))

(defun rcirc-nickname< (s1 s2)
  "Return t if IRC nickname S1 is less than S2, and nil otherwise.
Operator nicknames (@) are considered less than voiced
nicknames (+).  Any other nicknames are greater than voiced
nicknames.  The comparison is case-insensitive."
  (setq s1 (downcase s1)
        s2 (downcase s2))
  (let* ((s1-op (eq ?@ (string-to-char s1)))
         (s2-op (eq ?@ (string-to-char s2))))
    (if s1-op
        (if s2-op
            (string< (substring s1 1) (substring s2 1))
          t)
      (if s2-op
          nil
        (string< s1 s2)))))

(defun rcirc-sort-nicknames-join (input sep)
  "Return a string of sorted nicknames.
INPUT is a string containing nicknames separated by SEP.
This function does not alter the INPUT string."
  (let* ((parts (split-string input sep t))
         (sorted (sort parts 'rcirc-nickname<)))
    (mapconcat 'identity sorted sep)))

;;; activity tracking
(defvar rcirc-track-minor-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map (kbd "C-c C-@") 'rcirc-next-active-buffer)
    (define-key map (kbd "C-c C-SPC") 'rcirc-next-active-buffer)
    map)
  "Keymap for rcirc track minor mode.")

;;;###autoload
(define-minor-mode rcirc-track-minor-mode
  "Global minor mode for tracking activity in rcirc buffers.
With a prefix argument ARG, enable the mode if ARG is positive,
and disable it otherwise.  If called from Lisp, enable the mode
if ARG is omitted or nil."
  :init-value nil
  :lighter ""
  :keymap rcirc-track-minor-mode-map
  :global t
  :group 'rcirc
  (or global-mode-string (setq global-mode-string '("")))
  ;; toggle the mode-line channel indicator
  (if rcirc-track-minor-mode
      (progn
	(and (not (memq 'rcirc-activity-string global-mode-string))
	     (setq global-mode-string
		   (append global-mode-string '(rcirc-activity-string))))
	(add-hook 'window-configuration-change-hook
		  'rcirc-window-configuration-change))
    (setq global-mode-string
	  (delete 'rcirc-activity-string global-mode-string))
    (remove-hook 'window-configuration-change-hook
		 'rcirc-window-configuration-change)))

(or (assq 'rcirc-ignore-buffer-activity-flag minor-mode-alist)
    (setq minor-mode-alist
          (cons '(rcirc-ignore-buffer-activity-flag " Ignore") minor-mode-alist)))
(or (assq 'rcirc-low-priority-flag minor-mode-alist)
    (setq minor-mode-alist
          (cons '(rcirc-low-priority-flag " LowPri") minor-mode-alist)))

(defun rcirc-toggle-ignore-buffer-activity ()
  "Toggle the value of `rcirc-ignore-buffer-activity-flag'."
  (interactive)
  (setq rcirc-ignore-buffer-activity-flag
	(not rcirc-ignore-buffer-activity-flag))
  (message (if rcirc-ignore-buffer-activity-flag
	       "Ignore activity in this buffer"
	     "Notice activity in this buffer"))
  (force-mode-line-update))

(defun rcirc-toggle-low-priority ()
  "Toggle the value of `rcirc-low-priority-flag'."
  (interactive)
  (setq rcirc-low-priority-flag
	(not rcirc-low-priority-flag))
  (message (if rcirc-low-priority-flag
	       "Activity in this buffer is low priority"
	     "Activity in this buffer is normal priority"))
  (force-mode-line-update))

(defun rcirc-switch-to-server-buffer ()
  "Switch to the server buffer associated with current channel buffer."
  (interactive)
  (unless (buffer-live-p rcirc-server-buffer)
    (error "No such buffer"))
  (switch-to-buffer rcirc-server-buffer))

(defun rcirc-jump-to-first-unread-line ()
  "Move the point to the first unread line in this buffer."
  (interactive)
  (if (marker-position overlay-arrow-position)
      (goto-char overlay-arrow-position)
    (message "No unread messages")))

(defun rcirc-bury-buffers ()
  "Bury all RCIRC buffers."
  (interactive)
  (dolist (buf (buffer-list))
    (when (eq 'rcirc-mode (with-current-buffer buf major-mode))
      (bury-buffer buf)         ; buffers not shown
      (quit-windows-on buf))))  ; buffers shown in a window

(defun rcirc-next-active-buffer (arg)
  "Switch to the next rcirc buffer with activity.
With prefix ARG, go to the next low priority buffer with activity."
  (interactive "P")
  (let* ((pair (rcirc-split-activity rcirc-activity))
	 (lopri (car pair))
	 (hipri (cdr pair)))
    (if (or (and (not arg) hipri)
	    (and arg lopri))
	(progn
	  (switch-to-buffer (car (if arg lopri hipri)))
	  (when (> (point) rcirc-prompt-start-marker)
	    (recenter -1)))
      (rcirc-bury-buffers)
      (message "No IRC activity.%s"
               (if lopri
                   (concat
                    "  Type C-u " (key-description (this-command-keys))
                    " for low priority activity.")
                 "")))))

(define-obsolete-variable-alias 'rcirc-activity-hooks
  'rcirc-activity-functions "24.3")
(defvar rcirc-activity-functions nil
  "Hook to be run when there is channel activity.

Functions are called with a single argument, the buffer with the
activity.  Only run if the buffer is not visible and
`rcirc-ignore-buffer-activity-flag' is non-nil.")

(defun rcirc-record-activity (buffer &optional type)
  "Record BUFFER activity with TYPE."
  (with-current-buffer buffer
    (let ((old-activity rcirc-activity)
	  (old-types rcirc-activity-types))
      (when (not (get-buffer-window (current-buffer) t))
	(setq rcirc-activity
	      (sort (if (memq (current-buffer) rcirc-activity) rcirc-activity
                      (cons (current-buffer) rcirc-activity))
		    (lambda (b1 b2)
		      (let ((t1 (with-current-buffer b1 rcirc-last-post-time))
			    (t2 (with-current-buffer b2 rcirc-last-post-time)))
			(time-less-p t2 t1)))))
	(cl-pushnew type rcirc-activity-types)
	(unless (and (equal rcirc-activity old-activity)
		     (member type old-types))
	  (rcirc-update-activity-string)))))
  (run-hook-with-args 'rcirc-activity-functions buffer))

(defun rcirc-clear-activity (buffer)
  "Clear the BUFFER activity."
  (setq rcirc-activity (remove buffer rcirc-activity))
  (with-current-buffer buffer
    (setq rcirc-activity-types nil)))

(defun rcirc-clear-unread (buffer)
  "Erase the last read message arrow from BUFFER."
  (when (buffer-live-p buffer)
    (with-current-buffer buffer
      (set-marker overlay-arrow-position nil))))

(defun rcirc-split-activity (activity)
  "Return a cons cell with ACTIVITY split into (lopri . hipri)."
  (let (lopri hipri)
    (dolist (buf activity)
      (with-current-buffer buf
	(if (and rcirc-low-priority-flag
		 (not (member 'nick rcirc-activity-types)))
	    (push buf lopri)
	  (push buf hipri))))
    (cons (nreverse lopri) (nreverse hipri))))

(defvar rcirc-update-activity-string-hook nil
  "Hook run whenever the activity string is updated.")

;; TODO: add mouse properties
(defun rcirc-update-activity-string ()
  "Update mode-line string."
  (let* ((pair (rcirc-split-activity rcirc-activity))
	 (lopri (car pair))
	 (hipri (cdr pair)))
    (setq rcirc-activity-string
	  (cond ((or hipri lopri)
		 (concat (and hipri "[")
			 (rcirc-activity-string hipri)
			 (and hipri lopri ",")
			 (and lopri
			      (concat "("
				      (rcirc-activity-string lopri)
				      ")"))
			 (and hipri "]")))
		((not (null (rcirc-process-list)))
		 "[]")
		(t "[]")))
    (run-hooks 'rcirc-update-activity-string-hook)))

(defun rcirc-activity-string (buffers)
  (mapconcat (lambda (b)
	       (let ((s (substring-no-properties (rcirc-short-buffer-name b))))
		 (with-current-buffer b
		   (dolist (type rcirc-activity-types)
		     (rcirc-add-face 0 (length s)
				     (cl-case type
				       (nick 'rcirc-track-nick)
				       (keyword 'rcirc-track-keyword))
				     s)))
		 s))
	     buffers ","))

(defun rcirc-short-buffer-name (buffer)
  "Return a short name for BUFFER to use in the mode line indicator."
  (with-current-buffer buffer
    (or rcirc-short-buffer-name (buffer-name))))

(defun rcirc-visible-buffers ()
  "Return a list of the visible buffers that are in rcirc-mode."
  (let (acc)
    (walk-windows (lambda (w)
		    (with-current-buffer (window-buffer w)
		      (when (eq major-mode 'rcirc-mode)
			(push (current-buffer) acc)))))
    acc))

(defvar rcirc-visible-buffers nil)
(defun rcirc-window-configuration-change ()
  (unless (minibuffer-window-active-p (minibuffer-window))
    ;; delay this until command has finished to make sure window is
    ;; actually visible before clearing activity
    (add-hook 'post-command-hook 'rcirc-window-configuration-change-1)))

(defun rcirc-window-configuration-change-1 ()
  ;; clear activity and overlay arrows
  (let* ((old-activity rcirc-activity)
	 (hidden-buffers rcirc-visible-buffers))

    (setq rcirc-visible-buffers (rcirc-visible-buffers))

    (dolist (vbuf rcirc-visible-buffers)
      (setq hidden-buffers (delq vbuf hidden-buffers))
      ;; clear activity for all visible buffers
      (rcirc-clear-activity vbuf))

    ;; clear unread arrow from recently hidden buffers
    (dolist (hbuf hidden-buffers)
      (rcirc-clear-unread hbuf))

    ;; remove any killed buffers from list
    (setq rcirc-activity
	  (delq nil (mapcar (lambda (buf) (when (buffer-live-p buf) buf))
			    rcirc-activity)))
    ;; update the mode-line string
    (unless (equal old-activity rcirc-activity)
      (rcirc-update-activity-string)))

  (remove-hook 'post-command-hook 'rcirc-window-configuration-change-1))


;;; buffer name abbreviation
(defun rcirc-update-short-buffer-names ()
  (let ((bufalist
	 (apply 'append (mapcar (lambda (process)
				  (with-rcirc-process-buffer process
				    rcirc-buffer-alist))
				(rcirc-process-list)))))
    (dolist (i (rcirc-abbreviate bufalist))
      (when (buffer-live-p (cdr i))
	(with-current-buffer (cdr i)
	  (setq rcirc-short-buffer-name (car i)))))))

(defun rcirc-abbreviate (pairs)
  (apply 'append (mapcar 'rcirc-rebuild-tree (rcirc-make-trees pairs))))

(defun rcirc-rebuild-tree (tree &optional acc)
  (let ((ch (char-to-string (car tree))))
    (dolist (x (cdr tree))
      (if (listp x)
	  (setq acc (append acc
			   (mapcar (lambda (y)
				     (cons (concat ch (car y))
					   (cdr y)))
				   (rcirc-rebuild-tree x))))
	(setq acc (cons (cons ch x) acc))))
    acc))

(defun rcirc-make-trees (pairs)
  (let (alist)
    (mapc (lambda (pair)
	    (if (consp pair)
		(let* ((str (car pair))
		       (data (cdr pair))
		       (char (unless (zerop (length str))
			       (aref str 0)))
		       (rest (unless (zerop (length str))
			       (substring str 1)))
		       (part (if char (assq char alist))))
		  (if part
		      ;; existing partition
		      (setcdr part (cons (cons rest data) (cdr part)))
		    ;; new partition
		    (setq alist (cons (if char
					  (list char (cons rest data))
					data)
				      alist))))
	      (setq alist (cons pair alist))))
	  pairs)
    ;; recurse into cdrs of alist
    (mapc (lambda (x)
	    (when (and (listp x) (listp (cadr x)))
	      (setcdr x (if (> (length (cdr x)) 1)
			    (rcirc-make-trees (cdr x))
			  (setcdr x (list (cl-cdadr x)))))))
	  alist)))

;;; /commands these are called with 3 args: PROCESS, TARGET, which is
;; the current buffer/channel/user, and ARGS, which is a string
;; containing the text following the /cmd.

(defmacro defun-rcirc-command (command argument docstring interactive-form
				       &rest body)
  "Define a command."
  `(progn
     (add-to-list 'rcirc-client-commands ,(concat "/" (symbol-name command)))
     (defun ,(intern (concat "rcirc-cmd-" (symbol-name command)))
       (,@argument &optional process target)
       ,(concat docstring "\n\nNote: If PROCESS or TARGET are nil, the values given"
		"\nby `rcirc-buffer-process' and `rcirc-target' will be used.")
       ,interactive-form
       (let ((process (or process (rcirc-buffer-process)))
	     (target (or target rcirc-target)))
         (ignore target)        ; mark `target' variable as ignorable
	 ,@body))))

(defun-rcirc-command msg (message)
  "Send private MESSAGE to TARGET."
  (interactive "i")
  (if (null message)
      (progn
        (setq target (completing-read "Message nick: "
                                      (with-rcirc-server-buffer
					rcirc-nick-table)))
        (when (> (length target) 0)
          (setq message (read-string (format "Message %s: " target)))
          (when (> (length message) 0)
            (rcirc-send-message process target message))))
    (if (not (string-match "\\([^ ]+\\) \\(.+\\)" message))
        (message "Not enough args, or something.")
      (setq target (match-string 1 message)
            message (match-string 2 message))
      (rcirc-send-message process target message))))

(defun-rcirc-command query (nick)
  "Open a private chat buffer to NICK."
  (interactive (list (completing-read "Query nick: "
                                      (with-rcirc-server-buffer rcirc-nick-table))))
  (let ((existing-buffer (rcirc-get-buffer process nick)))
    (switch-to-buffer (or existing-buffer
			  (rcirc-get-buffer-create process nick)))
    (when (not existing-buffer)
      (rcirc-cmd-whois nick))))

(defun-rcirc-command join (channels)
  "Join CHANNELS.
CHANNELS is a comma- or space-separated string of channel names."
  (interactive "sJoin channels: ")
  (let* ((split-channels (split-string channels "[ ,]" t))
         (buffers (mapcar (lambda (ch)
                            (rcirc-get-buffer-create process ch))
                          split-channels))
         (channels (mapconcat 'identity split-channels ",")))
    (rcirc-send-string process (concat "JOIN " channels))
    (when (not (eq (selected-window) (minibuffer-window)))
      (dolist (b buffers) ;; order the new channel buffers in the buffer list
        (switch-to-buffer b)))))

(defun-rcirc-command invite (nick-channel)
  "Invite NICK to CHANNEL."
  (interactive (list
		(concat
		 (completing-read "Invite nick: "
				  (with-rcirc-server-buffer rcirc-nick-table))
		 " "
		 (read-string "Channel: "))))
  (rcirc-send-string process (concat "INVITE " nick-channel)))

;; TODO: /part #channel reason, or consider removing #channel altogether
(defun-rcirc-command part (channel)
  "Part CHANNEL."
  (interactive "sPart channel: ")
  (let ((channel (if (> (length channel) 0) channel target)))
    (rcirc-send-string process (concat "PART " channel " :" rcirc-id-string))))

(defun-rcirc-command quit (reason)
  "Send a quit message to server with REASON."
  (interactive "sQuit reason: ")
  (rcirc-send-string process (concat "QUIT :"
				     (if (not (zerop (length reason)))
					 reason
				       rcirc-id-string))))

(defun-rcirc-command reconnect (_)
  "Reconnect to current server."
  (interactive "i")
  (with-rcirc-server-buffer
    (cond
     (rcirc-connecting (message "Already connecting"))
     ((process-live-p process) (message "Server process is alive"))
     (t (let ((conn-info rcirc-connection-info))
	  (setf (nth 5 conn-info)
		(cl-remove-if-not #'rcirc-channel-p
				  (mapcar #'car rcirc-buffer-alist)))
	  (apply #'rcirc-connect conn-info))))))

(defun-rcirc-command nick (nick)
  "Change nick to NICK."
  (interactive "i")
  (when (null nick)
    (setq nick (read-string "New nick: " (rcirc-nick process))))
  (rcirc-send-string process (concat "NICK " nick)))

(defun-rcirc-command names (channel)
  "Display list of names in CHANNEL or in current channel if CHANNEL is nil.
If called interactively, prompt for a channel when prefix arg is supplied."
  (interactive "P")
  (if (called-interactively-p 'interactive)
      (if channel
          (setq channel (read-string "List names in channel: " target))))
  (let ((channel (if (> (length channel) 0)
                     channel
                   target)))
    (rcirc-send-string process (concat "NAMES " channel))))

(defun-rcirc-command topic (topic)
  "List TOPIC for the TARGET channel.
With a prefix arg, prompt for new topic."
  (interactive "P")
  (if (and (called-interactively-p 'interactive) topic)
      (setq topic (read-string "New Topic: " rcirc-topic)))
  (rcirc-send-string process (concat "TOPIC " target
                                     (when (> (length topic) 0)
                                       (concat " :" topic)))))

(defun-rcirc-command whois (nick)
  "Request information from server about NICK."
  (interactive (list
                (completing-read "Whois: "
                                 (with-rcirc-server-buffer rcirc-nick-table))))
  (rcirc-send-string process (concat "WHOIS " nick)))

(defun-rcirc-command mode (args)
  "Set mode with ARGS."
  (interactive (list (concat (read-string "Mode nick or channel: ")
                             " " (read-string "Mode: "))))
  (rcirc-send-string process (concat "MODE " args)))

(defun-rcirc-command list (channels)
  "Request information on CHANNELS from server."
  (interactive "sList Channels: ")
  (rcirc-send-string process (concat "LIST " channels)))

(defun-rcirc-command oper (args)
  "Send operator command to server."
  (interactive "sOper args: ")
  (rcirc-send-string process (concat "OPER " args)))

(defun-rcirc-command quote (message)
  "Send MESSAGE literally to server."
  (interactive "sServer message: ")
  (rcirc-send-string process message))

(defun-rcirc-command kick (arg)
  "Kick NICK from current channel."
  (interactive (list
                (concat (completing-read "Kick nick: "
                                         (rcirc-channel-nicks
					  (rcirc-buffer-process)
					  rcirc-target))
                        (read-from-minibuffer "Kick reason: "))))
  (let* ((arglist (split-string arg))
         (argstring (concat (car arglist) " :"
                            (mapconcat 'identity (cdr arglist) " "))))
    (rcirc-send-string process (concat "KICK " target " " argstring))))

(defun rcirc-cmd-ctcp (args &optional process _target)
  (if (string-match "^\\([^ ]+\\)\\s-+\\(.+\\)$" args)
      (let* ((target (match-string 1 args))
             (request (upcase (match-string 2 args)))
             (function (intern-soft (concat "rcirc-ctcp-sender-" request))))
        (if (fboundp function) ;; use special function if available
            (funcall function process target request)
          (rcirc-send-ctcp process target request)))
    (rcirc-print process (rcirc-nick process) "ERROR" nil
                 "usage: /ctcp NICK REQUEST")))

(defun rcirc-ctcp-sender-PING (process target _request)
  "Send a CTCP PING message to TARGET."
  (let ((timestamp (format-time-string "%s")))
    (rcirc-send-ctcp process target "PING" timestamp)))

(defun rcirc-cmd-me (args &optional process target)
  (rcirc-send-ctcp process target "ACTION" args))

(defun rcirc-add-or-remove (set &rest elements)
  (dolist (elt elements)
    (if (and elt (not (string= "" elt)))
	(setq set (if (member-ignore-case elt set)
		      (delete elt set)
		    (cons elt set)))))
  set)

(defun-rcirc-command ignore (nick)
  "Manage the ignore list.
Ignore NICK, unignore NICK if already ignored, or list ignored
nicks when no NICK is given.  When listing ignored nicks, the
ones added to the list automatically are marked with an asterisk."
  (interactive "sToggle ignoring of nick: ")
  (setq rcirc-ignore-list
	(apply #'rcirc-add-or-remove rcirc-ignore-list
	       (split-string nick nil t)))
  (rcirc-print process nil "IGNORE" target
	       (mapconcat
		(lambda (nick)
		  (concat nick
			  (if (member nick rcirc-ignore-list-automatic)
			      "*" "")))
		rcirc-ignore-list " ")))

(defun-rcirc-command bright (nick)
  "Manage the bright nick list."
  (interactive "sToggle emphasis of nick: ")
  (setq rcirc-bright-nicks
	(apply #'rcirc-add-or-remove rcirc-bright-nicks
	       (split-string nick nil t)))
  (rcirc-print process nil "BRIGHT" target
	       (mapconcat 'identity rcirc-bright-nicks " ")))

(defun-rcirc-command dim (nick)
  "Manage the dim nick list."
  (interactive "sToggle deemphasis of nick: ")
  (setq rcirc-dim-nicks
	(apply #'rcirc-add-or-remove rcirc-dim-nicks
	       (split-string nick nil t)))
  (rcirc-print process nil "DIM" target
	       (mapconcat 'identity rcirc-dim-nicks " ")))

(defun-rcirc-command keyword (keyword)
  "Manage the keyword list.
Mark KEYWORD, unmark KEYWORD if already marked, or list marked
keywords when no KEYWORD is given."
  (interactive "sToggle highlighting of keyword: ")
  (setq rcirc-keywords
	(apply #'rcirc-add-or-remove rcirc-keywords
	       (split-string keyword nil t)))
  (rcirc-print process nil "KEYWORD" target
	       (mapconcat 'identity rcirc-keywords " ")))


(defun rcirc-add-face (start end name &optional object)
  "Add face NAME to the face text property of the text from START to END."
  (when name
    (let ((pos start)
	  next prop)
      (while (< pos end)
	(setq prop (get-text-property pos 'font-lock-face object)
	      next (next-single-property-change pos 'font-lock-face object end))
	(unless (member name (get-text-property pos 'font-lock-face object))
	  (add-text-properties pos next
			       (list 'font-lock-face (cons name prop)) object))
	(setq pos next)))))

(defun rcirc-facify (string face)
  "Return a copy of STRING with FACE property added."
  (let ((string (or string "")))
    (rcirc-add-face 0 (length string) face string)
    string))

(defvar rcirc-url-regexp
  (concat
   "\\b\\(\\(www\\.\\|\\(s?https?\\|ftp\\|file\\|gopher\\|"
   "nntp\\|news\\|telnet\\|wais\\|mailto\\|info\\):\\)"
   "\\(//[-a-z0-9_.]+:[0-9]*\\)?"
   (if (string-match "[[:digit:]]" "1") ;; Support POSIX?
       (let ((chars "-a-z0-9_=#$@~%&*+\\/[:word:]")
	     (punct "!?:;.,"))
	 (concat
	  "\\(?:"
	  ;; Match paired parentheses, e.g. in Wikipedia URLs:
	  "[" chars punct "]+" "(" "[" chars punct "]+" "[" chars "]*)" "[" chars "]"
	  "\\|"
	  "[" chars punct     "]+" "[" chars "]"
	  "\\)"))
     (concat ;; XEmacs 21.4 doesn't support POSIX.
      "\\([-a-z0-9_=!?#$@~%&*+\\/:;.,]\\|\\w\\)+"
      "\\([-a-z0-9_=#$@~%&*+\\/]\\|\\w\\)"))
   "\\)")
  "Regexp matching URLs.  Set to nil to disable URL features in rcirc.")

;; cf cl-remove-if-not
(defun rcirc-condition-filter (condp lst)
  "Remove all items not satisfying condition CONDP in list LST.
CONDP is a function that takes a list element as argument and returns
non-nil if that element should be included.  Returns a new list."
  (delq nil (mapcar (lambda (x) (and (funcall condp x) x)) lst)))

(defun rcirc-browse-url (&optional arg)
  "Prompt for URL to browse based on URLs in buffer before point.

If ARG is given, opens the URL in a new browser window."
  (interactive "P")
  (let* ((point (point))
         (filtered (rcirc-condition-filter
                    (lambda (x) (>= point (cdr x)))
                    rcirc-urls))
         (completions (mapcar (lambda (x) (car x)) filtered))
         (defaults (mapcar (lambda (x) (car x)) filtered)))
    (browse-url (completing-read "Rcirc browse-url: "
                                 completions nil nil (car defaults) nil defaults)
                arg)))

(defun rcirc-markup-timestamp (_sender _response)
  (goto-char (point-min))
  (insert (rcirc-facify (format-time-string rcirc-time-format
                                            (let ((time rcirc-last-message-time))
                                              (when time (setq rcirc-last-message-time nil))
                                              time))
			'rcirc-timestamp)))

(defun rcirc-markup-attributes (_sender _response)
  (while (re-search-forward "\\([\C-b\C-_\C-v]\\).*?\\(\\1\\|\C-o\\)" nil t)
    (rcirc-add-face (match-beginning 0) (match-end 0)
		    (cl-case (char-after (match-beginning 1))
		      (?\C-b 'bold)
		      (?\C-v 'italic)
		      (?\C-_ 'underline)))
    ;; keep the ^O since it could terminate other attributes
    (when (not (eq ?\C-o (char-before (match-end 2))))
      (delete-region (match-beginning 2) (match-end 2)))
    (delete-region (match-beginning 1) (match-end 1))
    (goto-char (match-beginning 1)))
  ;; remove the ^O characters now
  (goto-char (point-min))
  (while (re-search-forward "\C-o+" nil t)
    (delete-region (match-beginning 0) (match-end 0))))

(defun rcirc-markup-my-nick (_sender response)
  (with-syntax-table rcirc-nick-syntax-table
    (while (re-search-forward (concat "\\b"
				      (regexp-quote (rcirc-nick
						     (rcirc-buffer-process)))
				      "\\b")
			      nil t)
      (rcirc-add-face (match-beginning 0) (match-end 0)
		      'rcirc-nick-in-message)
      (when (string= response "PRIVMSG")
	(rcirc-add-face (point-min) (point-max)
			'rcirc-nick-in-message-full-line)
	(rcirc-record-activity (current-buffer) 'nick)))))

(defun rcirc-markup-urls (_sender _response)
  (while (and rcirc-url-regexp ;; nil means disable URL catching
              (re-search-forward rcirc-url-regexp nil t))
    (let* ((start (match-beginning 0))
           (end (match-end 0))
           (url (match-string-no-properties 0))
           (link-text (buffer-substring-no-properties start end)))
      ;; Add a button for the URL.  Note that we use `make-text-button',
      ;; rather than `make-button', as text-buttons are much faster in
      ;; large buffers.
      (make-text-button start end
			'face 'rcirc-url
			'follow-link t
			'rcirc-url url
			'action (lambda (button)
				  (browse-url (button-get button 'rcirc-url))))
      ;; record the url if it is not already the latest stored url
      (when (not (string= link-text (caar rcirc-urls)))
        (push (cons link-text start) rcirc-urls)))))

(defun rcirc-markup-keywords (sender response)
  (when (and (string= response "PRIVMSG")
	     (not (string= sender (rcirc-nick (rcirc-buffer-process)))))
    (let* ((target (or rcirc-target ""))
	   (keywords (delq nil (mapcar (lambda (keyword)
					 (when (not (string-match keyword
								  target))
					   keyword))
				       rcirc-keywords))))
      (when keywords
	(while (re-search-forward (regexp-opt keywords 'words) nil t)
	  (rcirc-add-face (match-beginning 0) (match-end 0) 'rcirc-keyword)
	  (rcirc-record-activity (current-buffer) 'keyword))))))

(defun rcirc-markup-bright-nicks (_sender response)
  (when (and rcirc-bright-nicks
	     (string= response "NAMES"))
    (with-syntax-table rcirc-nick-syntax-table
      (while (re-search-forward (regexp-opt rcirc-bright-nicks 'words) nil t)
	(rcirc-add-face (match-beginning 0) (match-end 0)
			'rcirc-bright-nick)))))

(defun rcirc-markup-fill (_sender response)
  (when (not (string= response "372")) 	; /motd
    (let ((fill-prefix
	   (or rcirc-fill-prefix
	       (make-string (- (point) (line-beginning-position)) ?\s)))
	  (fill-column (- (cond ((null rcirc-fill-column) fill-column)
                                ((functionp rcirc-fill-column)
				 (funcall rcirc-fill-column))
				(t rcirc-fill-column))
			  ;; make sure ... doesn't cause line wrapping
			  3)))
      (fill-region (point) (point-max) nil t))))

;;; handlers
;; these are called with the server PROCESS, the SENDER, which is a
;; server or a user, depending on the command, the ARGS, which is a
;; list of strings, and the TEXT, which is the original server text,
;; verbatim
(defun rcirc-handler-001 (process sender args text)
  (rcirc-handler-generic process "001" sender args text)
  (with-rcirc-process-buffer process
    (setq rcirc-connecting nil)
    (rcirc-reschedule-timeout process)
    (setq rcirc-server-name sender)
    (setq rcirc-nick (car args))
    (rcirc-update-prompt)
    (if rcirc-auto-authenticate-flag
        (if (and rcirc-authenticate-before-join
		 ;; We have to ensure that there's an authentication
		 ;; entry for that server.  Else,
		 ;; rcirc-authenticated-hook won't be triggered, and
		 ;; autojoin won't happen at all.
		 (let (auth-required)
		   (dolist (s rcirc-authinfo auth-required)
		     (when (string-match (car s) rcirc-server-name)
		       (setq auth-required t)))))
            (progn
	      (add-hook 'rcirc-authenticated-hook 'rcirc-join-channels-post-auth t t)
              (rcirc-authenticate))
          (rcirc-authenticate)
          (rcirc-join-channels process rcirc-startup-channels))
      (rcirc-join-channels process rcirc-startup-channels))))

(defun rcirc-join-channels-post-auth (process)
  "Join `rcirc-startup-channels' after authenticating."
  (with-rcirc-process-buffer process
    (rcirc-join-channels process rcirc-startup-channels)))

(defun rcirc-handler-PRIVMSG (process sender args text)
  (rcirc-check-auth-status process sender args text)
  (let ((target (if (rcirc-channel-p (car args))
                    (car args)
                  sender))
        (message (or (cadr args) "")))
    (if (string-match "^\C-a\\(.*\\)\C-a$" message)
        (rcirc-handler-CTCP process target sender (match-string 1 message))
      (rcirc-print process sender "PRIVMSG" target message t))
    ;; update nick linestamp
    (with-current-buffer (rcirc-get-buffer process target t)
      (rcirc-put-nick-channel process sender target rcirc-current-line))))

(defun rcirc-handler-NOTICE (process sender args text)
  (rcirc-check-auth-status process sender args text)
  (let ((target (car args))
        (message (cadr args)))
    (if (string-match "^\C-a\\(.*\\)\C-a$" message)
        (rcirc-handler-CTCP-response process target sender
				     (match-string 1 message))
      (rcirc-print process sender "NOTICE"
		   (cond ((rcirc-channel-p target)
			  target)
			 ;;; -ChanServ- [#gnu] Welcome...
			 ((string-match "\\[\\(#[^] ]+\\)\\]" message)
			  (match-string 1 message))
			 (sender
			  (if (string= sender (rcirc-server-name process))
			      nil	; server notice
			    sender)))
                 message t))))

(defun rcirc-check-auth-status (process sender args _text)
  "Check if the user just authenticated.
If authenticated, runs `rcirc-authenticated-hook' with PROCESS as
the only argument."
  (with-rcirc-process-buffer process
    (when (and (not rcirc-user-authenticated)
               rcirc-authenticate-before-join
               rcirc-auto-authenticate-flag)
      (let ((target (car args))
            (message (cadr args)))
        (when (or
               (and ;; nickserv
                (string= sender "NickServ")
                (string= target rcirc-nick)
                (member message
                        (list
                         (format "You are now identified for \C-b%s\C-b." rcirc-nick)
			 (format "You are successfully identified as \C-b%s\C-b." rcirc-nick)
                         "Password accepted - you are now recognized."
                         )))
               (and ;; quakenet
                (string= sender "Q")
                (string= target rcirc-nick)
                (string-match "\\`You are now logged in as .+\\.\\'" message)))
          (setq rcirc-user-authenticated t)
          (run-hook-with-args 'rcirc-authenticated-hook process)
          (remove-hook 'rcirc-authenticated-hook 'rcirc-join-channels-post-auth t))))))

(defun rcirc-handler-WALLOPS (process sender args _text)
  (rcirc-print process sender "WALLOPS" sender (car args) t))

(defun rcirc-handler-JOIN (process sender args _text)
  (let ((channel (car args)))
    (with-current-buffer (rcirc-get-buffer-create process channel)
      ;; when recently rejoining, restore the linestamp
      (rcirc-put-nick-channel process sender channel
			      (let ((last-activity-lines
				     (rcirc-elapsed-lines process sender channel)))
				(when (and last-activity-lines
					   (< last-activity-lines rcirc-omit-threshold))
                                  (rcirc-last-line process sender channel))))
      ;; reset mode-line-process in case joining a channel with an
      ;; already open buffer (after getting kicked e.g.)
      (setq mode-line-process nil))

    (rcirc-print process sender "JOIN" channel "")

    ;; print in private chat buffer if it exists
    (when (rcirc-get-buffer (rcirc-buffer-process) sender)
      (rcirc-print process sender "JOIN" sender channel))))

;; PART and KICK are handled the same way
(defun rcirc-handler-PART-or-KICK (process _response channel _sender nick _args)
  (rcirc-ignore-update-automatic nick)
  (if (not (string= nick (rcirc-nick process)))
      ;; this is someone else leaving
      (progn
	(rcirc-maybe-remember-nick-quit process nick channel)
	(rcirc-remove-nick-channel process nick channel))
    ;; this is us leaving
    (mapc (lambda (n)
	    (rcirc-remove-nick-channel process n channel))
	  (rcirc-channel-nicks process channel))

    ;; if the buffer is still around, make it inactive
    (let ((buffer (rcirc-get-buffer process channel)))
      (when buffer
	(rcirc-disconnect-buffer buffer)))))

(defun rcirc-handler-PART (process sender args _text)
  (let* ((channel (car args))
	 (reason (cadr args))
	 (message (concat channel " " reason)))
    (rcirc-print process sender "PART" channel message)
    ;; print in private chat buffer if it exists
    (when (rcirc-get-buffer (rcirc-buffer-process) sender)
      (rcirc-print process sender "PART" sender message))

    (rcirc-handler-PART-or-KICK process "PART" channel sender sender reason)))

(defun rcirc-handler-KICK (process sender args _text)
  (let* ((channel (car args))
	 (nick (cadr args))
	 (reason (nth 2 args))
	 (message (concat nick " " channel " " reason)))
    (rcirc-print process sender "KICK" channel message t)
    ;; print in private chat buffer if it exists
    (when (rcirc-get-buffer (rcirc-buffer-process) nick)
      (rcirc-print process sender "KICK" nick message))

    (rcirc-handler-PART-or-KICK process "KICK" channel sender nick reason)))

(defun rcirc-maybe-remember-nick-quit (process nick channel)
  "Remember NICK as leaving CHANNEL if they recently spoke."
  (let ((elapsed-lines (rcirc-elapsed-lines process nick channel)))
    (when (and elapsed-lines
	       (< elapsed-lines rcirc-omit-threshold))
      (let ((buffer (rcirc-get-buffer process channel)))
	(when buffer
	  (with-current-buffer buffer
	    (let ((record (assoc-string nick rcirc-recent-quit-alist t))
		  (line (rcirc-last-line process nick channel)))
	      (if record
		  (setcdr record line)
		(setq rcirc-recent-quit-alist
		      (cons (cons nick line)
			    rcirc-recent-quit-alist))))))))))

(defun rcirc-handler-QUIT (process sender args _text)
  (rcirc-ignore-update-automatic sender)
  (mapc (lambda (channel)
	  ;; broadcast quit message each channel
	  (rcirc-print process sender "QUIT" channel (apply 'concat args))
	  ;; record nick in quit table if they recently spoke
	  (rcirc-maybe-remember-nick-quit process sender channel))
	(rcirc-nick-channels process sender))
  (rcirc-nick-remove process sender))

(defun rcirc-handler-NICK (process sender args _text)
  (let* ((old-nick sender)
         (new-nick (car args))
         (channels (rcirc-nick-channels process old-nick)))
    ;; update list of ignored nicks
    (rcirc-ignore-update-automatic old-nick)
    (when (member old-nick rcirc-ignore-list)
      (add-to-list 'rcirc-ignore-list new-nick)
      (add-to-list 'rcirc-ignore-list-automatic new-nick))
    ;; print message to nick's channels
    (dolist (target channels)
      (rcirc-print process sender "NICK" target new-nick))
    ;; update private chat buffer, if it exists
    (let ((chat-buffer (rcirc-get-buffer process old-nick)))
      (when chat-buffer
	(with-current-buffer chat-buffer
	  (rcirc-print process sender "NICK" old-nick new-nick)
	  (setq rcirc-target new-nick)
	  (rename-buffer (rcirc-generate-new-buffer-name process new-nick)))))
    ;; remove old nick and add new one
    (with-rcirc-process-buffer process
      (let ((v (gethash old-nick rcirc-nick-table)))
        (remhash old-nick rcirc-nick-table)
        (puthash new-nick v rcirc-nick-table))
      ;; if this is our nick...
      (when (string= old-nick rcirc-nick)
        (setq rcirc-nick new-nick)
	(rcirc-update-prompt t)
        ;; reauthenticate
        (when rcirc-auto-authenticate-flag (rcirc-authenticate))))))

(defun rcirc-handler-PING (process _sender args _text)
  (rcirc-send-string process (concat "PONG :" (car args))))

(defun rcirc-handler-PONG (_process _sender _args _text)
  ;; do nothing
  )

(defun rcirc-handler-TOPIC (process sender args _text)
  (let ((topic (cadr args)))
    (rcirc-print process sender "TOPIC" (car args) topic)
    (with-current-buffer (rcirc-get-buffer process (car args))
      (setq rcirc-topic topic))))

(defvar rcirc-nick-away-alist nil)
(defun rcirc-handler-301 (process _sender args text)
  "RPL_AWAY"
  (let* ((nick (cadr args))
	 (rec (assoc-string nick rcirc-nick-away-alist))
	 (away-message (nth 2 args)))
    (when (or (not rec)
	      (not (string= (cdr rec) away-message)))
      ;; away message has changed
      (rcirc-handler-generic process "AWAY" nick (cdr args) text)
      (if rec
	  (setcdr rec away-message)
	(setq rcirc-nick-away-alist (cons (cons nick away-message)
					  rcirc-nick-away-alist))))))

(defun rcirc-handler-317 (process sender args _text)
  "RPL_WHOISIDLE"
  (let* ((nick (nth 1 args))
         (idle-secs (string-to-number (nth 2 args)))
         (idle-string
          (if (< idle-secs most-positive-fixnum)
              (format-seconds "%yy %dd %hh %mm %z%ss" idle-secs)
            "a very long time"))
         (signon-time (seconds-to-time (string-to-number (nth 3 args))))
         (signon-string (format-time-string "%c" signon-time))
         (message (format "%s idle for %s, signed on %s"
                          nick idle-string signon-string)))
    (rcirc-print process sender "317" nil message t)))

(defun rcirc-handler-332 (process _sender args _text)
  "RPL_TOPIC"
  (let ((buffer (or (rcirc-get-buffer process (cadr args))
		    (rcirc-get-temp-buffer-create process (cadr args)))))
    (with-current-buffer buffer
      (setq rcirc-topic (nth 2 args)))))

(defun rcirc-handler-333 (process sender args _text)
  "333 says who set the topic and when.
Not in rfc1459.txt"
  (let ((buffer (or (rcirc-get-buffer process (cadr args))
		    (rcirc-get-temp-buffer-create process (cadr args)))))
    (with-current-buffer buffer
      (let ((setter (nth 2 args))
	    (time (current-time-string
		   (seconds-to-time
		    (string-to-number (cl-cadddr args))))))
	(rcirc-print process sender "TOPIC" (cadr args)
		     (format "%s (%s on %s)" rcirc-topic setter time))))))

(defun rcirc-handler-477 (process sender args _text)
  "ERR_NOCHANMODES"
  (rcirc-print process sender "477" (cadr args) (nth 2 args)))

(defun rcirc-handler-MODE (process sender args _text)
  (let ((target (car args))
        (msg (mapconcat 'identity (cdr args) " ")))
    (rcirc-print process sender "MODE"
                 (if (string= target (rcirc-nick process))
                     nil
                   target)
                 msg)

    ;; print in private chat buffers if they exist
    (mapc (lambda (nick)
	    (when (rcirc-get-buffer process nick)
	      (rcirc-print process sender "MODE" nick msg)))
	  (cddr args))))

(defun rcirc-get-temp-buffer-create (process channel)
  "Return a buffer based on PROCESS and CHANNEL."
  (let ((tmpnam (concat " " (downcase channel) "TMP" (process-name process))))
    (get-buffer-create tmpnam)))

(defun rcirc-handler-353 (process _sender args _text)
  "RPL_NAMREPLY"
  (let ((channel (nth 2 args))
	(names (or (nth 3 args) "")))
    (mapc (lambda (nick)
            (rcirc-put-nick-channel process nick channel))
          (split-string names " " t))
    ;; create a temporary buffer to insert the names into
    ;; rcirc-handler-366 (RPL_ENDOFNAMES) will handle it
    (with-current-buffer (rcirc-get-temp-buffer-create process channel)
      (goto-char (point-max))
      (insert (car (last args)) " "))))

(defun rcirc-handler-366 (process sender args _text)
  "RPL_ENDOFNAMES"
  (let* ((channel (cadr args))
         (buffer (rcirc-get-temp-buffer-create process channel)))
    (with-current-buffer buffer
      (rcirc-print process sender "NAMES" channel
                   (let ((content (buffer-substring (point-min) (point-max))))
		     (rcirc-sort-nicknames-join content " "))))
    (kill-buffer buffer)))

(defun rcirc-handler-433 (process sender args text)
  "ERR_NICKNAMEINUSE"
  (rcirc-handler-generic process "433" sender args text)
  (let* ((new-nick (concat (cadr args) "`")))
    (with-rcirc-process-buffer process
      (rcirc-cmd-nick new-nick nil process))))

(defun rcirc-authenticate ()
  "Send authentication to process associated with current buffer.
Passwords are stored in `rcirc-authinfo' (which see)."
  (interactive)
  (with-rcirc-server-buffer
    (dolist (i rcirc-authinfo)
      (let ((process (rcirc-buffer-process))
	    (server (car i))
	    (nick (nth 2 i))
	    (method (cadr i))
	    (args (cl-cdddr i)))
	(when (and (string-match server rcirc-server))
          (if (and (memq method '(nickserv chanserv bitlbee))
                   (string-match nick rcirc-nick))
              ;; the following methods rely on the user's nickname.
              (cl-case method
                (nickserv
                 (rcirc-send-privmsg
                  process
                  (or (cadr args) "NickServ")
                  (concat "IDENTIFY " (car args))))
                (chanserv
                 (rcirc-send-privmsg
                  process
                  "ChanServ"
                  (format "IDENTIFY %s %s" (car args) (cadr args))))
                (bitlbee
                 (rcirc-send-privmsg
                  process
                  "&bitlbee"
                  (concat "IDENTIFY " (car args)))))
            ;; quakenet authentication doesn't rely on the user's nickname.
            ;; the variable `nick' here represents the Q account name.
            (when (eq method 'quakenet)
              (rcirc-send-privmsg
               process
               "Q@CServe.quakenet.org"
               (format "AUTH %s %s" nick (car args))))))))))

(defun rcirc-handler-INVITE (process sender args _text)
  (rcirc-print process sender "INVITE" nil (mapconcat 'identity args " ") t))

(defun rcirc-handler-ERROR (process sender args _text)
  (rcirc-print process sender "ERROR" nil (mapconcat 'identity args " ")))

(defun rcirc-handler-CTCP (process target sender text)
  (if (string-match "^\\([^ ]+\\) *\\(.*\\)$" text)
      (let* ((request (upcase (match-string 1 text)))
             (args (match-string 2 text))
             (handler (intern-soft (concat "rcirc-handler-ctcp-" request))))
        (if (not (fboundp handler))
            (rcirc-print process sender "ERROR" target
                         (format "%s sent unsupported ctcp: %s" sender text)
			 t)
          (funcall handler process target sender args)
          (unless (or (string= request "ACTION")
		      (string= request "KEEPALIVE"))
              (rcirc-print process sender "CTCP" target
			   (format "%s" text) t))))))

(defun rcirc-handler-ctcp-VERSION (process _target sender _args)
  (rcirc-send-string process
                     (concat "NOTICE " sender
                             " :\C-aVERSION " rcirc-id-string
                             "\C-a")))

(defun rcirc-handler-ctcp-ACTION (process target sender args)
  (rcirc-print process sender "ACTION" target args t))

(defun rcirc-handler-ctcp-TIME (process _target sender _args)
  (rcirc-send-string process
                     (concat "NOTICE " sender
                             " :\C-aTIME " (current-time-string) "\C-a")))

(defun rcirc-handler-CTCP-response (process _target sender message)
  (rcirc-print process sender "CTCP" nil message t))

(defun rcirc-handler-CAP (process _sender args _text)
  (when (equal (cadr args) "LS")
    (rcirc-send-string process "CAP REQ :server-time"))

  (when (or (equal (cadr args) "ACK")
            (equal (cadr args) "NAK"))
    ;; Capability negotiation is best-effort here, I know that my
    ;; servers support server-time and thus we end negotiation
    ;; immediately.
    (rcirc-send-string process "CAP END")))

(defgroup rcirc-faces nil
  "Faces for rcirc."
  :group 'rcirc
  :group 'faces)

(defface rcirc-my-nick			; font-lock-function-name-face
  '((((class color) (min-colors 88) (background light)) :foreground "Blue1")
    (((class color) (min-colors 88) (background dark))  :foreground "LightSkyBlue")
    (((class color) (min-colors 16) (background light)) :foreground "Blue")
    (((class color) (min-colors 16) (background dark))  :foreground "LightSkyBlue")
    (((class color) (min-colors 8)) :foreground "blue" :weight bold)
    (t :inverse-video t :weight bold))
  "Rcirc face for my messages."
  :group 'rcirc-faces)

(defface rcirc-other-nick	     ; font-lock-variable-name-face
  '((((class grayscale) (background light))
     :foreground "Gray90" :weight bold :slant italic)
    (((class grayscale) (background dark))
     :foreground "DimGray" :weight bold :slant italic)
    (((class color) (min-colors 88) (background light)) :foreground "DarkGoldenrod")
    (((class color) (min-colors 88) (background dark))  :foreground "LightGoldenrod")
    (((class color) (min-colors 16) (background light)) :foreground "DarkGoldenrod")
    (((class color) (min-colors 16) (background dark))  :foreground "LightGoldenrod")
    (((class color) (min-colors 8)) :foreground "yellow" :weight light)
    (t :weight bold :slant italic))
  "Rcirc face for other users' messages."
  :group 'rcirc-faces)

(defface rcirc-bright-nick
  '((((class grayscale) (background light))
     :foreground "LightGray" :weight bold :underline t)
    (((class grayscale) (background dark))
     :foreground "Gray50" :weight bold :underline t)
    (((class color) (min-colors 88) (background light)) :foreground "CadetBlue")
    (((class color) (min-colors 88) (background dark))  :foreground "Aquamarine")
    (((class color) (min-colors 16) (background light)) :foreground "CadetBlue")
    (((class color) (min-colors 16) (background dark))  :foreground "Aquamarine")
    (((class color) (min-colors 8)) :foreground "magenta")
    (t :weight bold :underline t))
  "Rcirc face for nicks matched by `rcirc-bright-nicks'."
  :group 'rcirc-faces)

(defface rcirc-dim-nick
  '((t :inherit default))
  "Rcirc face for nicks in `rcirc-dim-nicks'."
  :group 'rcirc-faces)

(defface rcirc-server			; font-lock-comment-face
  '((((class grayscale) (background light))
     :foreground "DimGray" :weight bold :slant italic)
    (((class grayscale) (background dark))
     :foreground "LightGray" :weight bold :slant italic)
    (((class color) (min-colors 88) (background light))
     :foreground "Firebrick")
    (((class color) (min-colors 88) (background dark))
     :foreground "chocolate1")
    (((class color) (min-colors 16) (background light))
     :foreground "red")
    (((class color) (min-colors 16) (background dark))
     :foreground "red1")
    (((class color) (min-colors 8) (background light)))
    (((class color) (min-colors 8) (background dark)))
    (t :weight bold :slant italic))
  "Rcirc face for server messages."
  :group 'rcirc-faces)

(defface rcirc-server-prefix	 ; font-lock-comment-delimiter-face
  '((default :inherit rcirc-server)
    (((class grayscale)))
    (((class color) (min-colors 16)))
    (((class color) (min-colors 8) (background light))
     :foreground "red")
    (((class color) (min-colors 8) (background dark))
     :foreground "red1"))
  "Rcirc face for server prefixes."
  :group 'rcirc-faces)

(defface rcirc-timestamp
  '((t :inherit default))
  "Rcirc face for timestamps."
  :group 'rcirc-faces)

(defface rcirc-nick-in-message		; font-lock-keyword-face
  '((((class grayscale) (background light)) :foreground "LightGray" :weight bold)
    (((class grayscale) (background dark)) :foreground "DimGray" :weight bold)
    (((class color) (min-colors 88) (background light)) :foreground "Purple")
    (((class color) (min-colors 88) (background dark))  :foreground "Cyan1")
    (((class color) (min-colors 16) (background light)) :foreground "Purple")
    (((class color) (min-colors 16) (background dark))  :foreground "Cyan")
    (((class color) (min-colors 8)) :foreground "cyan" :weight bold)
    (t :weight bold))
  "Rcirc face for instances of your nick within messages."
  :group 'rcirc-faces)

(defface rcirc-nick-in-message-full-line '((t :weight bold))
  "Rcirc face for emphasizing the entire message when your nick is mentioned."
  :group 'rcirc-faces)

(defface rcirc-prompt			; comint-highlight-prompt
  '((((min-colors 88) (background dark)) :foreground "cyan1")
    (((background dark)) :foreground "cyan")
    (t :foreground "dark blue"))
  "Rcirc face for prompts."
  :group 'rcirc-faces)

(defface rcirc-track-nick
  '((((type tty)) :inherit default)
    (t :inverse-video t))
  "Rcirc face used in the mode-line when your nick is mentioned."
  :group 'rcirc-faces)

(defface rcirc-track-keyword '((t :weight bold))
  "Rcirc face used in the mode-line when keywords are mentioned."
  :group 'rcirc-faces)

(defface rcirc-url '((t :weight bold))
  "Rcirc face used to highlight urls."
  :group 'rcirc-faces)

(defface rcirc-keyword '((t :inherit highlight))
  "Rcirc face used to highlight keywords."
  :group 'rcirc-faces)


;; When using M-x flyspell-mode, only check words after the prompt
(put 'rcirc-mode 'flyspell-mode-predicate 'rcirc-looking-at-input)
(defun rcirc-looking-at-input ()
  "Returns true if point is past the input marker."
  (>= (point) rcirc-prompt-end-marker))


(provide 'rcirc)

;;; rcirc.el ends here