Home

Script: pastebuf.lua

View content of pastebin site in a buffer. (for WeeChat ≥ 0.4.3)
Author: tomoe-mami, version 0.3, WTFPL — added: 2014-01-14, updated: 2014-04-21
   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
--[[
-- pastebuf
--
-- A script for viewing the content of a pastebin inside Weechat buffer.
--
-- Usage:
--    /pastebuf <pastebin-url> [<optional-syntax-language>]
--
-- To use syntax highlighting, set plugins.var.lua.pastebuf.syntax_highlighter to
-- an external command that will highlight the text. If the command contains
-- $lang, it will be replaced by the name of syntax language specified with
-- /pastebuf command. For example, to use pygmentize as syntax highlighter:
--
--     /set plugins.var.lua.pastebuf.syntax_highlighter "pygmentize -l $lang"
--
-- See README in https://github.com/tomoe-mami/weechat-scripts/tree/master/pastebuf
-- for more information.
--
-- Author: tomoe-mami <rumia.youkai.of.dusk@gmail.com>
-- License: WTFPL
-- Requires: Weechat 0.4.3+
-- URL: https://github.com/tomoe-mami/weechat-scripts/tree/master/pastebuf
--
-- History:
--
-- 2014-04-21 Gussi <gussi@gussi.is>
--    v0.3: * Added support for paste.is.
--            It's using sticky notes. API support added.
--
-- 2014-04-04 tomoe-mami <rumia.youkai.of.dusk@gmail.com>
--          * added `run` command inside paste buffer
--          * added option to enable opening url from unsupported service
--          * support url of "hidden paste" from paste.debian.net
--          * added support for paste.ee
--
-- 2014-01-24 tomoe-mami <rumia.youkai.of.dusk@gmail.com>
--    v0.2: * more supported services
--          * fixed csi sgr parsing
--
-- 2014-01-15 tomoe-mami <rumia.youkai.of.dusk@gmail.com>
--    v0.1: * initial release
--
--]]

local w = weechat
local g = {
   script = {
      name = "pastebuf",
      author = "tomoe-mami <rumia.youkai.of.dusk@gmail.com>",
      version = "0.3",
      license = "WTFPL",
      description = "View text from various pastebin sites inside a buffer.",
      url = "https://github.com/tomoe-mami/weechat-scripts/tree/master/pastebuf"
   },
   config = {},
   defaults = {
      fetch_timeout = {
         value = 30000,
         type = "number",
         description = "Timeout for fetching URL (in milliseconds)"
      },
      highlighter_timeout = {
         value = 3000,
         type = "number",
         description = "Timeout for syntax highlighter (in milliseconds)"
      },
      show_line_number = {
         value = true,
         type = "boolean",
         description = "Show line number"
      },
      open_unsupported_url = {
         value = false,
         type = "boolean",
         description = "Force open raw text of unsupported URL format"
      },
      color_line_number = {
         value = "default,darkgray",
         type = "string",
         description = "Color for line number"
      },
      color_line = {
         value = "default,default",
         type = "string",
         description = "Color for line content"
      },
      syntax_highlighter = {
         value = "",
         type = "string",
         description =
            "External command that will be used as syntax highlighter. " ..
            "$lang will be replaced by the name of syntax language"
      },
      shell = {
         value = "/bin/sh",
         type = "string",
         description =
            "Location of your shell or just the shell name if it's already in $PATH"
      },
      sticky_notes_retardness_level = {
         value = 1,
         type = "number",
         description =
            "The retardness level of Sticky Notes API. Use level 0 if they " ..
            "somehow fixed their JSON string. Use level 1 to fix their awful " ..
            "JSON string first before decoding it. Use level 2 if level 1 " ..
            "failed fixing their JSON string. In level 2, we'll abandon their " ..
            "API and just fetch the raw paste. Default is 1."
      }
   },
   sites = {
      __generic__ = {
         pattern = "^([^:/]+://[^/]+)(.*)$",
         id = "%2",
         raw = "%1%2"
      },
      ["bpaste.net"] = {
         pattern = "^([^:/]+://[^/]+)/show/(%w+)",
         id = "%s",
         raw = "%1/raw/%2"
      },
      ["codepad.org"] = {
         pattern = "^([^:/]+://[^/]+)/(%w+)",
         id = "%2",
         raw = "%1/%2/raw.php"
      },
      ["dpaste.com"] = {
         pattern = "^([^:/]+://[^/]+)/(%w+)",
         id = "%2",
         raw = "%1/%2/plain/"
      },
      ["dpaste.de"] = {
         pattern = "^([^:/]+://[^/]+)/(%w+)",
         id = "%2",
         raw = "%1/%2/raw"
      },
      ["fpaste.org"] = {
         pattern = "^([^:/]+://[^/]+)/(%w+/?%w*)",
         id = "%2",
         raw = "%1/%2/raw"
      },
      ["gist.github.com"] = {
         pattern = "^([^:/]+://[^/]+)/([^/]+/[^/]+)",
         id = "%2",
         raw = "https://gist.githubusercontent.com/%2/raw"
      },
      ["ideone.com"] = {
         pattern = "^([^:/]+://[^/]+)/(%w+)",
         id = "%2",
         raw = "%1/plain/%2"
      },
      ["paste.debian.net"] = {
         pattern = "^([^:/]+://[^/]+)/(%w+)",
         id = "%2",
         raw = "%1/plain/%2"
      },
      ["paste.ee"] = {
         pattern = "^([^:/]+://[^/]+)/p/(%w+)",
         id = "%2",
         raw = "%1/r/%2"
      },
      ["pastebin.ca"] = {
         pattern = "^([^:/]+://[^/]+)/(%w+)",
         id = "%2",
         raw = "%1/raw/%2"
      },
      ["pastebin.com"] = {
         pattern = "^([^:/]+://[^/]+)/(%w+)",
         id = "%2",
         raw = "%1/raw.php?i=%2"
      },
      ["pastebin.osuosl.org"] = {
         pattern = "^([^:/]+://[^/]+)/(%w+)",
         id = "%2",
         raw = "%1/%2/raw/"
      },
      ["paste.opensuse.org"] = {
         pattern = "^([^:/]+://[^/]+)/(%w+)",
         id = "%2",
         raw = "%1/view/raw/%2"
      },
      ["pastie.org"] = {},
      ["sprunge.us"] = {
         pattern = "^([^:/]+://[^/]+)/(%w+)",
         id = "%2",
         raw = "%1/%2"
      },
      ["vpaste.net"] = {
         pattern = "^([^:/]+://[^/]+)/(%w+)",
         id = "%2",
         raw = "%1/%2?raw"
      },
      ["paste.is"] = {
         pattern = "^([^:/]+://[^/]+)/(%w+)",
         id = "%2",
         raw = "%1/%2/raw/"
      }
   },
   keys = {
      normal = {
         ["meta2-A"]    = "/window scroll -1",           -- arrow up
         ["meta2-B"]    = "/window scroll 1",            -- arrow down
         ["meta2-C"]    = "/window scroll_horiz 1",      -- arrow right
         ["meta2-D"]    = "/window scroll_horiz -1",     -- arrow left
         ["meta-OA"]    = "/window scroll -10",          -- ctrl+arrow up
         ["meta-OB"]    = "/window scroll 10",           -- ctrl+arrow down
         ["meta-OC"]    = "/window scroll_horiz 10",     -- ctrl+arrow right
         ["meta-OD"]    = "/window scroll_horiz -10",    -- ctrl+arrow left
         ["meta2-1~"]   = "/pastebuf **scroll start",    -- home
         ["meta2-4~"]   = "/pastebuf **scroll end",      -- end
         ["meta-c"]     = "/buffer close",               -- alt+c
      }
   },
   hide_stderr = true,
   buffers = {},
   actions = {},
   langs = {
      -- syntax lang aliases.
      none = false,
      plain = false,
      text = false,
      shell = "sh",
      markdown = false
   },
   sgr = {
      attributes = {
         [1] = "*", -- bold
         [3] = "/", -- italic
         [4] = "_", -- underline
         [7] = "!"  -- inverse
      },
      colors = {
         [ 0] = "black",
         [ 1] = "red",
         [ 2] = "green",
         [ 3] = "yellow",
         [ 4] = "blue",
         [ 5] = "magenta",
         [ 6] = "cyan",
         [ 7] = "gray",

         [ 8] = "darkgray",
         [ 9] = "lightred",
         [10] = "lightgreen",
         [11] = "brown",
         [12] = "lightblue",
         [13] = "lightmagenta",
         [14] = "lightcyan",
         [15] = "white"
      }
   }
}

function prepare_modules(modules)
   local module_exists = function (name)
     if package.loaded[name] then
       return true
     else
       for _, searcher in ipairs(package.searchers or package.loaders) do
         local loader = searcher(name)
         if type(loader) == "function" then
           package.preload[name] = loader
           return true
         end
       end
       return false
     end
   end

   for alias, name in pairs(modules) do
      if module_exists(name) then
         _G[alias] = require(name)
      end
   end
end

function convert_plugin_option_value(opt_type, opt_value)
   if opt_type == "number" or opt_type == "boolean" then
      opt_value = tonumber(opt_value)
      if opt_type == "boolean" then
         opt_value = (opt_value ~= 0)
      end
   end
   return opt_value
end

function load_config()
   local shell = os.getenv("SHELL")
   if shell and shell ~= "" then
      g.defaults.shell.value = shell
   end
   for opt_name, info in pairs(g.defaults) do
      if w.config_is_set_plugin(opt_name) == 0 then
         local val
         if info.type == "boolean" then
            val = info.value and 1 or 0
         elseif info.type == "number" then
            val = info.value or 0
         else
            val = info.value or ""
            if opt_name == "syntax_highlighter" and val == "" then
               val = nil
            end
         end
         w.config_set_plugin(opt_name, val)
         w.config_set_desc_plugin(opt_name, info.description or "")
         g.config[opt_name] = val
      else
         local val = w.config_get_plugin(opt_name)
         g.config[opt_name] = convert_plugin_option_value(info.type, val)
      end
   end
end

function bind_keys(buffer, flag)
   local prefix = flag and "key_bind_" or "key_unbind_"
   for key, command in pairs(g.keys) do
      w.buffer_set(buffer, prefix .. key, flag and command or "")
   end
end

-- crude converter from csi sgr colors to weechat color
function convert_csi_sgr(text)
   local fg, bg, attr = "", "", "|"

   local shift_param = function(s)
      if s then
         local p1, p2, chunk = s:find("^(%d+);?")
         if p1 then
            return chunk, s:sub(p2 + 1)
         end
      end
   end

   local convert_cb = function(code)
      local chunk, code = shift_param(code)
      while chunk do
         chunk = tonumber(chunk)
         if chunk == 0 then
            attr = ""
            local c2 = shift_param(code)
            if not c2 or c2 == "" then
               fg, bg = "", ""
            end
         elseif g.sgr.attributes[chunk] then
            attr = g.sgr.attributes[chunk]
         elseif chunk >= 30 and chunk <= 37 then
            fg = g.sgr.colors[ chunk - 30 ]
         elseif chunk == 38 then
            local c2, c3
            c2, code = shift_param(code)
            fg, c2 = "default", tonumber(c2)
            if c2 == 5 then
               c3, code = shift_param(code)
               if c3 then
                  fg = tonumber(c3)
               end
            end
         elseif chunk == 39 then
            fg = "default"
         elseif chunk >= 40 and chunk <= 47 then
            bg = g.sgr.colors[ chunk - 40 ]
         elseif chunk == 48 then
            local c2, c3
            c2, code = shift_param(code)
            bg, c2 = "default", tonumber(c2)
            if c2 == 5 then
               c3, code = shift_param(code)
               if c3 then
                  bg = tonumber(c3)
               end
            end
         elseif chunk == 49 then
            bg = "default"
         elseif chunk >= 90 and chunk <= 97 then
            fg = g.sgr.colors[ chunk - 82 ]
         elseif chunk >= 100 and chunk <= 107 then
            bg = g.sgr.colors[ chunk - 92 ]
         end
         chunk, code = shift_param(code)
      end
      local result
      if fg == "" and bg == "" and attr == "" then
         result = "reset"
      else
         result = attr .. fg
         if bg and bg ~= "" then
            result = result .. "," .. bg
         end
      end
      return w.color(result)
   end

   return text:gsub("\27%[([%d;]*)m", convert_cb)
end

function message(s)
   w.print("", g.script.name .. "\t" .. s)
end

function get_lang(lang)
   if not lang or lang == "" then
      return false
   end
   lang = lang:lower()
   if g.langs[lang] ~= nil then
      lang = g.langs[lang]
   end
   return lang
end

-- false will delete a localvar. nil (or value not specified) will return
-- the current value. anything else will set the localvar to that value.
function localvar(pointer, variable, value)
   if value == nil then
      return w.buffer_get_string(pointer, "localvar_" .. variable)
   elseif value == false then
      w.buffer_set(pointer, "localvar_del_" .. variable, "")
   else
      if value == true then value = 1 end
      w.buffer_set(pointer, "localvar_set_" .. variable, value)
   end
end

function parse_response_header(response)
   local p, c, m, h, r = response:match("^(%S+) (%d+) (.-)\r\n(.-)\r\n\r\n(.*)$")
   if p then
      c = tonumber(c)
      if c == 301 or c == 302 or c == 303 then
         if r ~= "" then
            -- since we use followlocation=1, there will be another block of header
            -- after the first empty line. parse that one instead.
            return parse_response_header(r)
         end
      end

      local result = {
         protocol = p,
         status_code = c,
         status_message = m
      }

      if h then
         result.headers = {}
         h = h .. "\r\n"
         for name, value in h:gmatch("([^:]+):%s+(.-)\r\n") do
            result.headers[name] = value
         end
      end
      return result
   end
end

function exec_generic_cb(short_name, cmd, status, response, err)
   local buffer = g.buffers[short_name]
   if not buffer then
      return
   end
   if status == 0 or status == w.WEECHAT_HOOK_PROCESS_RUNNING then
      buffer.temp = buffer.temp .. response
      if buffer.callback_partial and type(buffer.callback_partial) == "function" then
         buffer.callback_partial(buffer, short_name, response)
      end
      if status == 0 then
         local data = buffer.temp
         buffer.temp = nil
         if buffer.callback_ok and type(buffer.callback_ok) == "function" then
            buffer.callback_ok(buffer, short_name, data)
         end
      end
   elseif status >= 1 or status == w.WEECHAT_HOOK_PROCESS_ERROR then
      if (cmd:sub(1, 4) ~= "url:" and g.hide_stderr) or not err or err == "" then
         err = "Error when trying to access " .. cmd
      end
      message(string.format("Error %d: %s", status, err))
      if buffer.callback_error and type(buffer.callback_error) == "function" then
         buffer.callback_error(buffer, short_name, status, err)
      end
   end
end

function exec_generic(short_name, cmd, options, callbacks)
   local buffer = g.buffers[short_name]
   buffer.temp = ""
   if callbacks then
      local cb_type = type(callbacks)
      local types = { ok = true, error = true, partial = true, input = true }
      if cb_type == "function" then
         buffer.callback_ok = callbacks
      elseif cb_type == "table" then
         for t, f in pairs(callbacks) do
            if type(f) == "function" and types[t] then
               buffer["callback_" .. t] = f
            end
         end
      end
   end
   if cmd:sub(1,4) == "url:" and options then
      if not options.useragent then
         options.useragent = g.useragent
      end
      if not options.followlocation then
         options.followlocation = 1
      end
   end

   if options then
      buffer.hook = w.hook_process_hashtable(
         cmd,
         options,
         g.config.fetch_timeout,
         "exec_generic_cb",
         short_name)

      if options.stdin and options.stdin == 1 and buffer.callback_input then
         buffer.callback_input(buffer, short_name, buffer.hook)
      end
   else
      buffer.hook = w.hook_process(
         cmd,
         g.config.fetch_timeout,
         "exec_generic_cb",
         short_name)
   end
   return buffer.hook
end

function request_head(short_name, url, options, callbacks)
   if not options then
      options = {}
   end
   options.nobody = 1
   options.header = 1
   exec_generic(short_name, "url:" .. url, options, callbacks)
end

function copy_table(t)
   local r = {}
   for k,v in pairs(t) do
      r[k] = v
   end
   return r
end

function get_site_config(u)
   local host = u:match("^https?://([^/]+)")
   if host then
      if host:match("^www%.") then
         host = host:sub(5)
      end
      local site
      if not g.sites[host] then
         if not g.config.open_unsupported_url then
            return
         else
            site = copy_table(g.sites.__generic__)
         end
      else
         site = copy_table(g.sites[host])
      end

      site.host = host
      site.url = u
      if not site.handler then
         site.id = string.gsub(u, site.pattern, site.id)
         site.raw = string.gsub(u, site.pattern, site.raw)
      end
      return site
   end
end

function init_mode(buf_ptr, mode)
   local prev_mode = localvar(buf_ptr, "mode")
   for key, _ in pairs(g.keys[prev_mode]) do
      w.buffer_set(buf_ptr, "key_unbind_" .. key, "")
   end
   for key, cmd in pairs(g.keys[mode]) do
      w.buffer_set(buf_ptr, "key_bind_" .. key, cmd)
   end
   localvar(buf_ptr, "mode", mode)
end

function action_scroll(buffer, short_name, param)
   if param == "start" then
      w.command(buffer.pointer, "/window scroll_top")
      w.command(buffer.pointer, "/window scroll_horiz -100%")
   elseif param == "end" then
      w.command(buffer.pointer, "/window scroll_bottom")
      w.command(buffer.pointer, "/window scroll_horiz -100%")
   end
end

function action_run(buffer, short_name, param)
   if not g.config.shell or g.config.shell == "" then
      message(
         "Can not run command because the shell is empty. " ..
         "Please specify your shell in plugins.var.lua.pastebuf.shell")
      return
   end
   local cmd, opt = param, param:sub(1, 3)
   local exec_options, exec_cb = {}, { ok = display_colors }
   if opt== "-n " then
      cmd = param:sub(4)
   else
      exec_options.stdin = 1
   end
   if cmd == "" then
      message("Please specify an external command")
      return
   end

   localvar(buffer.pointer, "temp", buffer.temp_name)
   cmd = w.buffer_string_replace_local_var(buffer.pointer, cmd)
   localvar(buffer.pointer, "temp", false)

   if exec_options.stdin then
      exec_cb.input = function (_, _, hook)
         local fp = open_file(buffer.temp_name)
         for line in fp:lines() do
            w.hook_set(hook, "stdin", line .. "\n")
         end
         w.hook_set(hook, "stdin_close", "")
         fp:close()
      end
   end
   exec_generic(
      short_name,
      string.format("%s -c %q", g.config.shell, cmd),
      exec_options,
      exec_cb)
end

function action_save(buffer, short_name, filename)
   if not filename or filename == "" then
      message("You need to specify destination filename after `save`")
   else
      filename = filename:gsub("^~/", os.getenv("HOME") .. "/")
      local output = open_file(filename, "w")
      if output then
         local input = open_file(buffer.temp_name)
         if input then
            local chunk_size, written, chunk = 64 * 1024, 0
            chunk = input:read(chunk_size)
            while chunk do
               output:write(chunk)
               written = written + #chunk
               chunk = input:read(chunk_size)
            end
            input:close()
            message(string.format(
               "%d %s written to %s",
               written,
               (written == 1 and "byte" or "bytes"),
               filename))
         end
         output:close()
      end
   end
end

function action_change_language(buffer, short_name, new_lang)
   if not g.config.syntax_highlighter then
      return
   end

   new_lang = new_lang:match("^%s*(%S+)")
   if not new_lang then
      message("You need to specify the name of syntax language after `lang`")
   else
      local current_lang = localvar(buffer.pointer, "lang") or ""
      new_lang = get_lang(new_lang)
      if current_lang ~= new_lang then
         local fp = open_file(buffer.temp_name)
         if fp then
            buffer.file = fp
            if new_lang then
               localvar(buffer.pointer, "lang", new_lang)
               run_syntax_highlighter(short_name, fp)
            else
               localvar(buffer.pointer, "lang", false)
               display_plain(short_name, fp)
            end
            fp:close()
            buffer.file = nil
         end
      end
   end
end

function action_open_recent_url(current_buffer, limit)
   local list = {}
   limit = tonumber(limit)
   if not limit or limit == 0 then
      limit = 1
   end

   local buf_lines = w.infolist_get("buffer_lines", current_buffer, "")
   if buf_lines and buf_lines ~= "" then

      local url_matcher = "(https?://[%w:!/#_~@&=,;%+%?%[%]%.%%%-]+)"
      local process_line = function ()
         if w.infolist_integer(buf_lines, "displayed") ~= 1 then
            return 0
         end
         local line = w.infolist_string(buf_lines, "message")
         line = w.string_remove_color(line, "")
         local url = line:match(url_matcher)
         if not url then
            return 0
         end
         local site = get_site_config(url)
         if site then
            if site.handler and type(site.handler) == "function" then
               site.handler(site, url)
            else
               handler_normal(site, url)
            end
            return 1
         end
         return 0
      end

      w.infolist_prev(buf_lines)
      local c = process_line()
      while c < limit do
         if w.infolist_prev(buf_lines) ~= 1 then break end
         c = c + process_line()
      end
      w.infolist_free(buf_lines)
      if not c or c == 0 then
         message("No URLs from supported paste services found")
      end
   end
end

function create_buffer(site)
   local short_name
   if site.short_name then
      short_name = site.short_name
   else
      short_name = string.format("%s:%s", site.host, site.id)
   end
   local name = string.format("%s:%s", g.script.name, short_name)
   local buffer = w.buffer_new(name, "buffer_input_cb", "", "buffer_close_cb", "")

   if buffer and buffer ~= "" then
      local default_mode = "normal"
      w.buffer_set(buffer, "type", "free")
      w.buffer_set(buffer, "short_name", short_name)
      w.buffer_set(buffer, "display", "1")
      localvar(buffer, "mode", default_mode)
      init_mode(buffer, default_mode)

      g.buffers[short_name] = { pointer = buffer }
      return g.buffers[short_name], short_name
   end
end

function display_plain(short_name, fp)
   local pointer = g.buffers[short_name].pointer
   local total_lines = 0

   if g.config.show_line_number then
      local lines, total_lines = {}, 0
      for line in fp:lines() do
         total_lines = total_lines + 1
         lines[total_lines] = line
      end

      if total_lines > 0 then
         w.buffer_clear(pointer)
         local num_col_width = #tostring(total_lines)
         local y = 0
         for _, line in ipairs(lines) do
            print_line(pointer, y, num_col_width, line)
            y = y + 1
         end
      end
   else
      for line in fp:lines() do
         print_line(pointer, total_lines, nil, line)
         total_lines = total_lines + 1
      end
   end
end

function display_colors(buffer, short_name, data)
   local y, num_col_width = 0
   data = convert_csi_sgr(data)
   if g.config.show_line_number then
      local _, total_lines = string.gsub(data .. "\n", ".-\n[^\n]*", "")
      num_col_width = #tostring(total_lines)
   end
   w.buffer_clear(buffer.pointer)
   for line in data:gmatch("(.-)\n") do
      print_line(buffer.pointer, y, num_col_width, line)
      y = y + 1
   end
end

function run_syntax_highlighter(short_name, fp)
   local buffer = g.buffers[short_name]
   local cmd = w.buffer_string_replace_local_var(
      buffer.pointer,
      g.config.syntax_highlighter)

   local input_cb = function (_, _, hook)
      for line in fp:lines() do
         w.hook_set(hook, "stdin", line .. "\n")
      end
      w.hook_set(hook, "stdin_close", "")
   end

   exec_generic(
      short_name,
      cmd,
      { stdin = 1 },
      {
         ok = display_colors,
         input = input_cb
      });
end

function open_file(filename, mode)
   local fp = io.open(filename, mode or "r")
   if not fp then
      message(string.format("Unable to open file %s", filename))
   else
      return fp
   end
end

function write_temp(data)
   local temp_name = os.tmpname()
   local fp = open_file(temp_name, "w+")
   if fp then
      fp:write(data)
      fp:seek("set")
      return fp, temp_name
   end
end

function display_paste(short_name)
   local buffer = g.buffers[short_name]
   local fp = open_file(buffer.temp_name)
   if fp then
      buffer.file = fp
      local lang = get_lang(localvar(buffer.pointer, "lang"))
      if g.config.syntax_highlighter and lang then
         run_syntax_highlighter(short_name, fp)
      else
         display_plain(short_name, fp)
      end
      fp:close()
      buffer.file = nil

      localvar(buffer.pointer, "temp", buffer.temp_name)
      w.buffer_set(
         buffer.pointer,
         "title",
         string.format("%s: %s", g.script.name, localvar(buffer.pointer, "url")))
   end
end

function print_line(buffer, y, num_width, content)
   local line = w.color(g.config.color_line) .. " " .. content
   if num_width then
      line = string.format(
         "%s %" .. num_width .. "d %s",
         w.color(g.config.color_line_number),
         y + 1,
         line)
   end
   w.print_y(buffer, y, line)
end

function decode_json_response(s)
   if not s or s == "" then
      message("Error: No response received")
   else
      local decoded = json.decode(s)
      if not decoded or type(decoded) ~= "table" then
         message("Error: Unable to parse server response")
      else
         return decoded
      end
   end
end

function handler_sticky_notes(site, url, lang)
   local id, hash = url:match("^https?://[^/]+/(%w+)/?(%w*)")
   if id then
      site.id = id
      local short_name = string.format("%s:%s", site.host, id)
      if not g.buffers[short_name] then
         g.buffers[short_name] = { host = site.host, url = url }
         local api_url = string.format("http://%s/api/json/%s", site.host, site.id)
         if hash then
            api_url = api_url .. "/" .. hash

            local fix_json = function (json_string)
               return json_string:gsub('"data":%s*"(.-)"', function (s)
                  s = s:gsub("\\", "\\\\")
                  s = s:gsub(
                     "([\t\n\r\b\f])",
                     {
                        ["\t"] = "\\t", ["\n"] = "\\n",
                        ["\r"] = "\\r", ["\b"] = "\\b",
                        ["\f"] = "\\f"
                     })

                  s = s:gsub(
                     "&([^;]+);",
                     { lt = "<", gt = ">", quot = '\\"', amp = "&" })

                  return string.format('"data": "%s"', s)
               end)
            end

            local process_info = function (buffer, short_name, data)
               if g.config.sticky_notes_retardness_level == 1 then
                  data = fix_json(data)
               end
               local info = decode_json_response(data)
               if not info then
                  if g.buffers[short_name] then
                     g.buffers[short_name] = nil
                  end
                  return
               end

               if info.result.error then
                  message(string.format("Error: %s", info.result.error))
               else
                  local param = {
                     short_name = short_name,
                     url = buffer.url,
                     host = buffer.host
                  }
                  local buffer = create_buffer(param)
                  if not buffer then return end

                  localvar(buffer.pointer, "url", param.url)
                  localvar(buffer.pointer, "host", param.host)
                  localvar(buffer.pointer, "id", param.id)

                  w.buffer_set(
                     buffer.pointer,
                     "title",
                     string.format("%s: %s", g.script.name, param.url))

                  local use_highlighter = false
                  if info.result.language and
                     info.result.language ~= json.null and
                     info.result.language ~= "" then
                     local lang = get_lang(info.result.language)
                     if lang then
                        localvar(buffer.pointer, "lang", lang)
                        if g.config.syntax_highlighter then
                           use_highlighter = true
                        end
                     end
                  end

                  buffer.file, buffer.temp_name = write_temp(info.result.data)
                  if buffer.file then
                     if use_highlighter then
                        run_syntax_highlighter(short_name, buffer.file)
                     else
                        display_plain(short_name, buffer.file)
                     end
                     buffer.file:close()
                     buffer.file = nil
                  end
               end
            end

            local on_error = function (buffer, short_name, status, message)
               g.buffers[short_name] = nil
            end

            exec_generic(short_name, "url:" .. api_url, {}, { ok = process_info, error = on_error })
         end
      end
   end
end

function handler_gist(site, url)
   local first, second = url:match("^https://gist%.github%.com/([^/]+)/?([^/]*)")
   local host, gist_id = "gist.github.com"

   if second and second ~= "" then
      gist_id = second
   elseif first then
      gist_id = first
   else
      message("Unrecognized gist url")
      return w.WEECHAT_RC_ERROR
   end

   local short_name = string.format("%s:%s", host, gist_id)
   if not g.buffers[short_name] then
      g.buffers[short_name] = {}
      local api_url = string.format("https://api.github.com/gists/%s", gist_id)

      local display_entry = function (entry)
         local entry_buffer, entry_short_name = create_buffer({
               host = host,
               id = string.format("%s/%s", gist_id, entry.filename)
            })

         if entry_buffer then
            local title = string.format(
               "%s: %s (file: %s)",
               g.script.name,
               url,
               entry.filename)

            if entry.description then
               title = string.format("%s [%s]", title, entry.description)
            end
            w.buffer_set(entry_buffer.pointer, "title", title)

            local use_highlighter = false
            if entry.language and
               entry.language ~= json.null and
               entry.language ~= "" then
               local lang = get_lang(entry.language)
               if lang then
                  localvar(entry_buffer.pointer, "lang", lang)
                  if g.config.syntax_highlighter then
                     use_highlighter = true
                  end
               end
            end

            entry_buffer.parent = short_name
            entry_buffer.file, entry_buffer.temp_name = write_temp(entry.content)
            if entry_buffer.file then
               if use_highlighter then
                  run_syntax_highlighter(entry_short_name, entry_buffer.file)
               else
                  display_plain(entry_short_name, entry_buffer.file)
               end
               entry_buffer.file:close()
               entry_buffer.file = nil
            end
            return entry_buffer, entry_short_name
         end
      end

      local process_info = function (buffer, short_name, data)
         local info = decode_json_response(data)
         if not info then
            if g.buffers[short_name] then
               g.buffers[short_name] = nil
            end
            return
         end

         if info.message then
            message(string.format("Gist error: %s", info.message))
            g.buffers[short_name] = nil
         else

            if info.files and type(info.files) == "table" then
               buffer.sub = {}
               local description
               if info.description and info.description ~= json.null then
                  description = info.description:gsub("[\r\n]+", " ")
               end

               for _, entry in pairs(info.files) do
                  entry.description = description
                  local sub_buffer, sub_short_name = display_entry(entry)
                  if sub_buffer then
                     buffer.sub[sub_short_name] = sub_buffer.pointer
                  end
               end

            end
         end
      end

      local on_error = function (buffer, short_name, status, message)
         g.buffers[short_name] = nil
      end

      exec_generic(short_name, "url:" .. api_url, {}, { ok = process_info, error = on_error })
   else
      message("Gist is already opened. Close all buffers related to this " ..
              "gist first before making another request")
   end
   return w.WEECHAT_RC_OK
end

function detect_lang_from_query(url, host)
   local pattern = "%?(.+)$"
   if host == "sprunge.us" then
      return url:match(pattern)
   elseif host == "vpaste.net" then
      local query = url:match(pattern)
      if not query then return end

      for var, value in query:gmatch("([^=]+)=([^&]+)") do
         if var == "ft" then
            return value
         end
      end
   end
end

function handler_normal(site, url, lang)
   local short_name = string.format("%s:%s", site.host, site.id)
   if g.buffers[short_name] then
      local pointer = g.buffers[short_name].pointer
      if pointer then
         w.buffer_set(pointer, "display", "1")
      end
   else
      local buffer, short_name = create_buffer(site)
      if not buffer.hook then
         --local raw_url = string.format(site.raw, site.id)
         local title = string.format("%s: Fetching %s", g.script.name, site.url)

         w.buffer_set(buffer.pointer, "title", title)

         localvar(buffer.pointer, "url", url)
         localvar(buffer.pointer, "host", site.host)
         localvar(buffer.pointer, "id", site.id)

         if not lang or lang == "" then
            lang = detect_lang_from_query(url, site.host)
         end
         lang = get_lang(lang)
         if lang then
            localvar(buffer.pointer, "lang", lang)
         end

         local receive_paste = function (buffer, short_name, data)
            buffer.hook = nil
            display_paste(short_name)
         end

         local send_request = function (buffer, short_name)
            buffer.temp_name = os.tmpname()
            exec_generic(
               short_name,
               "url:" .. site.raw,
               { file_out = buffer.temp_name },
               receive_paste)
         end

         local prepare_request = function (buffer, short_name, data)
            buffer.hook = nil
            local response = parse_response_header(data)
            if response then
               if response.status_code == 200 then
                  send_request(buffer, short_name)
               else
                  local title = string.format(
                     "%s: %sError %d: %s (URL: %s)",
                     g.script.name,
                     w.color("chat_prefix_error"),
                     response.status_code,
                     response.status_message,
                     site.raw)

                  w.buffer_set(buffer.pointer, "title", title)
                  w.buffer_set(buffer.pointer, "hotlist", w.WEECHAT_HOTLIST_LOW)
               end
            end
         end

         if site.host == "sprunge.us" then
            -- sprunge doesn't allow HEAD method
            send_request(buffer, short_name)
         else
            request_head(short_name, site.raw, nil, prepare_request)
         end
      end
   end
   return w.WEECHAT_RC_OK
end

function handler_pastie(site, url, lang)
   local first, second = url:match("^http://pastie%.org/(%w+)/?(%w*)")
   local pastie_id
   if first == "pastes" and second and second ~= "" then
      pastie_id = second
   else
      pastie_id = first
   end
   site = {
      url = url,
      raw = string.format("http://pastie.org/pastes/%s/download", pastie_id),
      host = "pastie.org",
      id = pastie_id
   }
   return handler_normal(site, url, lang)
end

function handler_debian_paste(site, url, lang)
   local first, second = url:match("^http://paste%.debian%.net/(%w+)/?(%w*)")
   local id, plain
   if first == "hidden" and second and second ~= "" then
      id = second
      plain = "plainh"
   else
      id = first
      plain = "plain"
   end
   site = {
      url = url,
      raw = string.format("http://paste.debian.net/%s/%s", plain, id),
      host = "paste.debian.net",
      id = id
   }
   return handler_normal(site, url, lang)
end

function open_paste(url, lang)
   url = url:gsub("#.*$", "")
   local site = get_site_config(url)
   if not site then
      message("Unsupported site: " .. url)
      return w.WEECHAT_RC_ERROR
   end

   if site.handler and type(site.handler) == "function" then
      return site.handler(site, url, lang)
   else
      return handler_normal(site, url, lang)
   end
end

function run_action(buf_ptr, action, param)
   if not g.actions[action] then
      message(string.format("Unknown action: %s", action))
      return
   end

   if action == "open-recent-url" then
      return g.actions[action](buf_ptr, param)
   else
      local short_name = w.buffer_get_string(buf_ptr, "short_name")
      if not g.buffers[short_name] then
         message("Special commands can only be called inside paste buffer")
         return
      end
      return g.actions[action](g.buffers[short_name], short_name, param)
   end
end

function command_cb(_, current_buffer, param)
   local first, second = param:match("^%s*(%S+)%s*(.*)")
   if not first then
      w.command(current_buffer, "/help " .. g.script.name)
   else
      if first:sub(1, 2) == "**" then
         run_action(current_buffer, first:sub(3), second)
      else
         open_paste(first, second:match("^(%S+)"))
      end
   end
   return w.WEECHAT_RC_OK
end

function config_cb(_, opt_name, opt_value)
   local name = opt_name:match("^plugins%.var%.lua%." .. g.script.name .. "%.(.+)$")
   if name and g.defaults[name] then
      g.config[name] = convert_plugin_option_value(g.defaults[name].type, opt_value)
      if name == "sticky_notes_retardness_level" then
         if g.config[name] < 2 then
            g.sites["fpaste.org"].handler = handler_sticky_notes
            g.sites["pastebin.osuosl.org"].handler = handler_sticky_notes
            g.sites["paste.is"].handler = handler_sticky_notes
         else
            g.sites["fpaste.org"].handler = nil
            g.sites["pastebin.osuosl.org"].handler = nil
            g.sites["paste.is"].handler = nil
         end
      elseif name == "syntax_highlighter" then
         if g.config[name] == "" then
            g.config[name] = nil
         end
      end
   end
end

function buffer_input_cb(_, pointer, input)
   local action, param = input:match("^%s*(%S+)%s*(.*)%s*$")
   if action then
      return run_action(pointer, action, param)
   end
   return w.WEECHAT_RC_OK
end

function buffer_close_cb(_, buffer)
   local short_name = w.buffer_get_string(buffer, "short_name")
   if g.buffers[short_name] then
      local buffer = g.buffers[short_name]
      if buffer.hook and buffer.hook ~= "" then
         w.unhook(buffer.hook)
      end
      if buffer.file and io.type(buffer.file) == "file" then
         buffer.file:close()
      end
      if buffer.temp_name then
         os.remove(buffer.temp_name)
      end
      if buffer.parent and g.buffers[buffer.parent] then
         local p = buffer.parent
         if g.buffers[p].sub and g.buffers[p].sub[short_name] then
            g.buffers[p].sub[short_name] = nil
            local sibling_exists = false
            for _ in pairs(g.buffers[p].sub) do
               sibling_exists = true
               break
            end
            if not sibling_exists then
               g.buffers[p] = nil
            end
         end
      end
      g.buffers[short_name] = nil
   end
end

function buffer_mod_cb(_, buffer, command)
   local short_name = w.buffer_get_string(buffer, "short_name")
   if g.buffers[short_name] then
      message("Please don't modify paste buffer's properties")
      return w.WEECHAT_RC_OK_EAT
   else
      return w.WEECHAT_RC_OK
   end
end

function setup()
   w.register(
      g.script.name,
      g.script.author,
      g.script.version,
      g.script.license,
      g.script.description,
      "", "")

   local weechat_version = tonumber(w.info_get("version_number", "") or 0)
   if weechat_version < 0x00040300 then
      message("This script requires Weechat v0.4.3 or newer")
      return
   end
   if weechat_version >= 0x00040400 then
      g.hide_stderr = false
   end

   prepare_modules({ json = "cjson" })
   load_config()

   if json then
      g.sites["gist.github.com"].handler = handler_gist
      if g.config.sticky_notes_retardness_level < 2 then
         g.sites["fpaste.org"].handler = handler_sticky_notes
         g.sites["pastebin.osuosl.org"].handler = handler_sticky_notes
         g.sites["paste.is"].handler = handler_sticky_notes
      end
   end
   g.sites["pastie.org"].handler = handler_pastie
   g.sites["paste.debian.net"].handler = handler_debian_paste
   g.useragent = string.format(
      "%s v%s (%s)",
      g.script.name,
      g.script.version,
      g.script.url)

   g.actions = {
      lang = action_change_language,
      save = action_save,
      ["open-recent-url"] = action_open_recent_url,
      scroll = action_scroll,
      run = action_run
   }

   local sites = {}
   for name, info in pairs(g.sites) do
      local entry = name
      if name == "gist.github.com" or
         name == "fpaste.org" or
         name == "paste.is" or
         name == "pastebin.osuosl.org" then
         local flag = (info.handler and "with" or "no")
         entry = string.format("%s (%s API)", entry, flag)
      end
      table.insert(sites, entry)
   end

   local supported_sites = ""
   if #sites > 0 then
      supported_sites = "\n\nSupported sites: " .. table.concat(sites, ", ")
   end

   w.hook_config("plugins.var.lua." .. g.script.name .. ".*", "config_cb", "")
   w.hook_command_run("9001|/buffer set *", "buffer_mod_cb", "")

   local bold, nobold = w.color("bold"), w.color("-bold")
   w.hook_command(
      g.script.name,
      "View the content of a paste inside a buffer" .. supported_sites,
      "<paste-url> [<syntax-language>] | **open-recent-url [<n>]",
      string.format([[
paste-url:              URL of the paste
syntax-language:        Optional language for syntax highlighting
%s**open-recent-url%s <n>:  Open <n> recent pastebin URLs that are mentioned
                        inside current buffer. Default value for <n> is 1.


Inside a paste buffer you can use the following commands:

%slang%s <syntax-language>

   Change the active syntax language for current buffer.
   Use %snone%s to set it to plain text.

%ssave%s <filename>

   Save the content of current buffer into a file.

%srun%s [-n] <command>

   Run a shell command and pipe the paste content to it.
   Use %s-n%s if you don't want to pipe the paste.

   Command might use special variable $lang for current syntax language
   and $temp for location of temporary file for current buffer.

   This will not modify the content of a paste, only what is displayed
   on current buffer. Calling %slang%s will display the paste content again.

Keyboard shortcuts for navigating inside paste buffer:

Alt+C                         Close current buffer
Up, Down, Left, Right         Scroll buffer 1 line/char
Ctrl+(Up/Down/Left/Right)     Scroll buffer 10 lines/chars
Home                          Scroll to the start of buffer
End                           Scroll to the end of buffer
]],
      bold, nobold,
      bold, nobold,
      bold, nobold,
      bold, nobold,
      bold, nobold,
      bold, nobold,
      bold, nobold),

      "**open-recent-url",
      "command_cb",
      "")
end

setup()