summaryrefslogtreecommitdiff
path: root/luaotfload-tool.lua
blob: 4f084ae8ba2b413d8795b49ab28e949f1fce4ec2 (plain)
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
#!/usr/bin/env texlua
-----------------------------------------------------------------------
--         FILE:  luaotfload-tool.lua
--  DESCRIPTION:  database functionality
-- REQUIREMENTS:  luaotfload 2.2
--       AUTHOR:  Khaled Hosny, Élie Roux, Philipp Gesang
--      VERSION:  2.4
--      LICENSE:  GPL v2
--     MODIFIED:  2013-07-28 13:12:04+0200
-----------------------------------------------------------------------

local version = "2.4" --- <int: major>.<int: minor><alpha: fixes>

--[[doc--

This file was originally written (as \fileent{mkluatexfontdb.lua}) by
Elie Roux and Khaled Hosny and, as a derived work of ConTeXt, is
provided under the terms of the GPL v2.0 license as printed in full
text in the manual (luaotfload.pdf).

    \url{http://www.gnu.org/licenses/old-licenses/gpl-2.0.html}.

This file is a wrapper for the luaotfload font names module
(luaotfload-database.lua). It is part of the luaotfload bundle, please
see the luaotfload documentation for more info. Report bugs to

    \url{https://github.com/lualatex/luaotfload/issues}.

--doc]]--

kpse.set_program_name "luatex"

--[[doc--

    We test for Lua 5.1 by means of capability detection to see if
    we’re running an outdated Luatex.  If so, we hand over control to
    the legacy db runner.

    \url{http://lua-users.org/wiki/LuaVersionCompatibility}

--doc]]--


local ioopen          = io.open
local iowrite         = io.write
local kpsefind_file   = kpse.find_file
local next            = next
local osdate          = os.date
local ostype          = os.type
local stringexplode   = string.explode
local stringformat    = string.format
local stringlower     = string.lower
local stringrep       = string.rep
local tableconcat     = table.concat
local texiowrite_nl   = texio.write_nl
local texiowrite      = texio.write
local tonumber        = tonumber
local type            = type

local runtime
if _G.getfenv ~= nil then -- 5.1 or LJ
    if _G.jit ~= nil then
        runtime = { "jit", jit.version }
    else
        runtime = { "stock", _VERSION }
        local oldscript = kpsefind_file "luaotfload-legacy-tool.lua"
        return require (oldscript)
    end
else -- 5.2
    runtime = { "stock", _VERSION }
end


local C, Ct, P, S  = lpeg.C, lpeg.Ct, lpeg.P, lpeg.S
local lpegmatch    = lpeg.match

local loader_file = "luatexbase.loader.lua"
local loader_path = assert(kpsefind_file(loader_file, "lua"),
                           "File '"..loader_file.."' not found")


string.quoted = string.quoted or function (str)
  return string.format("%q",str) 
end

require(loader_path)

--[[doc--
Depending on how the script is called we change its behavior.
For backwards compatibility, moving or symlinking the script to a
file name starting with \fileent{mkluatexfontdb} will cause it to
trigger a database update on every run.
Running as \fileent{luaotfload-tool} -- the new name -- will do this upon
request only.

There are two naming conventions followed here: firstly that of
utilities such as \fileent{mktexpk}, \fileent{mktexlsr} and the likes,
and secondly that of \fileent{fmtutil}.
After support for querying the database was added, the latter appeared
to be the more appropriate.
--doc]]--

config                        = config or { }
local config                  = config
local luaotfloadconfig        = config.luaotfload or { }
config.luaotfload             = luaotfloadconfig
luaotfloadconfig.version      = luaotfloadconfig.version   or version
luaotfloadconfig.names_dir    = luaotfloadconfig.names_dir or "names"
luaotfloadconfig.cache_dir    = luaotfloadconfig.cache_dir or "fonts"
luaotfloadconfig.index_file   = luaotfloadconfig.index_file
                             or "luaotfload-names.lua"
luaotfloadconfig.formats      = luaotfloadconfig.formats
                             or "otf,ttf,ttc,dfont"
luaotfloadconfig.reload       = false
if not luaotfloadconfig.strip then
    luaotfloadconfig.strip = true
end

do -- we don’t have file.basename and the likes yet, so inline parser ftw
    local slash        = P"/"
    local dot          = P"."
    local noslash      = 1 - slash
    local slashes      = slash^1
    local path         =  slashes^-1 * (noslash^1 * slashes)^1
    local thename      = (1 - slash - dot)^1
    local extension    = dot * (1 - slash - dot)^1
    local p_basename   = path^-1 * C(thename) * extension^-1 * P(-1)

    local self = lpegmatch(p_basename, stringlower(arg[0]))
    if self == "luaotfload-tool" then
        luaotfloadconfig.self = "luaotfload-tool"
    else
        luaotfloadconfig.self = "mkluatexfontdb"
    end
end

config.lualibs                  = config.lualibs or { }
config.lualibs.verbose          = false
config.lualibs.prefer_merged    = true
config.lualibs.load_extended    = true

require "lualibs"
local tabletohash               = table.tohash
local stringsplit               = string.split

--[[doc--
\fileent{luatex-basics-gen.lua} calls functions from the
\luafunction{texio.*} library; too much for our taste.
We intercept them with dummies.

Also, it sets up dummies in place of the tables created by the Context
libraries. Since we have loaded the lualibs already this would cause
collateral damage for some libraries whose namespace would be
overridden. We employ our usual backup-restore strategy to work around
this. (Postponing the loading of the lualibs code is not an option
because the functionality is needed by basics-gen itself.)
--doc]]--

local dummy_function = function ( ) end
local backup = {
    write     = texio.write,
    write_nl  = texio.write_nl,
    utilities = utilities,
}

texio.write, texio.write_nl          = dummy_function, dummy_function
require"luaotfload-basics-gen.lua"

texio.write, texio.write_nl          = backup.write, backup.write_nl
utilities                            = backup.utilities

require"luaotfload-override.lua"  --- this populates the logs.* namespace
require"luaotfload-database"
require"alt_getopt"

local names = fonts.names

local status_file                    = "luaotfload-status"
local luaotfloadstatus               = require (status_file)
luaotfloadconfig.status              = luaotfloadstatus

local sanitize_fontname              = names.sanitize_fontname

local pathdata      = names.path
local names_plain   = pathdata.index.lua
local names_bin     = pathdata.index.luc

local help_messages = {
    ["luaotfload-tool"] = [[

Usage: %s [OPTIONS...]

Operations on the LuaTeX font database.

This tool is part of the luaotfload package. Valid options are:

-------------------------------------------------------------------------------
                             VERBOSITY AND LOGGING

  -q --quiet                   don't output anything
  -v --verbose=LEVEL           be more verbose (print the searched directories)
  -vv                          print the loaded fonts
  -vvv                         print all steps of directory searching
  --log=stdout                 redirect log output to stdout

  -V --version                 print version and exit
  -h --help                    print this message
  --diagnose=CHECK             run a self test procedure; one of "files",
                               "environment", "index", "permissions", or
                               "repository"

  --alias=<name>               force behavior of "luaotfload-tool" or legacy
                               "mkluatexfontdb"

-------------------------------------------------------------------------------
                                   DATABASE

  -u --update                  update the database
  -n --no-reload               suppress db update
  --no-strip                   keep redundant information in db
  -f --force                   force re-indexing all fonts
  -c --compress                gzip index file (text version only)
  -l --flush-lookups           empty lookup cache of font requests
  -D --dry-run                 skip loading of fonts, just scan
  --formats=[+|-]EXTENSIONS    set, add, or subtract formats to index
  -p --prefer-texmf            prefer fonts in the TEXMF over system fonts

  --find="font name"           query the database for a font name
  -F --fuzzy                   look for approximate matches if --find fails
  --limit=n                    limit display of fuzzy matches to <n>
                               (default: n = 1)

  -i --info                    display basic font metadata
  -I --inspect                 display detailed font metadata
  -w --warnings                display warnings generated by the
                               fontloader library

  --list=<criterion>           output list of entries by field <criterion>
  --list=<criterion>:<value>   restrict to entries with <criterion>=<value>
  --fields=<f1>,<f2>,…,<fn>    which fields <f> to print with --list
  -b --show-blacklist          show blacklisted files

The font database will be saved to
   %s
   %s

-------------------------------------------------------------------------------
                                   FONT CACHE

  --cache=<directive>          operate on font cache, where <directive> is
                               "show", "purge", or "erase"

The font cache will be written to
   %s

]],
    mkluatexfontdb = [[

Usage: %s [OPTION]...

Rebuild or update the LuaTeX font database.

Valid options:
  -f --force                   force re-indexing all fonts
  -q --quiet                   don't output anything
  -v --verbose=LEVEL           be more verbose (print the searched directories)
  -vv                          print the loaded fonts
  -vvv                         print all steps of directory searching
  -V --version                 print version and exit
  -h --help                    print this message
  --alias=<name>               force behavior of "luaotfload-tool" or legacy
                               "mkluatexfontdb"

The font database will be saved to
   %s
   %s

]],
    short = [[
Usage: luaotfload-tool [--help] [--version] [--verbose=<lvl>]
                       [--update] [--force] [--prefer-texmf]
                       [--dry-run] [--formats=<extension list>]
                       [--find=<font name>] [--fuzzy] [--info] [--inspect]
                       [--list=<criterion>] [--fields=<field list>]
                       [--cache=<directive>] [--flush-lookups]
                       [--show-blacklist] [--diagnose=<procedure>]

Enter 'luaotfload-tool --help' for a larger list of options.
]]
}

local help_msg = function (version)
    local template = help_messages[version]
    iowrite(stringformat(template,
                         luaotfloadconfig.self,
                         names_plain,
                         names_bin,
                         caches.getwritablepath (
                         luaotfloadconfig.cache_dir)))
end

local version_msg = function ( )
    local out = function (...) texiowrite_nl (stringformat (...)) end
    out ("%s version %q", luaotfloadconfig.self, version)
    out ("revision %q", luaotfloadstatus.notes.revision)
    out ("database version %q", names.version)
    out ("Lua interpreter: %s; version %q", runtime[1], runtime[2])
    out ("Luatex SVN revision %d", status.luatex_svn)
    out ("Luatex version %.2f.%d",
         status.luatex_version / 100,
         status.luatex_revision)
    out ""
end


--- makeshift formatting

local head_adornchars = {
    [1] = "*", [2] = "=", [3] = "~", [4] = "-", [5] = "·",
}

local textwidth         = 80
local wd_leftcolumn     = math.floor(textwidth * .25)
local key_fmt           = stringformat([[%%%ds]], wd_leftcolumn)
local val_fmt           = [[%s]]
local fieldseparator    = ":"
local info_fmt          = key_fmt .. fieldseparator .. " " .. val_fmt

local currentdepth      = 0
local counterstack      = { } -- counters per level
local counterformat     = "%d"

local format_counter = function (stack)
    local acc = { }
    for lvl=1, #stack do
        acc[#acc+1] = stringformat(counterformat, stack[lvl])
    end
    return tableconcat(acc, ".")
end

local print_heading = function (title, level)
    local structuredata
    if currentdepth == level then -- top is current
        counterstack[#counterstack] = counterstack[#counterstack] + 1
    elseif currentdepth < level then -- push new
        counterstack[#counterstack+1] = 1
    else -- pop
        local diff = currentdepth - level
        while diff > 0 do
            counterstack[#counterstack] = nil
            diff = diff - 1
        end
        counterstack[#counterstack] = counterstack[#counterstack] + 1
    end
    currentdepth = level

    texiowrite_nl ""
    if not level or level > #head_adornchars then
        level = #head_adornchars
    end
    local adornchar = head_adornchars[level]

    local counter = format_counter(counterstack)

    local s = adornchar .. adornchar .. " "
           .. counter .. " "
           .. title .. " "
    texiowrite_nl (s .. stringrep(adornchar, textwidth-utf.len(s)))
end

local show_info_items = function (fontinfo)
    local items = table.sortedkeys(fontinfo)
    print_heading(fontinfo.fullname, 1)
    texiowrite_nl ""
    for n = 1, #items do
        local item = items[n]
        texiowrite_nl(stringformat(
            info_fmt, item, fontinfo[item]))
    end
    texiowrite_nl ""
end

local p_eol     = S"\n\r"^1
local p_space   = S" \t\v"^0
local p_line    = p_space * C((1 - p_eol)^1)^-1
local p_lines   = Ct(p_line * (p_eol^1 * p_line^-1)^0)

local show_fontloader_warnings = function (ws)
    local nws = #ws
    print_heading(stringformat(
        [[the fontloader emitted %d warnings]],
        nws), 2)
    texiowrite_nl ""
    for i=1, nws do
        local w = ws[i]
        texiowrite_nl (stringformat("%d:", i))
        local lines = lpegmatch(p_lines, w)
        for i=1, #lines do
            local line = lines[i]
            texiowrite_nl("  · " .. line)
        end
        texiowrite_nl ""
    end
end

local p_spacechar  = S" \n\r\t\v"
local p_wordchar   = (1 - p_spacechar)
local p_whitespace = p_spacechar^1
local p_word       = C(p_wordchar^1)
local p_words      = Ct(p_word * (p_whitespace * p_word)^0)

--- string -> int -> string list
local reflow = function (text, width)
    local words
    if type(text) == "string" then
        words = lpegmatch(p_words, text)
        if #words < 2 then
            return { text }
        end
    else
        words = text
        if #words < 2 then
            return words
        end
    end

    local space     = " "
    local utflen    = utf.len
    local reflowed  = { }

    local first     = words[1]
    local linelen   = #first
    local line      = { first }

    for i=2, #words do
        local word  = words[i]
        local lword = utflen(word)
        linelen = linelen + lword + 1
        if linelen > width then
            reflowed[#reflowed+1] = tableconcat(line)
            linelen = #word
            line = { word }
        else
            line[#line+1] = space
            line[#line+1] = word
        end
    end
    reflowed[#reflowed+1] = tableconcat(line)
    return reflowed
end

--- string -> 'a -> string list
local print_field = function (key, val)
    val = tostring(val)
    local lhs    = stringformat(key_fmt, key) .. fieldseparator .. " "
    local wd_lhs = #lhs
    local lines  = reflow(val, textwidth - wd_lhs)

    texiowrite_nl(lhs)
    texiowrite(lines[1])
    if #lines > 1 then
        local indent = stringrep(" ", wd_lhs)
        for i=2, #lines do
            texiowrite_nl(indent)
            texiowrite   (lines[i])
        end
    end
end

local display_names = function (names)
    print_heading("Font Metadata", 2)
    for i=1, #names do
        local lang, namedata = names[i].lang, names[i].names
        print_heading(stringformat("Language: %s ", i, lang), 3)
        texiowrite_nl ""
        if namedata then
            for field, value in next, namedata do
                print_field(field, value)
            end
        end
    end
end

--- see luafflib.c
local general_fields = {
    --- second: l -> literal | n -> length | d -> date
    { "fullname",            "l", "font name"           },
    { "version",             "l", "font version"        },
    { "creationtime",        "d", "creation time"       },
    { "modificationtime",    "d", "modification time"   },
    { "subfonts",            "n", "number of subfonts"  },
    { "glyphcnt",            "l", "number of glyphs"    },
    { "weight",              "l", "weight indicator"    },
    { "design_size",         "l", "design size"         },
    { "design_range_bottom", "l", "design size min"     },
    { "design_range_top",    "l", "design size max"     },
    { "fontstyle_id",        "l", "font style id"       },
    { "fontstyle_name",      "S", "font style name"     },
    { "strokewidth",         "l", "stroke width"        },
    { "units_per_em",        "l", "units per em"        },
    { "ascent",              "l", "ascender height"     },
    { "descent",             "l", "descender height"    },
    { "comments",            "l", "comments"            },
    { "os2_version",         "l", "os2 version"         },
    { "sfd_version",         "l", "sfd version"         },
}

local display_general = function (fullinfo)
    texiowrite_nl ""
    print_heading("General Information", 2)
    texiowrite_nl ""
    for i=1, #general_fields do
        local field = general_fields[i]
        local key, mode, desc  = unpack(field)
        local val
        if mode == "l" then
            val = fullinfo[key]
        elseif mode == "S" then --- style names table
            local data = fullinfo[key]
            if type (data) == "table" then
                if #data > 0 then
                    for n = 1, #data do
                        local nth = data[n]
                        if nth.lang == 1033 then
                            val = nth.name
                            goto found
                        end
                    end
                    val = next (data).name
                else
                    val = ""
                end
                ::found::
            else
                val = data
            end
        elseif mode == "n" then
            local v = fullinfo[key]
            if v then
                val = #fullinfo[key]
            end
        elseif mode == "d" then
            if ostype == "unix" then
                val = osdate("%F %T", fullinfo[key])
            else
                --- the MS compiler doesn’t support C99, so
                --- strftime is missing some functionality;
                --- see loslib.c for details.
                val = osdate("%Y-%m-d %H:%M:%S", fullinfo[key])
            end
        end
        if not val then
            val = "<none>"
        end
        print_field(desc, val)
    end
end

local print_features = function (features)
    for tag, data in next, features do
        print_heading(tag, 4)
        for script, languages in next, data do
            local field     = stringformat(key_fmt, script).. fieldseparator .. " "
            local wd_field  = #field
            local lines     = reflow(languages.list, textwidth - wd_field)
            local indent    = stringrep(" ", wd_field)
            texiowrite_nl(field)
            texiowrite(lines[1])
            if #lines > 1 then
                for i=1, #lines do
                    texiowrite_nl(indent .. lines[i])
                end
            end
        end
    end
end

local extract_feature_info = function (set)
    local collected = { }
    for i=1, #set do
        local features = set[i].features
        if features then
            for j=1, #features do
                local feature   = features[j]
                local scripts   = feature.scripts
                local tagname   = stringlower(feature.tag)
                local entry     = collected[tagname] or { }

                for k=1, #scripts do
                    local script     = scripts[k]
                    local scriptname = stringlower(script.script)
                    local c_script   = entry[scriptname] or {
                                            list = { },
                                            set  = { },
                                        }
                    local list, set  = c_script.list, c_script.set

                    for l=1, #script.langs do
                        local langname = stringlower(script.langs[l])
                        if not set[langname] then
                            list[#list+1] = langname
                            set[langname] = true
                        end
                    end
                    entry[scriptname] = c_script
                end
                collected[tagname]  = entry
            end
        end
    end
    return collected
end

local display_feature_set = function (set)
    local collected = extract_feature_info(set)
    print_features(collected)
end

local display_features = function (gsub, gpos)
    texiowrite_nl ""

    if gsub or gpos then
        print_heading("Features", 2)

        if gsub then
            print_heading("GSUB Features", 3)
            display_feature_set(gsub)
        end

        if gpos then
            print_heading("GPOS Features", 3)
            display_feature_set(gpos)
        end
    end
end

local show_full_info = function (path, subfont, warnings)
    local rawinfo, warn = fontloader.open(path, subfont)
    if warnings then
        show_fontloader_warnings(warn)
    end
    if not rawinfo then
        texiowrite_nl(stringformat([[cannot open font %s]], path))
        return
    end
    local fontdata = { }
    local fullinfo = fontloader.to_table(rawinfo)
    local fields = fontloader.fields(rawinfo)
    fontloader.close(rawinfo)
    display_names(fullinfo.names)
    display_general(fullinfo)
    display_features(fullinfo.gsub, fullinfo.gpos)
end

--- Subfonts returned by fontloader.info() do not correspond
--- to the actual indices required by fontloader.open(), so
--- we try and locate the correct one by matching the request
--- against the full name.

local subfont_by_name
subfont_by_name = function (lst, askedname, n)
    if not n then
        return subfont_by_name (lst, askedname, 1)
    end

    local font = lst[n]
    if font then
        if sanitize_fontname (font.fullname) == askedname then
            return font
        end
        return subfont_by_name (lst, askedname, n+1)
    end
    return false
end

--[[doc--
The font info knows two levels of detail:

    a)  basic information returned by fontloader.info(); and
    b)  detailed information that is a subset of the font table
        returned by fontloader.open().
--doc]]--

local show_font_info = function (basename, askedname, detail, warnings)
    local filenames = names.data().filenames
    local index     = filenames.base[basename]
    local fullname  = filenames.full[index]
    askedname = sanitize_fontname (askedname)
    if not fullname then -- texmf
        fullname = resolvers.findfile(basename)
    end
    if fullname then
        local shortinfo = fontloader.info(fullname)
        local nfonts   = #shortinfo
        if nfonts > 0 then -- true type collection
            local subfont
            if askedname then
                logs.names_report(true, 1, "resolve",
                    [[%s is part of the font collection %s]],
                    askedname, basename)
                subfont = subfont_by_name(shortinfo, askedname)
            end
            if subfont then
                show_info_items(subfont)
                if detail == true then
                    show_full_info(fullname, subfont, warnings)
                end
            else -- list all subfonts
                logs.names_report(true, 1, "resolve",
                    [[%s is a font collection]], basename)
                for subfont = 1, nfonts do
                    logs.names_report(true, 1, "resolve",
                        [[Showing info for font no. %d]], n)
                    show_info_items(shortinfo[subfont])
                    if detail == true then
                        show_full_info(fullname, subfont, warnings)
                    end
                end
            end
        else
            show_info_items(shortinfo)
            if detail == true then
                show_full_info(fullname, subfont, warnings)
            end
        end
    else
        logs.names_report(true, 1, "resolve",
            "Font %s not found", filename)
    end
end

--[[--
Running the scripts triggers one or more actions that have to be
executed in the correct order. To avoid duplication we track them in a
set.
--]]--

local action_sequence = {
    "loglevel",  "help",  "version", "diagnose",
    "blacklist", "cache", "flush",   "generate",
    "list",      "query",
}

local action_pending  = tabletohash(action_sequence, false)

action_pending.loglevel = true  --- always set the loglevel
action_pending.generate = false --- this is the default action

local actions = { } --- (jobspec -> (bool * bool)) list

actions.loglevel = function (job)
    logs.set_loglevel(job.log_level)
    logs.names_report("info", 3, "util",
                      "Setting log level", "%d", job.log_level)
    logs.names_report("log", 2, "util", "Lua=%s", _VERSION)
    return true, true
end

actions.version = function (job)
    version_msg()
    return true, false
end

actions.help = function (job)
    help_msg (job.help_version or "luaotfload-tool")
    return true, false
end

actions.blacklist = function (job)
    names.read_blacklist()
    local n = 0
    for n, entry in next, table.sortedkeys(names.blacklist) do
        texiowrite_nl(stringformat("(%d %s)", n, entry))
    end
    return true, false
end

actions.generate = function (job)
    local fontnames, savedname
    fontnames = names.update(fontnames, job.force_reload, job.dry_run)
    logs.names_report("info", 2, "db",
        "Fonts in the database: %i", #fontnames.mappings)
    if names.data() then
        return true, true
    end
    return false, false
end

actions.flush = function (job)
    local success, lookups = names.flush_lookup_cache()
    if success then
        local success = names.save_lookups()
        if success then
            logs.names_report("info", 2, "cache", "Lookup cache emptied")
            return true, true
        end
    end
    return false, false
end

local cache_directives = {
    ["purge"] = names.purge_cache,
    ["erase"] = names.erase_cache,
    ["show"]  = names.show_cache,
}

actions.cache = function (job)
    local directive = cache_directives[job.cache]
    if not directive or type(directive) ~= "function" then
        logs.names_report("info", 2, "cache",
                          "Invalid font cache directive %s.", job.cache)
        return false, false
    end
    if directive() then
        return true, true
    end
    return false, false
end

actions.query = function (job)

    require "luaotfload-features"

    local query = job.query

    local tmpspec = {
        name          = query,
        lookup        = "name",
        specification = query,
        optsize       = 0,
        features      = { },
    }

    tmpspec = names.handle_request (tmpspec)

    if not tmpspec.size then
        tmpspec.size = 655360 --- assume 10pt
    end

    local foundname, subfont, success

    if tmpspec.lookup == "name"
    or tmpspec.lookup == "anon" --- not *exactly* as resolvers.anon
    then
        foundname, subfont = names.resolve_name (tmpspec)
        if foundname then
            foundname, _, success = names.crude_file_lookup (foundname)
        end
    elseif tmpspec.lookup == "file" then
        foundname, _, success =
            names.crude_file_lookup (tmpspec.name)
    end

    if success then
        logs.names_report(false, 0,
            "resolve", "Font %q found!", query)
        if subfont then
            logs.names_report(false, 0, "resolve",
                "Resolved file name %q, subfont nr. %q",
                foundname, subfont)
        else
            logs.names_report(false, 0, "resolve",
                              "Resolved file name %q", foundname)
        end
        if job.show_info then
            show_font_info (foundname, query, job.full_info, job.warnings)
            texiowrite_nl ""
        end
    else
        logs.names_report(false, 0,
            "resolve", "Cannot find %q in index.", query)
        logs.names_report(false, 0,
            "resolve", "Hint: use the --fuzzy option to display suggestions.", query)
        if job.fuzzy == true then
            logs.names_report(false, 0,
                "resolve", "Looking for close matches, this may take a while ...")
            local _success = names.find_closest(query, job.fuzzy_limit)
        end
    end
    return true, true
end

---         --list=<criterion>
---         --list=<criterion>:<value>
---
---         --list=<criterion>          --fields=<f1>,<f2>,<f3>,...<fn>

local get_fields get_fields = function (entry, fields, acc, n)
    if not acc then
        return get_fields (entry, fields, { }, 1)
    end

    local field = fields [n]
    if field then
        local chain = stringsplit (field, "->")
        local tmp   = entry
        for i = 1, #chain - 1 do
            tmp = tmp [chain [i]]
            if not tmp then
                --- invalid field
                break
            end
        end
        if tmp then
            local value = tmp [chain [#chain]]
            acc[#acc+1] = value or false
        else
            acc[#acc+1] = false
        end
        return get_fields (entry, fields, acc, n+1)
    end
    return acc
end

local separator = "\t" --- could be “,” for csv

local format_fields format_fields = function (fields, acc, n)
    if not acc then
        return format_fields(fields, { }, 1)
    end

    local field = fields[n]
    if field ~= nil then
        if field == false then
            acc[#acc+1] = "<none>"
        else
            acc[#acc+1] = tostring(field)
        end
        return format_fields(fields, acc, n+1)
    end
    return tableconcat(acc, separator)
end

local set_primary_field
set_primary_field = function (fields, addme, acc, n)
    if not acc then
        return set_primary_field(fields, addme, { addme }, 1)
    end

    local field = fields[n]
    if field then
        if field ~= addme then
            acc[#acc+1] = field
        end
        return set_primary_field(fields, addme, acc, n+1)
    end
    return acc
end

local splitcomma = names.patterns.splitcomma

actions.list = function (job)
    local criterion     = job.criterion
    local asked_fields  = job.asked_fields
    local name_index    = names.data ()

    if asked_fields then
        asked_fields = lpegmatch(splitcomma, asked_fields)
    end

    if not asked_fields then
        --- some defaults
        asked_fields = { "plainname", "version", }
    end

    if not name_index then
        name_index = names.load()
    end

    local mappings  = name_index.mappings
    local nmappings = #mappings

    if criterion == "*" then
        logs.names_report(false, 1, "list", "All %d entries", nmappings)
        for i=1, nmappings do
            local entry     = mappings[i]
            local fields    = get_fields(entry, asked_fields)
            --- we could collect these instead ...
            local formatted = format_fields(fields)
            texiowrite_nl(formatted)
        end

    else
        criterion = stringexplode(criterion, ":") --> { field, value }
        local asked_value  = criterion[2]
        criterion          = criterion[1]
        asked_fields       = set_primary_field(asked_fields, criterion)

        logs.names_report(false, 1, "list", "By %s", criterion)

        --- firstly, build a list of fonts to operate on
        local targets = { }
        if asked_value then --- only those whose value matches
            logs.names_report(false, 2, "list", "Restricting to value %s", asked_value)
            for i=1, nmappings do
                local entry = mappings[i]
                if  entry[criterion]
                and tostring(entry[criterion]) == asked_value
                then
                    targets[#targets+1] = entry
                end
            end

        else --- whichever have the field, sorted
            local categories, by_category = { }, { }
            for i=1, nmappings do
                local entry = mappings[i]
                local tmp   = entry
                local chain = stringsplit (criterion, "->")
                for i = 1, #chain - 1 do
                    tmp = tmp [chain [i]]
                    if not tmp then
                        break
                    end
                end
                local value = tmp and tmp [chain [#chain]] or "<none>"
                if value then
                    --value = tostring(value)
                    local entries = by_category[value]
                    if not entries then
                        entries = { entry }
                        categories[#categories+1] = value
                    else
                        entries[#entries+1] = entry
                    end
                    by_category[value] = entries
                end
            end
            table.sort(categories)

            for i=1, #categories do
                local entries = by_category[categories[i]]
                for j=1, #entries do
                    targets[#targets+1] = entries[j]
                end
            end
        end
        local ntargets = #targets
        logs.names_report(false, 2, "list", "%d entries", ntargets)

        --- now, output the collection
        for i=1, ntargets do
            local entry         = targets[i]
            local fields        = get_fields(entry, asked_fields)
            local formatted     = format_fields(fields)
            texiowrite_nl(formatted)
        end
    end

    texiowrite_nl ""

    return true, true
end

actions.diagnose = function (job)
    --- diagnostics are loaded on demand
    local diagnose = require "luaotfload-diagnostics.lua"
    return diagnose (job)
end

--- stuff to be carried out prior to exit

local finalizers = { }

--- returns false if at least one of the actions failed, mainly
--- for closing io channels
local finalize = function ()
    local success = true
    for _, fun in next, finalizers do
        if type (fun) == "function" then
            if fun () == false then success = false end
        end
    end
    return success
end

--[[--
Command-line processing.
mkluatexfontdb.lua relies on the script alt_getopt to process argv and
analyzes its output.

TODO with extended lualibs we have the functionality from the
environment.* namespace that could eliminate the dependency on
alt_getopt.
--]]--

local process_cmdline = function ( ) -- unit -> jobspec
    local result = { -- jobspec
        force_reload = nil,
        full_info    = false,
        warnings     = false,
        criterion    = "",
        query        = "",
        log_level    = 0, --- 2 is approx. the old behavior
    }

    local long_options = {
        alias              = 1,
        cache              = 1,
        compress           = "c",
        diagnose           = 1,
        ["dry-run"]        = "D",
        ["flush-lookups"]  = "l",
        fields             = 1,
        find               = 1,
        force              = "f",
        formats            = 1,
        fuzzy              = "F",
        help               = "h",
        info               = "i",
        inspect            = "I",
        limit              = 1,
        list               = 1,
        log                = 1,
        ["no-reload"]      = "n",
        ["no-strip"]       = 0,
        ["skip-read"]      = "R",
        ["prefer-texmf"]   = "p",
        quiet              = "q",
        ["show-blacklist"] = "b",
        stats              = "S",
        update             = "u",
        verbose            = 1,
        version            = "V",
        warnings           = "w",
    }

    local short_options = "bcDfFiIlnpqRSuvVhw"

    local options, _, optarg =
        alt_getopt.get_ordered_opts (arg, short_options, long_options)

    local nopts = #options
    for n=1, nopts do
        local v = options[n]
        if     v == "q" then
            result.log_level = 0
        elseif v == "u" then
            action_pending["generate"] = true
        elseif v == "v" then
            if result.log_level > 0 then
                result.log_level = result.log_level + 1
            else
                result.log_level = 1
            end
        elseif v == "V" then
            action_pending["version"] = true
        elseif v == "h" then
            action_pending["help"] = true
        elseif v == "f" then
            result.update       = true
            result.force_reload = 1
        elseif v == "verbose" then
            local lvl = optarg[n]
            if lvl then
                lvl = tonumber(lvl)
                result.log_level = lvl
                if lvl > 2 then
                    result.warnings = true
                end
            end
        elseif v == "w" then
            result.warnings = true
        elseif v == "log" then
            local str = optarg[n]
            if str then
                finalizers = logs.set_logout(str, finalizers)
            end
        elseif v == "find" then
            action_pending["query"] = true
            result.query = optarg[n]
        elseif v == "F" then
            result.fuzzy = true
        elseif v == "limit" then
            local lim = optarg[n]
            if lim then
                result.fuzzy_limit = tonumber(lim)
            end
        elseif v == "i" then
            result.show_info = true
        elseif v == "I" then
            result.show_info = true
            result.full_info = true
        elseif v == "alias" then
            luaotfloadconfig.self = optarg[n]
        elseif v == "l" then
            action_pending["flush"] = true
        elseif v == "list" then
            action_pending["list"] = true
            result.criterion = optarg[n]
        elseif v == "fields" then
            result.asked_fields = optarg[n]
        elseif v == "cache" then
            action_pending["cache"] = true
            result.cache = optarg[n]
        elseif v == "D" then
            result.dry_run = true
        elseif v == "p" then  --- TODO adapt to new db structure
            luaotfloadconfig.prioritize = "texmf"
        elseif v == "b" then
            action_pending["blacklist"] = true
        elseif v == "diagnose" then
            action_pending["diagnose"] = true
            result.asked_diagnostics = optarg[n]
        elseif v == "formats" then
            names.set_font_filter (optarg[n])
        elseif v == "n" then
            luaotfloadconfig.update_live = false
        elseif v == "S" then
            luaotfloadconfig.statistics = true
        elseif v == "R" then
            ---  dev only, undocumented
            luaotfloadconfig.skip_read = true
        elseif v == "c" then
            luaotfloadconfig.compress = true
        elseif v == "no-strip" then
            luaotfloadconfig.strip = false
        end
    end

    if luaotfloadconfig.self == "mkluatexfontdb" then --- TODO drop legacy ballast after 2.4
        result.help_version = "mkluatexfontdb"
        action_pending["generate"] = true
        result.log_level = math.max(1, result.log_level)
        logs.set_logout("stdout", finalizers)
    elseif nopts == 0 then
        action_pending["help"] = true
        result.help_version = "short"
    end
    return result
end

local main = function ( ) -- unit -> int
    local retval    = 0
    local job       = process_cmdline()

--    inspect(action_pending)
--    inspect(job)

    for i=1, #action_sequence do
        local actionname = action_sequence[i]
        local exit       = false
        if action_pending[actionname] then
            logs.names_report("log", 3, "util", "Preparing for task",
                              "%s", actionname)

            local action             = actions[actionname]
            local success, continue  = action(job)

            if not success then
                logs.names_report(false, 0, "util",
                    "Could not finish task", "%s", actionname)
                retval = -1
                exit   = true
            elseif not continue then
                logs.names_report(false, 3, "util",
                    "Task completed, exiting", "%s", actionname)
                exit   = true
            else
                logs.names_report(false, 3, "util",
                    "Task completed successfully", "%s", actionname)
            end
        end
        if exit then break end
    end

    if finalize () == false then
        retval = -1
    end

    --texiowrite_nl""
    return retval
end

return main()

-- vim:tw=71:sw=4:ts=4:expandtab