summaryrefslogtreecommitdiff
path: root/argp/argp-help.c
blob: e18ee418f5b551a7166b6df22bc9b5f41319b12b (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
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
/* Hierarchial argument parsing help output
   Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Written by Miles Bader <miles@gnu.ai.mit.edu>.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

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

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <stdarg.h>
#include <malloc.h>
#include <ctype.h>

#ifndef _
/* This is for other GNU distributions with internationalized messages.
   When compiling libc, the _ macro is predefined.  */
#ifdef HAVE_LIBINTL_H
# include <libintl.h>
# define _(msgid)       gettext (msgid)
#else
# define _(msgid)       (msgid)
# define gettext(msgid) (msgid)
#endif
#endif

#include "argp.h"
#include "argp-fmtstream.h"
#include "argp-namefrob.h"

/* User-selectable (using an environment variable) formatting parameters.

   These may be specified in an environment variable called `ARGP_HELP_FMT',
   with a contents like:  VAR1=VAL1,VAR2=VAL2,BOOLVAR2,no-BOOLVAR2
   Where VALn must be a positive integer.  The list of variables is in the
   UPARAM_NAMES vector, below.  */

/* Default parameters.  */
#define DUP_ARGS      0		/* True if option argument can be duplicated. */
#define DUP_ARGS_NOTE 1		/* True to print a note about duplicate args. */
#define SHORT_OPT_COL 2		/* column in which short options start */
#define LONG_OPT_COL  6		/* column in which long options start */
#define DOC_OPT_COL   2		/* column in which doc options start */
#define OPT_DOC_COL  29		/* column in which option text starts */
#define HEADER_COL    1		/* column in which group headers are printed */
#define USAGE_INDENT 12		/* indentation of wrapped usage lines */
#define RMARGIN      79		/* right margin used for wrapping */

/* User-selectable (using an environment variable) formatting parameters.
   They must all be of type `int' for the parsing code to work.  */
struct uparams
{
  /* If true, arguments for an option are shown with both short and long
     options, even when a given option has both, e.g. `-x ARG, --longx=ARG'.
     If false, then if an option has both, the argument is only shown with
     the long one, e.g., `-x, --longx=ARG', and a message indicating that
     this really means both is printed below the options.  */
  int dup_args;

  /* This is true if when DUP_ARGS is false, and some duplicate arguments have
     been suppressed, an explanatory message should be printed.  */
  int dup_args_note;

  /* Various output columns.  */
  int short_opt_col;
  int long_opt_col;
  int doc_opt_col;
  int opt_doc_col;
  int header_col;
  int usage_indent;
  int rmargin;

  int valid;			/* True when the values in here are valid.  */
};

/* This is a global variable, as user options are only ever read once.  */
static struct uparams uparams = {
  DUP_ARGS, DUP_ARGS_NOTE,
  SHORT_OPT_COL, LONG_OPT_COL, DOC_OPT_COL, OPT_DOC_COL, HEADER_COL,
  USAGE_INDENT, RMARGIN,
  0
};

/* A particular uparam, and what the user name is.  */
struct uparam_name
{
  const char *name;		/* User name.  */
  int is_bool;			/* Whether it's `boolean'.  */
  size_t uparams_offs;		/* Location of the (int) field in UPARAMS.  */
};

/* The name-field mappings we know about.  */
static const struct uparam_name uparam_names[] =
{
  { "dup-args",       1, offsetof (struct uparams, dup_args) },
  { "dup-args-note",  1, offsetof (struct uparams, dup_args_note) },
  { "short-opt-col",  0, offsetof (struct uparams, short_opt_col) },
  { "long-opt-col",   0, offsetof (struct uparams, long_opt_col) },
  { "doc-opt-col",    0, offsetof (struct uparams, doc_opt_col) },
  { "opt-doc-col",    0, offsetof (struct uparams, opt_doc_col) },
  { "header-col",     0, offsetof (struct uparams, header_col) },
  { "usage-indent",   0, offsetof (struct uparams, usage_indent) },
  { "rmargin",        0, offsetof (struct uparams, rmargin) },
  { 0 }
};

/* Read user options from the environment, and fill in UPARAMS appropiately.  */
static void
fill_in_uparams (const struct argp_state *state)
{
  const char *var = getenv ("ARGP_HELP_FMT");

#define SKIPWS(p) do { while (isspace (*p)) p++; } while (0);

  if (var)
    /* Parse var. */
    while (*var)
      {
	SKIPWS (var);

	if (isalpha (*var))
	  {
	    size_t var_len;
	    const struct uparam_name *un;
	    int unspec = 0, val = 0;
	    const char *arg = var;

	    while (isalnum (*arg) || *arg == '-' || *arg == '_')
	      arg++;
	    var_len = arg - var;

	    SKIPWS (arg);

	    if (*arg == '\0' || *arg == ',')
	      unspec = 1;
	    else if (*arg == '=')
	      {
		arg++;
		SKIPWS (arg);
	      }

	    if (unspec)
	      if (var[0] == 'n' && var[1] == 'o' && var[2] == '-')
		{
		  val = 0;
		  var += 3;
		  var_len -= 3;
		}
	      else
		val = 1;
	    else if (isdigit (*arg))
	      {
		val = atoi (arg);
		while (isdigit (*arg))
		  arg++;
		SKIPWS (arg);
	      }

	    for (un = uparam_names; un->name; un++)
	      if (strlen (un->name) == var_len
		  && strncmp (var, un->name, var_len) == 0)
		{
		  if (unspec && !un->is_bool)
		    __argp_failure (state, 0, 0,
			   _("%.*s: ARGP_HELP_FMT parameter requires a value"),
				    (int)var_len, var);
		  else
		    *(int *)((char *)&uparams + un->uparams_offs) = val;
		  break;
		}
	    if (! un->name)
	      __argp_failure (state, 0, 0,
			      _("%.*s: Unknown ARGP_HELP_FMT parameter"),
			      (int)var_len, var);

	    var = arg;
	    if (*var == ',')
	      var++;
	  }
	else if (*var)
	  {
	    __argp_failure (state, 0, 0,
			    _("Garbage in ARGP_HELP_FMT: %s"), var);
	    break;
	  }
      }
}

/* Returns true if OPT hasn't been marked invisible.  Visibility only affects
   whether OPT is displayed or used in sorting, not option shadowing.  */
#define ovisible(opt) (! ((opt)->flags & OPTION_HIDDEN))

/* Returns true if OPT is an alias for an earlier option.  */
#define oalias(opt) ((opt)->flags & OPTION_ALIAS)

/* Returns true if OPT is an documentation-only entry.  */
#define odoc(opt) ((opt)->flags & OPTION_DOC)

/* Returns true if OPT is the end-of-list marker for a list of options.  */
#define oend(opt) __option_is_end (opt)

/* Returns true if OPT has a short option.  */
#define oshort(opt) __option_is_short (opt)

/*
   The help format for a particular option is like:

     -xARG, -yARG, --long1=ARG, --long2=ARG        Documentation...

   Where ARG will be omitted if there's no argument, for this option, or
   will be surrounded by "[" and "]" appropiately if the argument is
   optional.  The documentation string is word-wrapped appropiately, and if
   the list of options is long enough, it will be started on a separate line.
   If there are no short options for a given option, the first long option is
   indented slighly in a way that's supposed to make most long options appear
   to be in a separate column.

   For example, the following output (from ps):

     -p PID, --pid=PID          List the process PID
	 --pgrp=PGRP            List processes in the process group PGRP
     -P, -x, --no-parent        Include processes without parents
     -Q, --all-fields           Don't elide unusable fields (normally if there's
				some reason ps can't print a field for any
				process, it's removed from the output entirely)
     -r, --reverse, --gratuitously-long-reverse-option
				Reverse the order of any sort
	 --session[=SID]        Add the processes from the session SID (which
				defaults to the sid of the current process)

    Here are some more options:
     -f ZOT, --foonly=ZOT       Glork a foonly
     -z, --zaza                 Snit a zar

     -?, --help                 Give this help list
	 --usage                Give a short usage message
     -V, --version              Print program version

   The struct argp_option array for the above could look like:

   {
     {"pid",       'p',      "PID",  0, "List the process PID"},
     {"pgrp",      OPT_PGRP, "PGRP", 0, "List processes in the process group PGRP"},
     {"no-parent", 'P',	      0,     0, "Include processes without parents"},
     {0,           'x',       0,     OPTION_ALIAS},
     {"all-fields",'Q',       0,     0, "Don't elide unusable fields (normally"
                                        " if there's some reason ps can't"
					" print a field for any process, it's"
                                        " removed from the output entirely)" },
     {"reverse",   'r',       0,     0, "Reverse the order of any sort"},
     {"gratuitously-long-reverse-option", 0, 0, OPTION_ALIAS},
     {"session",   OPT_SESS,  "SID", OPTION_ARG_OPTIONAL,
                                        "Add the processes from the session"
					" SID (which defaults to the sid of"
					" the current process)" },

     {0,0,0,0, "Here are some more options:"},
     {"foonly", 'f', "ZOT", 0, "Glork a foonly"},
     {"zaza", 'z', 0, 0, "Snit a zar"},

     {0}
   }

   Note that the last three options are automatically supplied by argp_parse,
   unless you tell it not to with ARGP_NO_HELP.

*/

/* Returns true if CH occurs between BEG and END.  */
static int
find_char (char ch, char *beg, char *end)
{
  while (beg < end)
    if (*beg == ch)
      return 1;
    else
      beg++;
  return 0;
}

struct hol_cluster;		/* fwd decl */

struct hol_entry
{
  /* First option.  */
  const struct argp_option *opt;
  /* Number of options (including aliases).  */
  unsigned num;

  /* A pointers into the HOL's short_options field, to the first short option
     letter for this entry.  The order of the characters following this point
     corresponds to the order of options pointed to by OPT, and there are at
     most NUM.  A short option recorded in a option following OPT is only
     valid if it occurs in the right place in SHORT_OPTIONS (otherwise it's
     probably been shadowed by some other entry).  */
  char *short_options;

  /* Entries are sorted by their group first, in the order:
       1, 2, ..., n, 0, -m, ..., -2, -1
     and then alphabetically within each group.  The default is 0.  */
  int group;

  /* The cluster of options this entry belongs to, or 0 if none.  */
  struct hol_cluster *cluster;

  /* The argp from which this option came.  */
  const struct argp *argp;
};

/* A cluster of entries to reflect the argp tree structure.  */
struct hol_cluster
{
  /* A descriptive header printed before options in this cluster.  */
  const char *header;

  /* Used to order clusters within the same group with the same parent,
     according to the order in which they occured in the parent argp's child
     list.  */
  int index;

  /* How to sort this cluster with respect to options and other clusters at the
     same depth (clusters always follow options in the same group).  */
  int group;

  /* The cluster to which this cluster belongs, or 0 if it's at the base
     level.  */
  struct hol_cluster *parent;

  /* The argp from which this cluster is (eventually) derived.  */
  const struct argp *argp;

  /* The distance this cluster is from the root.  */
  int depth;

  /* Clusters in a given hol are kept in a linked list, to make freeing them
     possible.  */
  struct hol_cluster *next;
};

/* A list of options for help.  */
struct hol
{
  /* An array of hol_entry's.  */
  struct hol_entry *entries;
  /* The number of entries in this hol.  If this field is zero, the others
     are undefined.  */
  unsigned num_entries;

  /* A string containing all short options in this HOL.  Each entry contains
     pointers into this string, so the order can't be messed with blindly.  */
  char *short_options;

  /* Clusters of entries in this hol.  */
  struct hol_cluster *clusters;
};

/* Create a struct hol from the options in ARGP.  CLUSTER is the
   hol_cluster in which these entries occur, or 0, if at the root.  */
static struct hol *
make_hol (const struct argp *argp, struct hol_cluster *cluster)
{
  char *so;
  const struct argp_option *o;
  const struct argp_option *opts = argp->options;
  struct hol_entry *entry;
  unsigned num_short_options = 0;
  struct hol *hol = malloc (sizeof (struct hol));

  assert (hol);

  hol->num_entries = 0;
  hol->clusters = 0;

  if (opts)
    {
      int cur_group = 0;

      /* The first option must not be an alias.  */
      assert (! oalias (opts));

      /* Calculate the space needed.  */
      for (o = opts; ! oend (o); o++)
	{
	  if (! oalias (o))
	    hol->num_entries++;
	  if (oshort (o))
	    num_short_options++;	/* This is an upper bound.  */
	}

      hol->entries = malloc (sizeof (struct hol_entry) * hol->num_entries);
      hol->short_options = malloc (num_short_options + 1);

      assert (hol->entries && hol->short_options);

      /* Fill in the entries.  */
      so = hol->short_options;
      for (o = opts, entry = hol->entries; ! oend (o); entry++)
	{
	  entry->opt = o;
	  entry->num = 0;
	  entry->short_options = so;
	  entry->group = cur_group =
	    o->group
	    ? o->group
	    : ((!o->name && !o->key)
	       ? cur_group + 1
	       : cur_group);
	  entry->cluster = cluster;
	  entry->argp = argp;

	  do
	    {
	      entry->num++;
	      if (oshort (o) && ! find_char (o->key, hol->short_options, so))
		/* O has a valid short option which hasn't already been used.*/
		*so++ = o->key;
	      o++;
	    }
	  while (! oend (o) && oalias (o));
	}
      *so = '\0';		/* null terminated so we can find the length */
    }

  return hol;
}

/* Add a new cluster to HOL, with the given GROUP and HEADER (taken from the
   associated argp child list entry), INDEX, and PARENT, and return a pointer
   to it.  ARGP is the argp that this cluster results from.  */
static struct hol_cluster *
hol_add_cluster (struct hol *hol, int group, const char *header, int index,
		 struct hol_cluster *parent, const struct argp *argp)
{
  struct hol_cluster *cl = malloc (sizeof (struct hol_cluster));
  if (cl)
    {
      cl->group = group;
      cl->header = header;

      cl->index = index;
      cl->parent = parent;
      cl->argp = argp;
      cl->depth = parent ? parent->depth + 1 : 0;

      cl->next = hol->clusters;
      hol->clusters = cl;
    }
  return cl;
}

/* Free HOL and any resources it uses.  */
static void
hol_free (struct hol *hol)
{
  struct hol_cluster *cl = hol->clusters;

  while (cl)
    {
      struct hol_cluster *next = cl->next;
      free (cl);
      cl = next;
    }

  if (hol->num_entries > 0)
    {
      free (hol->entries);
      free (hol->short_options);
    }

  free (hol);
}

static inline int
hol_entry_short_iterate (const struct hol_entry *entry,
			 int (*func)(const struct argp_option *opt,
				     const struct argp_option *real,
				     void *cookie),
			 void *cookie)
{
  unsigned nopts;
  int val = 0;
  const struct argp_option *opt, *real = entry->opt;
  char *so = entry->short_options;

  for (opt = real, nopts = entry->num; nopts > 0 && !val; opt++, nopts--)
    if (oshort (opt) && *so == opt->key)
      {
	if (!oalias (opt))
	  real = opt;
	if (ovisible (opt))
	  val = (*func)(opt, real, cookie);
	so++;
      }

  return val;
}

static inline int
hol_entry_long_iterate (const struct hol_entry *entry,
			int (*func)(const struct argp_option *opt,
				    const struct argp_option *real,
				    void *cookie),
			void *cookie)
{
  unsigned nopts;
  int val = 0;
  const struct argp_option *opt, *real = entry->opt;

  for (opt = real, nopts = entry->num; nopts > 0 && !val; opt++, nopts--)
    if (opt->name)
      {
	if (!oalias (opt))
	  real = opt;
	if (ovisible (opt))
	  val = (*func)(opt, real, cookie);
      }

  return val;
}

/* Iterator that returns true for the first short option.  */
static inline int
until_short (const struct argp_option *opt, const struct argp_option *real,
	     void *cookie)
{
  return oshort (opt) ? opt->key : 0;
}

/* Returns the first valid short option in ENTRY, or 0 if there is none.  */
static char
hol_entry_first_short (const struct hol_entry *entry)
{
  return hol_entry_short_iterate (entry, until_short, 0);
}

/* Returns the first valid long option in ENTRY, or 0 if there is none.  */
static const char *
hol_entry_first_long (const struct hol_entry *entry)
{
  const struct argp_option *opt;
  unsigned num;
  for (opt = entry->opt, num = entry->num; num > 0; opt++, num--)
    if (opt->name && ovisible (opt))
      return opt->name;
  return 0;
}

/* Returns the entry in HOL with the long option name NAME, or 0 if there is
   none.  */
static struct hol_entry *
hol_find_entry (struct hol *hol, const char *name)
{
  struct hol_entry *entry = hol->entries;
  unsigned num_entries = hol->num_entries;

  while (num_entries-- > 0)
    {
      const struct argp_option *opt = entry->opt;
      unsigned num_opts = entry->num;

      while (num_opts-- > 0)
	if (opt->name && ovisible (opt) && strcmp (opt->name, name) == 0)
	  return entry;
	else
	  opt++;

      entry++;
    }

  return 0;
}

/* If an entry with the long option NAME occurs in HOL, set it's special
   sort position to GROUP.  */
static void
hol_set_group (struct hol *hol, const char *name, int group)
{
  struct hol_entry *entry = hol_find_entry (hol, name);
  if (entry)
    entry->group = group;
}

/* Order by group:  0, 1, 2, ..., n, -m, ..., -2, -1.
   EQ is what to return if GROUP1 and GROUP2 are the same.  */
static int
group_cmp (int group1, int group2, int eq)
{
  if (group1 == group2)
    return eq;
  else if ((group1 < 0 && group2 < 0) || (group1 >= 0 && group2 >= 0))
    return group1 - group2;
  else
    return group2 - group1;
}

/* Compare clusters CL1 & CL2 by the order that they should appear in
   output.  */
static int
hol_cluster_cmp (const struct hol_cluster *cl1, const struct hol_cluster *cl2)
{
  /* If one cluster is deeper than the other, use its ancestor at the same
     level, so that finding the common ancestor is straightforward.  */
  while (cl1->depth < cl2->depth)
    cl1 = cl1->parent;
  while (cl2->depth < cl1->depth)
    cl2 = cl2->parent;

  /* Now reduce both clusters to their ancestors at the point where both have
     a common parent; these can be directly compared.  */
  while (cl1->parent != cl2->parent)
    cl1 = cl1->parent, cl2 = cl2->parent;

  return group_cmp (cl1->group, cl2->group, cl2->index - cl1->index);
}

/* Return the ancestor of CL that's just below the root (i.e., has a parent
   of 0).  */
static struct hol_cluster *
hol_cluster_base (struct hol_cluster *cl)
{
  while (cl->parent)
    cl = cl->parent;
  return cl;
}

/* Return true if CL1 is a child of CL2.  */
static int
hol_cluster_is_child (const struct hol_cluster *cl1,
		      const struct hol_cluster *cl2)
{
  while (cl1 && cl1 != cl2)
    cl1 = cl1->parent;
  return cl1 == cl2;
}

/* Given the name of a OPTION_DOC option, modifies NAME to start at the tail
   that should be used for comparisons, and returns true iff it should be
   treated as a non-option.  */
static int
canon_doc_option (const char **name)
{
  int non_opt;
  /* Skip initial whitespace.  */
  while (isspace (**name))
    (*name)++;
  /* Decide whether this looks like an option (leading `-') or not.  */
  non_opt = (**name != '-');
  /* Skip until part of name used for sorting.  */
  while (**name && !isalnum (**name))
    (*name)++;
  return non_opt;
}

/* Order ENTRY1 & ENTRY2 by the order which they should appear in a help
   listing.  */
static int
hol_entry_cmp (const struct hol_entry *entry1, const struct hol_entry *entry2)
{
  /* The group numbers by which the entries should be ordered; if either is
     in a cluster, then this is just the group within the cluster.  */
  int group1 = entry1->group, group2 = entry2->group;

  if (entry1->cluster != entry2->cluster)
    /* The entries are not within the same cluster, so we can't compare them
       directly, we have to use the appropiate clustering level too.  */
    if (! entry1->cluster)
      /* ENTRY1 is at the `base level', not in a cluster, so we have to
	 compare it's group number with that of the base cluster in which
	 ENTRY2 resides.  Note that if they're in the same group, the
	 clustered option always comes laster.  */
      return group_cmp (group1, hol_cluster_base (entry2->cluster)->group, -1);
    else if (! entry2->cluster)
      /* Likewise, but ENTRY2's not in a cluster.  */
      return group_cmp (hol_cluster_base (entry1->cluster)->group, group2, 1);
    else
      /* Both entries are in clusters, we can just compare the clusters.  */
      return hol_cluster_cmp (entry1->cluster, entry2->cluster);
  else if (group1 == group2)
    /* The entries are both in the same cluster and group, so compare them
       alphabetically.  */
    {
      int short1 = hol_entry_first_short (entry1);
      int short2 = hol_entry_first_short (entry2);
      int doc1 = odoc (entry1->opt);
      int doc2 = odoc (entry2->opt);
      const char *long1 = hol_entry_first_long (entry1);
      const char *long2 = hol_entry_first_long (entry2);

      if (doc1)
	doc1 = canon_doc_option (&long1);
      if (doc2)
	doc2 = canon_doc_option (&long2);

      if (doc1 != doc2)
	/* `documentation' options always follow normal options (or
	   documentation options that *look* like normal options).  */
	return doc1 - doc2;
      else if (!short1 && !short2 && long1 && long2)
	/* Only long options.  */
	return __strcasecmp (long1, long2);
      else
	/* Compare short/short, long/short, short/long, using the first
	   character of long options.  Entries without *any* valid
	   options (such as options with OPTION_HIDDEN set) will be put
	   first, but as they're not displayed, it doesn't matter where
	   they are.  */
	{
	  char first1 = short1 ? short1 : long1 ? *long1 : 0;
	  char first2 = short2 ? short2 : long2 ? *long2 : 0;
	  int lower_cmp = tolower (first1) - tolower (first2);
	  /* Compare ignoring case, except when the options are both the
	     same letter, in which case lower-case always comes first.  */
	  return lower_cmp ? lower_cmp : first2 - first1;
	}
    }
  else
    /* Within the same cluster, but not the same group, so just compare
       groups.  */
    return group_cmp (group1, group2, 0);
}

/* Version of hol_entry_cmp with correct signature for qsort.  */
static int
hol_entry_qcmp (const void *entry1_v, const void *entry2_v)
{
  return hol_entry_cmp (entry1_v, entry2_v);
}

/* Sort HOL by group and alphabetically by option name (with short options
   taking precedence over long).  Since the sorting is for display purposes
   only, the shadowing of options isn't effected.  */
static void
hol_sort (struct hol *hol)
{
  if (hol->num_entries > 0)
    qsort (hol->entries, hol->num_entries, sizeof (struct hol_entry),
	   hol_entry_qcmp);
}

/* Append MORE to HOL, destroying MORE in the process.  Options in HOL shadow
   any in MORE with the same name.  */
static void
hol_append (struct hol *hol, struct hol *more)
{
  struct hol_cluster **cl_end = &hol->clusters;

  /* Steal MORE's cluster list, and add it to the end of HOL's.  */
  while (*cl_end)
    cl_end = &(*cl_end)->next;
  *cl_end = more->clusters;
  more->clusters = 0;

  /* Merge entries.  */
  if (more->num_entries > 0)
    if (hol->num_entries == 0)
      {
	hol->num_entries = more->num_entries;
	hol->entries = more->entries;
	hol->short_options = more->short_options;
	more->num_entries = 0;	/* Mark MORE's fields as invalid.  */
      }
    else
      /* append the entries in MORE to those in HOL, taking care to only add
	 non-shadowed SHORT_OPTIONS values.  */
      {
	unsigned left;
	char *so, *more_so;
	struct hol_entry *e;
	unsigned num_entries = hol->num_entries + more->num_entries;
	struct hol_entry *entries =
	  malloc (num_entries * sizeof (struct hol_entry));
	unsigned hol_so_len = strlen (hol->short_options);
	char *short_options =
	  malloc (hol_so_len + strlen (more->short_options) + 1);

	memcpy (entries, hol->entries,
		hol->num_entries * sizeof (struct hol_entry));
	memcpy (entries + hol->num_entries, more->entries,
		more->num_entries * sizeof (struct hol_entry));

	memcpy (short_options, hol->short_options, hol_so_len);

	/* Fix up the short options pointers from HOL.  */
	for (e = entries, left = hol->num_entries; left > 0; e++, left--)
	  e->short_options += (short_options - hol->short_options);

	/* Now add the short options from MORE, fixing up its entries too.  */
	so = short_options + hol_so_len;
	more_so = more->short_options;
	for (left = more->num_entries; left > 0; e++, left--)
	  {
	    int opts_left;
	    const struct argp_option *opt;

	    e->short_options = so;

	    for (opts_left = e->num, opt = e->opt; opts_left; opt++, opts_left--)
	      {
		int ch = *more_so;
		if (oshort (opt) && ch == opt->key)
		  /* The next short option in MORE_SO, CH, is from OPT.  */
		  {
		    if (! find_char (ch, short_options,
				     short_options + hol_so_len))
		      /* The short option CH isn't shadowed by HOL's options,
			 so add it to the sum.  */
		      *so++ = ch;
		    more_so++;
		  }
	      }
	  }

	*so = '\0';

	free (hol->entries);
	free (hol->short_options);

	hol->entries = entries;
	hol->num_entries = num_entries;
	hol->short_options = short_options;
      }

  hol_free (more);
}

/* Inserts enough spaces to make sure STREAM is at column COL.  */
static void
indent_to (argp_fmtstream_t stream, unsigned col)
{
  int needed = col - __argp_fmtstream_point (stream);
  while (needed-- > 0)
    __argp_fmtstream_putc (stream, ' ');
}

/* Output to STREAM either a space, or a newline if there isn't room for at
   least ENSURE characters before the right margin.  */
static void
space (argp_fmtstream_t stream, size_t ensure)
{
  if (__argp_fmtstream_point (stream) + ensure
      >= __argp_fmtstream_rmargin (stream))
    __argp_fmtstream_putc (stream, '\n');
  else
    __argp_fmtstream_putc (stream, ' ');
}

/* If the option REAL has an argument, we print it in using the printf
   format REQ_FMT or OPT_FMT depending on whether it's a required or
   optional argument.  */
static void
arg (const struct argp_option *real, const char *req_fmt, const char *opt_fmt,
     argp_fmtstream_t stream)
{
  if (real->arg)
    if (real->flags & OPTION_ARG_OPTIONAL)
      __argp_fmtstream_printf (stream, opt_fmt, gettext (real->arg));
    else
      __argp_fmtstream_printf (stream, req_fmt, gettext (real->arg));
}

/* Helper functions for hol_entry_help.  */

/* State used during the execution of hol_help.  */
struct hol_help_state
{
  /* PREV_ENTRY should contain the previous entry printed, or 0.  */
  struct hol_entry *prev_entry;

  /* If an entry is in a different group from the previous one, and SEP_GROUPS
     is true, then a blank line will be printed before any output. */
  int sep_groups;

  /* True if a duplicate option argument was suppressed (only ever set if
     UPARAMS.dup_args is false).  */
  int suppressed_dup_arg;
};

/* Some state used while printing a help entry (used to communicate with
   helper functions).  See the doc for hol_entry_help for more info, as most
   of the fields are copied from its arguments.  */
struct pentry_state
{
  const struct hol_entry *entry;
  argp_fmtstream_t stream;
  struct hol_help_state *hhstate;

  /* True if nothing's been printed so far.  */
  int first;

  /* If non-zero, the state that was used to print this help.  */
  const struct argp_state *state;
};

/* If a user doc filter should be applied to DOC, do so.  */
static const char *
filter_doc (const char *doc, int key, const struct argp *argp,
	    const struct argp_state *state)
{
  if (argp->help_filter)
    /* We must apply a user filter to this output.  */
    {
      void *input = __argp_input (argp, state);
      return (*argp->help_filter) (key, doc, input);
    }
  else
    /* No filter.  */
    return (char *)doc;
}

/* Prints STR as a header line, with the margin lines set appropiately, and
   notes the fact that groups should be separated with a blank line.  ARGP is
   the argp that should dictate any user doc filtering to take place.  Note
   that the previous wrap margin isn't restored, but the left margin is reset
   to 0.  */
static void
print_header (const char *str, const struct argp *argp,
	      struct pentry_state *pest)
{
  const char *tstr = gettext (str);
  const char *fstr = filter_doc (tstr, ARGP_KEY_HELP_HEADER, argp, pest->state);

  if (fstr)
    {
      if (*fstr)
	{
	  if (pest->hhstate->prev_entry)
	    /* Precede with a blank line.  */
	    __argp_fmtstream_putc (pest->stream, '\n');
	  indent_to (pest->stream, uparams.header_col);
	  __argp_fmtstream_set_lmargin (pest->stream, uparams.header_col);
	  __argp_fmtstream_set_wmargin (pest->stream, uparams.header_col);
	  __argp_fmtstream_puts (pest->stream, fstr);
	  __argp_fmtstream_set_lmargin (pest->stream, 0);
	  __argp_fmtstream_putc (pest->stream, '\n');
	}

      pest->hhstate->sep_groups = 1; /* Separate subsequent groups. */
    }

  if (fstr != tstr)
    free ((char *) fstr);
}

/* Inserts a comma if this isn't the first item on the line, and then makes
   sure we're at least to column COL.  If this *is* the first item on a line,
   prints any pending whitespace/headers that should precede this line. Also
   clears FIRST.  */
static void
comma (unsigned col, struct pentry_state *pest)
{
  if (pest->first)
    {
      const struct hol_entry *pe = pest->hhstate->prev_entry;
      const struct hol_cluster *cl = pest->entry->cluster;

      if (pest->hhstate->sep_groups && pe && pest->entry->group != pe->group)
	__argp_fmtstream_putc (pest->stream, '\n');

      if (cl && cl->header && *cl->header
	  && (!pe
	      || (pe->cluster != cl
		  && !hol_cluster_is_child (pe->cluster, cl))))
	/* If we're changing clusters, then this must be the start of the
	   ENTRY's cluster unless that is an ancestor of the previous one
	   (in which case we had just popped into a sub-cluster for a bit).
	   If so, then print the cluster's header line.  */
	{
	  int old_wm = __argp_fmtstream_wmargin (pest->stream);
	  print_header (cl->header, cl->argp, pest);
	  __argp_fmtstream_set_wmargin (pest->stream, old_wm);
	}

      pest->first = 0;
    }
  else
    __argp_fmtstream_puts (pest->stream, ", ");

  indent_to (pest->stream, col);
}

/* Print help for ENTRY to STREAM.  */
static void
hol_entry_help (struct hol_entry *entry, const struct argp_state *state,
		argp_fmtstream_t stream, struct hol_help_state *hhstate)
{
  unsigned num;
  const struct argp_option *real = entry->opt, *opt;
  char *so = entry->short_options;
  int have_long_opt = 0;	/* We have any long options.  */
  /* Saved margins.  */
  int old_lm = __argp_fmtstream_set_lmargin (stream, 0);
  int old_wm = __argp_fmtstream_wmargin (stream);
  /* PEST is a state block holding some of our variables that we'd like to
     share with helper functions.  */
  struct pentry_state pest = { entry, stream, hhstate, 1, state };

  if (! odoc (real))
    for (opt = real, num = entry->num; num > 0; opt++, num--)
      if (opt->name && ovisible (opt))
	{
	  have_long_opt = 1;
	  break;
	}

  /* First emit short options.  */
  __argp_fmtstream_set_wmargin (stream, uparams.short_opt_col); /* For truly bizarre cases. */
  for (opt = real, num = entry->num; num > 0; opt++, num--)
    if (oshort (opt) && opt->key == *so)
      /* OPT has a valid (non shadowed) short option.  */
      {
	if (ovisible (opt))
	  {
	    comma (uparams.short_opt_col, &pest);
	    __argp_fmtstream_putc (stream, '-');
	    __argp_fmtstream_putc (stream, *so);
	    if (!have_long_opt || uparams.dup_args)
	      arg (real, " %s", "[%s]", stream);
	    else if (real->arg)
	      hhstate->suppressed_dup_arg = 1;
	  }
	so++;
      }

  /* Now, long options.  */
  if (odoc (real))
    /* A `documentation' option.  */
    {
      __argp_fmtstream_set_wmargin (stream, uparams.doc_opt_col);
      for (opt = real, num = entry->num; num > 0; opt++, num--)
	if (opt->name && ovisible (opt))
	  {
	    comma (uparams.doc_opt_col, &pest);
	    /* Calling gettext here isn't quite right, since sorting will
	       have been done on the original; but documentation options
	       should be pretty rare anyway...  */
	    __argp_fmtstream_puts (stream, gettext (opt->name));
	  }
    }
  else
    /* A real long option.  */
    {
      int first_long_opt = 1;

      __argp_fmtstream_set_wmargin (stream, uparams.long_opt_col);
      for (opt = real, num = entry->num; num > 0; opt++, num--)
	if (opt->name && ovisible (opt))
	  {
	    comma (uparams.long_opt_col, &pest);
	    __argp_fmtstream_printf (stream, "--%s", opt->name);
	    if (first_long_opt || uparams.dup_args)
	      arg (real, "=%s", "[=%s]", stream);
	    else if (real->arg)
	      hhstate->suppressed_dup_arg = 1;
	  }
    }

  /* Next, documentation strings.  */
  __argp_fmtstream_set_lmargin (stream, 0);

  if (pest.first)
    /* Didn't print any switches, what's up?  */
    if (!oshort (real) && !real->name)
      /* This is a group header, print it nicely.  */
      print_header (real->doc, entry->argp, &pest);
    else
      /* Just a totally shadowed option or null header; print nothing.  */
      goto cleanup;		/* Just return, after cleaning up.  */
  else
    {
      const char *tstr = real->doc ? gettext (real->doc) : 0;
      const char *fstr = filter_doc (tstr, real->key, entry->argp, state);
      if (fstr && *fstr)
	{
	  unsigned int col = __argp_fmtstream_point (stream);

	  __argp_fmtstream_set_lmargin (stream, uparams.opt_doc_col);
	  __argp_fmtstream_set_wmargin (stream, uparams.opt_doc_col);

	  if (col > (unsigned int) (uparams.opt_doc_col + 3))
	    __argp_fmtstream_putc (stream, '\n');
	  else if (col >= (unsigned int) uparams.opt_doc_col)
	    __argp_fmtstream_puts (stream, "   ");
	  else
	    indent_to (stream, uparams.opt_doc_col);

	  __argp_fmtstream_puts (stream, fstr);
	}
      if (fstr && fstr != tstr)
	free ((char *) fstr);

      /* Reset the left margin.  */
      __argp_fmtstream_set_lmargin (stream, 0);
      __argp_fmtstream_putc (stream, '\n');
    }

  hhstate->prev_entry = entry;

cleanup:
  __argp_fmtstream_set_lmargin (stream, old_lm);
  __argp_fmtstream_set_wmargin (stream, old_wm);
}

/* Output a long help message about the options in HOL to STREAM.  */
static void
hol_help (struct hol *hol, const struct argp_state *state,
	  argp_fmtstream_t stream)
{
  unsigned num;
  struct hol_entry *entry;
  struct hol_help_state hhstate = { 0, 0, 0 };

  for (entry = hol->entries, num = hol->num_entries; num > 0; entry++, num--)
    hol_entry_help (entry, state, stream, &hhstate);

  if (hhstate.suppressed_dup_arg && uparams.dup_args_note)
    {
      const char *tstr = _("\
Mandatory or optional arguments to long options are also mandatory or \
optional for any corresponding short options.");
      const char *fstr = filter_doc (tstr, ARGP_KEY_HELP_DUP_ARGS_NOTE,
				     state ? state->root_argp : 0, state);
      if (fstr && *fstr)
	{
	  __argp_fmtstream_putc (stream, '\n');
	  __argp_fmtstream_puts (stream, fstr);
	  __argp_fmtstream_putc (stream, '\n');
	}
      if (fstr && fstr != tstr)
	free ((char *) fstr);
    }
}

/* Helper functions for hol_usage.  */

/* If OPT is a short option without an arg, append its key to the string
   pointer pointer to by COOKIE, and advance the pointer.  */
static int
add_argless_short_opt (const struct argp_option *opt,
		       const struct argp_option *real,
		       void *cookie)
{
  char **snao_end = cookie;
  if (!(opt->arg || real->arg)
      && !((opt->flags | real->flags) & OPTION_NO_USAGE))
    *(*snao_end)++ = opt->key;
  return 0;
}

/* If OPT is a short option with an arg, output a usage entry for it to the
   stream pointed at by COOKIE.  */
static int
usage_argful_short_opt (const struct argp_option *opt,
			const struct argp_option *real,
			void *cookie)
{
  argp_fmtstream_t stream = cookie;
  const char *arg = opt->arg;
  int flags = opt->flags | real->flags;

  if (! arg)
    arg = real->arg;

  if (arg && !(flags & OPTION_NO_USAGE))
    {
      arg = gettext (arg);

      if (flags & OPTION_ARG_OPTIONAL)
	__argp_fmtstream_printf (stream, " [-%c[%s]]", opt->key, arg);
      else
	{
	  /* Manually do line wrapping so that it (probably) won't
	     get wrapped at the embedded space.  */
	  space (stream, 6 + strlen (arg));
	  __argp_fmtstream_printf (stream, "[-%c %s]", opt->key, arg);
	}
    }

  return 0;
}

/* Output a usage entry for the long option opt to the stream pointed at by
   COOKIE.  */
static int
usage_long_opt (const struct argp_option *opt,
		const struct argp_option *real,
		void *cookie)
{
  argp_fmtstream_t stream = cookie;
  const char *arg = opt->arg;
  int flags = opt->flags | real->flags;

  if (! arg)
    arg = real->arg;

  if (! (flags & OPTION_NO_USAGE))
    if (arg)
      {
	arg = gettext (arg);
	if (flags & OPTION_ARG_OPTIONAL)
	  __argp_fmtstream_printf (stream, " [--%s[=%s]]", opt->name, arg);
	else
	  __argp_fmtstream_printf (stream, " [--%s=%s]", opt->name, arg);
      }
    else
      __argp_fmtstream_printf (stream, " [--%s]", opt->name);

  return 0;
}

/* Print a short usage description for the arguments in HOL to STREAM.  */
static void
hol_usage (struct hol *hol, argp_fmtstream_t stream)
{
  if (hol->num_entries > 0)
    {
      unsigned nentries;
      struct hol_entry *entry;
      char *short_no_arg_opts = alloca (strlen (hol->short_options) + 1);
      char *snao_end = short_no_arg_opts;

      /* First we put a list of short options without arguments.  */
      for (entry = hol->entries, nentries = hol->num_entries
	   ; nentries > 0
	   ; entry++, nentries--)
	hol_entry_short_iterate (entry, add_argless_short_opt, &snao_end);
      if (snao_end > short_no_arg_opts)
	{
	  *snao_end++ = 0;
	  __argp_fmtstream_printf (stream, " [-%s]", short_no_arg_opts);
	}

      /* Now a list of short options *with* arguments.  */
      for (entry = hol->entries, nentries = hol->num_entries
	   ; nentries > 0
	   ; entry++, nentries--)
	hol_entry_short_iterate (entry, usage_argful_short_opt, stream);

      /* Finally, a list of long options (whew!).  */
      for (entry = hol->entries, nentries = hol->num_entries
	   ; nentries > 0
	   ; entry++, nentries--)
	hol_entry_long_iterate (entry, usage_long_opt, stream);
    }
}

/* Make a HOL containing all levels of options in ARGP.  CLUSTER is the
   cluster in which ARGP's entries should be clustered, or 0.  */
static struct hol *
argp_hol (const struct argp *argp, struct hol_cluster *cluster)
{
  const struct argp_child *child = argp->children;
  struct hol *hol = make_hol (argp, cluster);
  if (child)
    while (child->argp)
      {
	struct hol_cluster *child_cluster =
	  ((child->group || child->header)
	   /* Put CHILD->argp within its own cluster.  */
	   ? hol_add_cluster (hol, child->group, child->header,
			      child - argp->children, cluster, argp)
	   /* Just merge it into the parent's cluster.  */
	   : cluster);
	hol_append (hol, argp_hol (child->argp, child_cluster)) ;
	child++;
      }
  return hol;
}

/* Calculate how many different levels with alternative args strings exist in
   ARGP.  */
static size_t
argp_args_levels (const struct argp *argp)
{
  size_t levels = 0;
  const struct argp_child *child = argp->children;

  if (argp->args_doc && strchr (argp->args_doc, '\n'))
    levels++;

  if (child)
    while (child->argp)
      levels += argp_args_levels ((child++)->argp);

  return levels;
}

/* Print all the non-option args documented in ARGP to STREAM.  Any output is
   preceded by a space.  LEVELS is a pointer to a byte vector the length
   returned by argp_args_levels; it should be initialized to zero, and
   updated by this routine for the next call if ADVANCE is true.  True is
   returned as long as there are more patterns to output.  */
static int
argp_args_usage (const struct argp *argp, const struct argp_state *state,
		 char **levels, int advance, argp_fmtstream_t stream)
{
  char *our_level = *levels;
  int multiple = 0;
  const struct argp_child *child = argp->children;
  const char *tdoc = gettext (argp->args_doc), *nl = 0;
  const char *fdoc = filter_doc (tdoc, ARGP_KEY_HELP_ARGS_DOC,
				 state ? state->root_argp : 0, state);

  if (fdoc)
    {
      nl = strchr (fdoc, '\n');
      if (nl)
	/* This is a `multi-level' args doc; advance to the correct position
	   as determined by our state in LEVELS, and update LEVELS.  */
	{
	  int i;
	  multiple = 1;
	  for (i = 0; i < *our_level; i++)
	    fdoc = nl + 1, nl = strchr (fdoc, '\n');
	  (*levels)++;
	}
      if (! nl)
	nl = fdoc + strlen (fdoc);

      /* Manually do line wrapping so that it (probably) won't get wrapped at
	 any embedded spaces.  */
      space (stream, 1 + nl - fdoc);

      __argp_fmtstream_write (stream, fdoc, nl - fdoc);
    }
  if (fdoc && fdoc != tdoc)
    free ((char *)fdoc);	/* Free user's modified doc string.  */

  if (child)
    while (child->argp)
      advance = !argp_args_usage ((child++)->argp, state, levels, advance, stream);

  if (advance && multiple)
    /* Need to increment our level.  */
    if (*nl)
      /* There's more we can do here.  */
      {
	(*our_level)++;
	advance = 0;		/* Our parent shouldn't advance also. */
      }
    else if (*our_level > 0)
      /* We had multiple levels, but used them up; reset to zero.  */
      *our_level = 0;

  return !advance;
}

/* Print the documentation for ARGP to STREAM; if POST is false, then
   everything preceeding a `\v' character in the documentation strings (or
   the whole string, for those with none) is printed, otherwise, everything
   following the `\v' character (nothing for strings without).  Each separate
   bit of documentation is separated a blank line, and if PRE_BLANK is true,
   then the first is as well.  If FIRST_ONLY is true, only the first
   occurance is output.  Returns true if anything was output.  */
static int
argp_doc (const struct argp *argp, const struct argp_state *state,
	  int post, int pre_blank, int first_only,
	  argp_fmtstream_t stream)
{
  const char *text;
  const char *inp_text;
  void *input = 0;
  int anything = 0;
  size_t inp_text_limit = 0;
  const char *doc = gettext (argp->doc);
  const struct argp_child *child = argp->children;

  if (doc)
    {
      char *vt = strchr (doc, '\v');
      inp_text = post ? (vt ? vt + 1 : 0) : doc;
      inp_text_limit = (!post && vt) ? (vt - doc) : 0;
    }
  else
    inp_text = 0;

  if (argp->help_filter)
    /* We have to filter the doc strings.  */
    {
      if (inp_text_limit)
	/* Copy INP_TEXT so that it's nul-terminated.  */
	inp_text = strndup (inp_text, inp_text_limit);
      input = __argp_input (argp, state);
      text =
	(*argp->help_filter) (post
			      ? ARGP_KEY_HELP_POST_DOC
			      : ARGP_KEY_HELP_PRE_DOC,
			      inp_text, input);
    }
  else
    text = (const char *) inp_text;

  if (text)
    {
      if (pre_blank)
	__argp_fmtstream_putc (stream, '\n');

      if (text == inp_text && inp_text_limit)
	__argp_fmtstream_write (stream, inp_text, inp_text_limit);
      else
	__argp_fmtstream_puts (stream, text);

      if (__argp_fmtstream_point (stream) > __argp_fmtstream_lmargin (stream))
	__argp_fmtstream_putc (stream, '\n');

      anything = 1;
    }

  if (text && text != inp_text)
    free ((char *) text);	/* Free TEXT returned from the help filter.  */
  if (inp_text && inp_text_limit && argp->help_filter)
    free ((char *) inp_text);	/* We copied INP_TEXT, so free it now.  */

  if (post && argp->help_filter)
    /* Now see if we have to output a ARGP_KEY_HELP_EXTRA text.  */
    {
      text = (*argp->help_filter) (ARGP_KEY_HELP_EXTRA, 0, input);
      if (text)
	{
	  if (anything || pre_blank)
	    __argp_fmtstream_putc (stream, '\n');
	  __argp_fmtstream_puts (stream, text);
	  free ((char *) text);
	  if (__argp_fmtstream_point (stream)
	      > __argp_fmtstream_lmargin (stream))
	    __argp_fmtstream_putc (stream, '\n');
	  anything = 1;
	}
    }

  if (child)
    while (child->argp && !(first_only && anything))
      anything |=
	argp_doc ((child++)->argp, state,
		  post, anything || pre_blank, first_only,
		  stream);

  return anything;
}

/* Output a usage message for ARGP to STREAM.  If called from
   argp_state_help, STATE is the relevent parsing state.  FLAGS are from the
   set ARGP_HELP_*.  NAME is what to use wherever a `program name' is
   needed. */
static void
_help (const struct argp *argp, const struct argp_state *state, FILE *stream,
       unsigned flags, char *name)
{
  int anything = 0;		/* Whether we've output anything.  */
  struct hol *hol = 0;
  argp_fmtstream_t fs;

  if (! stream)
    return;

  if (! uparams.valid)
    fill_in_uparams (state);

  fs = __argp_make_fmtstream (stream, 0, uparams.rmargin, 0);
  if (! fs)
    return;

  if (flags & (ARGP_HELP_USAGE | ARGP_HELP_SHORT_USAGE | ARGP_HELP_LONG))
    {
      hol = argp_hol (argp, 0);

      /* If present, these options always come last.  */
      hol_set_group (hol, "help", -1);
      hol_set_group (hol, "version", -1);

      hol_sort (hol);
    }

  if (flags & (ARGP_HELP_USAGE | ARGP_HELP_SHORT_USAGE))
    /* Print a short `Usage:' message.  */
    {
      int first_pattern = 1, more_patterns;
      size_t num_pattern_levels = argp_args_levels (argp);
      char *pattern_levels = alloca (num_pattern_levels);

      memset (pattern_levels, 0, num_pattern_levels);

      do
	{
	  int old_lm;
	  int old_wm = __argp_fmtstream_set_wmargin (fs, USAGE_INDENT);
	  char *levels = pattern_levels;

	  __argp_fmtstream_printf (fs, "%s %s",
				   _(first_pattern ? "Usage:" : "  or: "),
				   name);

	  /* We set the lmargin as well as the wmargin, because hol_usage
	     manually wraps options with newline to avoid annoying breaks.  */
	  old_lm = __argp_fmtstream_set_lmargin (fs, USAGE_INDENT);

	  if (flags & ARGP_HELP_SHORT_USAGE)
	    /* Just show where the options go.  */
	    {
	      if (hol->num_entries > 0)
		__argp_fmtstream_puts (fs, _(" [OPTION...]"));
	    }
	  else
	    /* Actually print the options.  */
	    {
	      hol_usage (hol, fs);
	      flags |= ARGP_HELP_SHORT_USAGE; /* But only do so once.  */
	    }

	  more_patterns = argp_args_usage (argp, state, &levels, 1, fs);

	  __argp_fmtstream_set_wmargin (fs, old_wm);
	  __argp_fmtstream_set_lmargin (fs, old_lm);

	  __argp_fmtstream_putc (fs, '\n');
	  anything = 1;

	  first_pattern = 0;
	}
      while (more_patterns);
    }

  if (flags & ARGP_HELP_PRE_DOC)
    anything |= argp_doc (argp, state, 0, 0, 1, fs);

  if (flags & ARGP_HELP_SEE)
    {
      __argp_fmtstream_printf (fs, _("\
Try `%s --help' or `%s --usage' for more information.\n"),
			       name, name);
      anything = 1;
    }

  if (flags & ARGP_HELP_LONG)
    /* Print a long, detailed help message.  */
    {
      /* Print info about all the options.  */
      if (hol->num_entries > 0)
	{
	  if (anything)
	    __argp_fmtstream_putc (fs, '\n');
	  hol_help (hol, state, fs);
	  anything = 1;
	}
    }

  if (flags & ARGP_HELP_POST_DOC)
    /* Print any documentation strings at the end.  */
    anything |= argp_doc (argp, state, 1, anything, 0, fs);

  if ((flags & ARGP_HELP_BUG_ADDR) && argp_program_bug_address)
    {
      if (anything)
	__argp_fmtstream_putc (fs, '\n');
      __argp_fmtstream_printf (fs, _("Report bugs to %s.\n"),
 			       argp_program_bug_address);
      anything = 1;
    }

  if (hol)
    hol_free (hol);

  __argp_fmtstream_free (fs);
}

/* Output a usage message for ARGP to STREAM.  FLAGS are from the set
   ARGP_HELP_*.  NAME is what to use wherever a `program name' is needed. */
void __argp_help (const struct argp *argp, FILE *stream,
		  unsigned flags, char *name)
{
  _help (argp, 0, stream, flags, name);
}
#ifdef weak_alias
weak_alias (__argp_help, argp_help)
#endif

/* Output, if appropriate, a usage message for STATE to STREAM.  FLAGS are
   from the set ARGP_HELP_*.  */
void
__argp_state_help (const struct argp_state *state, FILE *stream, unsigned flags)
{
  if ((!state || ! (state->flags & ARGP_NO_ERRS)) && stream)
    {
      if (state && (state->flags & ARGP_LONG_ONLY))
	flags |= ARGP_HELP_LONG_ONLY;

      _help (state ? state->root_argp : 0, state, stream, flags,
	     state ? state->name : program_invocation_short_name);

      if (!state || ! (state->flags & ARGP_NO_EXIT))
	{
	  if (flags & ARGP_HELP_EXIT_ERR)
	    exit (argp_err_exit_status);
	  if (flags & ARGP_HELP_EXIT_OK)
	    exit (0);
	}
  }
}
#ifdef weak_alias
weak_alias (__argp_state_help, argp_state_help)
#endif

/* If appropriate, print the printf string FMT and following args, preceded
   by the program name and `:', to stderr, and followed by a `Try ... --help'
   message, then exit (1).  */
void
__argp_error (const struct argp_state *state, const char *fmt, ...)
{
  if (!state || !(state->flags & ARGP_NO_ERRS))
    {
      FILE *stream = state ? state->err_stream : stderr;

      if (stream)
	{
	  va_list ap;

	  fputs (state ? state->name : program_invocation_short_name, stream);
	  putc (':', stream);
	  putc (' ', stream);

	  va_start (ap, fmt);
	  vfprintf (stream, fmt, ap);
	  va_end (ap);

	  putc ('\n', stream);

	  __argp_state_help (state, stream, ARGP_HELP_STD_ERR);
	}
    }
}
#ifdef weak_alias
weak_alias (__argp_error, argp_error)
#endif

/* Similar to the standard gnu error-reporting function error(), but will
   respect the ARGP_NO_EXIT and ARGP_NO_ERRS flags in STATE, and will print
   to STATE->err_stream.  This is useful for argument parsing code that is
   shared between program startup (when exiting is desired) and runtime
   option parsing (when typically an error code is returned instead).  The
   difference between this function and argp_error is that the latter is for
   *parsing errors*, and the former is for other problems that occur during
   parsing but don't reflect a (syntactic) problem with the input.  */
void
__argp_failure (const struct argp_state *state, int status, int errnum,
		const char *fmt, ...)
{
  if (!state || !(state->flags & ARGP_NO_ERRS))
    {
      FILE *stream = state ? state->err_stream : stderr;

      if (stream)
	{
	  fputs (state ? state->name : program_invocation_short_name, stream);

	  if (fmt)
	    {
	      va_list ap;

	      putc (':', stream);
	      putc (' ', stream);

	      va_start (ap, fmt);
	      vfprintf (stream, fmt, ap);
	      va_end (ap);
	    }

	  if (errnum)
	    {
	      putc (':', stream);
	      putc (' ', stream);
	      fputs (strerror (errnum), stream);
	    }

	  putc ('\n', stream);

	  if (status && (!state || !(state->flags & ARGP_NO_EXIT)))
	    exit (status);
	}
    }
}
#ifdef weak_alias
weak_alias (__argp_failure, argp_failure)
#endif