summaryrefslogtreecommitdiff
path: root/man/help2man
blob: d6f7a6567deb6fad88d23570ee29334018cd673e (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
#!/usr/bin/perl -w

# Generate a short man page from --help and --version output.
# Copyright © 1997, 1998, 1999, 2000 Free Software Foundation, Inc.

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

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

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

# Written by Brendan O'Dea <bod@compusol.com.au>
# Available from ftp://ftp.gnu.org/gnu/help2man/

use 5.004;
use strict;
use Getopt::Long;
use Text::Tabs qw(expand);
use POSIX qw(strftime setlocale LC_TIME);

my $this_program = 'help2man';
my $this_version = '1.23';
my $version_info = <<EOT;
GNU $this_program $this_version

Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Written by Brendan O'Dea <bod\@compusol.com.au>
EOT

my $help_info = <<EOT;
`$this_program' generates a man page out of `--help' and `--version' output.

Usage: $this_program [OPTION]... EXECUTABLE

 -n, --name=STRING       use `STRING' as the description for the NAME paragraph
 -s, --section=SECTION   use `SECTION' as the section for the man page
 -i, --include=FILE      include material from `FILE'
 -I, --opt-include=FILE  include material from `FILE' if it exists
 -o, --output=FILE       send output to `FILE'
 -N, --no-info           suppress pointer to Texinfo manual
     --help              print this help, then exit
     --version           print version number, then exit

EXECUTABLE should accept `--help' and `--version' options.

Report bugs to <bug-help2man\@gnu.org>.
EOT

my $section = 1;
my ($opt_name, @opt_include, $opt_output, $opt_no_info);

# Parse options.
Getopt::Long::config('bundling');
GetOptions (
    'n|name=s'		=> \$opt_name,
    's|section=s'	=> \$section,
    'i|include=s'	=> sub { push @opt_include, [ pop, 1 ] },
    'I|opt-include=s'	=> sub { push @opt_include, [ pop, 0 ] },
    'o|output=s'	=> \$opt_output,
    'N|no-info'		=> \$opt_no_info,
    help		=> sub { print $help_info; exit },
    version		=> sub { print $version_info; exit },
) or die $help_info;

die $help_info unless @ARGV == 1;

my %include = ();
my %append = ();
my @include = (); # retain order given in include file

# Provide replacement `quote-regex' operator for pre-5.005.
BEGIN { eval q(sub qr { '' =~ $_[0]; $_[0] }) if $] < 5.005 }

# Process include file (if given).  Format is:
#
#   [section name]
#   verbatim text
#
# or
#
#   /pattern/
#   verbatim text
#

for (@opt_include)
{
    my ($inc, $required) = @$_;

    next unless -f $inc or $required;
    die "$this_program: can't open `$inc' ($!)\n"
	unless open INC, $inc;

    my $key;
    my $hash = \%include;

    while (<INC>)
    {
	# [section]
	if (/^\[([^]]+)\]/)
	{
	    $key = uc $1;
	    $key =~ s/^\s+//;
	    $key =~ s/\s+$//;
	    $hash = \%include;
	    push @include, $key unless $include{$key};
	    next;
	}

	# /pattern/
	if (m!^/(.*)/([ims]*)!)
	{
	    my $pat = $2 ? "(?$2)$1" : $1;

	    # Check pattern.
	    eval { $key = qr($pat) };
	    if ($@)
	    {
		$@ =~ s/ at .*? line \d.*//;
		die "$inc:$.:$@";
	    }

	    $hash = \%append;
	    next;
	}

	# Silently ignore anything before the first
	# section--allows for comments and revision info.
	next unless $key;

	$hash->{$key} ||= '';
	$hash->{$key} .= $_;
    }

    close INC;

    die "$this_program: no valid information found in `$inc'\n"
	unless $key;
}

# Compress trailing blank lines.
for my $hash (\(%include, %append))
{
    for (keys %$hash) { $hash->{$_} =~ s/\n+$/\n/ }
}

# Turn off localisation of executable's ouput.
@ENV{qw(LANGUAGE LANG LC_ALL)} = ('C') x 3;

# Turn off localisation of date (for strftime).
setlocale LC_TIME, 'C';

# Grab help and version info from executable.
my ($help_text, $version_text) = map {
    join '', map { s/ +$//; expand $_ } `$ARGV[0] --$_ 2>/dev/null`
	or die "$this_program: can't get `--$_' info from $ARGV[0]\n"
} qw(help version);

my $date = strftime "%B %Y", localtime;
(my $program = $ARGV[0]) =~ s!.*/!!;
my $package = $program;
my $version;

if ($opt_output)
{
    unlink $opt_output
	or die "$this_program: can't unlink $opt_output ($!)\n"
	if -e $opt_output;

    open STDOUT, ">$opt_output"
	or die "$this_program: can't create $opt_output ($!)\n";
}

# The first line of the --version information is assumed to be in one
# of the following formats:
#
#   <version>
#   <program> <version>
#   {GNU,Free} <program> <version>
#   <program> ({GNU,Free} <package>) <version>
#   <program> - {GNU,Free} <package> <version>
#
# and seperated from any copyright/author details by a blank line.

($_, $version_text) = split /\n+/, $version_text, 2;

if (/^(\S+) +\(((?:GNU|Free) +[^)]+)\) +(.*)/ or
    /^(\S+) +- *((?:GNU|Free) +\S+) +(.*)/)
{
    $program = $1;
    $package = $2;
    $version = $3;
}
elsif (/^((?:GNU|Free) +)?(\S+) +(.*)/)
{
    $program = $2;
    $package = $1 ? "$1$2" : $2;
    $version = $3;
}
else
{
    $version = $_;
}

$program =~ s!.*/!!;

# No info for `info' itself.
$opt_no_info = 1 if $program eq 'info';

# --name overrides --include contents.
$include{NAME} = "$program \\- $opt_name\n" if $opt_name;

# Default (useless) NAME paragraph.
$include{NAME} ||= "$program \\- manual page for $program $version\n";

# Man pages traditionally have the page title in caps.
my $PROGRAM = uc $program;

# Extract usage clause(s) [if any] for SYNOPSIS.
if ($help_text =~ s/^Usage:( +(\S+))(.*)((?:\n(?: {6}\1| *or: +\S).*)*)//m)
{
    my @syn = $2 . $3;

    if ($_ = $4)
    {
	s/^\n//;
	for (split /\n/) { s/^ *(or: +)?//; push @syn, $_ }
    }

    my $synopsis = '';
    for (@syn)
    {
	$synopsis .= ".br\n" if $synopsis;
	s!^\S*/!!;
	s/^(\S+) *//;
	$synopsis .= ".B $1\n";
	s/\s+$//;
	s/(([][]|\.\.+)+)/\\fR$1\\fI/g;
	s/^/\\fI/ unless s/^\\fR//;
	$_ .= '\fR';
	s/(\\fI)( *)/$2$1/g;
	s/\\fI\\fR//g;
	s/^\\fR//;
	s/\\fI$//;
	s/^\./\\&./;

	$synopsis .= "$_\n";
    }

    $include{SYNOPSIS} ||= $synopsis;
}

# Process text, initial section is DESCRIPTION.
my $sect = 'DESCRIPTION';
$_ = "$help_text\n\n$version_text";

# Normalise paragraph breaks.
s/^\n+//;
s/\n*$/\n/;
s/\n\n+/\n\n/g;

# Temporarily exchange leading dots, apostrophes and backslashes for
# tokens.
s/^\./\x80/mg;
s/^'/\x81/mg;
s/\\/\x82/g;

# Start a new paragraph (if required) for these.
s/([^\n])\n(Report +bugs|Email +bug +reports +to|Written +by)/$1\n\n$2/g;

sub convert_option;

while (length)
{
    # Convert some standard paragraph names.
    if (s/^(Options|Examples): *\n//)
    {
	$sect = uc $1;
	next;
    }

    # Copyright section
    if (/^Copyright +[(\xa9]/)
    {
	$sect = 'COPYRIGHT';
	$include{$sect} ||= '';
	$include{$sect} .= ".PP\n" if $include{$sect};

	my $copy;
	($copy, $_) = split /\n\n/, $_, 2;

	for ($copy)
	{
	    # Add back newline
	    s/\n*$/\n/;

	    # Convert iso9959-1 copyright symbol or (c) to nroff
	    # character.
	    s/^Copyright +(?:\xa9|\([Cc]\))/Copyright \\(co/mg;

	    # Insert line breaks before additional copyright messages
	    # and the disclaimer.
	    s/(.)\n(Copyright |This +is +free +software)/$1\n.br\n$2/g;

	    # Join hyphenated lines.
	    s/([A-Za-z])-\n */$1/g;
	}

	$include{$sect} .= $copy;
	$_ ||= '';
	next;
    }

    # Catch bug report text.
    if (/^(Report +bugs|Email +bug +reports +to) /)
    {
	$sect = 'REPORTING BUGS';
    }

    # Author section.
    elsif (/^Written +by/)
    {
	$sect = 'AUTHOR';
    }

    # Examples, indicated by an indented leading $, % or > are
    # rendered in a constant width font.
    if (/^( +)([\$\%>] )\S/)
    {
	my $indent = $1;
	my $prefix = $2;
	my $break = '.IP';
	$include{$sect} ||= '';
	while (s/^$indent\Q$prefix\E(\S.*)\n*//)
	{
	    $include{$sect} .= "$break\n\\f(CW$prefix$1\\fR\n";
	    $break = '.br';
	}

	next;
    }

    my $matched = '';
    $include{$sect} ||= '';

    # Sub-sections have a trailing colon and the second line indented.
    if (s/^(\S.*:) *\n / /)
    {
	$matched .= $& if %append;
	$include{$sect} .= qq(.SS "$1"\n);
    }

    my $indent = 0;
    my $content = '';

    # Option with description.
    if (s/^( {1,10}([+-]\S.*?))(?:(  +)|\n( {20,}))(\S.*)\n//)
    {
	$matched .= $& if %append;
	$indent = length ($4 || "$1$3");
	$content = ".TP\n\x83$2\n\x83$5\n";
	unless ($4)
	{
	    # Indent may be different on second line.
	    $indent = length $& if /^ {20,}/;
	}
    }

    # Option without description.
    elsif (s/^ {1,10}([+-]\S.*)\n//)
    {
	$matched .= $& if %append;
	$content = ".HP\n\x83$1\n";
	$indent = 80; # not continued
    }

    # Indented paragraph with tag.
    elsif (s/^( +(\S.*?)  +)(\S.*)\n//)
    {
	$matched .= $& if %append;
	$indent = length $1;
	$content = ".TP\n\x83$2\n\x83$3\n";
    }

    # Indented paragraph.
    elsif (s/^( +)(\S.*)\n//)
    {
	$matched .= $& if %append;
	$indent = length $1;
	$content = ".IP\n\x83$2\n";
    }

    # Left justified paragraph.
    else
    {
	s/(.*)\n//;
	$matched .= $& if %append;
	$content = ".PP\n" if $include{$sect};
	$content .= "$1\n";
    }

    # Append continuations.
    while (s/^ {$indent}(\S.*)\n//)
    {
	$matched .= $& if %append;
	$content .= "\x83$1\n"
    }

    # Move to next paragraph.
    s/^\n+//;

    for ($content)
    {
	# Leading dot and apostrophe protection.
	s/\x83\./\x80/g;
	s/\x83'/\x81/g;
	s/\x83//g;

	# Convert options.
	s/(^| )(-[][\w=-]+)/$1 . convert_option $2/mge;
    }

    # Check if matched paragraph contains /pat/.
    if (%append)
    {
	for my $pat (keys %append)
	{
	    if ($matched =~ $pat)
	    {
		$content .= ".PP\n" unless $append{$pat} =~ /^\./;
		$content .= $append{$pat};
	    }
	}
    }

    $include{$sect} .= $content;
}

# Refer to the real documentation.
unless ($opt_no_info)
{
    $sect = 'SEE ALSO';
    $include{$sect} ||= '';
    $include{$sect} .= ".PP\n" if $include{$sect};
    $include{$sect} .= <<EOT;
The full documentation for
.B $program
is maintained as a Texinfo manual.  If the
.B info
and
.B $program
programs are properly installed at your site, the command
.IP
.B info $program
.PP
should give you access to the complete manual.
EOT
}

# Output header.
print <<EOT;
.\\" DO NOT MODIFY THIS FILE!  It was generated by $this_program $this_version.
.TH $PROGRAM "$section" "$date" "$package $version" FSF
EOT

# Section ordering.
my @pre = qw(NAME SYNOPSIS DESCRIPTION OPTIONS EXAMPLES);
my @post = ('AUTHOR', 'REPORTING BUGS', 'COPYRIGHT', 'SEE ALSO');
my $filter = join '|', @pre, @post;

# Output content.
for (@pre, (grep ! /^($filter)$/o, @include), @post)
{
    if ($include{$_})
    {
	my $quote = /\W/ ? '"' : '';
	print ".SH $quote$_$quote\n";

	for ($include{$_})
	{
	    # Replace leading dot, apostrophe and backslash tokens.
	    s/\x80/\\&./g;
	    s/\x81/\\&'/g;
	    s/\x82/\\e/g;
	    print;
	}
    }
}

exit;

# Convert option dashes to \- to stop nroff from hyphenating 'em, and
# embolden.  Option arguments get italicised.
sub convert_option
{
    local $_ = '\fB' . shift;

    s/-/\\-/g;
    unless (s/\[=(.*)\]$/\\fR[=\\fI$1\\fR]/)
    {
	s/=(.)/\\fR=\\fI$1/;
	s/ (.)/ \\fI$1/;
	$_ .= '\fR';
    }

    $_;
}