buildscripts/help2man.pl

   1 #!@PERL@ -w
   2
   3 # Generate a short man page from --help and --version output.
   4 # Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Free Software
   5 # Foundation, Inc.
   6
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2, or (at your option)
  10 # any later version.
  11
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program; if not, write to the Free Software Foundation,
  19 # Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20
  21 # Written by Brendan O'Dea <bod@debian.org>
  22 # Available from ftp://ftp.gnu.org/gnu/help2man/
  23
  24 use 5.005;
  25 use strict;
  26 use Getopt::Long;
  27 use Text::Tabs qw(expand);
  28 use POSIX qw(strftime setlocale LC_TIME);
  29
  30 my $this_program = 'help2man';
  31 my $this_version = '1.28';
  32 my $version_info = <<EOT;
  33 GNU $this_program $this_version
  34
  35 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
  36 This is free software; see the source for copying conditions.  There is NO
  37 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  38
  39 Written by Brendan O'Dea <bod\@debian.org>
  40 EOT
  41
  42 my $help_info = <<EOT;
  43 `$this_program' generates a man page out of `--help' and `--version' output.
  44
  45 Usage: $this_program [OPTIONS]... EXECUTABLE
  46
  47  -n, --name=STRING       description for the NAME paragraph
  48  -s, --section=SECTION   section number for manual page (1, 6, 8)
  49  -m, --manual=TEXT       name of manual (User Commands, ...)
  50  -S, --source=TEXT       source of program (FSF, Debian, ...)
  51  -i, --include=FILE      include material from `FILE'
  52  -I, --opt-include=FILE  include material from `FILE' if it exists
  53  -o, --output=FILE       send output to `FILE'
  54  -p, --info-page=TEXT    name of Texinfo manual
  55  -N, --no-info           suppress pointer to Texinfo manual
  56      --help              print this help, then exit
  57      --version           print version number, then exit
  58
  59 EXECUTABLE should accept `--help' and `--version' options although
  60 alternatives may be specified using:
  61
  62  -h, --help-option=STRING     help option string
  63  -v, --version-option=STRING  version option string
  64
  65 Report bugs to <bug-help2man\@gnu.org>.
  66 EOT
  67
  68 my $section = 1;
  69 my $manual = '';
  70 my $source = '';
  71 my $help_option = '--help';
  72 my $version_option = '--version';
  73 my ($opt_name, @opt_include, $opt_output, $opt_info, $opt_no_info);
  74
  75 my %opt_def = (
  76     'n|name=s'           => \$opt_name,
  77     's|section=s'        => \$section,
  78     'm|manual=s'         => \$manual,
  79     'S|source=s'         => \$source,
  80     'i|include=s'        => sub { push @opt_include, [ pop, 1 ] },
  81     'I|opt-include=s'    => sub { push @opt_include, [ pop, 0 ] },
  82     'o|output=s'         => \$opt_output,
  83     'p|info-page=s'      => \$opt_info,
  84     'N|no-info'          => \$opt_no_info,
  85     'h|help-option=s'    => \$help_option,
  86     'v|version-option=s' => \$version_option,
  87 );
  88
  89 # Parse options.
  90 Getopt::Long::config('bundling');
  91 GetOptions (%opt_def,
  92     help    => sub { print $help_info; exit },
  93     version => sub { print $version_info; exit },
  94 ) or die $help_info;
  95
  96 die $help_info unless @ARGV == 1;
  97
  98 my %include = ();
  99 my %append = ();
 100 my @include = (); # retain order given in include file
 101
 102 # Process include file (if given).  Format is:
 103 #
 104 #   [section name]
 105 #   verbatim text
 106 #
 107 # or
 108 #
 109 #   /pattern/
 110 #   verbatim text
 111 #
 112
 113 while (@opt_include)
 114 {
 115     my ($inc, $required) = @{shift @opt_include};
 116
 117     next unless -f $inc or $required;
 118     die "$this_program: can't open `$inc' ($!)\n"
 119         unless open INC, $inc;
 120
 121     my $key;
 122     my $hash = \%include;
 123
 124     while (<INC>)
 125     {
 126         # [section]
 127         if (/^\[([^]]+)\]/)
 128         {
 129             $key = uc $1;
 130             $key =~ s/^\s+//;
 131             $key =~ s/\s+$//;
 132             $hash = \%include;
 133             push @include, $key unless $include{$key};
 134             next;
 135         }
 136
 137         # /pattern/
 138         if (m!^/(.*)/([ims]*)!)
 139         {
 140             my $pat = $2 ? "(?$2)$1" : $1;
 141
 142             # Check pattern.
 143             eval { $key = qr($pat) };
 144             if ($@)
 145             {
 146                 $@ =~ s/ at .*? line \d.*//;
 147                 die "$inc:$.:$@";
 148             }
 149
 150             $hash = \%append;
 151             next;
 152         }
 153
 154         # Check for options before the first section--anything else is
 155         # silently ignored, allowing the first for comments and
 156         # revision info.
 157         unless ($key)
 158         {
 159             # handle options
 160             if (/^-/)
 161             {
 162                 local @ARGV = split;
 163                 GetOptions %opt_def;
 164             }
 165
 166             next;
 167         }
 168
 169         $hash->{$key} ||= '';
 170         $hash->{$key} .= $_;
 171     }
 172
 173     close INC;
 174
 175     die "$this_program: no valid information found in `$inc'\n"
 176         unless $key;
 177 }
 178
 179 # Compress trailing blank lines.
 180 for my $hash (\(%include, %append))
 181 {
 182     for (keys %$hash) { $hash->{$_} =~ s/\n+$/\n/ }
 183 }
 184
 185 # Turn off localisation of executable's output.
 186 @ENV{qw(LANGUAGE LANG LC_ALL)} = ('C') x 3;
 187
 188 # Turn off localisation of date (for strftime).
 189 setlocale LC_TIME, 'C';
 190
 191 # Grab help and version info from executable.
 192 my ($help_text, $version_text) = map {
 193     join '', map { s/ +$//; expand $_ } `$ARGV[0] $_ 2>/dev/null`
 194         or die "$this_program: can't get `$_' info from $ARGV[0]\n"
 195 } $help_option, $version_option;
 196
 197 my $date = strftime "%B %Y", localtime;
 198 (my $program = $ARGV[0]) =~ s!.*/!!;
 199 my $package = $program;
 200 my $version;
 201
 202 if ($opt_output)
 203 {
 204     unlink $opt_output
 205         or die "$this_program: can't unlink $opt_output ($!)\n"
 206         if -e $opt_output;
 207
 208     open STDOUT, ">$opt_output"
 209         or die "$this_program: can't create $opt_output ($!)\n";
 210 }
 211
 212 # The first line of the --version information is assumed to be in one
 213 # of the following formats:
 214 #
 215 #   <version>
 216 #   <program> <version>
 217 #   {GNU,Free} <program> <version>
 218 #   <program> ({GNU,Free} <package>) <version>
 219 #   <program> - {GNU,Free} <package> <version>
 220 #
 221 # and seperated from any copyright/author details by a blank line.
 222
 223 ($_, $version_text) = split /\n+/, $version_text, 2;
 224
 225 if (/^(\S+) +\(((?:GNU|Free) +[^)]+)\) +(.*)/ or
 226     /^(\S+) +- *((?:GNU|Free) +\S+) +(.*)/)
 227 {
 228     $program = $1;
 229     $package = $2;
 230     $version = $3;
 231 }
 232 elsif (/^((?:GNU|Free) +)?(\S+) +(.*)/)
 233 {
 234     $program = $2;
 235     $package = $1 ? "$1$2" : $2;
 236     $version = $3;
 237 }
 238 else
 239 {
 240     $version = $_;
 241 }
 242
 243 $program =~ s!.*/!!;
 244
 245 # No info for `info' itself.
 246 $opt_no_info = 1 if $program eq 'info';
 247
 248 # --name overrides --include contents.
 249 $include{NAME} = "$program \\- $opt_name\n" if $opt_name;
 250
 251 # Default (useless) NAME paragraph.
 252 $include{NAME} ||= "$program \\- manual page for $program $version\n";
 253
 254 # Man pages traditionally have the page title in caps.
 255 my $PROGRAM = uc $program;
 256
 257 # Set default page head/footers
 258 $source ||= "$program $version";
 259 unless ($manual)
 260 {
 261     for ($section)
 262     {
 263         if (/^(1[Mm]|8)/) { $manual = 'System Administration Utilities' }
 264         elsif (/^6/)      { $manual = 'Games' }
 265         else              { $manual = 'User Commands' }
 266     }
 267 }
 268
 269 # Extract usage clause(s) [if any] for SYNOPSIS.
 270 if ($help_text =~ s/^Usage:( +(\S+))(.*)((?:\n(?: {6}\1| *or: +\S).*)*)//m)
 271 {
 272     my @syn = $2 . $3;
 273
 274     if ($_ = $4)
 275     {
 276         s/^\n//;
 277         for (split /\n/) { s/^ *(or: +)?//; push @syn, $_ }
 278     }
 279
 280     my $synopsis = '';
 281     for (@syn)
 282     {
 283         $synopsis .= ".br\n" if $synopsis;
 284         s!^\S*/!!;
 285         s/^(\S+) *//;
 286         $synopsis .= ".B $1\n";
 287         s/\s+$//;
 288         s/(([][]|\.\.+)+)/\\fR$1\\fI/g;
 289         s/^/\\fI/ unless s/^\\fR//;
 290         $_ .= '\fR';
 291         s/(\\fI)( *)/$2$1/g;
 292         s/\\fI\\fR//g;
 293         s/^\\fR//;
 294         s/\\fI$//;
 295         s/^\./\\&./;
 296
 297         $synopsis .= "$_\n";
 298     }
 299
 300     $include{SYNOPSIS} ||= $synopsis;
 301 }
 302
 303 # Process text, initial section is DESCRIPTION.
 304 my $sect = 'DESCRIPTION';
 305 $_ = "$help_text\n\n$version_text";
 306
 307 # Normalise paragraph breaks.
 308 s/^\n+//;
 309 s/\n*$/\n/;
 310 s/\n\n+/\n\n/g;
 311
 312 # Temporarily exchange leading dots, apostrophes and backslashes for
 313 # tokens.
 314 s/^\./\x80/mg;
 315 s/^'/\x81/mg;
 316 s/\\/\x82/g;
 317
 318 # Start a new paragraph (if required) for these.
 319 s/([^\n])\n(Report +bugs|Email +bug +reports +to|Written +by)/$1\n\n$2/g;
 320
 321 sub convert_option;
 322
 323 while (length)
 324 {
 325     # Convert some standard paragraph names.
 326     if (s/^(Options|Examples): *\n//)
 327     {
 328         $sect = uc $1;
 329         next;
 330     }
 331
 332     # Copyright section
 333     if (/^Copyright +[(\xa9]/)
 334     {
 335         $sect = 'COPYRIGHT';
 336         $include{$sect} ||= '';
 337         $include{$sect} .= ".PP\n" if $include{$sect};
 338
 339         my $copy;
 340         ($copy, $_) = split /\n\n/, $_, 2;
 341
 342         for ($copy)
 343         {
 344             # Add back newline
 345             s/\n*$/\n/;
 346
 347             # Convert iso9959-1 copyright symbol or (c) to nroff
 348             # character.
 349             s/^Copyright +(?:\xa9|\([Cc]\))/Copyright \\(co/mg;
 350
 351             # Insert line breaks before additional copyright messages
 352             # and the disclaimer.
 353             s/(.)\n(Copyright |This +is +free +software)/$1\n.br\n$2/g;
 354
 355             # Join hyphenated lines.
 356             s/([A-Za-z])-\n */$1/g;
 357         }
 358
 359         $include{$sect} .= $copy;
 360         $_ ||= '';
 361         next;
 362     }
 363
 364     # Catch bug report text.
 365     if (/^(Report +bugs|Email +bug +reports +to) /)
 366     {
 367         $sect = 'REPORTING BUGS';
 368     }
 369
 370     # Author section.
 371     elsif (/^Written +by/)
 372     {
 373         $sect = 'AUTHOR';
 374     }
 375
 376     # Examples, indicated by an indented leading $, % or > are
 377     # rendered in a constant width font.
 378     if (/^( +)([\$\%>] )\S/)
 379     {
 380         my $indent = $1;
 381         my $prefix = $2;
 382         my $break = '.IP';
 383         $include{$sect} ||= '';
 384         while (s/^$indent\Q$prefix\E(\S.*)\n*//)
 385         {
 386             $include{$sect} .= "$break\n\\f(CW$prefix$1\\fR\n";
 387             $break = '.br';
 388         }
 389
 390         next;
 391     }
 392
 393     my $matched = '';
 394     $include{$sect} ||= '';
 395
 396     # Sub-sections have a trailing colon and the second line indented.
 397     if (s/^(\S.*:) *\n / /)
 398     {
 399         $matched .= $& if %append;
 400         $include{$sect} .= qq(.SS "$1"\n);
 401     }
 402
 403     my $indent = 0;
 404     my $content = '';
 405
 406     # Option with description.
 407     if (s/^( {1,10}([+-]\S.*?))(?:(  +(?!-))|\n( {20,}))(\S.*)\n//)
 408     {
 409         $matched .= $& if %append;
 410         $indent = length ($4 || "$1$3");
 411         $content = ".TP\n\x83$2\n\x83$5\n";
 412         unless ($4)
 413         {
 414             # Indent may be different on second line.
 415             $indent = length $& if /^ {20,}/;
 416         }
 417     }
 418
 419     # Option without description.
 420     elsif (s/^ {1,10}([+-]\S.*)\n//)
 421     {
 422         $matched .= $& if %append;
 423         $content = ".HP\n\x83$1\n";
 424         $indent = 80; # not continued
 425     }
 426
 427     # Indented paragraph with tag.
 428     elsif (s/^( +(\S.*?)  +)(\S.*)\n//)
 429     {
 430         $matched .= $& if %append;
 431         $indent = length $1;
 432         $content = ".TP\n\x83$2\n\x83$3\n";
 433     }
 434
 435     # Indented paragraph.
 436     elsif (s/^( +)(\S.*)\n//)
 437     {
 438         $matched .= $& if %append;
 439         $indent = length $1;
 440         $content = ".IP\n\x83$2\n";
 441     }
 442
 443     # Left justified paragraph.
 444     else
 445     {
 446         s/(.*)\n//;
 447         $matched .= $& if %append;
 448         $content = ".PP\n" if $include{$sect};
 449         $content .= "$1\n";
 450     }
 451
 452     # Append continuations.
 453     while (s/^ {$indent}(\S.*)\n//)
 454     {
 455         $matched .= $& if %append;
 456         $content .= "\x83$1\n"
 457     }
 458
 459     # Move to next paragraph.
 460     s/^\n+//;
 461
 462     for ($content)
 463     {
 464         # Leading dot and apostrophe protection.
 465         s/\x83\./\x80/g;
 466         s/\x83'/\x81/g;
 467         s/\x83//g;
 468
 469         # Convert options.
 470         s/(^| )(-[][\w=-]+)/$1 . convert_option $2/mge;
 471     }
 472
 473     # Check if matched paragraph contains /pat/.
 474     if (%append)
 475     {
 476         for my $pat (keys %append)
 477         {
 478             if ($matched =~ $pat)
 479             {
 480                 $content .= ".PP\n" unless $append{$pat} =~ /^\./;
 481                 $content .= $append{$pat};
 482             }
 483         }
 484     }
 485
 486     $include{$sect} .= $content;
 487 }
 488
 489 # Refer to the real documentation.
 490 unless ($opt_no_info)
 491 {
 492     my $info_page = $opt_info || $program;
 493
 494     $sect = 'SEE ALSO';
 495     $include{$sect} ||= '';
 496     $include{$sect} .= ".PP\n" if $include{$sect};
 497     $include{$sect} .= <<EOT;
 498 The full documentation for
 499 .B $program
 500 is maintained as a Texinfo manual.  If the
 501 .B info
 502 and
 503 .B $program
 504 programs are properly installed at your site, the command
 505 .IP
 506 .B info $info_page
 507 .PP
 508 should give you access to the complete manual.
 509 EOT
 510 }
 511
 512 # Output header.
 513 print <<EOT;
 514 .\\" DO NOT MODIFY THIS FILE!  It was generated by $this_program $this_version.
 515 .TH $PROGRAM "$section" "$date" "$source" "$manual"
 516 EOT
 517
 518 # Section ordering.
 519 my @pre = qw(NAME SYNOPSIS DESCRIPTION OPTIONS EXAMPLES);
 520 my @post = ('AUTHOR', 'REPORTING BUGS', 'COPYRIGHT', 'SEE ALSO');
 521 my $filter = join '|', @pre, @post;
 522
 523 # Output content.
 524 for (@pre, (grep ! /^($filter)$/o, @include), @post)
 525 {
 526     if ($include{$_})
 527     {
 528         my $quote = /\W/ ? '"' : '';
 529         print ".SH $quote$_$quote\n";
 530
 531         for ($include{$_})
 532         {
 533             # Replace leading dot, apostrophe and backslash tokens.
 534             s/\x80/\\&./g;
 535             s/\x81/\\&'/g;
 536             s/\x82/\\e/g;
 537             print;
 538         }
 539     }
 540 }
 541
 542 exit;
 543
 544 # Convert option dashes to \- to stop nroff from hyphenating 'em, and
 545 # embolden.  Option arguments get italicised.
 546 sub convert_option
 547 {
 548     local $_ = '\fB' . shift;
 549
 550     s/-/\\-/g;
 551     unless (s/\[=(.*)\]$/\\fR[=\\fI$1\\fR]/)
 552     {
 553         s/=(.)/\\fR=\\fI$1/;
 554         s/ (.)/ \\fI$1/;
 555         $_ .= '\fR';
 556     }
 557
 558     $_;
 559 }