arch/common/boot/grub/docs/help2man

   1 #!/usr/bin/perl -w
   2
   3 # Generate a short man page from --help and --version output.
   4 # Copyright © 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   5
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2, or (at your option)
   9 # any later version.
  10
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software Foundation,
  18 # Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19
  20 # Written by Brendan O'Dea <bod@compusol.com.au>
  21 # Available from ftp://ftp.gnu.org/gnu/help2man/
  22
  23 use 5.004;
  24 use strict;
  25 use Getopt::Long;
  26 use Text::Tabs qw(expand);
  27 use POSIX qw(strftime setlocale LC_TIME);
  28
  29 my $this_program = 'help2man';
  30 my $this_version = '1.23';
  31 my $version_info = <<EOT;
  32 GNU $this_program $this_version
  33
  34 Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
  35 This is free software; see the source for copying conditions.  There is NO
  36 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  37
  38 Written by Brendan O'Dea <bod\@compusol.com.au>
  39 EOT
  40
  41 my $help_info = <<EOT;
  42 `$this_program' generates a man page out of `--help' and `--version' output.
  43
  44 Usage: $this_program [OPTION]... EXECUTABLE
  45
  46  -n, --name=STRING       use `STRING' as the description for the NAME paragraph
  47  -s, --section=SECTION   use `SECTION' as the section for the man page
  48  -i, --include=FILE      include material from `FILE'
  49  -I, --opt-include=FILE  include material from `FILE' if it exists
  50  -o, --output=FILE       send output to `FILE'
  51  -N, --no-info           suppress pointer to Texinfo manual
  52      --help              print this help, then exit
  53      --version           print version number, then exit
  54
  55 EXECUTABLE should accept `--help' and `--version' options.
  56
  57 Report bugs to <bug-help2man\@gnu.org>.
  58 EOT
  59
  60 my $section = 1;
  61 my ($opt_name, @opt_include, $opt_output, $opt_no_info);
  62
  63 # Parse options.
  64 Getopt::Long::config('bundling');
  65 GetOptions (
  66     'n|name=s'          => \$opt_name,
  67     's|section=s'       => \$section,
  68     'i|include=s'       => sub { push @opt_include, [ pop, 1 ] },
  69     'I|opt-include=s'   => sub { push @opt_include, [ pop, 0 ] },
  70     'o|output=s'        => \$opt_output,
  71     'N|no-info'         => \$opt_no_info,
  72     help                => sub { print $help_info; exit },
  73     version             => sub { print $version_info; exit },
  74 ) or die $help_info;
  75
  76 die $help_info unless @ARGV == 1;
  77
  78 my %include = ();
  79 my %append = ();
  80 my @include = (); # retain order given in include file
  81
  82 # Provide replacement `quote-regex' operator for pre-5.005.
  83 BEGIN { eval q(sub qr { '' =~ $_[0]; $_[0] }) if $] < 5.005 }
  84
  85 # Process include file (if given).  Format is:
  86 #
  87 #   [section name]
  88 #   verbatim text
  89 #
  90 # or
  91 #
  92 #   /pattern/
  93 #   verbatim text
  94 #
  95
  96 for (@opt_include)
  97 {
  98     my ($inc, $required) = @$_;
  99
 100     next unless -f $inc or $required;
 101     die "$this_program: can't open `$inc' ($!)\n"
 102         unless open INC, $inc;
 103
 104     my $key;
 105     my $hash = \%include;
 106
 107     while (<INC>)
 108     {
 109         # [section]
 110         if (/^\[([^]]+)\]/)
 111         {
 112             $key = uc $1;
 113             $key =~ s/^\s+//;
 114             $key =~ s/\s+$//;
 115             $hash = \%include;
 116             push @include, $key unless $include{$key};
 117             next;
 118         }
 119
 120         # /pattern/
 121         if (m!^/(.*)/([ims]*)!)
 122         {
 123             my $pat = $2 ? "(?$2)$1" : $1;
 124
 125             # Check pattern.
 126             eval { $key = qr($pat) };
 127             if ($@)
 128             {
 129                 $@ =~ s/ at .*? line \d.*//;
 130                 die "$inc:$.:$@";
 131             }
 132
 133             $hash = \%append;
 134             next;
 135         }
 136
 137         # Silently ignore anything before the first
 138         # section--allows for comments and revision info.
 139         next unless $key;
 140
 141         $hash->{$key} ||= '';
 142         $hash->{$key} .= $_;
 143     }
 144
 145     close INC;
 146
 147     die "$this_program: no valid information found in `$inc'\n"
 148         unless $key;
 149 }
 150
 151 # Compress trailing blank lines.
 152 for my $hash (\(%include, %append))
 153 {
 154     for (keys %$hash) { $hash->{$_} =~ s/\n+$/\n/ }
 155 }
 156
 157 # Turn off localisation of executable's ouput.
 158 @ENV{qw(LANGUAGE LANG LC_ALL)} = ('C') x 3;
 159
 160 # Turn off localisation of date (for strftime).
 161 setlocale LC_TIME, 'C';
 162
 163 # Grab help and version info from executable.
 164 my ($help_text, $version_text) = map {
 165     join '', map { s/ +$//; expand $_ } `$ARGV[0] --$_ 2>/dev/null`
 166         or die "$this_program: can't get `--$_' info from $ARGV[0]\n"
 167 } qw(help version);
 168
 169 my $date = strftime "%B %Y", localtime;
 170 (my $program = $ARGV[0]) =~ s!.*/!!;
 171 my $package = $program;
 172 my $version;
 173
 174 if ($opt_output)
 175 {
 176     unlink $opt_output
 177         or die "$this_program: can't unlink $opt_output ($!)\n"
 178         if -e $opt_output;
 179
 180     open STDOUT, ">$opt_output"
 181         or die "$this_program: can't create $opt_output ($!)\n";
 182 }
 183
 184 # The first line of the --version information is assumed to be in one
 185 # of the following formats:
 186 #
 187 #   <version>
 188 #   <program> <version>
 189 #   {GNU,Free} <program> <version>
 190 #   <program> ({GNU,Free} <package>) <version>
 191 #   <program> - {GNU,Free} <package> <version>
 192 #
 193 # and seperated from any copyright/author details by a blank line.
 194
 195 ($_, $version_text) = split /\n+/, $version_text, 2;
 196
 197 if (/^(\S+) +\(((?:GNU|Free) +[^)]+)\) +(.*)/ or
 198     /^(\S+) +- *((?:GNU|Free) +\S+) +(.*)/)
 199 {
 200     $program = $1;
 201     $package = $2;
 202     $version = $3;
 203 }
 204 elsif (/^((?:GNU|Free) +)?(\S+) +(.*)/)
 205 {
 206     $program = $2;
 207     $package = $1 ? "$1$2" : $2;
 208     $version = $3;
 209 }
 210 else
 211 {
 212     $version = $_;
 213 }
 214
 215 $program =~ s!.*/!!;
 216
 217 # No info for `info' itself.
 218 $opt_no_info = 1 if $program eq 'info';
 219
 220 # --name overrides --include contents.
 221 $include{NAME} = "$program \\- $opt_name\n" if $opt_name;
 222
 223 # Default (useless) NAME paragraph.
 224 $include{NAME} ||= "$program \\- manual page for $program $version\n";
 225
 226 # Man pages traditionally have the page title in caps.
 227 my $PROGRAM = uc $program;
 228
 229 # Extract usage clause(s) [if any] for SYNOPSIS.
 230 if ($help_text =~ s/^Usage:( +(\S+))(.*)((?:\n(?: {6}\1| *or: +\S).*)*)//m)
 231 {
 232     my @syn = $2 . $3;
 233
 234     if ($_ = $4)
 235     {
 236         s/^\n//;
 237         for (split /\n/) { s/^ *(or: +)?//; push @syn, $_ }
 238     }
 239
 240     my $synopsis = '';
 241     for (@syn)
 242     {
 243         $synopsis .= ".br\n" if $synopsis;
 244         s!^\S*/!!;
 245         s/^(\S+) *//;
 246         $synopsis .= ".B $1\n";
 247         s/\s+$//;
 248         s/(([][]|\.\.+)+)/\\fR$1\\fI/g;
 249         s/^/\\fI/ unless s/^\\fR//;
 250         $_ .= '\fR';
 251         s/(\\fI)( *)/$2$1/g;
 252         s/\\fI\\fR//g;
 253         s/^\\fR//;
 254         s/\\fI$//;
 255         s/^\./\\&./;
 256
 257         $synopsis .= "$_\n";
 258     }
 259
 260     $include{SYNOPSIS} ||= $synopsis;
 261 }
 262
 263 # Process text, initial section is DESCRIPTION.
 264 my $sect = 'DESCRIPTION';
 265 $_ = "$help_text\n\n$version_text";
 266
 267 # Normalise paragraph breaks.
 268 s/^\n+//;
 269 s/\n*$/\n/;
 270 s/\n\n+/\n\n/g;
 271
 272 # Temporarily exchange leading dots, apostrophes and backslashes for
 273 # tokens.
 274 s/^\./\x80/mg;
 275 s/^'/\x81/mg;
 276 s/\\/\x82/g;
 277
 278 # Start a new paragraph (if required) for these.
 279 s/([^\n])\n(Report +bugs|Email +bug +reports +to|Written +by)/$1\n\n$2/g;
 280
 281 sub convert_option;
 282
 283 while (length)
 284 {
 285     # Convert some standard paragraph names.
 286     if (s/^(Options|Examples): *\n//)
 287     {
 288         $sect = uc $1;
 289         next;
 290     }
 291
 292     # Copyright section
 293     if (/^Copyright +[(\xa9]/)
 294     {
 295         $sect = 'COPYRIGHT';
 296         $include{$sect} ||= '';
 297         $include{$sect} .= ".PP\n" if $include{$sect};
 298
 299         my $copy;
 300         ($copy, $_) = split /\n\n/, $_, 2;
 301
 302         for ($copy)
 303         {
 304             # Add back newline
 305             s/\n*$/\n/;
 306
 307             # Convert iso9959-1 copyright symbol or (c) to nroff
 308             # character.
 309             s/^Copyright +(?:\xa9|\([Cc]\))/Copyright \\(co/mg;
 310
 311             # Insert line breaks before additional copyright messages
 312             # and the disclaimer.
 313             s/(.)\n(Copyright |This +is +free +software)/$1\n.br\n$2/g;
 314
 315             # Join hyphenated lines.
 316             s/([A-Za-z])-\n */$1/g;
 317         }
 318
 319         $include{$sect} .= $copy;
 320         $_ ||= '';
 321         next;
 322     }
 323
 324     # Catch bug report text.
 325     if (/^(Report +bugs|Email +bug +reports +to) /)
 326     {
 327         $sect = 'REPORTING BUGS';
 328     }
 329
 330     # Author section.
 331     elsif (/^Written +by/)
 332     {
 333         $sect = 'AUTHOR';
 334     }
 335
 336     # Examples, indicated by an indented leading $, % or > are
 337     # rendered in a constant width font.
 338     if (/^( +)([\$\%>] )\S/)
 339     {
 340         my $indent = $1;
 341         my $prefix = $2;
 342         my $break = '.IP';
 343         $include{$sect} ||= '';
 344         while (s/^$indent\Q$prefix\E(\S.*)\n*//)
 345         {
 346             $include{$sect} .= "$break\n\\f(CW$prefix$1\\fR\n";
 347             $break = '.br';
 348         }
 349
 350         next;
 351     }
 352
 353     my $matched = '';
 354     $include{$sect} ||= '';
 355
 356     # Sub-sections have a trailing colon and the second line indented.
 357     if (s/^(\S.*:) *\n / /)
 358     {
 359         $matched .= $& if %append;
 360         $include{$sect} .= qq(.SS "$1"\n);
 361     }
 362
 363     my $indent = 0;
 364     my $content = '';
 365
 366     # Option with description.
 367     if (s/^( {1,10}([+-]\S.*?))(?:(  +)|\n( {20,}))(\S.*)\n//)
 368     {
 369         $matched .= $& if %append;
 370         $indent = length ($4 || "$1$3");
 371         $content = ".TP\n\x83$2\n\x83$5\n";
 372         unless ($4)
 373         {
 374             # Indent may be different on second line.
 375             $indent = length $& if /^ {20,}/;
 376         }
 377     }
 378
 379     # Option without description.
 380     elsif (s/^ {1,10}([+-]\S.*)\n//)
 381     {
 382         $matched .= $& if %append;
 383         $content = ".HP\n\x83$1\n";
 384         $indent = 80; # not continued
 385     }
 386
 387     # Indented paragraph with tag.
 388     elsif (s/^( +(\S.*?)  +)(\S.*)\n//)
 389     {
 390         $matched .= $& if %append;
 391         $indent = length $1;
 392         $content = ".TP\n\x83$2\n\x83$3\n";
 393     }
 394
 395     # Indented paragraph.
 396     elsif (s/^( +)(\S.*)\n//)
 397     {
 398         $matched .= $& if %append;
 399         $indent = length $1;
 400         $content = ".IP\n\x83$2\n";
 401     }
 402
 403     # Left justified paragraph.
 404     else
 405     {
 406         s/(.*)\n//;
 407         $matched .= $& if %append;
 408         $content = ".PP\n" if $include{$sect};
 409         $content .= "$1\n";
 410     }
 411
 412     # Append continuations.
 413     while (s/^ {$indent}(\S.*)\n//)
 414     {
 415         $matched .= $& if %append;
 416         $content .= "\x83$1\n"
 417     }
 418
 419     # Move to next paragraph.
 420     s/^\n+//;
 421
 422     for ($content)
 423     {
 424         # Leading dot and apostrophe protection.
 425         s/\x83\./\x80/g;
 426         s/\x83'/\x81/g;
 427         s/\x83//g;
 428
 429         # Convert options.
 430         s/(^| )(-[][\w=-]+)/$1 . convert_option $2/mge;
 431     }
 432
 433     # Check if matched paragraph contains /pat/.
 434     if (%append)
 435     {
 436         for my $pat (keys %append)
 437         {
 438             if ($matched =~ $pat)
 439             {
 440                 $content .= ".PP\n" unless $append{$pat} =~ /^\./;
 441                 $content .= $append{$pat};
 442             }
 443         }
 444     }
 445
 446     $include{$sect} .= $content;
 447 }
 448
 449 # Refer to the real documentation.
 450 unless ($opt_no_info)
 451 {
 452     $sect = 'SEE ALSO';
 453     $include{$sect} ||= '';
 454     $include{$sect} .= ".PP\n" if $include{$sect};
 455     $include{$sect} .= <<EOT;
 456 The full documentation for
 457 .B $program
 458 is maintained as a Texinfo manual.  If the
 459 .B info
 460 and
 461 .B $program
 462 programs are properly installed at your site, the command
 463 .IP
 464 .B info $program
 465 .PP
 466 should give you access to the complete manual.
 467 EOT
 468 }
 469
 470 # Output header.
 471 print <<EOT;
 472 .\\" DO NOT MODIFY THIS FILE!  It was generated by $this_program $this_version.
 473 .TH $PROGRAM "$section" "$date" "$package $version" FSF
 474 EOT
 475
 476 # Section ordering.
 477 my @pre = qw(NAME SYNOPSIS DESCRIPTION OPTIONS EXAMPLES);
 478 my @post = ('AUTHOR', 'REPORTING BUGS', 'COPYRIGHT', 'SEE ALSO');
 479 my $filter = join '|', @pre, @post;
 480
 481 # Output content.
 482 for (@pre, (grep ! /^($filter)$/o, @include), @post)
 483 {
 484     if ($include{$_})
 485     {
 486         my $quote = /\W/ ? '"' : '';
 487         print ".SH $quote$_$quote\n";
 488
 489         for ($include{$_})
 490         {
 491             # Replace leading dot, apostrophe and backslash tokens.
 492             s/\x80/\\&./g;
 493             s/\x81/\\&'/g;
 494             s/\x82/\\e/g;
 495             print;
 496         }
 497     }
 498 }
 499
 500 exit;
 501
 502 # Convert option dashes to \- to stop nroff from hyphenating 'em, and
 503 # embolden.  Option arguments get italicised.
 504 sub convert_option
 505 {
 506     local $_ = '\fB' . shift;
 507
 508     s/-/\\-/g;
 509     unless (s/\[=(.*)\]$/\\fR[=\\fI$1\\fR]/)
 510     {
 511         s/=(.)/\\fR=\\fI$1/;
 512         s/ (.)/ \\fI$1/;
 513         $_ .= '\fR';
 514     }
 515
 516     $_;
 517 }