tools/help2man.pl - R - Git at Google

 # Generate a short man page from --help and --version output.
 # Copyright © 1997, 98, 99 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  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 = '1.020';
 my $version_info = <<EOT;
 $this_program $this_version

 Copyright (C) 1997, 98, 99 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.
 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;
     $version =~ s/^version //g;	# FL
     $version =~ s/ .*//g;	# KH
 }
 elsif (/^((?:GNU|Free) +)?(\S+) +(.*)/)
 {
     $program = $2;
     $package = $1 ? "$1$2" : $2;
     $version = $3;
     $version =~ s/^version //g;	# FL
     $version =~ s/ .*//g;	# KH
 }
 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 and backslashes for tokens.
 s/^\./\x80/mg;
 s/\\/\x81/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\x82$2\n\x82$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\x82$1\n";
 	$indent = 80; # not continued
     }

     # Indented paragraph with tag.
     elsif (s/^( +(\S.*?)  +)(\S.*)\n//)
     {
 	$matched .= $& if %append;
 	$indent = length $1;
 	$content = ".TP\n\x82$2\n\x82$3\n";
     }

     # Indented paragraph.
     elsif (s/^( +)(\S.*)\n//)
     {
 	$matched .= $& if %append;
 	$indent = length $1;
 	$content = ".IP\n\x82$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 .= "\x82$1\n"
     }

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

     for ($content)
     {
 	# Leading dot protection.
 	s/\x82\./\x80/g;
 	s/\x82//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 an backslash tokens.
 	    s/\x80/\\&./g;
 	    s/\x81/\\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';
     }

     $_;
 }
	# Generate a short man page from --help and --version output.
	# Copyright © 1997, 98, 99 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 = '1.020';
	my $version_info = <<EOT;
	$this_program $this_version

	Copyright (C) 1997, 98, 99 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.
	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;
	$version =~ s/^version //g; # FL
	$version =~ s/ .*//g; # KH
	}
	elsif (/^((?:GNU\|Free) +)?(\S+) +(.*)/)
	{
	$program = $2;
	$package = $1 ? "$1$2" : $2;
	$version = $3;
	$version =~ s/^version //g; # FL
	$version =~ s/ .*//g; # KH
	}
	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 and backslashes for tokens.
	s/^\./\x80/mg;
	s/\\/\x81/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\x82$2\n\x82$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\x82$1\n";
	$indent = 80; # not continued
	}

	# Indented paragraph with tag.
	elsif (s/^( +(\S.?) +)(\S.)\n//)
	{
	$matched .= $& if %append;
	$indent = length $1;
	$content = ".TP\n\x82$2\n\x82$3\n";
	}

	# Indented paragraph.
	elsif (s/^( +)(\S.*)\n//)
	{
	$matched .= $& if %append;
	$indent = length $1;
	$content = ".IP\n\x82$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 .= "\x82$1\n"
	}

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

	for ($content)
	{
	# Leading dot protection.
	s/\x82\./\x80/g;
	s/\x82//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 an backslash tokens.
	s/\x80/\\&./g;
	s/\x81/\\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';
	}

	$_;
	}