315 lines
6.9 KiB
Perl
315 lines
6.9 KiB
Perl
#! @PERL@
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#
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# Generate a man page from sections of a Texinfo manual.
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#
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# Copyright 2004 The Free Software Foundation,
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# Derek R. Price,
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# & Ximbiot <http://ximbiot.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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# Need Perl 5.005 or greater for re 'eval'.
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require 5.005;
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# The usual.
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use strict;
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use IO::File;
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###
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### GLOBALS
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###
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my $texi_num = 0; # Keep track of how many texinfo files have been encountered.
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my @parent; # This needs to be global to be used inside of a regex later.
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###
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### FUNCTIONS
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###
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sub keyword_mode
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{
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my ($keyword, $file) = @_;
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return "\\fR"
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if $keyword =~ /^(|r|t)$/;
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return "\\fB"
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if $keyword =~ /^(strong|sc|code|file|samp)$/;
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return "\\fI"
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if $keyword =~ /^(emph|var|dfn)$/;
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die "no handler for keyword \`$keyword', found at line $. of file \`$file'\n";
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}
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# Return replacement for \@$keyword{$content}.
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sub do_keyword
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{
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my ($file, $parent, $keyword, $content) = @_;
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return "see node \`$content\\(aq in the CVS manual"
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if $keyword =~ /^(p?x)?ref$/;
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return "\\fP\\fP$content"
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if $keyword =~ /^splitrcskeyword$/;
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my $endmode = keyword_mode $parent;
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my $startmode = keyword_mode $keyword, $file;
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return "$startmode$content$endmode";
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}
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###
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### MAIN
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###
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for my $file (@ARGV)
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{
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my $fh = new IO::File "< $file"
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or die "Failed to open file \`$file': $!";
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if ($file !~ /\.(texinfo|texi|txi)$/)
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{
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print stderr "Passing \`$file' through unprocessed.\n";
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# Just cat any file that doesn't look like a Texinfo source.
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while (my $line = $fh->getline)
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{
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print $line;
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}
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next;
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}
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print stderr "Processing \`$file'.\n";
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$texi_num++;
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my $gotone = 0;
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my $inblank = 0;
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my $indent = 0;
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my $inexample = 0;
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my $inmenu = 0;
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my $intable = 0;
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my $last_header = "";
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my @table_headers;
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my @table_footers;
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my $table_header = "";
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my $table_footer = "";
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my $last;
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while ($_ = $fh->getline)
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{
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if (!$gotone && /^\@c ----- START MAN $texi_num -----$/)
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{
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$gotone = 1;
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next;
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}
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# Skip ahead until our man section.
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next unless $gotone;
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# If we find the end tag we are done.
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last if /^\@c ----- END MAN $texi_num -----$/;
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# Need to do this everywhere. i.e., before we print example
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# lines, since literal back slashes can appear there too.
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s/\\/\\\\/g;
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s/^\./\\&./;
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s/([\s])\./$1\\&./;
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s/'/\\(aq/g;
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s/`/\\`/g;
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s/(?<!-)---(?!-)/\\(em/g;
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s/\@bullet({}|\b)/\\(bu/g;
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s/\@dots({}|\b)/\\&.../g;
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# Examples should be indented and otherwise untouched
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if (/^\@example$/)
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{
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$indent += 2;
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print qq{.SP\n.PD 0\n};
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$inexample = 1;
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next;
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}
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if ($inexample)
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{
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if (/^\@end example$/)
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{
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$indent -= 2;
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print qq{\n.PD\n.IP "" $indent\n};
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$inexample = 0;
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next;
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}
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if (/^[ ]*$/)
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{
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print ".SP\n";
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next;
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}
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# Preserve the newline.
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$_ = qq{.IP "" $indent\n} . $_;
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}
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# Compress blank lines into a single line. This and its
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# corresponding skip purposely bracket the @menu and comment
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# removal so that blanks on either side of a menu are
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# compressed after the menu is removed.
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if (/^[ ]*$/)
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{
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$inblank = 1;
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next;
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}
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# Not used
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if (/^\@(ignore|menu)$/)
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{
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$inmenu++;
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next;
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}
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# Delete menu contents.
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if ($inmenu)
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{
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next unless /^\@end (ignore|menu)$/;
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$inmenu--;
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next;
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}
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# Remove comments
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next if /^\@c(omment)?\b/;
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# It's okay to ignore this keyword - we're not using any
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# first-line indent commands at all.
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next if s/^\@noindent\s*$//;
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# @need is only significant in printed manuals.
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next if s/^\@need\s+.*$//;
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# If we didn't hit the previous check and $inblank is set, then
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# we just finished with some number of blanks. Print the man
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# page blank symbol before continuing processing of this line.
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if ($inblank)
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{
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print ".SP\n";
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$inblank = 0;
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}
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# Chapter headers.
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$last_header = $1 if s/^\@node\s+(.*)$/.SH "$1"/;
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if (/^\@appendix\w*\s+(.*)$/)
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{
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my $content = $1;
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$content =~ s/^$last_header(\\\(em|\s+)?//;
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next if $content =~ /^\s*$/;
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s/^\@appendix\w*\s+.*$/.SS "$content"/;
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}
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# Tables are similar to examples, except we need to handle the
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# keywords.
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if (/^\@(itemize|table)(\s+(.*))?$/)
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{
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$indent += 2;
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push @table_headers, $table_header;
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push @table_footers, $table_footer;
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my $content = $3;
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if (/^\@itemize/)
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{
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my $bullet = $content;
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$table_header = qq{.IP "$bullet" $indent\n};
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$table_footer = "";
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}
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else
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{
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my $hi = $indent - 2;
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$table_header = qq{.IP "" $hi\n};
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$table_footer = qq{\n.IP "" $indent};
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if ($content)
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{
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$table_header .= "$content\{";
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$table_footer = "\}$table_footer";
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}
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}
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$intable++;
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next;
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}
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if ($intable)
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{
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if (/^\@end (itemize|table)$/)
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{
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$table_header = pop @table_headers;
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$table_footer = pop @table_footers;
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$indent -= 2;
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$intable--;
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next;
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}
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s/^\@itemx?(\s+(.*))?$/$table_header$2$table_footer/;
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# Fall through so the rest of the table lines are
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# processed normally.
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}
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# Index entries.
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s/^\@cindex\s+(.*)$/.IX "$1"/;
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$_ = "$last$_" if $last;
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undef $last;
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# Trap keywords
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my $nk = qr/
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\@(\w+)\{
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(?{ push @parent, $1 }) # Keep track of the last keyword
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# keyword we encountered.
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((?:
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(?> (?:[^{}]|(?<=\@)[{}])*) # Non-braces without backtracking
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(??{ $nk }) # Nested keywords
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)*)
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\}
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(?{ pop (@parent) }) # Lose track of the current keyword.
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/x;
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@parent = ("");
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while (s/$nk/do_keyword $file, $parent[$#parent], $1, $2/e)
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{
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# Do nothing except replace our last-replacement
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# tracker - the replacement regex above is handling
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# everything else.
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@parent = ("");
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}
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s/$nk/do_keyword $file, $parent[$#parent], $1, $2/ge;
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if (/\@\w+\{/)
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{
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# If there is still an opening keyword left, we need to
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# find the close bracket. Set $last to append the next
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# line in the next pass.
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$last = $_;
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next;
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}
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# Finally, unprotect texinfo special characters.
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s/\@://g;
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s/\@([{}])/$1/g;
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# Verify we haven't left commands unprocessed.
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die "Unprocessed command at line $. of file \`$file': "
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. ($1 ? "$1\n" : "<EOL>\n")
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if /^(?>(?:[^\@]|\@\@)*)\@(\w+|.|$)/;
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# Unprotect @@.
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s/\@\@/\@/g;
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# And print whatever's left.
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print $_;
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}
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}
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