--- /dev/null
+#! /usr/bin/perl -w
+
+# Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
+
+# This file is part of GNU CC.
+
+# GNU CC 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.
+
+# GNU CC 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 GNU CC; see the file COPYING. If not, write to
+# the Free Software Foundation, 59 Temple Place - Suite 330,
+# Boston MA 02111-1307, USA.
+
+# This does trivial (and I mean _trivial_) conversion of Texinfo
+# markup to Perl POD format. It's intended to be used to extract
+# something suitable for a manpage from a Texinfo document.
+
+$output = 0;
+$skipping = 0;
+%sects = ();
+$section = "";
+@icstack = ();
+@endwstack = ();
+@skstack = ();
+@instack = ();
+$shift = "";
+%defs = ();
+$fnno = 1;
+$inf = "";
+$ibase = "";
+
+while ($_ = shift) {
+ if (/^-D(.*)$/) {
+ if ($1 ne "") {
+ $flag = $1;
+ } else {
+ $flag = shift;
+ }
+ $value = "";
+ ($flag, $value) = ($flag =~ /^([^=]+)(?:=(.+))?/);
+ die "no flag specified for -D\n"
+ unless $flag ne "";
+ die "flags may only contain letters, digits, hyphens, dashes and underscores\n"
+ unless $flag =~ /^[a-zA-Z0-9_-]+$/;
+ $defs{$flag} = $value;
+ } elsif (/^-/) {
+ usage();
+ } else {
+ $in = $_, next unless defined $in;
+ $out = $_, next unless defined $out;
+ usage();
+ }
+}
+
+if (defined $in) {
+ $inf = gensym();
+ open($inf, "<$in") or die "opening \"$in\": $!\n";
+ $ibase = $1 if $in =~ m|^(.+)/[^/]+$|;
+} else {
+ $inf = \*STDIN;
+}
+
+if (defined $out) {
+ open(STDOUT, ">$out") or die "opening \"$out\": $!\n";
+}
+
+while(defined $inf) {
+while(<$inf>) {
+ # Certain commands are discarded without further processing.
+ /^\@(?:
+ [a-z]+index # @*index: useful only in complete manual
+ |need # @need: useful only in printed manual
+ |(?:end\s+)?group # @group .. @end group: ditto
+ |page # @page: ditto
+ |node # @node: useful only in .info file
+ |(?:end\s+)?ifnottex # @ifnottex .. @end ifnottex: use contents
+ )\b/x and next;
+
+ chomp;
+
+ # Look for filename and title markers.
+ /^\@setfilename\s+([^.]+)/ and $fn = $1, next;
+ /^\@settitle\s+([^.]+)/ and $tl = postprocess($1), next;
+
+ # Identify a man title but keep only the one we are interested in.
+ /^\@c\s+man\s+title\s+([A-Za-z0-9-]+)\s+(.+)/ and do {
+ if (exists $defs{$1}) {
+ $fn = $1;
+ $tl = postprocess($2);
+ }
+ next;
+ };
+
+ # Look for blocks surrounded by @c man begin SECTION ... @c man end.
+ # This really oughta be @ifman ... @end ifman and the like, but such
+ # would require rev'ing all other Texinfo translators.
+ /^\@c\s+man\s+begin\s+([A-Z]+)\s+([A-Za-z0-9-]+)/ and do {
+ $output = 1 if exists $defs{$2};
+ $sect = $1;
+ next;
+ };
+ /^\@c\s+man\s+begin\s+([A-Z]+)/ and $sect = $1, $output = 1, next;
+ /^\@c\s+man\s+end/ and do {
+ $sects{$sect} = "" unless exists $sects{$sect};
+ $sects{$sect} .= postprocess($section);
+ $section = "";
+ $output = 0;
+ next;
+ };
+
+ # handle variables
+ /^\@set\s+([a-zA-Z0-9_-]+)\s*(.*)$/ and do {
+ $defs{$1} = $2;
+ next;
+ };
+ /^\@clear\s+([a-zA-Z0-9_-]+)/ and do {
+ delete $defs{$1};
+ next;
+ };
+
+ next unless $output;
+
+ # Discard comments. (Can't do it above, because then we'd never see
+ # @c man lines.)
+ /^\@c\b/ and next;
+
+ # End-block handler goes up here because it needs to operate even
+ # if we are skipping.
+ /^\@end\s+([a-z]+)/ and do {
+ # Ignore @end foo, where foo is not an operation which may
+ # cause us to skip, if we are presently skipping.
+ my $ended = $1;
+ next if $skipping && $ended !~ /^(?:ifset|ifclear|ignore|menu|iftex)$/;
+
+ die "\@end $ended without \@$ended at line $.\n" unless defined $endw;
+ die "\@$endw ended by \@end $ended at line $.\n" unless $ended eq $endw;
+
+ $endw = pop @endwstack;
+
+ if ($ended =~ /^(?:ifset|ifclear|ignore|menu|iftex)$/) {
+ $skipping = pop @skstack;
+ next;
+ } elsif ($ended =~ /^(?:example|smallexample|display)$/) {
+ $shift = "";
+ $_ = ""; # need a paragraph break
+ } elsif ($ended =~ /^(?:itemize|enumerate|[fv]?table)$/) {
+ $_ = "\n=back\n";
+ $ic = pop @icstack;
+ } else {
+ die "unknown command \@end $ended at line $.\n";
+ }
+ };
+
+ # We must handle commands which can cause skipping even while we
+ # are skipping, otherwise we will not process nested conditionals
+ # correctly.
+ /^\@ifset\s+([a-zA-Z0-9_-]+)/ and do {
+ push @endwstack, $endw;
+ push @skstack, $skipping;
+ $endw = "ifset";
+ $skipping = 1 unless exists $defs{$1};
+ next;
+ };
+
+ /^\@ifclear\s+([a-zA-Z0-9_-]+)/ and do {
+ push @endwstack, $endw;
+ push @skstack, $skipping;
+ $endw = "ifclear";
+ $skipping = 1 if exists $defs{$1};
+ next;
+ };
+
+ /^\@(ignore|menu|iftex)\b/ and do {
+ push @endwstack, $endw;
+ push @skstack, $skipping;
+ $endw = $1;
+ $skipping = 1;
+ next;
+ };
+
+ next if $skipping;
+
+ # Character entities. First the ones that can be replaced by raw text
+ # or discarded outright:
+ s/\@copyright\{\}/(c)/g;
+ s/\@dots\{\}/.../g;
+ s/\@enddots\{\}/..../g;
+ s/\@([.!? ])/$1/g;
+ s/\@[:-]//g;
+ s/\@bullet(?:\{\})?/*/g;
+ s/\@TeX\{\}/TeX/g;
+ s/\@pounds\{\}/\#/g;
+ s/\@minus(?:\{\})?/-/g;
+ s/\\,/,/g;
+
+ # Now the ones that have to be replaced by special escapes
+ # (which will be turned back into text by unmunge())
+ s/&/&/g;
+ s/\@\{/{/g;
+ s/\@\}/}/g;
+ s/\@\@/&at;/g;
+
+ # Inside a verbatim block, handle @var specially.
+ if ($shift ne "") {
+ s/\@var\{([^\}]*)\}/<$1>/g;
+ }
+
+ # POD doesn't interpret E<> inside a verbatim block.
+ if ($shift eq "") {
+ s/</</g;
+ s/>/>/g;
+ } else {
+ s/</</g;
+ s/>/>/g;
+ }
+
+ # Single line command handlers.
+
+ /^\@include\s+(.+)$/ and do {
+ push @instack, $inf;
+ $inf = gensym();
+
+ # Try cwd and $ibase.
+ open($inf, "<" . $1)
+ or open($inf, "<" . $ibase . "/" . $1)
+ or die "cannot open $1 or $ibase/$1: $!\n";
+ next;
+ };
+
+ /^\@(?:section|unnumbered|unnumberedsec|center)\s+(.+)$/
+ and $_ = "\n=head2 $1\n";
+ /^\@subsection\s+(.+)$/
+ and $_ = "\n=head3 $1\n";
+
+ # Block command handlers:
+ /^\@itemize\s+(\@[a-z]+|\*|-)/ and do {
+ push @endwstack, $endw;
+ push @icstack, $ic;
+ $ic = $1;
+ $_ = "\n=over 4\n";
+ $endw = "itemize";
+ };
+
+ /^\@enumerate(?:\s+([a-zA-Z0-9]+))?/ and do {
+ push @endwstack, $endw;
+ push @icstack, $ic;
+ if (defined $1) {
+ $ic = $1 . ".";
+ } else {
+ $ic = "1.";
+ }
+ $_ = "\n=over 4\n";
+ $endw = "enumerate";
+ };
+
+ /^\@([fv]?table)\s+(\@[a-z]+)/ and do {
+ push @endwstack, $endw;
+ push @icstack, $ic;
+ $endw = $1;
+ $ic = $2;
+ $ic =~ s/\@(?:samp|strong|key|gcctabopt|option|env)/B/;
+ $ic =~ s/\@(?:code|kbd)/C/;
+ $ic =~ s/\@(?:dfn|var|emph|cite|i)/I/;
+ $ic =~ s/\@(?:file)/F/;
+ $_ = "\n=over 4\n";
+ };
+
+ /^\@((?:small)?example|display)/ and do {
+ push @endwstack, $endw;
+ $endw = $1;
+ $shift = "\t";
+ $_ = ""; # need a paragraph break
+ };
+
+ /^\@itemx?\s*(.+)?$/ and do {
+ if (defined $1) {
+ # Entity escapes prevent munging by the <> processing below.
+# print "$ic\n";
+ $_ = "\n=item $ic\<$1\>\n";
+ } else {
+ $_ = "\n=item $ic\n";
+ $ic =~ y/A-Ya-y/B-Zb-z/;
+ $ic =~ s/(\d+)/$1 + 1/eg;
+ }
+ };
+
+ $section .= $shift.$_."\n";
+}
+# End of current file.
+close($inf);
+$inf = pop @instack;
+}
+
+die "No filename or title\n" unless defined $fn && defined $tl;
+
+$sects{NAME} = "$fn \- $tl\n";
+$sects{FOOTNOTES} .= "=back\n" if exists $sects{FOOTNOTES};
+
+for $sect (qw(NAME SYNOPSIS DESCRIPTION OPTIONS ENVIRONMENT FILES
+ BUGS NOTES FOOTNOTES SEEALSO AUTHOR COPYRIGHT)) {
+ if(exists $sects{$sect}) {
+ $head = $sect;
+ $head =~ s/SEEALSO/SEE ALSO/;
+ print "=head1 $head\n\n";
+ print scalar unmunge ($sects{$sect});
+ print "\n";
+ }
+}
+
+sub usage
+{
+ die "usage: $0 [-D toggle...] [infile [outfile]]\n";
+}
+
+sub postprocess
+{
+ local $_ = $_[0];
+
+ # @value{foo} is replaced by whatever 'foo' is defined as.
+ while (m/(\@value\{([a-zA-Z0-9_-]+)\})/g) {
+ if (! exists $defs{$2}) {
+ print STDERR "Option $2 not defined\n";
+ s/\Q$1\E//;
+ } else {
+ $value = $defs{$2};
+ s/\Q$1\E/$value/;
+ }
+ }
+
+ # Formatting commands.
+ # Temporary escape for @r.
+ s/\@r\{([^\}]*)\}/R<$1>/g;
+ s/\@(?:dfn|var|emph|cite|i)\{([^\}]*)\}/I<$1>/g;
+ s/\@(?:code|kbd)\{([^\}]*)\}/C<$1>/g;
+ s/\@(?:gccoptlist|samp|strong|key|option|env|command|b)\{([^\}]*)\}/B<$1>/g;
+ s/\@sc\{([^\}]*)\}/\U$1/g;
+ s/\@file\{([^\}]*)\}/F<$1>/g;
+ s/\@w\{([^\}]*)\}/S<$1>/g;
+ s/\@(?:dmn|math)\{([^\}]*)\}/$1/g;
+
+ # Cross references are thrown away, as are @noindent and @refill.
+ # (@noindent is impossible in .pod, and @refill is unnecessary.)
+ # @* is also impossible in .pod; we discard it and any newline that
+ # follows it. Similarly, our macro @gol must be discarded.
+
+ s/\(?\@xref\{(?:[^\}]*)\}(?:[^.<]|(?:<[^<>]*>))*\.\)?//g;
+ s/\s+\(\@pxref\{(?:[^\}]*)\}\)//g;
+ s/;\s+\@pxref\{(?:[^\}]*)\}//g;
+ s/\@noindent\s*//g;
+ s/\@refill//g;
+ s/\@gol//g;
+ s/\@\*\s*\n?//g;
+
+ # @uref can take one, two, or three arguments, with different
+ # semantics each time. @url and @email are just like @uref with
+ # one argument, for our purposes.
+ s/\@(?:uref|url|email)\{([^\},]*)\}/<B<$1>>/g;
+ s/\@uref\{([^\},]*),([^\},]*)\}/$2 (C<$1>)/g;
+ s/\@uref\{([^\},]*),([^\},]*),([^\},]*)\}/$3/g;
+
+ # Turn B<blah I<blah> blah> into B<blah> I<blah> B<blah> to
+ # match Texinfo semantics of @emph inside @samp. Also handle @r
+ # inside bold.
+ s/</</g;
+ s/>/>/g;
+ 1 while s/B<((?:[^<>]|I<[^<>]*>)*)R<([^>]*)>/B<$1>${2}B</g;
+ 1 while (s/B<([^<>]*)I<([^>]+)>/B<$1>I<$2>B</g);
+ 1 while (s/I<([^<>]*)B<([^>]+)>/I<$1>B<$2>I</g);
+ s/[BI]<>//g;
+ s/([BI])<(\s+)([^>]+)>/$2$1<$3>/g;
+ s/([BI])<([^>]+?)(\s+)>/$1<$2>$3/g;
+
+ # Extract footnotes. This has to be done after all other
+ # processing because otherwise the regexp will choke on formatting
+ # inside @footnote.
+ while (/\@footnote/g) {
+ s/\@footnote\{([^\}]+)\}/[$fnno]/;
+ add_footnote($1, $fnno);
+ $fnno++;
+ }
+
+ return $_;
+}
+
+sub unmunge
+{
+ # Replace escaped symbols with their equivalents.
+ local $_ = $_[0];
+
+ s/</E<lt>/g;
+ s/>/E<gt>/g;
+ s/{/\{/g;
+ s/}/\}/g;
+ s/&at;/\@/g;
+ s/&/&/g;
+ return $_;
+}
+
+sub add_footnote
+{
+ unless (exists $sects{FOOTNOTES}) {
+ $sects{FOOTNOTES} = "\n=over 4\n\n";
+ }
+
+ $sects{FOOTNOTES} .= "=item $fnno.\n\n"; $fnno++;
+ $sects{FOOTNOTES} .= $_[0];
+ $sects{FOOTNOTES} .= "\n\n";
+}
+
+# stolen from Symbol.pm
+{
+ my $genseq = 0;
+ sub gensym
+ {
+ my $name = "GEN" . $genseq++;
+ my $ref = \*{$name};
+ delete $::{$name};
+ return $ref;
+ }
+}
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