f4e8dec658
* texi2pod.pl: If multiple @c man sections with the same tag appear, concatenate them in the final output. When skipping, ignore block commands that can't cause skipping, and honor those that can. Ensure that verbatim blocks are separate paragraphs. From-SVN: r38117
326 lines
8.2 KiB
Prolog
Executable File
326 lines
8.2 KiB
Prolog
Executable File
#! /usr/bin/perl -w
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# This does trivial (and I mean _trivial_) conversion of Texinfo
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# markup to Perl POD format. It's intended to be used to extract
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# something suitable for a manpage from a Texinfo document.
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$output = 0;
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$skipping = 0;
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%sects = ();
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$section = "";
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@icstack = ();
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@endwstack = ();
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@skstack = ();
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$shift = "";
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%defs = ();
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$fnno = 1;
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while ($_ = shift) {
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if (/^-D(.*)$/) {
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if ($1 ne "") {
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$flag = $1;
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} else {
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$flag = shift;
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}
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die "no flag specified for -D\n"
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unless $flag ne "";
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die "flags may only contain letters, digits, hyphens, and underscores\n"
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unless $flag =~ /^[a-zA-Z0-9_-]+$/;
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$defs{$flag} = "";
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} elsif (/^-/) {
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usage();
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} else {
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$in = $_, next unless defined $in;
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$out = $_, next unless defined $out;
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usage();
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}
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}
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if (defined $in) {
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open(STDIN, $in) or die "opening \"$in\": $!\n";
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}
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if (defined $out) {
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open(STDOUT, ">$out") or die "opening \"$out\": $!\n";
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}
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while(<STDIN>)
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{
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# Certain commands are discarded without further processing.
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/^\@(?:
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[a-z]+index # @*index: useful only in complete manual
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|need # @need: useful only in printed manual
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|(?:end\s+)?group # @group .. @end group: ditto
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|page # @page: ditto
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|node # @node: useful only in .info file
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)\b/x and next;
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chomp;
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# Look for filename and title markers.
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/^\@setfilename\s+([^.]+)/ and $fn = $1, next;
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/^\@settitle\s+([^.]+)/ and $tl = $1, next;
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# Look for blocks surrounded by @c man begin SECTION ... @c man end.
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# This really oughta be @ifman ... @end ifman and the like, but such
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# would require rev'ing all other Texinfo translators.
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/^\@c man begin ([A-Z]+)/ and $sect = $1, $output = 1, next;
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/^\@c man end/ and do {
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$sects{$sect} = "" unless exists $sects{$sect};
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$sects{$sect} .= postprocess($section);
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$section = "";
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$output = 0;
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next;
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};
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next unless $output;
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# Discard comments. (Can't do it above, because then we'd never see
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# @c man lines.)
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/^\@c\b/ and next;
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# End-block handler goes up here because it needs to operate even
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# if we are skipping.
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/^\@end\s+([a-z]+)/ and do {
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# Ignore @end foo, where foo is not an operation which may
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# cause us to skip, if we are presently skipping.
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my $ended = $1;
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next if $skipping && $ended !~ /^(?:ifset|ifclear|ignore|menu)$/;
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die "\@end $ended without \@$ended at line $.\n" unless defined $endw;
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die "\@$endw ended by \@end $ended at line $.\n" unless $ended eq $endw;
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$endw = pop @endwstack;
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if ($ended =~ /^(?:ifset|ifclear|ignore|menu)$/) {
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$skipping = pop @skstack;
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next;
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} elsif ($ended =~ /^(?:example|smallexample)$/) {
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$shift = "";
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$_ = ""; # need a paragraph break
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} elsif ($ended =~ /^(?:itemize|enumerate|table)$/) {
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$_ = "\n=back\n";
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$ic = pop @icstack;
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} else {
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die "unknown command \@end $ended at line $.\n";
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}
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};
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# We must handle commands which can cause skipping even while we
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# are skipping, otherwise we will not process nested conditionals
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# correctly.
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/^\@ifset\s+([a-zA-Z0-9_-]+)/ and do {
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push @endwstack, $endw;
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push @skstack, $skipping;
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$endw = "ifset";
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$skipping = 1 unless exists $defs{$1};
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next;
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};
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/^\@ifclear\s+([a-zA-Z0-9_-]+)/ and do {
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push @endwstack, $endw;
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push @skstack, $skipping;
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$endw = "ifclear";
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$skipping = 1 if exists $defs{$1};
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next;
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};
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/^\@(ignore|menu)\b/ and do {
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push @endwstack, $endw;
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push @skstack, $skipping;
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$endw = $1;
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$skipping = 1;
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next;
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};
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next if $skipping;
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# Character entities. First the ones that can be replaced by raw text
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# or discarded outright:
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s/\@copyright\{\}/(c)/g;
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s/\@dots\{\}/.../g;
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s/\@enddots\{\}/..../g;
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s/\@([.!? ])/$1/g;
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s/\@[:-]//g;
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s/\@bullet(?:\{\})?/*/g;
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s/\@TeX\{\}/TeX/g;
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s/\@pounds\{\}/\#/g;
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s/\@minus(?:\{\})?/-/g;
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# Now the ones that have to be replaced by special escapes
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# (which will be turned back into text by unmunge())
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s/&/&/g;
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s/\@\{/{/g;
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s/\@\}/}/g;
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s/\@\@/&at;/g;
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# POD doesn't interpret E<> inside a verbatim block.
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if ($shift eq "") {
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s/</</g;
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s/>/>/g;
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} else {
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s/</</g;
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s/>/>/g;
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}
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# Single line command handlers.
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/^\@set\s+([a-zA-Z0-9_-]+)\s*(.*)$/ and $defs{$1} = $2, next;
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/^\@clear\s+([a-zA-Z0-9_-]+)/ and delete $defs{$1}, next;
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/^\@section\s+(.+)$/ and $_ = "\n=head2 $1\n";
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/^\@subsection\s+(.+)$/ and $_ = "\n=head3 $1\n";
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# Block command handlers:
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/^\@itemize\s+(\@[a-z]+|\*|-)/ and do {
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push @endwstack, $endw;
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push @icstack, $ic;
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$ic = $1;
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$_ = "\n=over 4\n";
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$endw = "itemize";
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};
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/^\@enumerate(?:\s+([A-Z0-9]+))?/ and do {
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push @endwstack, $endw;
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push @icstack, $ic;
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if (defined $1) {
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$ic = $1 . ".";
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} else {
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$ic = "1.";
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}
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$_ = "\n=over 4\n";
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$endw = "enumerate";
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};
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/^\@table\s+(\@[a-z]+)/ and do {
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push @endwstack, $endw;
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push @icstack, $ic;
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$ic = $1;
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$ic =~ s/\@(?:samp|strong|key)/B/;
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$ic =~ s/\@(?:code|kbd)/C/;
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$ic =~ s/\@(?:dfn|var|emph|cite|i)/I/;
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$ic =~ s/\@(?:file)/F/;
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$_ = "\n=over 4\n";
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$endw = "table";
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};
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/^\@((?:small)?example)/ and do {
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push @endwstack, $endw;
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$endw = $1;
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$shift = "\t";
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$_ = ""; # need a paragraph break
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};
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/^\@itemx?\s*(.+)?$/ and do {
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if (defined $1) {
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# Entity escapes prevent munging by the <> processing below.
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$_ = "\n=item $ic\<$1\>\n";
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} else {
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$_ = "\n=item $ic\n";
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$ic =~ y/A-Ya-y1-8/B-Zb-z2-9/;
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}
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};
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$section .= $shift.$_."\n";
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}
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die "No filename or title\n" unless defined $fn && defined $tl;
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$sects{NAME} = "$fn \- $tl\n";
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$sects{FOOTNOTES} .= "=back\n" if exists $sects{FOOTNOTES};
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for $sect (qw(NAME SYNOPSIS DESCRIPTION OPTIONS ENVIRONMENT FILES
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BUGS NOTES FOOTNOTES SEEALSO AUTHOR COPYRIGHT)) {
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if(exists $sects{$sect}) {
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$head = $sect;
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$head =~ s/SEEALSO/SEE ALSO/;
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print "=head1 $head\n\n";
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print scalar unmunge ($sects{$sect});
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print "\n";
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}
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}
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sub usage
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{
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die "usage: $0 [-D toggle...] [infile [outfile]]\n";
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}
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sub postprocess
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{
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local $_ = $_[0];
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# @value{foo} is replaced by whatever 'foo' is defined as.
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s/\@value\{([a-zA-Z0-9_-]+)\}/$defs{$1}/g;
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# Formatting commands.
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s/\@(?:dfn|var|emph|cite|i)\{([^\}]*)\}/I<$1>/g;
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s/\@(?:code|kbd)\{([^\}]*)\}/C<$1>/g;
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s/\@(?:samp|strong|key|b)\{([^\}]*)\}/B<$1>/g;
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s/\@sc\{([^\}]*)\}/\U$1/g;
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s/\@file\{([^\}]*)\}/F<$1>/g;
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s/\@w\{([^\}]*)\}/S<$1>/g;
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s/\@(?:dmn|math)\{([^\}]*)\}/$1/g;
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# Cross references are thrown away, as are @noindent and @refill.
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# (@noindent is impossible in .pod, and @refill is unnecessary.)
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# @* is also impossible in .pod; we discard it and any newline that
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# follows it.
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s/\@xref\{(?:[^\}]*)\}[^.]*.//g;
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s/\s+\(\@pxref\{(?:[^\}]*)\}\)//g;
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s/;\s+\@pxref\{(?:[^\}]*)\}//g;
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s/\@noindent\s*//g;
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s/\@refill//g;
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s/\@\*\s*\n?//g;
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# @uref can take one, two, or three arguments, with different
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# semantics each time. @url and @email are just like @uref with
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# one argument, for our purposes.
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s/\@(?:uref|url|email)\{([^\},]*)\}/<C<$1>>/g;
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s/\@uref\{([^\},]*),([^\},]*)\}/$2 (C<$1>)/g;
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s/\@uref\{([^\},]*),([^\},]*),([^\},]*)\}/$3/g;
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# Turn B<blah I<blah> blah> into B<blah> I<blah> B<blah> to
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# match Texinfo semantics of @emph inside @samp.
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s/</</g;
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s/>/>/g;
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1 while (s/B<([^<>]*)I<([^>]+)>/B<$1>I<$2>B</g);
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1 while (s/I<([^<>]*)B<([^>]+)>/I<$1>B<$2>I</g);
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s/[BI]<>//g;
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s/([BI])<(\s+)([^>]+)>/$2$1<$3>/g;
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s/([BI])<([^>]+?)(\s+)>/$1<$2>$3/g;
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# Extract footnotes. This has to be done after all other
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# processing because otherwise the regexp will choke on formatting
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# inside @footnote.
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while (/\@footnote/g) {
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s/\@footnote\{([^\}]+)\}/[$fnno]/;
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add_footnote($1, $fnno);
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$fnno++;
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}
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return $_;
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}
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sub unmunge
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{
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# Replace escaped symbols with their equivalents.
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local $_ = $_[0];
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s/</E<lt>/g;
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s/>/E<gt>/g;
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s/{/\{/g;
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s/}/\}/g;
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s/&at;/\@/g;
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s/&/&/g;
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return $_;
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}
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sub add_footnote
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{
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unless (exists $sects{FOOTNOTES}) {
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$sects{FOOTNOTES} = "\n=over 4\n\n";
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}
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$sects{FOOTNOTES} .= "=item $fnno.\n\n"; $fnno++;
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$sects{FOOTNOTES} .= $_[0];
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$sects{FOOTNOTES} .= "\n\n";
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}
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