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#!/usr/bin/perl
package IkiWiki::Plugin::highlight;
use warnings;
use strict;
use IkiWiki 3.00;
use Encode;
# locations of highlight's files
my $filetypes="/etc/highlight/filetypes.conf";
my $langdefdir="/usr/share/highlight/langDefs";
sub import {
hook(type => "getsetup", id => "highlight", call => \&getsetup);
hook(type => "checkconfig", id => "highlight", call => \&checkconfig);
# this hook is used by the format plugin
hook(type => "htmlizefallback", id => "highlight", call =>
\&htmlizefallback);
}
sub getsetup () {
return
plugin => {
safe => 1,
rebuild => 1, # format plugin
section => "format",
},
tohighlight => {
type => "string",
example => ".c .h .cpp .pl .py Makefile:make",
description => "types of source files to syntax highlight",
safe => 1,
rebuild => 1,
},
}
sub checkconfig () {
if (exists $config{tohighlight}) {
foreach my $file (split ' ', $config{tohighlight}) {
my @opts = $file=~s/^\.// ?
(keepextension => 1) :
(noextension => 1);
my $ext = $file=~s/:(.*)// ? $1 : $file;
my $langfile=ext2langfile($ext);
if (! defined $langfile) {
error(sprintf(gettext(
"tohighlight contains unknown file type '%s'"),
$ext));
}
hook(
type => "htmlize",
id => $file,
call => sub {
my %params=@_;
highlight($langfile, $params{content});
},
longname => sprintf(gettext("Source code: %s"), $file),
@opts,
);
}
}
}
sub htmlizefallback {
my $format=lc shift;
my $langfile=ext2langfile($format);
if (! defined $langfile) {
return;
}
return Encode::decode_utf8(highlight($langfile, shift));
}
my %ext2lang;
my $filetypes_read=0;
my %highlighters;
# Parse highlight's config file to get extension => language mappings.
sub read_filetypes () {
open (IN, $filetypes) || error("$filetypes: $!");
while (<IN>) {
chomp;
if (/^\$ext\((.*)\)=(.*)$/) {
$ext2lang{$_}=$1 foreach $1, split ' ', $2;
}
}
close IN;
$filetypes_read=1;
}
# Given a filename extension, determines the language definition to
# use to highlight it.
sub ext2langfile ($) {
my $ext=shift;
my $langfile="$langdefdir/$ext.lang";
return $langfile if exists $highlighters{$langfile};
read_filetypes() unless $filetypes_read;
if (exists $ext2lang{$ext}) {
return "$langdefdir/$ext2lang{$ext}.lang";
}
# If a language only has one common extension, it will not
# be listed in filetypes, so check the langfile.
elsif (-e $langfile) {
return $langfile;
}
else {
return undef;
}
}
# Interface to the highlight C library.
sub highlight ($$) {
my $langfile=shift;
my $input=shift;
eval q{use highlight};
if ($@) {
print STDERR gettext("warning: highlight perl module not available; falling back to pass through");
return $input;
}
my $gen;
if (! exists $highlighters{$langfile}) {
$gen = highlightc::CodeGenerator_getInstance($highlightc::XHTML);
$gen->setFragmentCode(1); # generate html fragment
$gen->setHTMLEnclosePreTag(1); # include stylish <pre>
$gen->initTheme("/dev/null"); # theme is not needed because CSS is not emitted
$gen->initLanguage($langfile); # must come after initTheme
$gen->setEncoding("utf-8");
$highlighters{$langfile}=$gen;
}
else {
$gen=$highlighters{$langfile};
}
return $gen->generateString($input);
}
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