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#!/usr/bin/perl
package IkiWiki::Plugin::highlight;
# This has been tested with highlight 2.16 and highlight 3.2+svn19.
# In particular version 3.2 won't work. It detects the different
# versions by the presence of the the highlight::DataDir class.
use warnings;
use strict;
use IkiWiki 3.00;
use Encode;
my $data_dir;
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 => "htmlizeformat", id => "highlight",
call => \&htmlizeformat, last => 1);
}
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,
},
filetypes_conf => {
type => "string",
example => "/etc/highlight/filetypes.conf",
description => "location of highlight's filetypes.conf",
safe => 0,
rebuild => undef,
},
langdefdir => {
type => "string",
example => "/usr/share/highlight/langDefs",
description => "location of highlight's langDefs directory",
safe => 0,
rebuild => undef,
},
}
sub checkconfig () {
eval q{use highlight};
if (highlight::DataDir->can('new')) {
$data_dir=new highlight::DataDir();
$data_dir->searchDataDir("");
} else {
$data_dir=undef;
}
if (! exists $config{filetypes_conf}) {
$config{filetypes_conf}=
($data_dir ? $data_dir->getConfDir() : "/etc/highlight/")
. "filetypes.conf";
}
if (! exists $config{langdefdir}) {
$config{langdefdir}=
($data_dir ? $data_dir->getLangPath("")
: "/usr/share/highlight/langDefs");
}
if (exists $config{tohighlight} && read_filetypes()) {
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 htmlizeformat {
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 () {
my $f;
if (!open($f, $config{filetypes_conf})) {
warn($config{filetypes_conf}.": ".$!);
return 0;
};
local $/=undef;
my $config=<$f>;
close $f;
# highlight >= 3.2 format (bind-style)
while ($config=~m/Lang\s*=\s*\"([^"]+)\"[,\s]+Extensions\s*=\s*{([^}]+)}/sg) {
my $lang=$1;
foreach my $bit (split ',', $2) {
$bit=~s/.*"(.*)".*/$1/s;
$ext2lang{$bit}=$lang;
}
}
# highlight < 3.2 format
if (! keys %ext2lang) {
foreach (split("\n", $config)) {
if (/^\$ext\((.*)\)=(.*)$/) {
$ext2lang{$_}=$1 foreach $1, split ' ', $2;
}
}
}
return $filetypes_read=1;
}
# Given a filename extension, determines the language definition to
# use to highlight it.
sub ext2langfile ($) {
my $ext=shift;
my $langfile="$config{langdefdir}/$ext.lang";
return $langfile if exists $highlighters{$langfile};
read_filetypes() unless $filetypes_read;
if (exists $ext2lang{$ext}) {
return "$config{langdefdir}/$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}) {
$gen = highlight::CodeGenerator::getInstance($highlight::XHTML);
$gen->setFragmentCode(1); # generate html fragment
$gen->setHTMLEnclosePreTag(1); # include stylish <pre>
if ($data_dir){
# new style, requires a real theme, but has no effect
$gen->initTheme($data_dir->getThemePath("seashell.theme"));
} else {
# old style, anything works.
$gen->initTheme("/dev/null");
}
$gen->loadLanguage($langfile); # must come after initTheme
$gen->setEncoding("utf-8");
$highlighters{$langfile}=$gen;
}
else {
$gen=$highlighters{$langfile};
}
return $gen->generateString($input);
}
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