cache highlighters to optimise

[ikiwiki.git] / IkiWiki / Plugin / highlight.pm

diff --git a/IkiWiki/Plugin/highlight.pm b/IkiWiki/Plugin/highlight.pm
index 117ab5898a427607fcc672822ebb4198fb7f12a6..4c02f6c236e4feca4f6113e73f793bee683fef2c 100644 (file)
--- a/IkiWiki/Plugin/highlight.pm
+++ b/IkiWiki/Plugin/highlight.pm
@@ -4,7 +4,6 @@ package IkiWiki::Plugin::highlight;
 use warnings;
 use strict;
 use IkiWiki 3.00;
-use highlight;
 
 # locations of highlight's files
 my $filetypes="/etc/highlight/filetypes.conf";
@@ -13,6 +12,9 @@ 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 () {
@@ -24,7 +26,7 @@ sub getsetup () {
                tohighlight => {
                        type => "string",
                        example => ".c .h .cpp .pl .py Makefile:make",
-                       description => "source files to syntax highlight",
+                       description => "types of source files to syntax highlight",
                        safe => 1,
                        rebuild => 1,
                },
@@ -59,8 +61,20 @@ sub checkconfig () {
        }
 }
 
+sub htmlizefallback {
+       my $format=lc shift;
+       my $langfile=ext2langfile($format);
+
+       if (! defined $langfile) {
+               return;
+       }
+
+       return highlight($langfile, shift);
+}
+
 my %ext2lang;
 my $filetypes_read=0;
+my %highlighters;
 
 # Parse highlight's config file to get extension => language mappings.
 sub read_filetypes () {
@@ -75,23 +89,23 @@ sub read_filetypes () {
        $filetypes_read=1;
 }
 
-sub langfile ($) {
-       return "$langdefdir/$_[0].lang";
-}
 
 # 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 langfile($ext2lang{$ext});
+               return "$langdefdir/$ext2lang{$ext}.lang";
        }
        # If a language only has one common extension, it will not
        # be listed in filetypes, so check the langfile.
-       elsif (-e langfile($ext)) {
-               return langfile($ext);
+       elsif (-e $langfile) {
+               return $langfile;
        }
        else {
                return undef;
@@ -103,16 +117,27 @@ sub highlight ($$) {
        my $langfile=shift;
        my $input=shift;
 
-       my $gen = highlightc::CodeGenerator_getInstance($highlightc::XHTML);
-       $gen->setFragmentCode(1); # generate html fragment
-       $gen->setHTMLEnclosePreTag(1); # include stylish <pre>
-       $gen->initLanguage($langfile);
-       $gen->initTheme("/dev/null"); # theme is not needed because CSS is not emitted
-       $gen->setEncoding("utf-8");
+       eval q{use highlight};
+       if ($@) {
+               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>
+               $gen->initLanguage($langfile);
+               $gen->initTheme("/dev/null"); # theme is not needed because CSS is not emitted
+               $gen->setEncoding("utf-8");
+               $highlighters{$langfile}=$gen;
+       }
+       else {          
+               $gen=$highlighters{$langfile};
+       }
 
-       my $output=$gen->generateString($input);
-       highlightc::CodeGenerator_deleteInstance($gen);
-       return $output;
+       return $gen->generateString($input);
 }
 
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