Update 06 June 2011: I’ve contacted the current developer and he’s accepted the patch. It should be appearing in a WP-Syntax near you shortly!
Update 16 July 2011: I’ve merged Chimo’s excellent patch which adds page range support. See the updated tutorial below for usage instructions. Thanks Chimo!
Update 27 July 2011: We have liftoff! This patch is finally part of the official plugin!
I’ve used a few different WordPress syntax highlighters in my day but WP-Syntax is easily the best of them. One issue that’s bothered me with WP-Syntax for a while now, however, is lack of line highlighting support so I decided to look into adding it myself. At the time of writing I’m using WP-Syntax 0.9.9.
To add highlighting support, open up /wp-content/plugins/wp-syntax/wp-syntax.php. You’ll need to modify two functions – wp_syntax_highlight and wp_syntax_before_filter. Here’s wp_syntax_highlight:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
| function wp_syntax_highlight($match)
{
global $wp_syntax_matches;
$i = intval($match[1]);
$match = $wp_syntax_matches[$i];
$language = strtolower(trim($match[1]));
$line = trim($match[2]);
$escaped = trim($match[3]);
$code = wp_syntax_code_trim($match[5]); if ($escaped == "true") $code = htmlspecialchars_decode($code);
$geshi = new GeSHi($code, $language);
$geshi->enable_keyword_links(false);
do_action_ref_array('wp_syntax_init_geshi', array(&$geshi));
//START LINE HIGHLIGHT SUPPORT $highlight = array(); if ( !empty($match[4]) ) { $highlight = strpos($match[4],',') == false ? array($match[4]) : explode(',', $match[4]); $h_lines = array(); for( $i=0; $i<sizeof($highlight); $i++ ) { $h_range = explode('-', $highlight[$i]); if( sizeof($h_range) == 2 ) $h_lines = array_merge( $h_lines, range($h_range[0], $h_range[1]) ); else array_push($h_lines, $highlight[$i]); } $geshi->highlight_lines_extra( $h_lines ); } //END LINE HIGHLIGHT SUPPORT
$output = "\n<div class=\"wp_syntax\">";
if ($line)
{
$output .= "<table><tr><td class=\"line_numbers\">";
$output .= wp_syntax_line_numbers($code, $line);
$output .= "</td><td class=\"code\">";
$output .= $geshi->parse_code();
$output .= "</td></tr></table>";
}
else
{
$output .= "<div class=\"code\">";
$output .= $geshi->parse_code();
$output .= "</div>";
}
return
$output .= "</div>\n";
return $output;
} |
and here’s wp_syntax_before_filter:
1
2
3
4
5
6
7
8
| function wp_syntax_before_filter($content)
{
return preg_replace_callback(
"/\s*<pre(?:lang=[\"']([\w-]+)[\"']|line=[\"'](\d*)[\"']|escaped=[\"'](true|false)?[\"']|highlight=[\"']((?:\d+[,-])*\d+)[\"']|\s)+>(.*)<\/pre>\s*/siU", "wp_syntax_substitute",
$content
);
} |
Updated/added lines are, of course, highlighted 🙂
Below is an example of the new functionality:
<pre lang=”php” highlight=”2″>
$foo = ‘foo’;
$bar = ‘bar’;
$foobar = ‘foobar’;
</pre>
$foo = 'foo';
$bar = 'bar'; $foobar = 'foobar'; |
<pre lang=”php” highlight=”1,2,5-7″>
$foo = ‘foo’;
$bar = ‘bar’;
$foobar = ‘foobar’;
$foo = ‘foo’;
$bar = ‘bar’;
$foobar = ‘foobar’;
$foo = ‘foo’;
$bar = ‘bar’;
$foobar = ‘foobar’;
</pre>
$foo = 'foo'; $bar = 'bar'; $foobar = 'foobar';
$foo = 'foo'; $bar = 'bar'; $foobar = 'foobar';
$foo = 'foo';
$bar = 'bar';
$foobar = 'foobar'; |
Remember to add highlight to the list of allowed <PRE> tag arguments in your themes functions.php file. Details on doing so can be found here.
Read More »
