<?php
/*
Plugin Name: Category Stylesheets
Plugin URI: http://extralogical.net/projects/
Description: Apply category-specific stylesheets to posts and archives.
Author: Ben Eastaugh
Version: 1.0
Author URI: http://extralogical.net/
*/
 
function category_stylesheet_link() {
	if (is_single()) {
		$cats = array();
		$cat_objs = get_the_category(get_the_ID());
		foreach ($cat_objs as $cat)
			array_push($cats, $cat->cat_ID);
	} elseif (is_category()) {
		$cats = array(get_query_var('cat'));
	}
 
	if (!isset($cats) || empty($cats)) return;
 
	foreach ($cats as $cat_ID)
		printf('<link rel="stylesheet" type="text/css" href="%s" />' . "\n",
			get_bloginfo('stylesheet_directory') .
			'/category-' . $cat_ID . '.css');
}
 
add_action('wp_head', 'category_stylesheet_link');
 
?>