Contents of 'wp-content/plugins/post-functions/post-functions.php'
<?php
/**
 * @author Simon Ottenhaus
 * @version 0.1
 */
/*
Plugin Name: Post Functions
Plugin URI: 
Description: ...
Author: Simon Ottenhaus
Version: 0.1
Author URI: http://familie-ottenhaus.de/simon/blog/
*/
 
include_once "post-functions-admin.php";
 
class PostFunctions{
 
	function substitute($orig, $func_name, $func_args, $inner)
	{
		$enabledFunctions = get_option('post_functions_enabled');
		if(!in_array($func_name, explode(",", $enabledFunctions))){
			return $orig;
		} else {
			$ret = call_user_func (array(&$this, 'pf_' . $func_name), $func_args, $inner);
			return $ret;
		}
	}
 
	function pf_printfile($args, $inner) {
		$p = explode("|", $args);
		$filename = $p[0];
		if(substr($filename,0,1)=="/") $filename = substr($filename,1);
		$filepath = ABSPATH . $filename;
		unset($p[0]);
		$settings = $this->explodeKeyValue( $p , '|', '=', true );
 
 
		if ( file_exists( $filepath ) ) {
			$ret = "";
			if ( isset ( $settings[ 'displaypath' ] ) ) $ret = "Contents of '$filename'\n";
			$ret .= file_get_contents($filepath);
			return $ret;
		} else {
			return "'$filename' not found.";
		}
 
	}
 
	function pf_fold($args, $inner) {
		global $post_functions_fold_id;
		if(!isset($post_functions_fold_id))$post_functions_fold_id=0;
		$post_functions_fold_id++;
		$id = "fold_$post_functions_fold_id";
		return "<a class=\"js\" onclick=\"$('#$id').slideToggle('slow'); \">" . $args . "</a><span style=\"display:none;\" id=\"$id\">$inner</span>";
	}
 
	function pf_jslink($args, $inner) {
		return '<a class="js" onclick="' . htmlspecialchars($inner) . '">' . $args . '</a>';
	}
	function pf_bloginfo($args, $inner){
		return get_bloginfo($args);
	}
	function pf_link($args, $inner){
		$homeUrl = get_bloginfo("url");
		$parts = explode("|", $args);
		$url = $parts[0];
		$url_ellipsis_length = get_option('post_functions_url_ellipsis_length');
 
		if(sizeof($parts) > 1) {
			$text = $parts[1];
		} else{
			$text = $url;
			$this->str_remove($text, "://");
			if ( substr($text, 0, 4) == "www.") $text = substr($text, 4);
			if(substr($text, -1) == '/') $text = substr($text, 0, -1);
			if($url_ellipsis_length > 0 && strlen($text) > $url_ellipsis_length) {
				$text = $this->str_ellipsis_url($text);
			}
		}
 
		if(!preg_match("#^\w+://#", $url)) $url = "$homeUrl/$url";
 
		if(strlen($url) > 0){
			$s = $url;
			if($this->str_remove($s, "://")) {
				$this->str_remove($s, "/");
			}
			if(strlen($s) > 0 && strpos($s, '.')===false && substr($s, -1) != '/') $url .= '/';
		}
 
		return "<a href=\"$url\">$text</a>";
	}
 
	function str_remove(&$string, $find) {
		$pos = strpos($string, $find);
		if($pos === false) {
			return false;
		} else {
			$string = substr($string, $pos + 3);
			return true;
		}
	}
 
	function str_ellipsis_url($url) {
		$parts = explode('/', $url);
		$size = sizeof($parts);
		if($size > 2){
			return $parts[0] . '/.../' . $parts[$size - 1];
		}
		return $url;
	}
	function explodeKeyValue($str, $item_sep, $assign_sep, $trim=true){
		$ret = array();
		$arr = is_array( $str ) ? $str : explode ( $item_sep, $str );
		foreach ( $arr as $item ) {
			if ( $trim ) $item = trim ( $item );
			$p = explode ( $assign_sep, $item );
			$ret[ $p[0] ] = isset( $p[1] ) ? $p[1] : 1;
		}
		return $ret;
	}
 
 
	function before_filter($content)
	{
		$parts = preg_split( "#(\\[\\/?\\w+(?::[^\\]]+)?\\])#", $content, -1, PREG_SPLIT_DELIM_CAPTURE );
		$parts[] = "";
		$parts[] = "";
		$tokens = array();
		$out = array();
 
		$out[] = $parts[0];
 
		for($i=1;$i<sizeof($parts)-3;$i+=2){
			$m = explode(":", substr($parts[$i],1,-1), 2);
			$next = substr($parts[$i+2],1,-1);
			$func_name = $m[0];
			$func_args = sizeof($m)>1 ? $m[1] : "";
			$inner = "";
			$orig = $parts[$i];
			if ( "/".$func_name == $next ) {
				$inner = $parts[$i+1];
				$i+=2;
				$orig .= $parts[$i+1] . $parts[$i+2];
			}
			$out[] = $this->substitute($orig, $func_name, $func_args, $inner);
			$out[] = $parts[$i+1];
		}
		$content = implode("", $out);
 
		return $content;
	}
 
	function wp_head_style() {
		echo "\n\t".'<!-- Generated by Post Functions Plugin -->'
			. "\n\t".'<style type="text/css" media="screen">'
			. "\n\t\t".'a.js { cursor:pointer; }'
			. "\n\t".'</style>'
			. "\n\t".'<!-- /Post Functions Plugin -->'
			. "\n\t";		
	}
 
}
$myPostFunctions = new PostFunctions();
 
// We want to run before other filters; hence, a priority of 0 was chosen.
// The lower the number, the higher the priority.  10 is the default and
// several formatting filters run at or around 6.
add_filter('the_content', array(&$myPostFunctions, 'before_filter'), 0);
add_filter('the_excerpt', array(&$myPostFunctions, 'before_filter'), 0);
add_action('wp_head', array(&$myPostFunctions, 'wp_head_style'));
 
 
?>

Contents of 'wp-content/plugins/post-functions/post-functions-admin.php'
<?
 
function post_functions_admin_menu() {
	add_option("post_functions_url_ellipsis_length", "40");
	add_option("post_functions_enabled", "bloginfo,link,jslink"); 
	add_options_page('Post Functions Options', 'Post Functions', 8, __FILE__, 'post_functions_admin_options');
}
 
function post_functions_admin_options() {
?>
<div class="wrap">
<h2>Post Functions</h2>
 
<form method="post" action="options.php">
<?php wp_nonce_field('update-options'); ?>
 
<table class="form-table">
 
<tr valign="top">
<th scope="row">Url Ellipsis Length</th>
<td><input type="text" class="small-text" name="post_functions_url_ellipsis_length" value="<?php echo get_option('post_functions_url_ellipsis_length'); ?>" />
<span class="setting-description">Insert ellipsis-dots ("...") into urls longer than x characters. Use "0" to disable this function.</span></td>
</tr>
 
<tr valign="top">
<th scope="row">Enabled Functions</th>
<td><input type="text" class="regular-text code" name="post_functions_enabled" value="<?php echo get_option('post_functions_enabled'); ?>" />
<span class="setting-description">Enabled Functions</span></td>
</tr>
 
</table>
 
<input type="hidden" name="action" value="update" />
<input type="hidden" name="page_options" value="post_functions_url_ellipsis_length,post_functions_enabled" />
 
<p class="submit">
<input type="submit" class="button-primary" value="<?php _e('Save Changes') ?>" />
</p>
 
</form>
</div>
 
<?
}
 
add_action('admin_menu', 'post_functions_admin_menu');
 
?>