Resource auto-linking filter! Developed by Eloy - thanks! (see bug 1389)

lang/en/resource.php

@@ -28,6 +28,7 @@
 $string['fetcherror'] = 'An error was found while trying to retrieve the web page.';
 $string['fetchservererror'] = 'An error was found with the remote server while trying to retrieve the web page (possibly a program error).</p>';
 $string['filename'] = 'File name';
+$string['filtername'] = "Resource Auto-linking";
 $string['fulltext'] = 'Full text';
 $string['htmlfragment'] = 'HTML fragment';
 $string['maindirectory'] = 'Main files directory';

mod/resource/filter.php

@@ -0,0 +1,136 @@
+<?PHP // $Id$
+    //This function provides automatic linking to
+    //resources when its name (title) is found inside every Moodle text
+    //It's based in the glosssary filter by Williams Castillo
+    //Modifications by stronk7. Enjoy! :-)
+
+    $textfilter_function='resource_names_filter';
+
+    if (function_exists($textfilter_function)) {
+        return;
+    }
+
+    function resource_names_filter($courseid, $text) {
+
+        global $CFG;
+
+        if (empty($courseid)) {
+            if ($site = get_site()) {
+                $courseid = $site->id;
+            }
+        }
+
+        switch ($CFG->dbtype) {
+            case 'postgres7':
+                $as = 'as';
+                break;
+            case 'mysql':
+                $as = '';
+                break;
+        }    
+
+        ///sorting by the lenght of the title in order to assure that large resources 
+        ///could be linked first, if they exist in the text to parse
+
+        switch ($CFG->dbtype) {
+            case "postgres7":
+            case "mysql":
+                $rbylenght = "CHAR_LENGTH(name) desc";
+            break;
+            default:
+                $rbylenght = "";
+            break;
+        }
+
+        $resources = get_records_select("resource", "course = $courseid", "$rbylenght");
+
+        if (!empty($resources)) {
+            $cm = '';
+            foreach ($resources as $resource) {
+                if (!$cm = get_coursemodule_from_instance("resource", $resource->id, $courseid)) {
+                    $cm->id = 1;
+                }
+                $title = strip_tags($resource->name);
+                $href_tag_begin = "<a class=\"autolink\" title=\"$title\" href=\"$CFG->wwwroot/mod/resource/view.php?id=$cm->id\">";
+                $currentname = $resource->name;                    
+                if ($currentname = trim($currentname)) {
+                    $text = resource_link_names($text,$currentname,$href_tag_begin, "</a>");
+                }
+            }
+        }
+        return $text;
+    }
+
+    function resource_link_names($text,$name,$href_tag_begin,$href_tag_end = "</a>") {
+
+        $list_of_words_cp = $name;
+
+        $list_of_words_cp = trim($list_of_words_cp,'|');
+
+        $list_of_words_cp = trim($list_of_words_cp);
+
+        $list_of_words_cp = preg_quote($list_of_words_cp);
+
+        $invalidprefixs = "([a-zA-Z0-9])";
+        $invalidsufixs  = "([a-zA-Z0-9])";
+
+        //Avoid seaching in the string if it's inside invalidprefixs and invalidsufixs
+        $words = array();
+        $regexp = '/'.$invalidprefixs.'('.$list_of_words_cp.')|('.$list_of_words_cp.')'.$invalidsufixs.'/is';
+        preg_match_all($regexp,$text,$list_of_words);
+
+        foreach (array_unique($list_of_words[0]) as $key=>$value) {
+            $words['<*'.$key.'*>'] = $value;
+        }
+        if (!empty($words)) {
+            $text = str_replace($words,array_keys($words),$text);
+        }
+
+        //Now avoid searching inside the <nolink>tag
+        $excludes = array();
+        preg_match_all('/<nolink>(.+?)<\/nolink>/is',$text,$list_of_excludes);
+        foreach (array_unique($list_of_excludes[0]) as $key=>$value) {
+            $excludes['<+'.$key.'+>'] = $value;
+        }
+        if (!empty($excludes)) {
+            $text = str_replace($excludes,array_keys($excludes),$text);
+        }
+
+        //Now avoid searching inside links
+        $links = array();
+        preg_match_all('/<A (.+?)>(.+?)<\/A>/is',$text,$list_of_links);
+        foreach (array_unique($list_of_links[0]) as $key=>$value) {
+            $links['<@'.$key.'@>'] = $value;
+        }
+        if (!empty($links)) {
+            $text = str_replace($links,array_keys($links),$text);
+        }
+
+        //Now avoid searching inside every tag
+        $final = array();
+        preg_match_all('/<(.+?)>/is',$text,$list_of_tags);
+        foreach (array_unique($list_of_tags[0]) as $key=>$value) {
+            $final['<|'.$key.'|>'] = $value;
+        }
+        if (!empty($final)) {
+            $text = str_replace($final,array_keys($final),$text);
+        }
+
+        $text = preg_replace('/('.$list_of_words_cp.')/is', $href_tag_begin.'$1'.$href_tag_end,$text);
+
+        //Now rebuild excluded areas
+        if (!empty($final)) {
+            $text = str_replace(array_keys($final),$final,$text);
+        }
+        if (!empty($links)) {
+            $text = str_replace(array_keys($links),$links,$text);
+        }
+        if (!empty($excludes)) {
+            $text = str_replace(array_keys($excludes),$excludes,$text);
+        }
+        if (!empty($words)) {
+            $text = str_replace(array_keys($words),$words,$text);
+        }
+        return $text;
+    }
+?>