Replace markdown-style [1] link indexes in plain text email bodies. [1]: http://daringfireball.net/projects/markdown/

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Replace markdown-style [1] link indexes in plain text email bodies
 - Fixed issues where HTML comments inside style tag would hang Internet Explorer
 - Improved mailto: link arguments handling (#1489363)
 - Use DOMDocument LIBXML_PARSEHUGE and LIBXML_COMPACT options if possible (#1489302)

program/lib/Roundcube/rcube_string_replacer.php

@@ -24,11 +24,14 @@
  */
 class rcube_string_replacer
 {
-    public static $pattern = '/##str_replacement\[([0-9]+)\]##/';
+    public static $pattern = '/##str_replacement\{([0-9]+)\}##/';
     public $mailto_pattern;
     public $link_pattern;
+
     private $values = array();
     private $options = array();
+    private $linkrefs = array();
+    private $urls = array();
 
 
     function __construct($options = array())
@@ -45,6 +48,8 @@ class rcube_string_replacer
             ."@$utf_domain"                                                 // domain-part
             ."(\?[$url1$url2]+)?"                                           // e.g. ?subject=test...
             .")/";
+        $this->linkref_index = '/\[([a-zA-Z0-9]+)\]:?\s*##str_replacement\{(\d+)\}##/';
+        $this->linkref_pattern = '/\[([a-zA-Z0-9]+)\]/';
 
         $this->options = $options;
     }
@@ -67,7 +72,7 @@ class rcube_string_replacer
      */
     public function get_replacement($i)
     {
-        return '##str_replacement['.$i.']##';
+        return '##str_replacement{'.$i.'}##';
     }
 
     /**
@@ -96,6 +101,7 @@ class rcube_string_replacer
             $attrib['href'] = $url_prefix . $url;
 
             $i = $this->add(html::a($attrib, rcube::Q($url)) . $suffix);
+            $this->urls[$i] = $attrib['href'];
         }
 
         // Return valid link for recognized schemes, otherwise
@@ -103,6 +109,33 @@ class rcube_string_replacer
         return $i >= 0 ? $prefix . $this->get_replacement($i) : $matches[0];
     }
 
+    /**
+     * Callback to add an entry to the link index
+     */
+    public function linkref_addindex($matches)
+    {
+        $key = $matches[1];
+        $this->linkrefs[$key] = $matches[2];
+
+        return $matches[0];
+    }
+
+    /**
+     * Callback to replace link references with real links
+     */
+    public function linkref_callback($matches)
+    {
+        $i = 0;
+        $key = isset($this->linkrefs[$matches[1]]) ? $this->linkrefs[$matches[1]] : '-';
+        if ($url = $this->urls[$key]) {
+            $attrib = (array)$this->options['link_attribs'];
+            $attrib['href'] = $url;
+            $i = $this->add(html::a($attrib, rcube::Q($matches[1])));
+        }
+
+        return $i > 0 ? '['.$this->get_replacement($i).']' : $matches[0];
+    }
+
     /**
      * Callback function used to build mailto: links around e-mail strings
      *
@@ -142,6 +175,9 @@ class rcube_string_replacer
         // search for patterns like links and e-mail addresses
         $str = preg_replace_callback($this->link_pattern, array($this, 'link_callback'), $str);
         $str = preg_replace_callback($this->mailto_pattern, array($this, 'mailto_callback'), $str);
+        // resolve link references
+        $str = preg_replace_callback($this->linkref_index, array($this, 'linkref_addindex'), $str);
+        $str = preg_replace_callback($this->linkref_pattern, array($this, 'linkref_callback'), $str);
 
         return $str;
     }

tests/Framework/StringReplacer.php

@@ -56,4 +56,20 @@ class Framework_StringReplacer extends PHPUnit_Framework_TestCase
 
         $this->assertEquals($output, $result);
     }
+
+    function test_linkrefs()
+    {
+        $input = "This is a sample message [1] to test the new linkref [ref0] replacement feature of [Roundcube].\n";
+        $input.= "\n";
+        $input.= "[1] http://en.wikipedia.org/wiki/Email\n";
+        $input.= "[ref0] www.link-ref.com\n";
+
+        $replacer = new rcube_string_replacer;
+        $result = $replacer->replace($input);
+        $result = $replacer->resolve($result);
+
+        $this->assertContains('[<a href="http://en.wikipedia.org/wiki/Email">1</a>] to', $result, "Numeric linkref replacements");
+        $this->assertContains('[<a href="http://www.link-ref.com">ref0</a>] repl', $result, "Alphanum linkref replacements");
+        $this->assertContains('of [Roundcube].', $result, "Don't touch strings wihtout an index entry");
+    }
 }