3 files changed, 89 insertions, 12 deletions

diff --git a/plugins/markdown/README.md b/plugins/markdown/README.md
index defaacd1..4f021871 100644
--- a/plugins/markdown/README.md
+++ b/plugins/markdown/README.md
@@ -2,25 +2,31 @@
 
 Convert all your shaares description to HTML formatted Markdown.
 
-Read more about Markdown syntax here.
+[Read more about Markdown syntax](http://daringfireball.net/projects/markdown/syntax).
+
+Markdown processing is done with [Parsedown library](https://github.com/erusev/parsedown).
 
 ### Installation
 
-Clone this repository inside your `tpl/plugins/` directory, or download the archive and unpack it there.
+As a default plugin, it should already be in `tpl/plugins/` directory.
+If not, download and unpack it there.
+
 The directory structure should look like:
 
 ```
-??? plugins
-    ??? markdown
-        ??? help.html
-        ??? markdown.css
-        ??? markdown.meta
-        ??? markdown.php
-        ??? Parsedown.php
-        ??? README.md
+--- plugins
+  |--- markdown
+     |--- help.html
+     |--- markdown.css
+     |--- markdown.meta
+     |--- markdown.php
+     |--- Parsedown.php
+     |--- README.md
 ```
 
-To enable the plugin, add `markdown` to your list of enabled plugins in `data/config.php`
+To enable the plugin, just check it in the plugin administration page.
+
+You can also add `markdown` to your list of enabled plugins in `data/config.php`
 (`ENABLED_PLUGINS` array).
 
 This should look like:
@@ -29,6 +35,12 @@ This should look like:
 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode', 'any_other_plugin', 'markdown')
 ```
 
+### No Markdown tag
+
+If the tag `.nomarkdown` is set for a shaare, it won't be converted to Markdown syntax.
+ 
+> Note: it's a private tag (leading dot), so it won't be displayed to visitors.
+
 ### Known issue
 
 #### Redirector
diff --git a/plugins/markdown/markdown.php b/plugins/markdown/markdown.php
index 5a702c7b..544ed22e 100644
--- a/plugins/markdown/markdown.php
+++ b/plugins/markdown/markdown.php
@@ -8,6 +8,12 @@
 
 require_once 'Parsedown.php';
 
+/*
+ * If this tag is used on a shaare, the description won't be processed by Parsedown.
+ * Using a private tag so it won't appear for visitors.
+ */
+define('NO_MD_TAG', '.nomarkdown');
+
 /**
  * Parse linklist descriptions.
  *
@@ -18,6 +24,9 @@ require_once 'Parsedown.php';
 function hook_markdown_render_linklist($data)
 {
     foreach ($data['links'] as &$value) {
+        if (!empty($value['tags']) && noMarkdownTag($value['tags'])) {
+            continue;
+        }
         $value['description'] = process_markdown($value['description']);
     }
 
@@ -36,6 +45,9 @@ function hook_markdown_render_daily($data)
     // Manipulate columns data
     foreach ($data['cols'] as &$value) {
         foreach ($value as &$value2) {
+            if (!empty($value2['tags']) && noMarkdownTag($value2['tags'])) {
+                continue;
+            }
             $value2['formatedDescription'] = process_markdown($value2['formatedDescription']);
         }
     }
@@ -44,6 +56,18 @@ function hook_markdown_render_daily($data)
 }
 
 /**
+ * Check if noMarkdown is set in tags.
+ *
+ * @param string $tags tag list
+ *
+ * @return bool true if markdown should be disabled on this link.
+ */
+function noMarkdownTag($tags)
+{
+    return strpos($tags, NO_MD_TAG) !== false;
+}
+
+/**
  * When link list is displayed, include markdown CSS.
  *
  * @param array $data includes data.
@@ -75,6 +99,12 @@ function hook_markdown_render_editlink($data)
 {
     // Load help HTML into a string
     $data['edit_link_plugin'][] = file_get_contents(PluginManager::$PLUGINS_PATH .'/markdown/help.html');
+
+    // Add no markdown 'meta-tag' in tag list if it was never used, for autocompletion.
+    if (! in_array(NO_MD_TAG, $data['tags'])) {
+        $data['tags'][NO_MD_TAG] = 0;
+    }
+
     return $data;
 }
 
diff --git a/tests/plugins/PluginMarkdownTest.php b/tests/plugins/PluginMarkdownTest.php
index 8e1a128a..fa7e1d52 100644
--- a/tests/plugins/PluginMarkdownTest.php
+++ b/tests/plugins/PluginMarkdownTest.php
@@ -102,7 +102,8 @@ class PluginMarkdownTest extends PHPUnit_Framework_TestCase
     /**
      * Test sanitize_html().
      */
-    function testSanitizeHtml() {
+    function testSanitizeHtml()
+    {
         $input = '< script src="js.js"/>';
         $input .= '< script attr>alert(\'xss\');</script>';
         $input .= '<style> * { display: none }</style>';
@@ -114,4 +115,38 @@ class PluginMarkdownTest extends PHPUnit_Framework_TestCase
         $input = escape($input);
         $this->assertEquals($input, sanitize_html($input));
     }
+
+    /**
+     * Test the no markdown tag.
+     */
+    function testNoMarkdownTag()
+    {
+        $str = 'All _work_ and `no play` makes Jack a *dull* boy.';
+        $data = array(
+            'links' => array(array(
+                'description' => $str,
+                'tags' => NO_MD_TAG
+            ))
+        );
+
+        $data = hook_markdown_render_linklist($data);
+        $this->assertEquals($str, $data['links'][0]['description']);
+
+        $data = array(
+            // Columns data
+            'cols' => array(
+                // First, second, third.
+                0 => array(
+                    // nth link
+                    0 => array(
+                        'formatedDescription' => $str,
+                        'tags' => NO_MD_TAG
+                    ),
+                ),
+            ),
+        );
+
+        $data = hook_markdown_render_daily($data);
+        $this->assertEquals($str, $data['cols'][0][0]['formatedDescription']);
+    }
 }