Make the markdown-underline plugin awesome. 🎶

(now I need to give it its own repository)
(and to translate it into french)

user/config/plugins/markdown-underline.yaml

+enabled: true
+'*': b
+'**': strong
+_: em
+__: u

user/plugins/markdown-underline/blueprints.yaml

 name: Markdown Underline
-version: 0.1.0
-description: Use `__double underscore__` to create `<u>` tags.
-icon: plug
+version: 1.0.0
+description: |
+  Override the HTML tags generated by inline `*`, `**`, `_` and `__`.
+  The plugin defaults `__` to `u` for example to yield underlined text.
+icon: underline
 author:
-  name: Shady Oryx
+  name: Antoine Goutenoir
   email: antoine@goutenoir.com
 homepage: https://github.com/Goutte/grav-plugin-markdown-underline
 demo: https://courses.m3p2.ljbac.com
-keywords: grav, plugin, markdown, underline, underscores
-bugs: https://github.com/goutte/grav-plugin-markdown-underline/issues
-docs: https://github.com/goutte/grav-plugin-markdown-underline/blob/develop/README.md
+keywords: grav, plugin, markdown, underline, override, inline, block
+bugs: https://github.com/Goutte/grav-plugin-markdown-underline/issues
+docs: https://github.com/Goutte/grav-plugin-markdown-underline/blob/develop/README.md
 license: MIT
 
 form:
@@ -25,3 +27,27 @@ form:
         0: PLUGIN_ADMIN.DISABLED
       validate:
         type: bool
+    "*":
+      type: text
+      label: PLUGINS.MARKDOWN_UNDERLINE.*
+      default: 'em'
+      validate:
+        type: text
+    "**":
+      type: text
+      label: PLUGINS.MARKDOWN_UNDERLINE.**
+      default: 'strong'
+      validate:
+        type: text
+    "_":
+      type: text
+      label: PLUGINS.MARKDOWN_UNDERLINE._
+      default: 'em'
+      validate:
+        type: text
+    "__":
+      type: text
+      label: PLUGINS.MARKDOWN_UNDERLINE.__
+      default: 'u'
+      validate:
+        type: text

user/plugins/markdown-underline/languages.yaml

-
+en:
+  PLUGINS:
+    MARKDOWN_UNDERLINE:
+      "*": HTML tag to replace <code>*</code>
+      "**": HTML tag to replace <code>**</code>
+      "_": HTML tag to replace <code>_</code>
+      "__": HTML tag to replace <code>__</code>

user/plugins/markdown-underline/markdown-underline.php

 <?php
+
 namespace Grav\Plugin;
 
 use Grav\Common\Plugin;
@@ -56,37 +57,53 @@ class MarkdownUnderlinePlugin extends Plugin
     {
         $markdown = $event['markdown'];
 
+        $mu_config = $this->config->get('plugins.markdown-underline');
+
         // Add our parser right before the Emphasis one.
         // See vendor/erusev/parsedown/Parsedown.php#L977
-        $markdown->addInlineType('_', 'Underline', 0);
+        $markdown->addInlineType('_', 'PluginUnderline', 0);
+        $markdown->addInlineType('*', 'PluginUnderline', 0);
 
-        $inlineUnderline = function($Excerpt)
-        {
-            if (strlen($Excerpt['text']) < 5) {
+        $inlineUnderline = function ($Excerpt) use ($mu_config) {
+
+//            if (strlen($Excerpt['text']) < 2) {
+//                return;
+//            }
+            if ( ! isset($Excerpt['text'][1])) {
                 return;
             }
 
             $marker = $Excerpt['text'][0];
 
-            if ($marker !== '_') {
-                return;
+            if ($Excerpt['text'][1] === $marker and preg_match($this->StrongRegex[$marker], $Excerpt['text'], $matches)) {
+                if ($marker === '_') {
+                    $tag = $mu_config['__'];
+                } else {
+                    $tag = $mu_config['**'];
                 }
-
-            if ( ! preg_match($this->StrongRegex[$marker], $Excerpt['text'], $matches)) {
+            } elseif (preg_match($this->EmRegex[$marker], $Excerpt['text'], $matches)) {
+                if ($marker === '_') {
+                    $tag = $mu_config['_'];
+                } else {
+                    $tag = $mu_config['*'];
+                }
+            } else {
                 return;
             }
 
             return array(
                 'extent' => strlen($matches[0]),
                 'element' => array(
-                    'name' => 'u',
+                    'name' => $tag,
                     'handler' => 'line',
                     'text' => $matches[1],
                 ),
             );
+
+
         };
 
-        $markdown->inlineUnderline = $inlineUnderline->bindTo($markdown, $markdown);
+        $markdown->inlinePluginUnderline = $inlineUnderline->bindTo($markdown, $markdown);
     }
 
 }

user/plugins/markdown-underline/markdown-underline.yaml

 enabled: true
-
+"*": em
+"**": strong
+"_": em
+"__": u