notes@schorschii: Add basic markdown support (#1761)

* Closes #1681

Author: KopfdesDaemons

notes@schorschii/README.md

@@ -1,5 +1,44 @@
-# Note Desklet
-
-## Contributions
-- code and first themes by _schorschii_
-- many new note themes and logo by _Niki_
+# Note Desklet
+
+## Basic markdown support
+
+1. Headlines
+
+    Write headlines like this:
+    ```
+    # Headline 1
+    ## Headline 2
+    ### Headline 3
+    #### Headline 4
+    ##### Headline 5
+    ###### Headline 6
+    ```
+2. Bold text
+
+    Write **bold text** like this:
+    ```
+    **text**
+    ```
+
+3. Italic text
+
+    Write *italic text* like this:
+    ```
+    *text*
+    ```
+4. Strikethrough text
+
+    Write ~~strikethrough~~ text like this:
+    ```
+    ~~text~~
+    ```
+5. Monospace text
+
+    Write `monospace` text like this:
+    ```
+    `text`
+    ```
+
+## Contributions
+- code and first themes by _schorschii_
+- many new note themes and logo by _Niki_

notes@schorschii/files/notes@schorschii/desklet.js

@@ -290,9 +290,15 @@ MyDesklet.prototype = {
 			//Main.notifyError("Complete Refresh Done", " "); // debug
 		}
 
+		// parse markdown
+		this.notecontent =  this.parseMarkdown(this.notecontent);
+
 		// set the raw text
 		this.notetext.set_text(this.notecontent);
 
+		// enable markup to support markdown
+		this.notetext.clutter_text.set_use_markup(true);
+
 		// grab the Clutter.Text layout
 		let ct = this.notetext.get_clutter_text();
 
@@ -307,6 +313,27 @@ MyDesklet.prototype = {
 		//Main.notifyError("Text Refresh Done", " "); // debug
 	},
 
+	parseMarkdown: function(text) {
+		// bold by **text**
+		text = text.replace(/\*\*(.*?)\*\*/g, '<b>$1</b>');
+		// italic by *text*
+		text = text.replace(/\*(.*?)\*/g, '<i>$1</i>');
+		// strikethrough by ~~text~~
+		text = text.replace(/~~(.*?)~~/g, '<s>$1</s>');
+		// monospace by `text`
+		text = text.replace(/`(.*?)`/g, '<tt>$1</tt>');
+
+		// headlines
+		text = text.replace(/^# (.*)$/gm, '<span size="150%"><b>$1</b></span>');
+		text = text.replace(/^## (.*)$/gm, '<span size="130%"><b>$1</b></span>');
+		text = text.replace(/^### (.*)$/gm, '<span size="110%"><b>$1</b></span>');
+		text = text.replace(/^#### (.*)$/gm, '<span size="90%"><b>$1</b></span>');
+		text = text.replace(/^##### (.*)$/gm, '<span size="70%"><b>$1</b></span>');
+		text = text.replace(/^###### (.*)$/gm, '<span size="50%"><b>$1</b></span>');
+
+		return text;
+	},
+
 	refreshDecoration: function() {
 		// desklet label (header)
 		if(this.useCustomLabel == true)