autolinks system tiddlers

enhanced extlink parser to cover system tiddler links

of course, only those without spaces in their title

didn't want to open up an extra parser for this as extlink has all the
basics

core/modules/parsers/wikiparser/rules/extlink.js

@@ -3,16 +3,20 @@ title: $:/core/modules/parsers/wikiparser/rules/extlink.js
 type: application/javascript
 module-type: wikirule
 
-Wiki text inline rule for external links. For example:
+Wiki text inline rule for external links and system tiddler links.
+Can be suppressed preceding them with `~`.
 
 ```
-An external link: http://www.tiddlywiki.com/
+; system tiddler
+: $:/config
 
-A suppressed external link: ~http://www.tiddlyspace.com/
+; external link
+: http://www.tiddlywiki.com/
+
+; suppressed external link
+: ~http://www.tiddlyspace.com/
 ```
 
-External links can be suppressed by preceding them with `~`.
-
 \*/
 (function(){
 
@@ -26,29 +30,41 @@ exports.types = {inline: true};
 exports.init = function(parser) {
 	this.parser = parser;
 	// Regexp to match
-	this.matchRegExp = /~?(?:file|http|https|mailto|ftp|irc|news|data|skype):[^\s<>{}\[\]`|'"\\^~]+(?:\/|\b)/mg;
+	this.matchRegExp = /~?(?:\$|file|http|https|mailto|ftp|irc|news|data|skype):[^\s<>{}\[\]`|'"\\^~]+(?:\/|\b)/mg;
 };
 
 exports.parse = function() {
+	var match = this.match[0];
 	// Move past the match
 	this.parser.pos = this.matchRegExp.lastIndex;
 	// Create the link unless it is suppressed
-	if(this.match[0].substr(0,1) === "~") {
+	if(match.substr(0,1) === "~") {
-		return [{type: "text", text: this.match[0].substr(1)}];
+		return [{type: "text", text: match.substr(1)}];
+	} else if(match.substr(0,1) === "$") {
+		return [{
+			type: "link",
+			attributes: {
+				to: {type: "string", value: match}
+			},
+			children: [{
+				type: "text",
+				text: match
+			}]
+		}];
 	} else {
 		return [{
 			type: "element",
 			tag: "a",
 			attributes: {
-				href: {type: "string", value: this.match[0]},
+				href: {type: "string", value: match},
 				"class": {type: "string", value: "tc-tiddlylink-external"},
 				target: {type: "string", value: "_blank"}
 			},
 			children: [{
-				type: "text", text: this.match[0]
+				type: "text", text: match
 			}]
 		}];
 	}
 };
 
-})();
+})();