integrate github improvements

source: http://github.com/github/github-flavored-markdown

showdown.js

@@ -149,6 +149,18 @@ this.makeHtml = function(text) {
 	// attacklab: Restore tildes
 	text = text.replace(/~T/g,"~");
 
+        // ** GFM **  Auto-link URLs and emails
+        text = text.replace(/https?\:\/\/[^"\s\<\>]*[^.,;'">\:\s\<\>\)\]\!]/g, function(wholeMatch){
+            var left = RegExp.leftContext
+            var right = RegExp.rightContext
+            if (left.match(/<[^>]+$/) && right.match(/^[^>]*>/)) {return wholeMatch}
+            return "<a href='" + wholeMatch + "'>" + wholeMatch + "</a>";
+        });
+        text = text.replace(/[a-z0-9_\-+=.]+@[a-z0-9\-]+(\.[a-z0-9-]+)+/ig, function(wholeMatch){
+            return "<a href='mailto:" + wholeMatch + "'>" + wholeMatch + "</a>";
+        });
+
+
 	return text;
 }
 
@@ -351,8 +363,8 @@ var _RunBlockGamut = function(text) {
 	// Do Horizontal Rules:
 	var key = hashBlock("<hr />");
 	text = text.replace(/^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$/gm,key);
-	text = text.replace(/^[ ]{0,2}([ ]?-[ ]?){3,}[ \t]*$/gm,key);
-	text = text.replace(/^[ ]{0,2}([ ]?_[ ]?){3,}[ \t]*$/gm,key);
+	text = text.replace(/^[ ]{0,2}([ ]?\-[ ]?){3,}[ \t]*$/gm,key);
+	text = text.replace(/^[ ]{0,2}([ ]?\_[ ]?){3,}[ \t]*$/gm,key);
 
 	text = _DoLists(text);
 	text = _DoCodeBlocks(text);
@@ -978,9 +990,11 @@ var _EncodeCode = function(text) {
 var _DoItalicsAndBold = function(text) {
 
 	// <strong> must go first:
-	text = text.replace(/(\*\*|__)(?=\S)([^\r]*?\S[\*_]*)\1/g,
+	text = text.replace(/(\*\*|__)(?=\S)([^\r]*?\S[*_]*)\1/g,
 		"<strong>$2</strong>");
 
+        text = text.replace(/(\w)_(\w)/g, "$1~E95E$2") // ** GFM **  "~E95E" == escaped "_"
+
 	text = text.replace(/(\*|_)(?=\S)([^\r]*?\S)\1/g,
 		"<em>$2</em>");
 
@@ -1062,6 +1076,7 @@ var _FormParagraphs = function(text) {
 		}
 		else if (str.search(/\S/) >= 0) {
 			str = _RunSpanGamut(str);
+                        str = str.replace(/\n/g,"<br />");  // ** GFM **
 			str = str.replace(/^([ \t]*)/g,"<p>");
 			str += "</p>"
 			grafsOut.push(str);
@@ -1303,4 +1318,4 @@ var Showdown = Attacklab.showdown;
 // If anyone's interested, tell the world that this file's been loaded
 if (Attacklab.fileLoaded) {
 	Attacklab.fileLoaded("showdown.js");
-}
+}