update syntax highlight after editing (#210), move markdown and highlight scripts from lib to plugin

plugin/markdown/markdown.js

@@ -0,0 +1,32 @@
+// From https://gist.github.com/1343518
+// Modified by Hakim to handle Markdown indented with tabs
+(function(){
+
+    if( typeof Showdown === 'undefined' ) {
+        throw 'The reveal.js Markdown plugin requires Showdown to be loaded';
+    }
+
+    var sections = document.querySelectorAll( '[data-markdown]' );
+
+    for( var i = 0, len = sections.length; i < len; i++ ) {
+        var section = sections[i];
+
+        var template = section.querySelector( 'script' );
+
+        // strip leading whitespace so it isn't evaluated as code
+        var text = ( template || section ).innerHTML;
+
+        var leadingWs = text.match(/^\n?(\s*)/)[1].length,
+            leadingTabs = text.match(/^\n?(\t*)/)[1].length;
+
+        if( leadingTabs > 0 ) {
+            text = text.replace( new RegExp('\\n?\\t{' + leadingTabs + '}','g'), '\n' );
+        }
+        else if( leadingWs > 1 ) {
+            text = text.replace( new RegExp('\\n? {' + leadingWs + '}','g'), '\n' );
+        }
+
+        section.innerHTML = (new Showdown.converter()).makeHtml(text);
+    }
+
+})();