much better handling of file extensions. defaults attachments to a .js file if no extension entered.

.gitignore

@@ -19,3 +19,4 @@ settings_local.py
 .coverage
 .figleaf
 vendor
+*.pyc

media/jetpack/js/FileTree.js

@@ -139,12 +139,12 @@ FileTree = new Class({
 			this.renameBranch(element);
 		}.bind(this))
 		
-		hasExtension = hasExtension || (text.indexOf('.') >= 0);
+		hasExtension = hasExtension || !!text.getFileExtension();
 		
 		var range = document.createRange(),
 			node = label.firstChild;
 		range.setStart(node, 0);
-		range.setEnd(node, hasExtension ? text.split('.')[0].length : text.length);
+		range.setEnd(node, hasExtension ? text.length - text.getFileExtension().length -1 : text.length);
 		sel = window.getSelection();
 		sel.removeAllRanges();
 		sel.addRange(range);
@@ -234,3 +234,16 @@ FileTree.Collapse = new Class({
 	}
 	
 });
+
+String.implement('getFileExtension', function() {
+    var parts = this.split('.'),
+        ext = parts.pop(),
+        filename = parts.join('.');
+        
+    return !!filename && !!ext && !ext.match(/[^a-zA-Z0-9]/) && ext;
+});
+
+String.implement('getFileName', function() {
+    var ext = this.getFileExtension();
+    return ext && this.substring(0, this.length - ext.length - 1);
+});

media/jetpack/js/Package.js

@@ -749,11 +749,9 @@ Package.Edit = new Class({
 		var that = this;
 		
 		// break off an extension from the filename
-		var ext = newName.match(/\.([^\.]+$)/);
-		if (ext) {
-		    ext = ext[1];
-		    newName = newName.substring(0, ext.length);
-		}
+		var ext = newName.getFileExtension();
+		newName = newName.getFileName();
+		
 		
 		
 		new Request.JSON({

media/jetpack/js/Sidebar.js

@@ -471,10 +471,10 @@ var Sidebar = new Class({
 				}
 				
 				for (var f = 0; f < files.length; f++){
-					var fname = files[f].fileName.replace(/\.[^\.]+$/g, ''),
-						ext = files[f].fileName.match(/\.([^\.]+)$/)[1];
+					var fname = files[f].fileName.getFileName(),
+						ex = files[f].fileName.getFileExtension();
 						
-					if (Attachment.exists(fname, ext)) {
+					if (Attachment.exists(fname, ex)) {
 						fd.error.alert('Filename has to be unique', 'You already have an attachment with that name.');
 						return;
 					}
@@ -508,6 +508,12 @@ var Sidebar = new Class({
 				    filename = filename.replace(/[^a-zA-Z0-9\-_\/\.]+/g, '-');
 				    filename = filename.replace(/\/{2,}/g, '/');
 				    filename = filename.replace(/\/*$/g, ''); /* */
+				    
+				    
+				    if (!isFolder && !filename.getFileExtension()) {
+				        
+				        filename = filename.replace(/\./, '') + '.js'; //we're defaulting to .js files if the user doesnt enter an extension
+				    }
 				}
 				
 				if(files.length) {