add commands

- remove to line start
 - remove word left
 - remove word right

lib/ace/commands/default_commands.js

@@ -242,10 +242,22 @@ canon.addCommand({
     name: "backspace",
     exec: function(env, args, request) { env.editor.removeLeft(); }
 });
+canon.addCommand({
+    name: "removetolinestart",
+    exec: function(env, args, request) { env.editor.removeToLineStart(); }
+});
 canon.addCommand({
     name: "removetolineend",
     exec: function(env, args, request) { env.editor.removeToLineEnd(); }
 });
+canon.addCommand({
+    name: "removewordleft",
+    exec: function(env, args, request) { env.editor.removeWordLeft(); }
+});
+canon.addCommand({
+    name: "removewordright",
+    exec: function(env, args, request) { env.editor.removeWordRight(); }
+});
 canon.addCommand({
     name: "outdent",
     exec: function(env, args, request) { env.editor.blockOutdent(); }

lib/ace/editor.js

@@ -567,6 +567,39 @@ var Editor =function(renderer, session) {
         this.clearSelection();
     };
     
+    this.removeWordRight = function() {
+        if (this.$readOnly)
+            return;
+
+        if (this.selection.isEmpty())
+            this.selection.selectWordRight();
+
+        this.session.remove(this.getSelectionRange());
+        this.clearSelection();
+    };
+    
+    this.removeWordLeft = function() {
+        if (this.$readOnly)
+            return;
+
+        if (this.selection.isEmpty())
+            this.selection.selectWordLeft();
+
+        this.session.remove(this.getSelectionRange());
+        this.clearSelection();
+    };
+    
+    this.removeToLineStart = function() {
+        if (this.$readOnly)
+            return;
+
+        if (this.selection.isEmpty())
+            this.selection.selectLineStart();
+
+        this.session.remove(this.getSelectionRange());
+        this.clearSelection();
+    };
+    
     this.removeToLineEnd = function() {
         if (this.$readOnly)
             return;