allow canceling commands in multi_select mode

lib/ace/ext/emmet.js

@@ -339,7 +339,8 @@ for (var command in keymap) {
         name: "emmet:" + command,
         action: command,
         bindKey: keymap[command],
-        exec: runEmmetCommand
+        exec: runEmmetCommand,
+        multiSelectAction: "forEach"
     });
 }
 

lib/ace/lib/event_emitter.js

@@ -85,12 +85,37 @@ EventEmitter.once = function(eventName, callback) {
 
 
 EventEmitter.setDefaultHandler = function(eventName, callback) {
-    this._defaultHandlers = this._defaultHandlers || {};
+    var handlers = this._defaultHandlers
+    if (!handlers)
+        handlers = this._defaultHandlers = {_disabled_: {}};
     
-    if (this._defaultHandlers[eventName])
-        throw new Error("The default handler for '" + eventName + "' is already set");
-        
-    this._defaultHandlers[eventName] = callback;
+    if (handlers[eventName]) {
+        var old = handlers[eventName];
+        var disabled = handlers._disabled_[eventName];
+        if (!disabled)
+            handlers._disabled_[eventName] = disabled = [];
+        disabled.push(old);
+        var i = disabled.indexOf(callback);
+        if (i != -1) 
+            disabled.splice(i, 1);
+    }
+    handlers[eventName] = callback;
+};
+EventEmitter.removeDefaultHandler = function(eventName, callback) {
+    var handlers = this._defaultHandlers
+    if (!handlers)
+        return;
+    var disabled = handlers._disabled_[eventName];
+    
+    if (handlers[eventName] == callback) {
+        var old = handlers[eventName];
+        if (disabled)
+            this.setDefaultHandler(eventName, disabled.pop());
+    } else if (disabled) {
+        var i = disabled.indexOf(callback);
+        if (i != -1)
+            disabled.splice(i, 1);
+    }
 };
 
 EventEmitter.on =

lib/ace/multi_select.js

@@ -420,7 +420,7 @@ var Editor = require("./editor").Editor;
 
         this.setStyle("ace_multiselect");
         this.keyBinding.addKeyboardHandler(commands.keyboardHandler);
-        this.commands.on("exec", this.$onMultiSelectExec);
+        this.commands.setDefaultHandler("exec", this.$onMultiSelectExec);
 
         this.renderer.updateCursor();
         this.renderer.updateBackMarkers();
@@ -434,7 +434,7 @@ var Editor = require("./editor").Editor;
         this.unsetStyle("ace_multiselect");
         this.keyBinding.removeKeyboardHandler(commands.keyboardHandler);
 
-        this.commands.removeEventListener("exec", this.$onMultiSelectExec);
+        this.commands.removeDefaultHandler("exec", this.$onMultiSelectExec);
         this.renderer.updateCursor();
         this.renderer.updateBackMarkers();
     };
@@ -445,20 +445,20 @@ var Editor = require("./editor").Editor;
         if (!editor.multiSelect)
             return;
         if (!command.multiSelectAction) {
-            command.exec(editor, e.args || {});
+            var result = command.exec(editor, e.args || {});
             editor.multiSelect.addRange(editor.multiSelect.toOrientedRange());
             editor.multiSelect.mergeOverlappingRanges();
         } else if (command.multiSelectAction == "forEach") {
-            editor.forEachSelection(command, e.args);
+            result = editor.forEachSelection(command, e.args);
         } else if (command.multiSelectAction == "forEachLine") {
-            editor.forEachSelection(command, e.args, true);
+            result = editor.forEachSelection(command, e.args, true);
         } else if (command.multiSelectAction == "single") {
             editor.exitMultiSelectMode();
-            command.exec(editor, e.args || {});
+            result = command.exec(editor, e.args || {});
         } else {
-            command.multiSelectAction(editor, e.args || {});
+            result = command.multiSelectAction(editor, e.args || {});
         }
-        e.preventDefault();
+        return result;
     };
 
     /** 
@@ -474,7 +474,8 @@ var Editor = require("./editor").Editor;
         var session = this.session;
         var selection = this.selection;
         var rangeList = selection.rangeList;
-
+        var result;
+        
         var reg = selection._eventRegistry;
         selection._eventRegistry = {};
 
@@ -487,7 +488,9 @@ var Editor = require("./editor").Editor;
             }
             tmpSel.fromOrientedRange(rangeList.ranges[i]);
             this.selection = session.selection = tmpSel;
-            cmd.exec(this, args || {});
+            var cmdResult = cmd.exec(this, args || {});
+            if (!result == undefined)
+                result = cmdResult;
             tmpSel.toOrientedRange(rangeList.ranges[i]);
         }
         tmpSel.detach();
@@ -499,6 +502,7 @@ var Editor = require("./editor").Editor;
 
         this.onCursorChange();
         this.onSelectionChange();
+        return result;
     };
 
     /** 

lib/ace/snippets.js

@@ -760,8 +760,7 @@ var TabstopManager = function(editor) {
         "Esc": function(ed) {
             ed.tabstopManager.detach();
         },
-        // todo multiselectExec doesn't handle command return values
-        "!Return": function(ed) {
+        "Return": function(ed) {
             //ed.tabstopManager.tabNext(1);
             return false;
         }