Start some work on adding a pass-through messaging API.

See comments on #29

config/api.json

@@ -0,0 +1 @@
+{}

js/api.js

@@ -0,0 +1,19 @@
+define(["command", "settings!api"], function(command, Settings) {
+  //handles sending custom messages based on Caret commands (builds, plugins, etc)
+  var targets = Settings.get("api");
+  
+  command.on("api:execute", function(id) {
+    if (!id in targets) return;
+    var config = targets[id];
+    chrome.runtime.sendMessage(config.id, config.message);
+  });
+  
+  command.on("init:restart", function() {
+    targets = Settings.get("api");
+  })
+  
+  //External apps can send messages by matching Caret's command/argument config objects
+  chrome.runtime.onMessageExternal.addListener(function(message, sender, c) {
+    command.fire(message.command, message.argument, c);
+  });
+});

js/command.js

@@ -8,11 +8,12 @@ define(["dom2"], function() {
   
   var commands = {};
   
-  var fire = function(command, argument) {
+  //commands can pass a callback, although most don't respond that way
+  var fire = function(command, argument, callback) {
     if (!commands[command]) return;
     var registry = commands[command].slice();
     registry.forEach(function(entry) {
-        entry.callback.apply(entry.scope || null, argument instanceof Array ? argument : [argument] );
+        entry.callback.apply(entry.scope || null, argument instanceof Array ? argument : [argument], callback);
     });
   }
   

js/main.js

@@ -6,7 +6,8 @@ require([
   "keys",
   "fileManager",
   "menus",
-  "palette"
+  "palette",
+  "api"
   ], function(command, Settings, dialog) {
   
   var frame = chrome.app.window.current();