Make :rehash|echomsg "foo" work as expected.

--HG--
branch : groups

common/content/autocommands.js

@@ -78,7 +78,7 @@ var AutoCommands = Module("autocommands", {
 
     hives: Group.SubGroup("autocmd", AutoCmdHive),
 
-    get activeHives() contexts.activeGroups("autocmd").map(function (h) h.autocmd),
+    get activeHives() contexts.activeGroups("autocmd").map(function (h) h.autocmd).filter(function (h) h._store.length),
 
     add: deprecated("autocommand.user.add", { get: function add() autocommands.user.closure.add }),
     get: deprecated("autocommand.user.get", { get: function get() autocommands.user.closure.get }),

common/content/commands.js

@@ -1090,6 +1090,8 @@ var Commands = Module("commands", {
             args.commandString = str.substr(0, len) + args.string;
             str = args.trailing;
             yield [command, args];
+            if (args.break)
+                break;
         }
         while (str);
     },

common/content/dactyl.js

@@ -1791,7 +1791,12 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
 
         commands.add(["reh[ash]"],
             "Reload the " + config.appName + " add-on",
-            function (args) { util.rehash(args); },
+            function (args) {
+                if (args.trailing)
+                    JSMLoader.rehashCmd = args.trailing; // Hack.
+                args.break = true;
+                util.rehash(args);
+            },
             {
                 argCount: "0",
                 options: [
@@ -2117,6 +2122,10 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
                     dactyl.execute(cmd);
                 });
 
+            if (JSMLoader.rehashCmd)
+                dactyl.execute(JSMLoader.rehashCmd);
+            JSMLoader.rehashCmd = null;
+
             dactyl.fullyInitialized = true;
             dactyl.triggerObserver("enter", null);
             autocommands.trigger("Enter", {});