Implement /join

src/SlashCommands.js

@@ -61,15 +61,48 @@ var commands = {
             var matches = args.match(/^(\S+)$/);
             if (matches) {
                 var room_alias = matches[1];
-                // TODO: 
-                // Map alias to room ID
-                // Find the room (if joined, then just view the room)
-                // else join the room alias
-                /*
+                // Try to find a room with this alias
+                var rooms = MatrixClientPeg.get().getRooms();
+                var roomId;
+                for (var i = 0; i < rooms.length; i++) {
+                    var aliasEvents = rooms[i].currentState.getStateEvents(
+                        "m.room.aliases"
+                    );
+                    for (var j = 0; j < aliasEvents.length; j++) {
+                        var aliases = aliasEvents[j].getContent().aliases || [];
+                        for (var k = 0; k < aliases.length; k++) {
+                            if (aliases[k] === room_alias) {
+                                roomId = rooms[i].roomId;
+                                break;
+                            }
+                        }
+                        if (roomId) { break; }
+                    }
+                    if (roomId) { break; }
+                }
+                if (roomId) { // we've already joined this room, view it.
                     dis.dispatch({
                         action: 'view_room',
                         room_id: roomId
-                }); */
+                    });
+                    return success();
+                }
+                else {
+                    // attempt to join this alias.
+                    return success(
+                        MatrixClientPeg.get().joinRoom(room_alias).done(
+                        function(room) {
+                            dis.dispatch({
+                                action: 'view_room',
+                                room_id: room.roomId
+                            });
+                        }, function(err) {
+                            console.error(
+                                "Failed to join room: %s", JSON.stringify(err)
+                            );
+                        })
+                    );
+                }
             }
         }
         return reject("Usage: /join <room_alias> [NOT IMPLEMENTED]");

src/controllers/molecules/MessageComposer.js

@@ -176,18 +176,19 @@ module.exports = {
         var cmd = SlashCommands.processInput(this.props.room.roomId, contentText);
         if (cmd) {
             ev.preventDefault();
+            if (!cmd.error) {
+                this.refs.textarea.getDOMNode().value = '';
+            }
             if (cmd.promise) {
                 cmd.promise.done(function() {
                     console.log("Command success.");
                 }, function(err) {
                     console.error("Command failure: %s", err);
                 });
-                this.refs.textarea.getDOMNode().value = '';
             }
             else if (cmd.error) {
                 console.error(cmd.error);
             }
-
             return;
         }