room, user, ddg autocomplete providers (wip)

src/autocomplete/UserProvider.js

@@ -0,0 +1,31 @@
+import AutocompleteProvider from './AutocompleteProvider';
+import Q from 'q';
+import MatrixClientPeg from '../MatrixClientPeg';
+
+const ROOM_REGEX = /@[^\s]*/g;
+
+export default class UserProvider extends AutocompleteProvider {
+    constructor() {
+        super();
+    }
+
+    getCompletions(query: String) {
+        let client = MatrixClientPeg.get();
+        let completions = [];
+        const matches = query.match(ROOM_REGEX);
+        if(!!matches) {
+            const command = matches[0];
+            completions = client.getUsers().map(user => {
+                return {
+                    title: user.displayName,
+                    description: user.userId
+                };
+            });
+        }
+        return Q.when(completions);
+    }
+
+    getName() {
+        return 'Users';
+    }
+}