From 8626276dc3f59cd3c1604e5964e7e0bfcafe969b Mon Sep 17 00:00:00 2001
From: Steve Howell <steve@zulip.com>
Date: Mon, 9 Sep 2013 14:33:25 -0400
Subject: [PATCH] Add muting.unmute_topic

(imported from commit c3aa08b7d50c70cba86b43c12d618ba1d96832b4)
---
 static/js/muting.js                  |  7 +++++++
 zerver/tests/frontend/node/muting.js | 12 ++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/static/js/muting.js b/static/js/muting.js
index 19531fcee3..49161225e7 100644
--- a/static/js/muting.js
+++ b/static/js/muting.js
@@ -13,6 +13,13 @@ exports.mute_topic = function (stream, topic) {
     sub_dict.set(topic, true);
 };
 
+exports.unmute_topic = function (stream, topic) {
+    var sub_dict = muted_topics.get(stream);
+    if (sub_dict) {
+        sub_dict.del(topic);
+    }
+};
+
 exports.is_topic_muted = function (stream, topic) {
     var sub_dict = muted_topics.get(stream);
     return sub_dict && sub_dict.get(topic);
diff --git a/zerver/tests/frontend/node/muting.js b/zerver/tests/frontend/node/muting.js
index 1415424dcf..7aa58153ec 100644
--- a/zerver/tests/frontend/node/muting.js
+++ b/zerver/tests/frontend/node/muting.js
@@ -19,4 +19,16 @@ var muting = require('js/muting.js');
     // test idempotentcy
     muting.mute_topic('devel', 'java');
     assert(muting.is_topic_muted('devel', 'java'));
+
+    muting.unmute_topic('devel', 'java');
+    assert(!muting.is_topic_muted('devel', 'java'));
+
+    // test idempotentcy
+    muting.unmute_topic('devel', 'java');
+    assert(!muting.is_topic_muted('devel', 'java'));
+
+    // test unknown stream is harmless too
+    muting.unmute_topic('unknown', 'java');
+    assert(!muting.is_topic_muted('unknown', 'java'));
+
 }());