From e79e74ade4e68f2e6abbc3ca7aab9988eef85ee7 Mon Sep 17 00:00:00 2001
From: Steve Howell <steve@zulip.com>
Date: Wed, 18 Sep 2013 13:27:12 -0400
Subject: [PATCH] Add narrowed_to_topic() helper function.

(imported from commit 9190caa9b183893fb7ae883686b9bdbd661d5895)
---
 static/js/narrow.js                  | 8 ++++++++
 zerver/tests/frontend/node/narrow.js | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/static/js/narrow.js b/static/js/narrow.js
index 49777b170b..676d8e0107 100644
--- a/static/js/narrow.js
+++ b/static/js/narrow.js
@@ -435,6 +435,14 @@ exports.narrowed_by_reply = function () {
              current_filter.operands("topic").length === 1));
 };
 
+exports.narrowed_to_topic = function () {
+    if (current_filter === undefined) {
+        return false;
+    }
+    return (current_filter.has_operator("stream") &&
+            current_filter.has_operator("topic"));
+};
+
 exports.narrowed_to_search = function () {
     return (current_filter !== undefined) && current_filter.is_search();
 };
diff --git a/zerver/tests/frontend/node/narrow.js b/zerver/tests/frontend/node/narrow.js
index a360dae604..eef883aafe 100644
--- a/zerver/tests/frontend/node/narrow.js
+++ b/zerver/tests/frontend/node/narrow.js
@@ -27,26 +27,31 @@ function set_filter(operators) {
     assert(!narrow.narrowed_to_pms());
     assert(!narrow.narrowed_by_reply());
     assert(!narrow.narrowed_to_search());
+    assert(!narrow.narrowed_to_topic());
 
     set_filter([['stream', 'Foo']]);
     assert(!narrow.narrowed_to_pms());
     assert(!narrow.narrowed_by_reply());
     assert(!narrow.narrowed_to_search());
+    assert(!narrow.narrowed_to_topic());
 
     set_filter([['pm-with', 'steve@zulip.com']]);
     assert(narrow.narrowed_to_pms());
     assert(narrow.narrowed_by_reply());
     assert(!narrow.narrowed_to_search());
+    assert(!narrow.narrowed_to_topic());
 
     set_filter([['stream', 'Foo'], ['topic', 'bar']]);
     assert(!narrow.narrowed_to_pms());
     assert(narrow.narrowed_by_reply());
     assert(!narrow.narrowed_to_search());
+    assert(narrow.narrowed_to_topic());
 
     set_filter([['search', 'grail']]);
     assert(!narrow.narrowed_to_pms());
     assert(!narrow.narrowed_by_reply());
     assert(narrow.narrowed_to_search());
+    assert(!narrow.narrowed_to_topic());
 }());
 
 (function test_operators() {