Move stream-related uri helpers to hash_util.

This allows several modules to no longer need
to import `narrow` (or, in our current pre-import
world, to not have to use that global).

The broken dependencies are reflected in the node
tests, which should now run slightly faster.

frontend_tests/node_tests/stream_data.js

@@ -10,7 +10,6 @@ set_global('blueslip', global.make_zblueslip());
 
 zrequire('util');
 zrequire('hash_util');
-zrequire('narrow');
 zrequire('topic_data');
 zrequire('people');
 zrequire('stream_color');

frontend_tests/node_tests/stream_list.js

@@ -11,7 +11,6 @@ zrequire('stream_sort');
 zrequire('colorspace');
 zrequire('stream_color');
 zrequire('hash_util');
-zrequire('narrow');
 zrequire('unread');
 zrequire('stream_data');
 zrequire('scroll_util');

frontend_tests/node_tests/topic_list.js

@@ -9,7 +9,6 @@ set_global('stream_popover', {});
 set_global('templates', {});
 
 zrequire('hash_util');
-zrequire('narrow');
 zrequire('stream_data');
 zrequire('unread');
 zrequire('topic_data');

static/js/hash_util.js

@@ -55,6 +55,16 @@ exports.decode_operand = function (operator, operand) {
     return operand;
 };
 
+exports.by_stream_uri = function (stream) {
+    return "#narrow/stream/" + exports.encode_stream_name(stream);
+};
+
+exports.by_stream_subject_uri = function (stream, subject) {
+    return "#narrow/stream/" + exports.encode_stream_name(stream) +
+           "/subject/" + exports.encodeHashComponent(subject);
+};
+
+
 return exports;
 
 }());

static/js/message_list_view.js

@@ -232,9 +232,10 @@ MessageListView.prototype = {
 
                 if (message_container.msg.stream) {
                     message_container.stream_url =
-                        narrow.by_stream_uri(message_container.msg.stream);
+                        hash_util.by_stream_uri(message_container.msg.stream);
                     message_container.topic_url =
-                        narrow.by_stream_subject_uri(message_container.msg.stream,
+                        hash_util.by_stream_subject_uri(
+                            message_container.msg.stream,
                             message_container.msg.subject);
                 } else {
                     message_container.pm_with_url =

static/js/narrow.js

@@ -787,15 +787,6 @@ exports.by_sender_uri = function (reply_to) {
     ]);
 };
 
-exports.by_stream_uri = function (stream) {
-    return "#narrow/stream/" + hash_util.encode_stream_name(stream);
-};
-
-exports.by_stream_subject_uri = function (stream, subject) {
-    return "#narrow/stream/" + hash_util.encode_stream_name(stream) +
-           "/subject/" + hash_util.encodeHashComponent(subject);
-};
-
 exports.by_conversation_and_time_uri = function (message, is_absolute_url) {
     var absolute_url = "";
     if (is_absolute_url) {

static/js/stream_data.js

@@ -228,7 +228,7 @@ exports.update_calculated_fields = function (sub) {
         !sub.invite_only || sub.subscribed);
     // User can add other users to stream if stream is public or user is subscribed to stream.
     sub.can_access_subscribers = !sub.invite_only || sub.subscribed || page_params.is_admin;
-    sub.preview_url = narrow.by_stream_uri(sub.name);
+    sub.preview_url = hash_util.by_stream_uri(sub.name);
     exports.render_stream_description(sub);
     exports.update_subscribers_count(sub);
 };

static/js/stream_list.js

@@ -220,7 +220,7 @@ function build_stream_sidebar_li(sub) {
     var args = {
         name: name,
         id: sub.stream_id,
-        uri: narrow.by_stream_uri(name),
+        uri: hash_util.by_stream_uri(name),
         not_in_home_view: stream_data.in_home_view(sub.stream_id) === false,
         invite_only: sub.invite_only,
         color: stream_data.get_color(name),

static/js/topic_list.js

@@ -87,7 +87,7 @@ exports.widget = function (parent_elem, my_stream_id) {
                 unread: num_unread,
                 is_zero: num_unread === 0,
                 is_muted: muting.is_topic_muted(my_stream_name, topic_name),
-                url: narrow.by_stream_subject_uri(my_stream_name, topic_name),
+                url: hash_util.by_stream_subject_uri(my_stream_name, topic_name),
             };
             var li = $(templates.render('topic_list_item', topic_info));
             self.topic_items.set(topic_name, li);