streams: Implement copy-subscribers feature.

In the new stream creation modal, added checkboxes for each stream
and a toggle to see or hide the checkboxes. Altered filtering to
filter streams and users. Added corresponding casper tests.

When a stream is checked/unchecked, it does not affect the state
of any user checkbox. This may be visually unclear as users can be
added even if their checkboxes are empty.

Fixes #2448

frontend_tests/casper_tests/05-subscriptions.js

@@ -28,20 +28,38 @@ casper.waitForSelector('.sub_unsub_button.checked', function () {
 
 casper.then(function () {
     casper.test.assertExists('#user-checkboxes [data-name="cordelia@zulip.com"]', 'Original user list contains Cordelia');
-    casper.test.assertExists('#user-checkboxes [data-name="hamlet@zulip.com"]', 'Original user list contains King Hamlet');
+    casper.test.assertExists('#user-checkboxes [data-name="othello@zulip.com"]', 'Original user list contains Othello');
 });
+
+casper.waitForSelector("#copy-from-stream-expand-collapse", function () {
+    casper.click('#copy-from-stream-expand-collapse');
+});
+
+casper.waitUntilVisible("#stream-checkboxes", function () {
+    casper.test.assertExists('#stream-checkboxes [data-name="Scotland"]', 'Original stream list contains Scotland');
+    casper.test.assertExists('#stream-checkboxes [data-name="Rome"]', 'Original stream list contains Rome');
+});
+
 casper.waitForSelector("form#stream_creation_form", function () {
-    casper.test.info("Filtering user list with keyword 'cor'");
+    casper.test.info("Filtering with keyword 'ot'");
-    casper.fill('form#stream_creation_form', {user_list_filter: 'cor'});
+    casper.fill('form#stream_creation_form', {user_list_filter: 'ot'});
 });
 casper.waitForSelector(".subscriber-list", function () {
     casper.test.assertEquals(casper.visible('#user-checkboxes [data-name="cordelia@zulip.com"]'),
-                             true,
-                             "Cordelia is visible"
-    );
-    casper.test.assertEquals(casper.visible('#user-checkboxes [data-name="hamlet@zulip.com"]'),
                              false,
-                             "King Hamlet is not visible"
+                             "Cordelia is not visible"
+    );
+    casper.test.assertEquals(casper.visible('#user-checkboxes [data-name="othello@zulip.com"]'),
+                             true,
+                             "Othello is visible"
+    );
+    casper.test.assertEquals(casper.visible('#stream-checkboxes [data-name="Scotland"]'),
+                             true,
+                             "Scotland is visible"
+    );
+    casper.test.assertEquals(casper.visible('#stream-checkboxes [data-name="Rome"]'),
+                             false,
+                             "Rome is not visible"
     );
 });
 casper.then(function () {
@@ -53,14 +71,25 @@ casper.then(function () {
                              true,
                              "Cordelia is visible again"
     );
-    casper.test.assertEquals(casper.visible('#user-checkboxes [data-name="hamlet@zulip.com"]'),
+    casper.test.assertEquals(casper.visible('#user-checkboxes [data-name="othello@zulip.com"]'),
                              true,
-                             "King Hamlet is visible again"
+                             "Othello is visible again"
+    );
+    casper.test.assertEquals(casper.visible('#stream-checkboxes [data-name="Scotland"]'),
+                             true,
+                             "Scotland is visible again"
+    );
+    casper.test.assertEquals(casper.visible('#stream-checkboxes [data-name="Rome"]'),
+                             true,
+                             "Rome is visible again"
     );
 });
 casper.waitForSelector('#stream_creation_form', function () {
     casper.test.assertTextExists('Add New Stream', 'New stream creation panel');
     casper.fill('form#stream_creation_form', {stream_name: 'Waseemio', stream_description: 'Oimeesaw'});
+    casper.click('input[value="Scotland"] ~ span');
+    casper.click('input[value="cordelia@zulip.com"] ~ span');
+    casper.click('input[value="othello@zulip.com"] ~ span');
     casper.click('form#stream_creation_form button.btn.btn-primary');
 });
 
@@ -73,6 +102,10 @@ casper.then(function () {
     casper.test.info("User should be subscribed to stream Waseemio");
     casper.test.assertSelectorHasText('.stream-name', 'Waseemio');
     casper.test.assertSelectorHasText('.description', 'Oimeesaw');
+    // Based on the selected checkboxes while creating stream,
+    // 4 users from Scotland are added.
+    // 1 user, Cordelia, is added. Othello (subscribed to Scotland) is not added twice.
+    casper.test.assertSelectorHasText('.subscriber-count-text', '5');
     casper.fill('form#add_new_subscription', {stream_name: 'WASeemio'});
     casper.click('#create_stream_button');
 });

static/js/subs.js

@@ -762,7 +762,8 @@ function show_new_stream_modal() {
     $("#stream-creation").removeClass("hide");
     $(".right .settings").hide();
     $('#people_to_add').html(templates.render('new_stream_users', {
-        users: people.get_rest_of_realm()
+        users: people.get_rest_of_realm(),
+        streams: stream_data.get_streams_for_settings_page()
     }));
 
     // Make the options default to the same each time:
@@ -864,10 +865,17 @@ $(function () {
         e.preventDefault();
         update_announce_stream_state();
     });
+    $(document).on('click', '#copy-from-stream-expand-collapse', function (e) {
+        $('#stream-checkboxes').toggle();
+        $("#copy-from-stream-expand-collapse .toggle").toggleClass('icon-vector-caret-right icon-vector-caret-down');
+        e.preventDefault();
+        update_announce_stream_state();
+    });
 
-    // Search People
+    // Search People or Streams
     $(document).on('input', '.add-user-list-filter', function (e) {
         var users = people.get_rest_of_realm();
+        var streams = stream_data.get_streams_for_settings_page();
 
         var user_list = $(".add-user-list-filter");
         if (user_list === 0) {
@@ -877,6 +885,23 @@ $(function () {
         var search_terms = search_term.toLowerCase().split(",");
         var filtered_users = people.filter_people_by_search_terms(users, search_terms);
 
+        _.each(streams, function (stream) {
+            var flag = true;
+
+            flag = flag && (function () {
+                var sub_name = stream.name.toLowerCase();
+                var matches_list = search_terms.indexOf(sub_name) > -1;
+                var matches_last_val = sub_name.match(search_terms[search_terms.length - 1]);
+                return matches_list || matches_last_val;
+            }());
+
+            if (flag) {
+                $("label[data-name='" + stream.name + "']").css("display", "block");
+            } else {
+                $("label[data-name='" + stream.name + "']").css("display", "none");
+            }
+        });
+
         // Hide users which aren't in filtered users
         _.each(users, function (user) {
             var display_type = filtered_users.hasOwnProperty(user.email)? "block" : "none";
@@ -929,6 +954,33 @@ $(function () {
                     return $(elem).val();
                 }
             );
+
+            var checked_streams = _.map(
+                $("#stream_creation_form input:checkbox[name=stream]:checked"),
+                function (elem) {
+                    return $(elem).val();
+                }
+            );
+
+            var checked_stream_emails = [];
+            var stream_emails = [];
+
+            _.each(checked_streams, function (checked_stream) {
+                stream_emails = [];
+                var subscriber_ids = stream_data.get_sub(checked_stream).subscribers.keys();
+                _.each(subscriber_ids, function (subscriber_id) {
+                    stream_emails.push(people.get_person_from_user_id(subscriber_id).email);
+                });
+                checked_stream_emails = _.union(checked_stream_emails, stream_emails);
+            });
+
+            // If a stream was checked and the checkboxes are not visible,
+            // don't add checked streams
+            if ($('#stream-checkboxes').css('display') !== 'none') {
+                principals = _.union(principals, checked_stream_emails);
+            }
+
+
             // You are always subscribed to streams you create.
             principals.push(page_params.email);
 

static/styles/zulip.css

@@ -2113,6 +2113,24 @@ div.floating_recipient {
     float: none;
 }
 
+#stream-checkboxes {
+    margin-top: 10px;
+    display: none;
+}
+
+#stream-checkboxes .checkbox {
+    display: block;
+}
+
+#stream-checkboxes .checkbox input[type=checkbox] {
+    margin: 5px 0px;
+    float: none;
+}
+
+#copy-from-stream-expand-collapse {
+    cursor: pointer;
+}
+
 .streams_popover .sp-container {
     background: white;
     cursor: pointer;

static/templates/new_stream_users.handlebars

@@ -1,7 +1,22 @@
 {{! Client-side Mustache template for rendering users in the stream creation modal.}}
 <a href="#" class="subs_set_all_users">{{t "Check all" }}</a> |
 <a href="#" class="subs_unset_all_users">{{t "Uncheck all" }}</a>
-<input class="add-user-list-filter" name="user_list_filter" type="text" placeholder="{{t "Filter users" }}" />
+<input class="add-user-list-filter" name="user_list_filter" type="text" placeholder="{{t "Filter" }}" />
+<div id="copy-from-stream-expand-collapse" class="add-user-label">
+  <i class="toggle icon-vector-caret-right"></i>
+  <span class="control-label">
+    {{t "Copy from Stream" }}
+  </span>
+</div>
+<div id="stream-checkboxes">
+  {{#each streams}}
+  <label class="checkbox add-user-label" data-name="{{this.name}}">
+    <input type="checkbox" name="stream" value="{{this.name}}" />
+    <span></span>
+    {{this.name}} ( <i class="icon-vector-user"></i> {{this.subscriber_count}})
+  </label>
+  {{/each}}
+</div>
 <div id="user-checkboxes">
   {{#each users}}
   <label class="checkbox add-user-label" data-name="{{this.email}}">