buddy list: Extract buddy_list.js.

static/js/buddy_list.js

@@ -0,0 +1,50 @@
+var buddy_list = (function () {
+    var self = {};
+
+    self.populate = function (opts) {
+        var user_info = opts.items;
+
+        var html = templates.render('user_presence_rows', {users: user_info});
+        $('#user_presences').html(html);
+    };
+
+    self.find_li = function (opts) {
+        var user_id = opts.key;
+        return $("li.user_sidebar_entry[data-user-id='" + user_id + "']");
+    };
+
+    self.insert_or_move = function (opts) {
+        var user_id = opts.key;
+        var info = opts.item;
+        var compare_function = opts.compare_function;
+
+        $('#user_presences').find('[data-user-id="' + user_id + '"]').remove();
+        var html = templates.render('user_presence_row', info);
+
+        var items = $('#user_presences li').toArray();
+
+        function insert() {
+            var i = 0;
+
+            for (i = 0; i < items.length; i += 1) {
+                var li = $(items[i]);
+                var list_user_id = li.attr('data-user-id');
+                if (compare_function(user_id, list_user_id) < 0) {
+                    li.before(html);
+                    return;
+                }
+            }
+
+            $('#user_presences').append(html);
+        }
+
+        insert();
+    };
+
+    return self;
+}());
+
+if (typeof module !== 'undefined') {
+    module.exports = buddy_list;
+}
+