Add "ifEqual" Handlebars.js helper

src/mibew/js/source/default/handlebars_helpers.js

@@ -193,4 +193,25 @@
         // All values are "falsy". Render the negative block.
         return options.inverse(this);
     });
+
+    /**
+     * Registers "ifEqual" helper.
+     *
+     * This helper checks if two values are equal or not. Example of usage:
+     * <code>
+     *   {{#ifEqual first second}}
+     *     The first argument is equal to the second one.
+     *   {{else}}
+     *     The arguments are not equal.
+     *   {{/ifEqual}}
+     * </code>
+     */
+    Handlebars.registerHelper('ifEqual', function(left, right, options) {
+        // Not strict equality is used intentionally here.
+        if (left == right) {
+            return options.fn(this);
+        } else {
+            return options.inverse(this);
+        }
+    });
 })(Mibew, Handlebars);

src/tests/client_side/qunit/test_cases/handlebars_helpers_tests.js

@@ -95,3 +95,27 @@ test('ifAny', function() {
         'Test more than one true values'
     );
 });
+
+// Test "ifEqual" Handlebars helper
+test('ifEqual', function() {
+    var template = '{{#ifEqual left right}}true{{else}}false{{/ifEqual}}';
+    var compiledTemplate = Handlebars.compile(template);
+
+    equal(
+        compiledTemplate({left: 12, right: "foo"}),
+        'false',
+        'Test different values'
+    );
+
+    equal(
+        compiledTemplate({left: "10", right: 10}),
+        'true',
+        'Test equal values with different types'
+    );
+
+    equal(
+        compiledTemplate({left: "Bar", right: "Bar"}),
+        'true',
+        'Test equal values'
+    );
+});