Add placeholders to HBS.js "l10n" helper

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

@@ -55,10 +55,23 @@
     /**
      * Register 'l10n' Handlebars helper
      *
-     * This helper returns translated string with specified key
+     * This helper returns translated string with specified key. Example of usage:
+     * <code>
+     *   {{l10n "localization.string" arg1 arg2 arg3}}
+     * </code>
+     * where:
+     *   - "localization.string" is localization constant.
+     *   - arg* are arguments that will be passed to getlocal function. There
+     *     can be arbitrary number of such arguments.
      */
-    Handlebars.registerHelper('l10n', function(key) {
+    Handlebars.registerHelper('l10n', function() {
-        return (Mibew.Localization.trans(key) || '');
+        var key = arguments[0],
+            placeholders = Array.prototype.slice.call(arguments, 1),
+            localized = (Mibew.Localization.trans(key) || '');
+
+        return localized.replace(/\{([0-9]+)\}/g, function(match, index) {
+            return placeholders[parseInt(index)] || '';
+        });
     });
 
     /**

src/tests/client_side/qunit/index.html

@@ -22,9 +22,11 @@
         <!-- End of the mibew_api.js tests -->
 
         <!-- Start of Handlebars' helpers tests -->
-        <script type="text/javascript" src="/mibew/js/libs/handlebars.js"></script>
+        <script type="text/javascript" src="/mibew/js/libs/handlebars.min.js"></script>
+        <script type="text/javascript" src="/mibew/js/libs/underscore-min.js"></script>
+        <script type="text/javascript" src="/mibew/js/compiled/default/localization.js"></script>
         <script type="text/javascript" src="/mibew/js/compiled/default/handlebars_helpers.js"></script>
         <script type="text/javascript" src="test_cases/handlebars_helpers_tests.js"></script>
-        <!-- Start of Handlebars' helpers tests -->
+        <!-- End of Handlebars' helpers tests -->
     </body>
 </html>

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

@@ -196,3 +196,24 @@ test('cutString', function() {
         'Test cutting of a string that is longer than specified length'
     );
 });
+
+// Test "l10n" Handlebars helper
+test('l10n', function() {
+    // Add some localization strings that are needed helper testing
+    Mibew.Localization.set({
+        'one': 'uno',
+        'Hello {0}!': '¡Hola {0}!'
+    });
+
+    equal(
+        Handlebars.compile('{{l10n "one"}}')({}),
+        'uno',
+        'Test simple string'
+    );
+
+    equal(
+        Handlebars.compile('{{l10n "Hello {0}!" "world"}}')({}),
+        '¡Hola world!',
+        'Test string with placeholder'
+    );
+});