Add "cutString" Handlebars.js helper

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

@@ -233,4 +233,17 @@
 
         return result;
     });
+
+    /**
+     * Registers "cutString" helper.
+     *
+     * This helper cuts a string if it exceeds specified length. Example of
+     * usage:
+     * <code>
+     *   {{cutString string length}}
+     * </code>
+     */
+    Handlebars.registerHelper('cutString', function(length, options) {
+        return options.fn(this).substr(0, length);
+    });
 })(Mibew, Handlebars);

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

@@ -167,3 +167,21 @@ test('repeat', function() {
         'Test repeating'
     );
 });
+
+// Test "cutString" Handlebars helper
+test('cutString', function() {
+    var template = '{{#cutString length}}{{str}}{{/cutString}}';
+    var compiledTemplate = Handlebars.compile(template);
+
+    equal(
+        compiledTemplate({str: 'Hello world!', length: 40}),
+        'Hello world!',
+        'Test cutting of a string that is shorter than specified length'
+    );
+
+    equal(
+        compiledTemplate({str: 'Hello world!', length: 5}),
+        'Hello',
+        'Test cutting of a string that is longer than specified length'
+    );
+});