#2 Ensure TeamCity messages don't get parsed twice

Gruntfile.js

@@ -68,4 +68,7 @@ module.exports = function(grunt) {
   grunt.registerTask('isolated_test', function(){
     grunt.log.warn('foo-bar-uniqe-string');
   });
+  grunt.registerTask('isolated_test_parse_twice', function(){
+    grunt.log.warn("##teamcity['someMessage']");
+  });
 };

tasks/teamcity.js

@@ -73,9 +73,13 @@ module.exports = function(grunt) {
     }
 
     function tcFormat(text, status, errorDetails) {
-        return  ("##teamcity[message text='" + text +
-            "' errorDetails='" + (errorDetails || '') +
-            "' status='" + status + "']\n").grey;
+      if (text.indexOf('##teamcity[') !== -1) {
+        return text;
+      }
+
+      return  ("##teamcity[message text='" + text +
+        "' errorDetails='" + (errorDetails || '') +
+        "' status='" + status + "']\n").grey;
     }
 
     // verbatum from grunt.log

test/teamcity_test.js

@@ -69,5 +69,19 @@ exports.teamcity = {
       test.equal(tcMsgCount, 1, 'Message is output in Teamcity format with custom status');
       test.done();
     });
+  },
+  message_not_parsed_twice: function(test){
+    test.expect(1);
+    exec('grunt teamcity:default_options isolated_test_parse_twice --no-color', function(err, stdout){
+      var tcMsgCount = 0;
+      stdout.split('\n').forEach(function(line){
+        if (line.contains("##teamcity[message text='##teamcity['someMessage']' errorDetails='' status='ERROR'")) {
+          tcMsgCount++;
+        }
+      });
+
+      test.equal(tcMsgCount, 0, 'Teamcity messages are not parsed twice');
+      test.done();
+    });
   }
 };