feat(minErr): Error stripping build step

Author: ksheedlo

Gruntfile.js

@@ -191,6 +191,6 @@ module.exports = function(grunt) {
   grunt.registerTask('minify', ['shell:bower','clean', 'build', 'minall']);
   grunt.registerTask('test:e2e', ['connect:testserver', 'test:end2end']);
   grunt.registerTask('webserver', ['connect:devserver']);
-  grunt.registerTask('package', ['shell:bower','clean', 'buildall', 'minall', 'docs', 'copy', 'write', 'compress']);
+  grunt.registerTask('package', ['shell:bower','clean', 'buildall', 'minall', 'collect-errors', 'docs', 'copy', 'write', 'compress']);
   grunt.registerTask('default', ['package']);
 };

bower.json

@@ -6,6 +6,7 @@
     "google-code-prettify": "1.0.0",
     "components-font-awesome": "3.1.0",
     "bootstrap": "https://raw.github.com/twitter/bootstrap/v2.0.2/docs/assets/bootstrap.zip",
-    "closure-compiler": "https://closure-compiler.googlecode.com/files/compiler-20130603.zip"
+    "closure-compiler": "https://closure-compiler.googlecode.com/files/compiler-20130603.zip",
+    "ng-closure-runner": "https://raw.github.com/angular/ng-closure-runner/v0.1/assets/ng-closure-runner.zip"
   }
 }

lib/grunt/plugins.js

@@ -59,4 +59,8 @@ module.exports = function(grunt) {
   grunt.registerMultiTask('autotest', 'Run and watch the unit tests with Karma', function(){
     util.startKarma.call(util, this.data, false, this.async());
   });
+
+  grunt.registerTask('collect-errors', 'Combine stripped error files', function () {
+    util.collectErrors();
+  });
 };

lib/grunt/utils.js

@@ -134,12 +134,18 @@ module.exports = {
     var minFile = file.replace(/\.js$/, '.min.js');
     var mapFile = minFile + '.map';
     var mapFileName = mapFile.match(/[^\/]+$/)[0];
+    var errorFileName = file.replace(/\.js$/, '-errors.json');
     shell.exec(
         'java ' +
             this.java32flags() + ' ' +
-            '-jar components/closure-compiler/compiler.jar ' +
+            '-cp ./components/closure-compiler/compiler.jar' +
+            ':./components/ng-closure-runner/ngcompiler.jar ' +
+            'org.angularjs.closurerunner.NgClosureRunner ' +
             '--compilation_level SIMPLE_OPTIMIZATIONS ' +
             '--language_in ECMASCRIPT5_STRICT ' +
+            '--minerr_pass ' +
+            '--minerr_errors ' + errorFileName + ' ' +
+            '--minerr_url \'http://docs.angularjs.org/minerr/\' ' +
             '--source_map_format=V3 ' +
             '--create_source_map ' + mapFile + ' ' +
             '--js ' + file + ' ' +
@@ -167,6 +173,44 @@ module.exports = {
   },
 
 
+  //collects and combines error messages stripped out in minify step
+  collectErrors: function () {
+    var combined = {
+      id: 'ng',
+      generated: new Date().toString(),
+      errors: {}
+    };
+    grunt.file.expand('build/*-errors.json').forEach(function (file) {
+      var errors = grunt.file.readJSON(file),
+        namespace;
+      Object.keys(errors).forEach(function (prop) {
+        if (typeof errors[prop] === 'object') {
+          namespace = errors[prop];
+          if (combined.errors[prop]) {
+            Object.keys(namespace).forEach(function (code) {
+              if (combined.errors[prop][code] && combined.errors[prop][code] !== namespace[code]) {
+                grunt.warn('[collect-errors] Duplicate minErr codes don\'t match!');
+              } else {
+                combined.errors[prop][code] = namespace[code];
+              }
+            });
+          } else {
+            combined.errors[prop] = namespace;
+          }
+        } else {
+          if (combined.errors[prop] && combined.errors[prop] !== errors[prop]) {
+            grunt.warn('[collect-errors] Duplicate minErr codes don\'t match!');
+          } else {
+            combined.errors[prop] = errors[prop];
+          }
+        }
+      });
+    });
+    grunt.file.write('build/errors.json', JSON.stringify(combined));
+    grunt.file.expand('build/*-errors.json').forEach(grunt.file.delete);
+  },
+
+
   //csp connect middleware
   csp: function(){
     return function(req, res, next){