Add build:foo feature flag support.

@@ -37,9 +37,6 @@ module.exports = function (grunt) {
             lines.push('container[' + JSON.stringify(id) + ']=' + JSON.stringify(file) + ';\n');
         });
         lines.push('})(require.paths);');
-        if (false && lines.length == 2) {
-            lines = [];
-        }
         grunt.file.write('.grunt/holygrail/scripts/revconfig.js', lines.join(''));
     });
 
@@ -49,7 +46,7 @@ module.exports = function (grunt) {
         var holyGrailTmp = '.grunt/holygrail';
         var initConfig = {
             clean: {
-                dist: {
+                montyPython: {
                     files: [{
                         dot: true,
                         src: [
@@ -88,8 +85,14 @@ module.exports = function (grunt) {
         var checkList = [];
         var buildList = [
             'check',
-            'clean:dist',
+            'clean:montyPython',
+            'post-clean',
         ];
+        var postCleanList = [];
+
+        grunt.registerTask('post-clean', 'post-clean', function() {
+            grunt.task.run(postCleanList);
+        });
 
         function externalMultiTask(name, desc, command, updateOptions) {
             grunt.log.writeln('registering multiTask', name);
@@ -236,7 +239,7 @@ module.exports = function (grunt) {
                     src: ['dist/!(scripts){,**/}*.html'],
                 },
             };
-            initConfig.clean.dist.files[0].src.push('.grunt/usemin');
+            initConfig.clean.montyPython.files[0].src.push('.grunt/usemin');
             initConfig.htmlmin = {
                 dist: {
                     //options: _.extend({}, mpConfig.htmlmin.options),
@@ -262,7 +265,7 @@ module.exports = function (grunt) {
                     }),
                 }]
             };
-            initConfig.clean.dist.files[0].src.push('.grunt/usemin-css');
+            initConfig.clean.montyPython.files[0].src.push('.grunt/usemin-css');
             initConfig.usemin.css =  _.map(mpConfig.css.options.dirs, function (value) {
                 return 'dist/' + value + '/{,**/}*.css';
             });
@@ -367,7 +370,6 @@ module.exports = function (grunt) {
             initConfig.requirejs = {
                 dist: {
                     options: {
-
                         done: function onDone(next) {
                             /* jshint devel:true */
                             var target = grunt.task.current.target;
@@ -390,7 +392,7 @@ module.exports = function (grunt) {
                             }
                             //lines.push('return bundles;');
                             lines.push('})(require, \'bundles\');');
-                            if (lines.length == 2) {
+                            if (lines.length == 3) {
                                 lines = [];
                             }
                             grunt.file.write('.grunt/holygrail/scripts/bundles.js', lines.join('\n'));
@@ -459,9 +461,6 @@ module.exports = function (grunt) {
         }
         //buildList.push('uglify:bower');             // montyPython
         //buildList.push('uglify:requireconfig');     // montyPython
-        if (mpConfig.useRev && mpConfig.bower) {
-            //buildList.push('rev:requireconfig');        // montyPython
-        }
         buildList.push('usemin:html');              // montyPython
         buildList.push('usemin:css');               // montyPython
         buildList.push('htmlmin');                  // montyPython
@@ -474,7 +473,32 @@ module.exports = function (grunt) {
             'check',
         ]);
 
-        grunt.registerTask('build', buildList);
+        grunt.registerTask('build', 'build the system', function() {
+            var featureFlags = {};
+            if (arguments.length) {
+                for (var i in arguments) {
+                    featureFlags['BUILD_' + arguments[i].toUpperCase()] = true;
+                }
+                grunt.registerTask('writeFeatureFlags', 'write feature flags', function() {
+                    var lines = [
+                        '(function(container, propName) {',
+                        'container = (container[propName] = container[propName] || {});',
+                    ];
+                    for (var flag in featureFlags) {
+                        lines.push('require.config.featureFlags[' + JSON.stringify(flag) + ']=' + JSON.stringify(featureFlags[flag]) + ';');
+                    }
+                    //lines.push('return bundles;');
+                    lines.push('})(require.config, \'featureFlags\');');
+                    if (lines.length == 3) {
+                        lines = [];
+                    }
+                    grunt.file.write('.grunt/holygrail/scripts/featureFlags.js', lines.join('\n'));
+                });
+                postCleanList.add('writeFeatureFlags');
+            }
+
+            grunt.task.run(buildList);
+        });
     }
 
     return {