MAGETWO-55345: Grunt uses actual theme's list

Gruntfile.js.sample

@@ -5,12 +5,13 @@
 
 // For performance use one level down: 'name/{,*/}*.js'
 // If you want to recursively match all subfolders, use: 'name/**/*.js'
+
 module.exports = function (grunt) {
     'use strict';
 
     var _ = require('underscore'),
         path = require('path'),
-        themes = require('./dev/tools/grunt/configs/themes'),
+        themes = require('./dev/tools/grunt/tools/files-router').getThemes(),
         configDir = './dev/tools/grunt/configs',
         tasks = grunt.file.expand('./dev/tools/grunt/tasks/*');
 

dev/tools/grunt/configs/clean.js

@@ -5,7 +5,7 @@
 
 'use strict';
 
-var themes = require('./themes'),
+var themes = require('../tools/files-router').getThemes(),
     _      = require('underscore');
 
 var themeOptions = {};

dev/tools/grunt/configs/combo.js

@@ -5,7 +5,7 @@
 
 'use strict';
 
-var theme = require('./themes'),
+var theme = require('../tools/files-router').getThemes(),
     path = require('./path');
 
 /**

dev/tools/grunt/configs/exec.js

@@ -6,7 +6,7 @@
 'use strict';
 
 var combo = require('./combo'),
-    themes = require('./themes'),
+    themes = require('../tools/files-router').getThemes(),
     _      = require('underscore');
 
 var themeOptions = {};

dev/tools/grunt/configs/less.js

@@ -6,7 +6,7 @@
 'use strict';
 
 var combo  = require('./combo'),
-    themes = require('./themes'),
+    themes = require('../tools/files-router').getThemes(),
     _      = require('underscore');
 
 var themeOptions = {};

dev/tools/grunt/configs/watch.js

@@ -6,7 +6,7 @@
 'use strict';
 
 var combo  = require('./combo'),
-    themes = require('./themes'),
+    themes = require('../tools/files-router').getThemes(),
     _      = require('underscore');
 
 var themeOptions = {};

dev/tools/grunt/tools/files-router.js

@@ -0,0 +1,60 @@
+/**
+ * Copyright © 2016 Magento. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+'use strict';
+
+module.exports = {
+    defaultConfig: {
+        'themes': 'dev/tools/grunt/configs/themes'
+    },
+
+    /**
+     * Immediately invoked function.
+     * Loads user config file.
+     */
+    userConfig: (function () {
+        try {
+            return require(process.cwd() + '/grunt-config');
+        } catch (error) {
+            return null;
+        }
+    })(),
+
+    /**
+     * Loads "themes" file.
+     * Load priority:
+     *      From user config;
+     *      From default config with ".loc" suffix ;
+     *      From default config;
+     *
+     * @returns themes file or error
+     */
+    getThemes: function () {
+        if (this.userConfig && this.userConfig.themes) {
+            return require(this.getFullPath(this.userConfig.themes));
+        } else {
+            try {
+                return require(this.getFullPath(this.defaultConfig.themes + '.loc'));
+            } catch (error) {
+                try {
+                    return require(this.getFullPath(this.defaultConfig.themes));
+                } catch (error) {
+                    throw  error;
+                }
+            }
+        }
+    },
+
+    /**
+     * Generates full path to file.
+     *
+     * @param {String} path - relative path to file.
+     *
+     * @returns {String} Full path to file
+     */
+    getFullPath: function (path) {
+        return process.cwd() + '/' + path;
+    }
+};

grunt-config.json.sample

@@ -0,0 +1,3 @@
+{
+    "themes": "dev/tools/grunt/configs/local-themes"
+}