initial presets functionality

Fixes #118

Author: Alexej Yaroshevich

lib/HtmlDiff.js

@@ -5,7 +5,8 @@ var diff = require('diff'),
  * @class HtmlDiff
  * @constructor
  * @augments Diff
- * @param {Object}   [options]
+ * @param {Object|String} [options] options or preset name
+ * @param {String}   [options.preset]
  * @param {String[]} [options.ignoreAttributes]
  * @param {String[]} [options.compareAttributesAsJSON]
  * @param {Boolean}  [options.ignoreWhitespaces=true]

lib/utils/defaults.js

@@ -1,32 +1,34 @@
 var _ = require('lodash');
 
+var presets = {
+    bem: require('../../presets/bem.json')
+};
+
 /**
  * Sets options
- * @param {Object}   [options]
+ * @param {Object|String} [options] options or preset name
+ * @param {String}   [options.preset]
  * @param {String[]} [options.ignoreAttributes]
  * @param {String[]} [options.compareAttributesAsJSON]
  * @param {Boolean}  [options.ignoreWhitespaces=true]
  * @param {Boolean}  [options.ignoreComments=true]
- * @param {Boolean}  [options.ignoreClosingTags=false]
+ * @param {Boolean}  [options.ignoreEndTags=false]
  * @param {Boolean}  [options.ignoreDuplicateAttributes=false]
  * returns {Object}
  */
  module.exports = function (options) {
     if (typeof options === 'string') {
-        if (options === 'bem') {
-            options = {
-                // ignore generated attributes
-                ignoreAttributes: ['id', 'for', 'aria-labelledby', 'aria-describedby'],
-                compareAttributesAsJSON: [
-                    'data-bem',
-                    { name: 'onclick', isFunction: true },
-                    { name: 'ondblclick', isFunction: true }
-                ]
-            };
-        } else {
-            console.error(options.bold.red + ' is an invalid preset name. Use ' + 'bem'.bold.green + ' instead.');
-            process.exit(1);
+        options = { preset: options };
+    }
+
+    if (options && options.preset) {
+        var preset = String(options.preset);
+        if (!presets.hasOwnProperty(preset)) {
+            throw Error(preset + ' is an invalid preset name.');
         }
+
+        delete options.preset;
+        options = _.defaults(options, presets[preset]);
     }
 
     return _.defaults(options || {}, {

presets/bem.json

@@ -0,0 +1,8 @@
+{
+    "ignoreAttributes": ["id", "for", "aria-labelledby", "aria-describedby"],
+    "compareAttributesAsJSON": [
+        "data-bem",
+        { "name": "onclick", "isFunction": true },
+        { "name": "ondblclick", "isFunction": true }
+    ]
+}