Add features argument to constructor.

Author: mshima

lib/index.js

@@ -111,10 +111,6 @@ class Generator extends Base {
    * @param {string[]} args           - Provide arguments at initialization
    * @param {Object} options          - Provide options at initialization
    * @param {Priority[]} [options.customPriorities] - Custom priorities
-   * @param {boolean|string} [options.unique] - Generates a uniqueBy id for the environment
-   *                                    Accepts 'namespace' or 'true' for one instance by namespace
-                                        Accepts 'argument' for one instance by namespace and 1 argument
-   *
    * @property {Object}   env         - the current Environment being run
    * @property {String}   resolved    - the path to the current generator
    * @property {String}   description - Used in `--help` output
@@ -131,10 +127,11 @@ class Generator extends Base {
    *   }
    * };
    */
-  constructor(args, options) {
+  constructor(args, options, features) {
     super();
 
     if (!Array.isArray(args)) {
+      features = options;
       options = args;
       args = [];
     }
@@ -150,6 +147,7 @@ class Generator extends Base {
     this._namespace = this.options.namespace;
     this._namespaceId = this.options.namespaceId;
     this.yoGeneratorVersion = packageJson.version;
+    this.features = features || {unique: this.options.unique};
 
     this.option('help', {
       type: Boolean,
@@ -269,19 +267,35 @@ class Generator extends Base {
     }
   }
 
+  /**
+   * Configure Generator behaviours.
+   *
+   * @param {Object} features
+   * @param {boolean|string} [features.unique] - Generates a uniqueBy id for the environment
+   *                                    Accepts 'namespace' or 'true' for one instance by namespace
+   *                                    Accepts 'argument' for one instance by namespace and 1 argument
+   *
+   */
+  setFeatures(features) {
+    Object.assign(this.features, features);
+  }
+
   /**
    * Specifications for Environment features.
    *
    * @return {Object}
    */
   getFeatures() {
-    if (this.options.unique) {
+    if (this.features.unique) {
       const {namespace} = this.options;
       let uniqueBy;
-      if (this.options.unique === true || this.options.unique === 'namespace') {
+      if (
+        this.features.unique === true ||
+        this.features.unique === 'namespace'
+      ) {
         uniqueBy = namespace;
       } else if (
-        this.options.unique === 'argument' &&
+        this.features.unique === 'argument' &&
         this._args.length === 1
       ) {
         const namespaceId = this.env
@@ -290,7 +304,7 @@ class Generator extends Base {
         uniqueBy = namespaceId.id;
       } else {
         throw new Error(
-          `Error generating a uniqueBy value. Uniqueness ${this.options.unique} is not supported`
+          `Error generating a uniqueBy value. Uniqueness '${this.features.unique}' not supported by '${this.options.namespace}'`
         );
       }