Merge pull request #67 from SparshithNR/dest-dir

[Feature] : Provide destDir as an option.

README.md

@@ -40,6 +40,8 @@ let mergedNode = new MergeTrees(inputNodes, options);
 
 * `annotation`: A note to help tell multiple plugin instances apart.
 
+* `destDir`: A string representing the destination path that merged files will be copied to.
+
 ### Example
 
 If this is your `Brocfile.js`:
@@ -74,6 +76,26 @@ Then running `broccoli build the-output` will generate this folder:
 
 The parent folders, `public` and `scripts` in this case, are not included in the output. The output tree contains only the files *within* each folder, all mixed together.
 
+------
+
+If this is your `Brocfile.js`:
+
+```js
+var BroccoliMergeTrees = require('broccoli-merge-trees');
+
+module.exports = new BroccoliMergeTrees(['public', 'scripts'], {
+    destDir: 'assets'
+});
+```
+Then running `broccoli build the-output` will generate this folder:
+
+    the-output
+    └─ assets
+        ├─ app.js
+        ├─ index.html
+        └─ images
+        └─ logo.png
+
 ## Contributing
 
 Clone this repo and run the tests like so:

index.js

@@ -23,7 +23,8 @@ class BroccoliMergeTrees extends Plugin {
     if (this.mergeTrees == null) {
       // Defer instantiation until the first build because we only
       // have this.inputPaths and this.outputPath once we build.
-      this.mergeTrees = new MergeTrees(this.inputPaths, this.outputPath, {
+      let outputPath = `${this.outputPath}${this.options.destDir ? '/' + this.options.destDir : ''}`;
+      this.mergeTrees = new MergeTrees(this.inputPaths, outputPath, {
         overwrite: this.options.overwrite,
         annotation: this.options.annotation
       });

test.js

@@ -69,6 +69,26 @@ describe('MergeTrees', function() {
       'a.log': 'B',
     });
   });
+
+  it('smoke test with destDir', async function() {
+    input.write({
+      foo: '1'
+    });
+    input2.write({
+      baz: {}
+    });
+    subject = new MergeTrees([input.path(), input2.path()], {
+      destDir: 'test'
+    });
+    output = createBuilder(subject);
+    await output.build();
+    expect(output.read()).to.deep.equal({
+      test : {
+        foo: '1',
+        baz: {}
+      }
+    });
+  });
 });