Allowed passing -ns flag to migrate to nested component structure

Author: ijlee2

README.md

@@ -16,6 +16,43 @@ cd your/project/path
 npx github:ember-codemods/ember-component-template-colocation-migrator
 ```
 
+By default, the migrator changes the **classic** component structure to the **flat** component structure.
+
+```
+your-project-name
+├── app
+│   └── components
+│       ├── foo-bar
+│       │   ├── baz.hbs
+│       │   └── baz.js
+│       ├── foo-bar.hbs
+│       └── foo-bar.js
+│   ...
+```
+
+If you want to change from **classic** to **nested**, you can add the `-ns` flag:
+
+```sh
+cd your/project/path
+npx github:ember-codemods/ember-component-template-colocation-migrator -ns
+```
+
+The nested component structure looks like:
+
+```
+your-project-name
+├── app
+│   └── components
+│       └── foo-bar
+│           ├── baz
+│           │   ├── index.hbs
+│           │   └── index.js
+│           ├── index.hbs
+│           └── index.js
+│   ...
+```
+
+
 ### Running Tests
 
- * `npm run test`
+ * `npm run test`

bin/ember-component-template-colocation-migrator

@@ -14,8 +14,19 @@ let options = {
 let parsed = nopt(options);
 let projectRoot = parsed['project-root'] || process.cwd();
 
+const args = process.argv.slice(2);
+
+// Allow passing the flag, -fs (flat) or -ns (nested), to specify component structure
 let newComponentStructure = 'flat';
 
+if (args.includes('-fs')) {
+  newComponentStructure = 'flat';
+
+} else if (args.includes('-ns')) {
+  newComponentStructure = 'nested';
+
+}
+
 let migrator = new Migrator({
   projectRoot,
   newComponentStructure
@@ -25,4 +36,4 @@ migrator.execute().then(function() {
   console.log('Codemod finished successfully!');
 }).catch(function(error) {
   console.error(error.stack);
-});
+});