Added post_get hooks to clean up unnecessary package managment files and updated README.rst

cookiecutter.json

@@ -4,5 +4,6 @@
 	"github_username": "sloria",
 	"project_name": "My Flask App",
 	"app_name": "myflaskapp",
-	"project_short_description": "A flasky app."
+	"project_short_description": "A flasky app.",
+	"use_pipenv": ["yes", "no"]
 }

hooks/post_gen_project.py

+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""Post gen hook to ensure that the generated project
+hase only one package managment, either pipenv or pip."""
+import os
+import shutil
+import sys
+
+
+def clean_extra_package_managment_files():
+    """Removes either requirements files and folderor the Pipfile."""
+    use_pipenv = '{{cookiecutter.use_pipenv}}'
+    to_delete = []
+
+    if use_pipenv == 'yes':
+        to_delete = to_delete + ['requirements.txt', 'requirements']
+    else:
+        to_delete.append('Pipfile')
+
+    try:
+        for file_or_dir in to_delete:
+            if os.path.isfile(file_or_dir):
+                os.remove(file_or_dir)
+            else:
+                shutil.rmtree(file_or_dir)
+        sys.exit(0)
+    except OSError as e:
+        sys.stdout.write(
+            'While attempting to remove file(s) an error occurred'
+        )
+        sys.stdout.write('Error: {}'.format(e))
+
+
+if __name__ == '__main__':
+    clean_extra_package_managment_files()

{{cookiecutter.app_name}}/README.rst

@@ -19,11 +19,11 @@ Run the following commands to bootstrap your environment ::
 
     git clone https://github.com/{{cookiecutter.github_username}}/{{cookiecutter.app_name}}
     cd {{cookiecutter.app_name}}
-
-    pip install -r requirements/dev.txt
-    # or use Pipenv
+    {%- if cookiecutter.use_pipenv == "yes" %}
     pipenv install --dev
-    
+    {%- else %}
+    pip install -r requirements/dev.txt
+    {%- endif %}
     npm install
     npm start  # run the webpack dev server and flask server using concurrently