Add a startplugin management command

To use::

    >>> python manage.py startplugin {{ valid_app_name }}

This command generates the following app structure:

    -   plugin_name/__init__.py
    -   plugin_name/admin.py
    -   plugin_name/models.py
    -   plugin_name/static/widgy/js/components/widgy.example/component.js
    -   plugin_name/templates/widgy/widgy.example/example.html
    -   plugin_name/tests.py

Author: Chris Proto

widgy/conf/plugin_template/__init__.py

@@ -0,0 +1,4 @@
+from {{ plugin_name }}.models import *
+from widgy.admin import WidgyAdmin
+
+## Register Here ##

widgy/conf/plugin_template/admin.py

@@ -0,0 +1,5 @@
+"""
+Models for Widgy plugin: {{ plugin_name }}
+"""
+from django.db import models
+from widgy.models import Content

widgy/conf/plugin_template/models.py

@@ -0,0 +1,15 @@
+define([ 'widgy.contents', 'widgets/widgets'
+    ], function(
+    contents,
+    widgets) {
+
+  var ContentView = widgets.WidgetView.extend({
+    editorClass: widgets.EditorView
+  });
+
+  var ExampleContent = contents.Content.extend({
+    viewClass: ContentView
+  });
+
+  return ExampleContent;
+});

widgy/conf/plugin_template/static/widgy/js/components/widgy.example/component.js

@@ -0,0 +1,3 @@
+<div class="example">
+  {{ content.content }}
+</div>

widgy/conf/plugin_template/templates/widgy/widgy.example/example.html

@@ -0,0 +1,23 @@
+from django.utils.importlib import import_module
+from django.core.management.templates import TemplateCommand
+from django.core.management.base import CommandError
+
+
+class Command(TemplateCommand):
+    help = 'Create a new widgy plugin.'
+
+    def handle(self, app_name=None, target=None, **options):
+        if app_name is None:
+            raise CommandError("you must provide an app name")
+
+        # Check that the app_name cannot be imported.
+        try:
+            import_module(app_name)
+        except ImportError:
+            pass
+        else:
+            raise CommandError("%r conflicts with the name of an existing "
+                               "Python module and cannot be used as an app "
+                               "name. Please try another name." % app_name)
+
+        super(Command, self).handle('plugin', app_name, target, **options)