Add --coffee option to component generator

README.md

@@ -268,6 +268,14 @@ For example:
 rails generate react:component Label label:string --es6
 ```
 
+**--coffee** : Generate the component using CoffeeScript syntax
+
+For example:
+
+```shell
+rails generate react:component Label label:string --coffee
+```
+
 #### Arguments
 
 The generator can use the following arguments to create basic propTypes:

lib/generators/react/component_generator.rb

@@ -51,9 +51,14 @@ class ComponentGenerator < ::Rails::Generators::NamedBase
                :banner => "field[:type] field[:type] ..."
 
       class_option :es6,
-       type: :boolean,
-       default: false,
-       desc: 'Output es6 class based component'
+                   type: :boolean,
+                   default: false,
+                   desc: 'Output es6 class based component'
+
+      class_option :coffee,
+                   type: :boolean,
+                   default: false,
+                   desc: 'Output coffeescript based component'
 
       REACT_PROP_TYPES = {
         "node" =>        'React.PropTypes.node',
@@ -85,7 +90,15 @@ class ComponentGenerator < ::Rails::Generators::NamedBase
       }
 
       def create_component_file
-        extension = options[:es6] ? "es6.jsx" : "js.jsx"
+        extension = case
+                      when options[:es6]
+                        'es6.jsx'
+                      when options[:coffee]
+                        'js.jsx.coffee'
+                      else
+                        'js.jsx'
+                    end
+
         file_path = File.join('app/assets/javascripts/components', "#{file_name}.#{extension}")
         template("component.#{extension}", file_path)
       end

lib/generators/templates/component.js.jsx.coffee

@@ -0,0 +1,18 @@
+class @<%= file_name.camelize %> extends React.Component
+<% if attributes.size > 0 -%>
+  @propTypes =
+<% attributes.each do |attribute| -%>
+    <%= attribute[:name].camelize(:lower) %>: <%= attribute[:type] %>
+<% end -%>
+
+<% end -%>
+  render: ->
+<% if attributes.size > 0 -%>
+    `<div>
+<% attributes.each do |attribute| -%>
+      <div><%= attribute[:name].titleize %>: {this.props.<%= attribute[:name].camelize(:lower) %>}</div>
+<% end -%>
+    </div>`
+<% else -%>
+    `<div />`
+<% end -%>

test/generators/coffee_component_generator_test.rb

@@ -0,0 +1,40 @@
+require 'test_helper'
+require 'generators/react/component_generator'
+
+class CoffeeComponentGeneratorTest < Rails::Generators::TestCase
+  destination File.join(Rails.root, 'tmp', 'component_generator_test_output')
+  setup :prepare_destination
+  tests React::Generators::ComponentGenerator
+
+  def filename
+    'app/assets/javascripts/components/generated_component.js.jsx.coffee'
+  end
+
+  def class_name
+    'GeneratedComponent'
+  end
+
+  test 'that it the uses CoffeeScript syntax' do
+    run_generator %w(GeneratedComponent name --coffee)
+
+    assert_file filename, /^class @#{class_name}\sextends\sReact\.Component/
+  end
+
+  test 'that propTypes get assigned' do
+    run_generator %w(GeneratedComponent name --coffee)
+
+    assert_file filename, /@propTypes\s=/
+    assert_file filename, /React.PropTypes/
+  end
+
+  test 'that it generates working jsx' do
+    expected_name_div = /React\.createElement\(\s*"div",\s*null,\s*"Name:\s*",\s*this\.props\.name\s*\)/x
+    expected_shape_div = /React\.createElement\(\s*"div",\s*null,\s*"Address:\s*",\s*this\.props\.address\s*\)/x
+
+    run_generator %w(GeneratedComponent name:string address:shape --coffee)
+    jsx = React::JSX.transform(CoffeeScript.compile(File.read(File.join(destination_root, filename))))
+
+    assert_match(Regexp.new(expected_name_div), jsx)
+    assert_match(Regexp.new(expected_shape_div), jsx)
+  end
+end