DEV: rails generator to create plugin skeleton (#6332)

rails g plugin --help
rails g plugin DiscourseRacoon --author joffrey

lib/generators/plugin/plugin_generator.rb

@@ -0,0 +1,63 @@
+require 'rails/generators/named_base'
+
+class PluginGenerator < Rails::Generators::NamedBase
+  desc 'This generator creates a Discourse plugin skeleton'
+
+  source_root File.expand_path('templates', __dir__)
+
+  class_option :author, type: :string, desc: "Plugin author", required: true
+  class_option :stylesheet, type: :boolean, desc: "Generate Stylesheet", default: true
+  class_option :javascript, type: :boolean, desc: "Generate Javascript initializer", default: true
+  class_option :scheduled_job, type: :boolean, desc: "Generate Stylesheet", default: false
+
+  def create_scheduled_job_file
+    return unless @options['scheduled_job']
+
+    path = File.join('plugins', dasherized_name, 'jobs/scheduled', "check_#{underscored_name}.rb")
+    template 'scheduled_job.rb.erb', path
+  end
+
+  def create_readme_file
+    template 'README.md.erb', File.join('plugins', dasherized_name, "README.md")
+  end
+
+  def create_license_file
+    template 'LICENSE.erb', File.join('plugins', dasherized_name, "LICENSE")
+  end
+
+  def create_plugin_file
+    template 'plugin.rb.erb', File.join('plugins', dasherized_name, "plugin.rb")
+  end
+
+  def create_stylesheet_file
+    return unless @options['stylesheet']
+
+    template 'stylesheet.scss.erb', File.join('plugins', dasherized_name, 'assets/stylesheets/common', "#{dasherized_name}.scss")
+  end
+
+  def create_javascript_file
+    return unless @options['javascript']
+
+    template 'javascript.es6.erb', File.join('plugins', dasherized_name, 'assets/javascripts/initializers', "#{dasherized_name}.es6")
+  end
+
+  def create_gitignore_entry
+    plugin_entry = "!/plugins/#{dasherized_name}"
+
+    unless File.readlines(".gitignore").grep(/#{plugin_entry}/).size > 0
+      open('.gitignore', 'a') { |f| f.puts "\n#{plugin_entry}" }
+    end
+  end
+
+  def underscored_name
+    name.underscore
+  end
+
+  def dasherized_name
+    underscored_name.dasherize
+  end
+
+  def classified_name
+    name.tableize.classify
+  end
+end