1 files changed, 41 insertions, 0 deletions
diff --git a/railties/lib/rails/engine/commands.rb b/railties/lib/rails/engine/commands.rb
new file mode 100644
index 0000000000..f39f926109
--- /dev/null
+++ b/railties/lib/rails/engine/commands.rb
@@ -0,0 +1,41 @@
+ARGV << '--help' if ARGV.empty?
+
+aliases = {
+  "g" => "generate",
+  "d" => "destroy"
+}
+
+command = ARGV.shift
+command = aliases[command] || command
+
+require ENGINE_PATH
+engine = ::Rails::Engine.find(ENGINE_ROOT)
+
+case command
+when 'generate', 'destroy'
+  require 'rails/generators'
+  Rails::Generators.namespace = engine.railtie_namespace
+  engine.load_generators
+  require "rails/commands/#{command}"
+
+when '--version', '-v'
+  ARGV.unshift '--version'
+  require 'rails/commands/application'
+
+else
+  puts "Error: Command not recognized" unless %w(-h --help).include?(command)
+  puts <<-EOT
+Usage: rails COMMAND [ARGS]
+
+The common Rails commands available for engines are:
+ generate    Generate new code (short-cut alias: "g")
+ destroy     Undo code generated with "generate" (short-cut alias: "d")
+
+All commands can be run with -h for more information.
+
+If you want to run any commands that need to be run in context
+of the application, like `rails server` or `rails console`,
+you should do it from application's directory (typically test/dummy).
+  EOT
+  exit(1)
+end