Introducing engine commands

1 files changed, 37 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..33a7cd5805
--- /dev/null
+++ b/railties/lib/rails/engine/commands.rb
@@ -0,0 +1,37 @@
+require 'active_support/core_ext/object/inclusion'
+
+ARGV << '--help' if ARGV.empty?
+
+aliases = {
+  "g" => "generate"
+}
+
+command = ARGV.shift
+command = aliases[command] || command
+
+case command
+when 'generate'
+  require 'rails/generators'
+
+  require ENGINE_PATH
+  engine = ::Rails::Engine.find(ENGINE_ROOT)
+  engine.load_generators
+
+  require 'rails/commands/generate'
+
+when '--version', '-v'
+  ARGV.unshift '--version'
+  require 'rails/commands/application'
+
+else
+  puts "Error: Command not recognized" unless command.in?(['-h', '--help'])
+  puts <<-EOT
+Usage: rails COMMAND [ARGS]
+
+The common rails commands available for engines are:
+ generate    Generate new code (short-cut alias: "g")
+
+All commands can be run with -h for more information.
+  EOT
+  exit(1)
+end