module Rails::Command

def invoke(full_namespace, args = [], **config)
  namespace = full_namespace = full_namespace.to_s
  if char = namespace =~ /:(\w+)$/
    command_name, namespace = $1, namespace.slice(0, char)
  else
    command_name = namespace
  end
  command_name, namespace = "help", "help" if command_name.blank? || HELP_MAPPINGS.include?(command_name)
  command_name, namespace, args = "application", "application", ["--help"] if rails_new_with_no_path?(args)
  command_name, namespace = "version", "version" if %w( -v --version ).include?(command_name)
  original_argv = ARGV.dup
  ARGV.replace(args)
  command = find_by_namespace(namespace, command_name)
  if command && command.all_commands[command_name]
    command.perform(command_name, args, config)
  else
    args = ["--describe", full_namespace] if HELP_MAPPINGS.include?(args[0])
    find_by_namespace("rake").perform(full_namespace, args, config)
  end
ensure
  ARGV.replace(original_argv)
end