module Clamp module Subcommand module Execution # override default Command behaviour def execute # delegate to subcommand subcommand = instatiate_subcommand(subcommand_name) subcommand.run(subcommand_arguments) end private def instatiate_subcommand(name) subcommand_class = find_subcommand_class(name) parent_attribute_values = {} inheritable_attributes.each do |option| if instance_variable_defined?(option.ivar_name) parent_attribute_values[option] = instance_variable_get(option.ivar_name) end end subcommand_class.new("#{invocation_path} #{name}", context, parent_attribute_values) end def inheritable_attributes self.class.recognised_options + self.class.parameters_before_subcommand end def find_subcommand_class(name) subcommand_def = self.class.find_subcommand(name) || signal_usage_error("No such sub-command '#{name}'") subcommand_def.subcommand_class end end end end