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require "clamp/attribute/declaration"
require "clamp/option/definition"
module Clamp
module Option
module Declaration
include Clamp::Attribute::Declaration
def option(switches, type, description, opts = {}, &block)
Option::Definition.new(switches, type, description, opts).tap do |option|
block ||= option.default_conversion_block
define_accessors_for(option, &block)
declared_options << option
end
end
def find_option(switch)
recognised_options.find { |o| o.handles?(switch) }
end
def declared_options
@declared_options ||= []
end
def recognised_options
unless @implicit_options_declared
declare_implicit_help_option
@implicit_options_declared = true
end
effective_options
end
private
def declare_implicit_help_option
return false if effective_options.find { |o| o.handles?("--help") }
help_switches = ["--help"]
help_switches.unshift("-h") unless effective_options.find { |o| o.handles?("-h") }
option help_switches, :flag, "print help" do
request_help
end
end
def effective_options
ancestors.inject([]) do |options, ancestor|
options + options_declared_on(ancestor)
end
end
def options_declared_on(ancestor)
return [] unless ancestor.is_a?(Clamp::Option::Declaration)
ancestor.declared_options
end
end
end
end
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