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require "clamp/attribute/definition"
require "clamp/truthy"
module Clamp
module Option
class Definition < Attribute::Definition
def initialize(switches, type, description, options = {})
@switches = Array(switches)
@type = type
@description = description
super(options)
@multivalued = options[:multivalued]
return unless options.key?(:required)
@required = options[:required]
# Do some light validation for conflicting settings.
raise ArgumentError, "Specifying a :default value with :required doesn't make sense" if options.key?(:default)
raise ArgumentError, "A required flag (boolean) doesn't make sense." if type == :flag
end
attr_reader :switches, :type
def long_switch
switches.find { |switch| switch =~ /^--/ }
end
def handles?(switch)
recognised_switches.member?(switch)
end
def flag?
@type == :flag
end
def flag_value(switch)
!(switch =~ /^--no-(.*)/ && switches.member?("--\[no-\]#{Regexp.last_match(1)}"))
end
def read_method
if flag?
super + "?"
else
super
end
end
def extract_value(switch, arguments)
if flag?
flag_value(switch)
else
arguments.shift
end
end
def default_conversion_block
Clamp.method(:truthy?) if flag?
end
def help_lhs
lhs = switches.join(", ")
lhs += " " + type unless flag?
lhs
end
private
def recognised_switches
switches.map do |switch|
if switch =~ /^--\[no-\](.*)/
["--#{Regexp.last_match(1)}", "--no-#{Regexp.last_match(1)}"]
else
switch
end
end.flatten
end
def infer_attribute_name
unless long_switch
raise Clamp::DeclarationError, "You must specify either a long-switch or an :attribute_value"
end
inferred_name = long_switch.sub(/^--(\[no-\])?/, "").tr("-", "_")
inferred_name += "_list" if multivalued?
inferred_name
end
end
end
end
|
