88 lines
2.5 KiB
Ruby
88 lines
2.5 KiB
Ruby
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module Mercenary
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class Option
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attr_reader :config_key, :description, :short, :long, :return_type
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# Public: Create a new Option
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#
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# config_key - the key in the config hash to which the value of this option
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# will map
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# info - an array containing first the switches, then an optional
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# return type (e.g. Array), then a description of the option
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#
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# Returns nothing
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def initialize(config_key, info)
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@config_key = config_key
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while arg = info.shift
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begin
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@return_type = Object.const_get("#{arg}")
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next
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rescue NameError
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end
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if arg.start_with?("-")
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if arg.start_with?("--")
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@long = arg
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else
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@short = arg
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end
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next
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end
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@description = arg
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end
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end
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# Public: Fetch the array containing the info OptionParser is interested in
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#
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# Returns the array which OptionParser#on wants
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def for_option_parser
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[short, long, return_type, description].flatten.reject{ |o| o.to_s.empty? }
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end
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# Public: Build a string representation of this option including the
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# switches and description
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#
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# Returns a string representation of this option
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def to_s
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"#{formatted_switches} #{description}"
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end
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# Public: Build a beautifully-formatted string representation of the switches
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#
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# Returns a formatted string representation of the switches
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def formatted_switches
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[
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switches.first.rjust(10),
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switches.last.ljust(13)
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].join(", ").gsub(/ , /, ' ').gsub(/, /, ' ')
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end
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# Public: Hash based on the hash value of instance variables
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#
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# Returns a Fixnum which is unique to this Option based on the instance variables
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def hash
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instance_variables.map do |var|
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instance_variable_get(var).hash
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end.reduce(:^)
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end
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# Public: Check equivalence of two Options based on equivalence of their
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# instance variables
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#
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# Returns true if all the instance variables are equal, false otherwise
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def eql?(other)
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return false unless self.class.eql?(other.class)
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instance_variables.map do |var|
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instance_variable_get(var).eql?(other.instance_variable_get(var))
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end.all?
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end
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# Public: Fetch an array of switches, including the short and long versions
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#
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# Returns an array of two strings. An empty string represents no switch in
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# that position.
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def switches
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[short, long].map(&:to_s)
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end
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end
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end
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