Module: Paint

Defined in:
lib/paint/shortcuts.rb,
lib/paint/shortcuts_version.rb

Constant Summary collapse

SHORTCUTS =

Hash for defining color/effect shortcuts

{
  # :example => {                    # would create a Paint::Example constant...
  #   :light_red     => "\e[31;1m",  # with a method .light_red
  # }
}
SHORTCUTS_VERSION = 
'1.0.0'

Class Method Summary collapse

Class Method Details

.const_missing(mod_name) ⇒ Object

Paint::SomeModule –> Paint::SHORTCUTS



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# File 'lib/paint/shortcuts.rb', line 16

def const_missing(mod_name)
  # get shortcuts
  shortcuts = SHORTCUTS[mod_name.to_s.gsub(/[A-Z]/,'_\0').downcase[1..-1].to_sym] || []

  # create module
  class_eval "module #{mod_name}; end"
  mod = const_get(mod_name)

  # define direct behaviour, class methods
  mod.define_singleton_method :method_missing do |color_name, *args|
    if color_code = shortcuts[color_name]
      string = Array(args).join
      return string if Paint.mode.zero?

      if args.empty?
        color_code
      else
        color_code + string + NOTHING
      end
    else
      nil
    end
  end

  mod.define_singleton_method :respond_to_missing? do |color_name, *args|
    shortcuts.include?(color_name) || super(color_name, *args)
  end

  # define include behaviour, instance methods
  mod.define_singleton_method :included do |_|
    shortcuts.each{ |color_name, color_code|
      define_method color_name do |*args|
        string = Array(args).join
        return string if Paint.mode.zero?

        if args.empty?
          color_code
        else
          color_code + string + NOTHING
        end
      end
    }
    private(*shortcuts.keys) unless shortcuts.empty?
  end

  # include variations, defined in child modules
  mod.class_eval "module String; end"
  string = mod.const_get(:String)
  string.define_singleton_method :included do |_|
    shortcuts.each{ |color_name, color_code|
      define_method color_name do
        if Paint.mode.zero?
          to_s
        else
          color_code + to_s + NOTHING
        end
      end
    }
  end

  # OK, let's take it one level further ;)
  mod.class_eval "module Prefix; end"
  prefix_prefix = mod.const_get(:Prefix)
  prefix_prefix.define_singleton_method :const_missing do |prefix_name|
    class_eval "module #{prefix_name}; end"
    prefix = const_get(prefix_name)

    prefix.define_singleton_method :included do |_|
      define_method prefix_name.to_s.gsub(/[A-Z]/,'_\0').downcase[1..-1].to_sym do |color_name|
        if color_code = shortcuts[color_name]
          return to_s if Paint.mode.zero?
          color_code + to_s + NOTHING
        end
      end
    end

    prefix
  end

  mod
end