Class: Clap

Inherits:
Object
  • Object
show all
Defined in:
lib/clap.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(argv, opts) ⇒ Clap

Returns a new instance of Clap.



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# File 'lib/clap.rb', line 9

def initialize(argv, opts)
  @argv = argv.dup
  @opts = opts
end

Instance Attribute Details

#argv ⇒ Object (readonly)

Returns the value of attribute argv.



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# File 'lib/clap.rb', line 2

def argv
  @argv
end

#opts ⇒ Object (readonly)

Returns the value of attribute opts.



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# File 'lib/clap.rb', line 3

def opts
  @opts
end

Class Method Details

.run(args, opts) ⇒ Object 



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# File 'lib/clap.rb', line 5

def self.run(args, opts)
  new(args, opts).run
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/clap.rb', line 14

def run
  args = []

  while argv.any?

    item = argv.shift
    flag = opts[item]

    if flag

      # Work around lambda semantics in 1.8.7.
      arity = [flag.arity, 0].max

      # Raise if there are not enough parameters
      # available for the flag.
      if argv.size < arity
        raise ArgumentError
      end

      # Call the lambda with N items from argv,
      # where N is the lambda's arity.
      flag.call(*argv.shift(arity))
    else

      # Collect the items that don't correspond to
      # flags.
      args << item
    end
  end

  args
end