手続き的な関数やサブルーチンを手続き的に書けるようにするDSL

gistfile1.rb

def method_missing(symbol, *argument)
  if argument.size == 1 && Proc === argument.first
    [symbol, argument.first]
  else
    super
  end
end
def const_missing(symbol, *argument)
  if argument.size == 1 && Proc === argument.first
    [symbol, argument.first]
  else
    super
  end
end

def sub(pair)
  symbol, lambda = pair
  Object.class_eval { const_set(symbol, lambda) }
end
def func(arg)
  case arg
  when Proc
    arg
  when Array
    symbol, lambda = arg
    define_method(symbol, lambda)
  end
end
def call(subroutine, *arguments)
  subroutine.call *arguments
end

sub Subroutine -> argument {
  p argument
}
call Subroutine, 'Hello'

func function -> argument {
  p argument
}
function 'World'
anonym = func -> argument {
  p argument
}
call anonym, 'Hello, World.'