#!/usr/bin/env ruby

require 'astree'
require 'optparse'

opt_parse = OptionParser.new do |opt|
  opt.banner = 'Usage: astree ruby_programfile'
  opt.parse!(ARGV)
end

if ARGV.first.nil?
  puts opt_parse
else
  puts ASTree.parse(File.read(ARGV.first))
end