#!/usr/bin/env ruby

Signal.trap("INT") { exit 1 }

require 'bundler/ruby_version'
require 'bundler/ruby_dsl'
require 'bundler/shared_helpers'

module Bundler
  class GemfileError < RuntimeError; end
  class Dsl
    include RubyDsl

    attr_accessor :ruby_version

    def initialize
      @ruby_version = nil
    end

    def eval_gemfile(gemfile, contents = nil)
      contents ||= File.open(gemfile, "rb") { |f| f.read }
      instance_eval(contents, gemfile.to_s, 1)
    rescue SyntaxError => e
      bt = e.message.split("\n")[1..-1]
      raise GemfileError, ["Gemfile syntax error:", *bt].join("\n")
    rescue ScriptError, RegexpError, NameError, ArgumentError => e
      e.backtrace[0] = "#{e.backtrace[0]}: #{e.message} (#{e.class})"
      STDERR.puts e.backtrace.join("\n       ")
      raise GemfileError, "There was an error in your Gemfile," \
        " and Bundler cannot continue."
    end

    def source(source, options = {})
    end

    def gem(name, *args)
    end

    def group(*args, &blk)
    end
  end
end

dsl = Bundler::Dsl.new
begin
  dsl.eval_gemfile(Bundler::SharedHelpers.default_gemfile)
  ruby_version = dsl.ruby_version
  if ruby_version
    puts ruby_version
  else
    puts "No ruby version specified"
  end
rescue Bundler::GemfileError => e
  puts e.message
  exit(-1)
end
