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gistfile1.rbx

class PedAssignOptions < Struct.new(:links_file, :access_file, :walk_int_file, :output_file); end
class ParseFail < Struct.new(:reason); end

class ArgvParser
  def parse argv
    if argv.size == 1 and ['-h','--help'].include? argv.first then
      return :help
    end
    if argv.length != PedAssignOptions.members.size then
      return ParseFail.new("Incorrect number of arguments, got #{argv.size} expected #{PedAssignOptions.members.size}") 
    end

    missing_files = get_missing_files(argv[0..-2])
    if !missing_files.empty? then
      return ParseFail.new("Could not find files: #{missing_files.join(',')}")
    end

    return parse_it(argv)
  end
  
  private
  def parse_it argv
    return PedAssignOptions.new(*argv)
  end

  def get_missing_files files
    files.select { |f| !File.exist?(f) }
  end
end