class Pfm::CLI

def run
  subcommand_name, *subcommand_params = argv
  ENV['DEBUG'] = true if verbose?
  #
  # Runs the appropriate subcommand if the given parameters contain any
  # subcommands.
  #
  if subcommand_name.nil? || option?(subcommand_name)
    handle_options
  elsif have_command?(subcommand_name)
    Tracer.on if verbose?
    subcommand = instantiate_subcommand(subcommand_name)
    exit_code = subcommand.run_with_default_options(subcommand_params)
    Tracer.off if verbose?
    exit normalized_exit_code(exit_code)
  else
    err "Unknown command `#{subcommand_name}'."
    show_help
    exit 1
  end
rescue OptionParser::InvalidOption => e
  err(e.message)
  show_help
  exit 1
end