consider execute field

[jmbarbone]

Function that is to be run with the value of the parameter

scribe_help_arg <- function() {
  new_arg(
    aliases = "--help",
    action = "flag",
    default = FALSE,
    n = 0,
    info = "prints this and quietly exits",
    options = list(no = FALSE),
    stop = "hard",
    execute = function() {
      if (isTRUE(self$values$help)) {
        self$help()
        exit()
        return(invisible(self))
      }
    }
  )
}

May need a warning "For expert usage only". May be able to redefine an execution field after looping through each each/parsed value.