outil/help

Types

UseArgs

A function using the command line arguments which can return command error reasons.

pub type UseArgs(a) =
  fn(List(String)) -> Result(a, Reason)

Functions

wrap_usage

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pub fn wrap_usage(cmd: Command, continue: fn(List(String)) ->
    Result(a, Reason)) -> Result(a, CommandReturn(b))

Given a command, if the command line arguments contain --help or -h then return a help “error” with the usage string. Otherwise, pass the arguments to the given function and if it returns an error, wrap it in a CommandLineError with the usage string.