Anons (core.Core.Command.Anons)

type +'a t

A specification of some number of anonymous arguments.

val (%:) : string ‑> 'a Arg_type.t ‑> 'a t

(name %: typ) specifies a required anonymous argument of type typ.

The name must not be surrounded by whitespace; if it is, an exn will be raised.

If the name is surrounded by a special character pair (<>, {}, [] or (),) name will remain as-is, otherwise, name will be uppercased.

In the situation where name is only prefixed or only suffixed by one of the special character pairs, or different pairs are used (e.g., "<ARG]"), an exn will be raised.

The (possibly transformed) name is mentioned in the generated help for the command.

val sequence : 'a t ‑> 'a list t

sequence anons specifies a sequence of anonymous arguments. An exception will be raised if anons matches anything other than a fixed number of anonymous arguments.

val non_empty_sequence_as_pair : 'a t ‑> ('a * 'a list) t

non_empty_sequence_as_pair anons and non_empty_sequence_as_list anons are like sequence anons except that an exception will be raised if there is not at least one anonymous argument given.

val non_empty_sequence_as_list : 'a t ‑> 'a list t

val maybe : 'a t ‑> 'a option t

(maybe anons) indicates that some anonymous arguments are optional.

val maybe_with_default : 'a ‑> 'a t ‑> 'a t

(maybe_with_default default anons) indicates an optional anonymous argument with a default value.

t2, t3, and t4 each concatenate multiple anonymous argument specs into a single one. The purpose of these combinators is to allow for optional sequences of anonymous arguments. Consider a command with usage:

where the second and third anonymous arguments must either both be there or both not be there. This can be expressed as: