non_empty_string.mli
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(** A string that is guaranteed to be non-empty *)
type t = private string
include Compare.S with type t := t
(** Returns [None] if the original string is empty. *)
val of_string : string -> t option
(** Fails with [Invalid_argument] if the original string is empty. *)
val of_string_exn : string -> t
(** [cat2 a b] concatenates [a] and [b].
[cat2 a ~sep b] concatenates [a], [sep], and [b]. *)
val cat2 : t -> ?sep:string -> t -> t
(** [split_on_last c s] finds the last occurrence of [c] in [s] and returns
the substring before and the substring after.
Returns [None] if [c] is not present in [s] or if one or both substrings
would end up being empty. *)
val split_on_last : char -> t -> (t * t) option