val failwithf : ('a, unit, string, 'b) format4 -> 'a
(** Like [failwith] but supports printf-like arguments. *)
+val (//) : string -> string -> string
+(** The {!Filename.concat} function. *)
+
+val is_directory : string -> bool
+(** Return true iff parameter is a directory. *)
+
val filter_map : ('a -> 'b option) -> 'a list -> 'b list
(** [filter_map f l] applies [f] to every element of [l], filters
out the [None] elements and returns the list of the arguments of
val string_find : string -> string -> int
(** [string_find str sub] finds the index of [sub] in [str]. If
not found, returns -1. *)
+
+val nsplit : ?max:int -> string -> string -> string list
+(** [nsplit ?max sep str] splits [str] into multiple strings at each
+ separator [sep].
+
+ As with the Perl split function, you can give an optional
+ [?max] parameter to limit the number of strings returned. The
+ final element of the list will contain the remainder of the
+ input string. *)
+
+val isspace : char -> bool
+val triml : ?test:(char -> bool) -> string -> string
+val trimr : ?test:(char -> bool) -> string -> string
+val trim : ?test:(char -> bool) -> string -> string
+(** Trim strings at left, right or both. *)
+
+val absolute_path : string -> string
+(** Convert any path into an absolute path. *)