val src : Logs.src
val save : Fpath.t Current.t -> string Current.t -> unit Current.t
val save_list : (Fpath.t * string) list Current.t -> unit Current.t
val read : Fpath.t Current.t -> string Current.t
val read_dir : ?filter:'a -> Fpath.t Current.t -> (Fpath.t * string) list Current.t