(******************************************************************************)

(*  ocaml-fileutils: files and filenames common operations                    *)

(*                                                                            *)

(*  Copyright (C) 2003-2014, Sylvain Le Gall                                  *)

(*                                                                            *)

(*  This library is free software; you can redistribute it and/or modify it   *)

(*  under the terms of the GNU Lesser General Public License as published by  *)

(*  the Free Software Foundation; either version 2.1 of the License, or (at   *)

(*  your option) any later version, with the OCaml static compilation         *)

(*  exception.                                                                *)

(*                                                                            *)

(*  This library is distributed in the hope that it will be useful, but       *)

(*  WITHOUT ANY WARRANTY; without even the implied warranty of                *)

(*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the file         *)

(*  COPYING for more details.                                                 *)

(*                                                                            *)

(*  You should have received a copy of the GNU Lesser General Public License  *)

(*  along with this library; if not, write to the Free Software Foundation,   *)

(*  Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA             *)

(******************************************************************************)

open FilePath_type

include CommonPath

let dir_writer lst =

 let buffer = Buffer.create path_length in

 let rec dir_writer_aux lst =

   match lst with

     Root s :: tl ->

       Buffer.add_string buffer s;

       Buffer.add_char   buffer ':';

       dir_writer_aux tl

   | (CurrentDir _) :: tl

   | ParentDir  :: tl ->

       Buffer.add_char   buffer ':';

       dir_writer_aux tl

   | (Component "") :: tl ->

       dir_writer_aux tl

   | (Component s) :: [] ->

       Buffer.add_string buffer s;

       dir_writer_aux []

   | (Component s) :: tl ->

       Buffer.add_string buffer s;

       Buffer.add_char   buffer ':';

       dir_writer_aux tl

   | [] ->

       Buffer.contents buffer

 in

   match lst with

     ParentDir :: _ -> dir_writer_aux ( (CurrentDir Long) :: lst )

   | [ CurrentDir Short ] -> ""

   | _ -> dir_writer_aux lst

let dir_reader str =

  let rec dir_reader_aux =

    function

    | [""] -> []

    | "" :: tl -> ParentDir :: (dir_reader_aux tl)

    | str :: tl -> Component str :: (dir_reader_aux tl)

    | [] -> []

  in

    match StringExt.split ~map:(fun s -> s) ':' str with

    | [] -> [CurrentDir Short]

    | "" :: tl -> CurrentDir Long :: (dir_reader_aux tl)

    | [id] -> [Component id]

    | root :: tl -> Root root :: (dir_reader_aux tl)

let path_writer lst = String.concat ";" lst

let path_reader = StringExt.split ~map:(fun s -> s) ';'