(******************************************************************************)
(*  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) ';'
