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

(*  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 rec dir_writer lst =

  match lst with

    Root _ :: tl -> "/"^(dir_writer tl)

  | [ CurrentDir Short ] -> ""

  | lst ->

    let dir_writer_aux cmp =

      match cmp with

        Root _ -> ""

      | ParentDir -> ".."

      | CurrentDir _ -> "."

      | Component s -> s

    in

    String.concat "/" ( List.map dir_writer_aux lst )

let dir_reader fn =

  let sep = '/' in

  let fn_part_of_string =

    function

      | "." -> CurrentDir Long

      | ".." -> ParentDir

      | str -> Component str

  in

  if (String.length fn) > 0 then begin

    if fn.[0] = sep then

      StringExt.split

        ~start_acc:[Root ""]

        ~start_pos:1

        ~map:fn_part_of_string

        sep

        fn

    else

      StringExt.split

        ~map:fn_part_of_string

        sep

        fn

  end else

    [CurrentDir Short]

let path_writer lst = String.concat ":" lst

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

let fast_concat fn1 fn2 =

  let fn1_len = String.length fn1 in

  if fn1_len = 0 || fn1.[fn1_len - 1] = '/' then

    fn1 ^ fn2

  else

    fn1 ^ "/" ^ fn2

let fast_basename fn =

  try

    let start_pos = (String.rindex fn '/') + 1 in

    let fn_len = String.length fn in

    if start_pos = fn_len then

      ""

    else

      String.sub fn start_pos (fn_len - start_pos)

  with Not_found ->

    fn

let fast_dirname fn =

  try

    let last_pos = String.rindex fn '/' in

    if last_pos = 0 then

      "/"

    else

      String.sub fn 0 last_pos

  with Not_found ->

    ""

let fast_is_relative fn =

  if String.length fn = 0 || fn.[0] <> '/' then

    true

  else

    false

let fast_is_current fn =

  if String.length fn = 0 || fn = "." then

    true

  else if fn.[0] <> '.' then

    false

  else

    raise CannotHandleFast

let fast_is_parent fn =

  if fn = ".." then

    true

  else if String.length fn < 2 || fn.[0] <> '.' || fn.[1] <> '.' then

    false

  else

    raise CannotHandleFast