(* Title: Pure/ML-Systems/windows_path.ML
Author: Makarius
Windows file-system paths.
*)
fun ml_platform_path path =
if String.isPrefix "/" path andalso not (String.isPrefix "//" path) then
(case String.tokens (fn c => c = #"/") path of
"cygdrive" :: drive :: arcs =>
let
val vol =
(case Char.fromString drive of
NONE => drive ^ ":"
| SOME d => String.str (Char.toUpper d) ^ ":");
in String.concatWith "\\" (vol :: arcs) end
| arcs =>
(case OS.Process.getEnv "CYGWIN_ROOT" of
SOME root => OS.Path.concat (root, String.concatWith "\\" arcs)
| NONE => raise Fail "Unknown environment variable CYGWIN_ROOT"))
else String.translate (fn #"/" => "\\" | c => String.str c) path;
fun ml_standard_path path =
let
val {vol, arcs, isAbs} = OS.Path.fromString path;
val path' = String.translate (fn #"\\" => "/" | c => String.str c) path;
in
if isAbs then
(case String.explode vol of
[d, #":"] =>
String.concatWith "/" ("/cygdrive" :: String.str (Char.toLower d) :: arcs)
| _ => path')
else path'
end;