Make `createDir` more robust

Should now properly work for root directories on Windows (after isAbsolute
is fixed)

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/pure/os.nim b/lib/pure/os.nim
index 88b1bd280..83d98a3fe 100644
--- a/lib/pure/os.nim
+++ b/lib/pure/os.nim
@@ -1064,8 +1064,10 @@ proc createDir*(dir: string) {.rtl, extern: "nos$1", tags: [WriteDirEffect].} =
         omitNext = false
       else:
         discard tryCreateDir(substr(dir, 0, i-1))
+
   # The loop does not create the dir itself if it doesn't end in separator
-  if dir[^1] notin {DirSep, AltSep}:
+  if dir.len > 0 and not omitNext and
+     dir[^1] notin {DirSep, AltSep}:
     discard tryCreateDir(dir)
 
 proc copyDir*(source, dest: string) {.rtl, extern: "nos$1",