simplifyPath.nim

proc simplifyPath(path: string): string =
  ## Simplify a path, removing '..' and '.', double
  result = path
  var
    bounds = newSeq[int]()
    writePos, readPos = 0
  while readPos < path.len():
    if path[readPos] == '/':
      if path[readPos+1] == '/': # Handle redundant path separator tokens.
        while path[readPos+1] == '/':
          readPos.inc()
        readPos.dec()
      elif path[readPos+1 .. readPos+3] == "../": # Handle parent dir tokens
        writePos = bounds.pop()
        readPos.inc(3)
      elif path[readPos+1 .. readPos+2] == "./": # Handle current dir tokens
        readPos.inc(2)
      else:
        bounds.add(readPos)
        echo(repr(bounds))
    result[writePos] = path[readPos]
    writePos.inc
    readPos.inc
  result.setLen(writePos)
 


echo simplifyPath("/User/.//Clay/../Ben/")