#include <X11/Xlib.h>
#include <X11/Xmu/WinUtil.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int main(int argc, char **argv)
{
  Display *display;
  Window target;
  char buf[4096];
  if (argc == 1 && snprintf(buf, sizeof(buf), "\"%s\" `xselect`", argv[0]) < sizeof(buf))
    execlp("sh", "sh", "-c", buf, NULL);

  if (argc != 2) {
    char *name;
    name = strrchr(argv[0], '/');
    name = name ? name+1 : argv[0];
    fprintf(stderr, "usage: %s window-id\n", name);
    exit(1);
  }

  target = strtol(argv[1], NULL, 10);

  if ((display = XOpenDisplay(NULL)) == NULL) {
    fprintf(stderr, "cannot open display\n");
    exit(1);
  }

  XUnmapWindow(display, target);

  printf("%ld\n", target);

  XCloseDisplay(display);
  exit(0);
}