/* See LICENSE file for details. */
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>

void
eprint(const char *errstr, ...) {
	va_list ap;

	va_start(ap, errstr);
	vfprintf(stderr, errstr, ap);
	va_end(ap);
	exit(EXIT_FAILURE);
}

int
main(int argc, char **argv) {
	Display *dpy;
	Window root, dummy;
	Atom netwmcheck, netwmname, utf8_string;

	if(argc == 2) {
		if(!strncmp(argv[1], "-v", 3))
			eprint("setwmname-"VERSION", © 2008 Anselm R Garbe\n", stdout);
	}
	else
		eprint("usage: setwmname <name> [-v]\n");

	if(!(dpy = XOpenDisplay(0)))
		eprint("setwmname: cannot open display\n");
	root = DefaultRootWindow(dpy);
	netwmcheck = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
	netwmname = XInternAtom(dpy, "_NET_WM_NAME", False);
	utf8_string = XInternAtom(dpy, "UTF8_STRING", False);
	XChangeProperty(dpy, root, netwmcheck, XA_WINDOW, 32, PropModeReplace, (unsigned char *)&root, 1);
	XChangeProperty(dpy, root, netwmname, utf8_string, 8, PropModeReplace, (unsigned char *)argv[1], strlen(argv[1]));
	XSync(dpy, False);
	XCloseDisplay(dpy);
	return 0;
}