/* 
 * A simple example of setting the XUrgencyHint on an xterm from a program
 * running in it. Compile with:
 * 
 *     gcc -L/usr/X11R6/lib -lX11 urgent.c -o urgent
 * 
 */

#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>


static int set_urgency(Display *dpy, Window id, int set)
{
    XWMHints *hints=XGetWMHints(dpy, id);
    
    if(hints==NULL)
        return 0;
    
    if(set)
        hints->flags|=XUrgencyHint;
    else
        hints->flags&=~XUrgencyHint;
    
    return (XSetWMHints(dpy, id, hints)!=0);
}


int main(void)
{
    Display *dpy;
    const char *ids;
    Window id;
    
    ids=getenv("WINDOWID");
    
    if(ids==NULL){
        fprintf(stderr, "WINDOWID not set.");
        return EXIT_FAILURE;
    }
    
    id=atoi(ids);
    
    dpy=XOpenDisplay(NULL);
    
    if(dpy==NULL){
        fprintf(stderr, "Unable to open display.");
        return EXIT_FAILURE;
    }
    
    /* Set the flag */
    if(!set_urgency(dpy, id, 1)){
        XCloseDisplay(dpy);
        fprintf(stderr, "Unable to set urgency.");
        return EXIT_FAILURE;
    }
        
    XFlush(dpy);
    
    /* Wait for a keypress */
    getchar();

    /* Unset the flag */
    if(!set_urgency(dpy, id, 0)){
        XCloseDisplay(dpy);
        fprintf(stderr, "Unable to unset urgency.");
        return EXIT_FAILURE;
    }
    XFlush(dpy);
    
    XCloseDisplay(dpy);
    
    return EXIT_SUCCESS;
}