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#define _POSIX_C_SOURCE 200809L
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <X11/Xlib.h>
#define WM_STATE_FORMAT 32
static Bool is_normal(Display *dpy, Window win)
{
static Atom state = None;
if (state == None) {
state = XInternAtom(dpy, "WM_STATE", True);
if (state == None) {
return False;
}
}
Atom type = AnyPropertyType;
int format = WM_STATE_FORMAT;
unsigned long nitems = 0;
unsigned long bytes = 0;
unsigned char *prop = NULL;
int r = XGetWindowProperty(dpy,
win,
state,
0,
0,
False,
type,
&type,
&format,
&nitems,
&bytes,
&prop);
if (r == Success && prop != NULL) {
XFree(prop);
return True;
}
return False;
}
static int compar(const void *a, const void *b)
{
const Window *wina = a;
const Window *winb = b;
if (*wina > *winb) {
return 1;
}
if (*wina < *winb) {
return -1;
}
return 0;
}
static Window *walk_tree(Display *dpy, Window win, Window *list, size_t *nwin)
{
Window root = win, parent = win, *children = NULL;
unsigned int nchildren = 0;
if (!XQueryTree(dpy, win, &root, &parent, &children, &nchildren)) {
return NULL;
}
for (unsigned int i = 0; i < nchildren; i++) {
list = walk_tree(dpy, children[i], list, nwin);
if (is_normal(dpy, children[i])) {
list = realloc(list, sizeof(*list) * (*nwin + 1));
if (list == NULL) {
return NULL;
}
list[*nwin] = children[i];
(*nwin)++;
}
}
return list;
}
int switch_to(Display *dpy, Window prev, Window win)
{
XMapRaised(dpy, win);
XRaiseWindow(dpy, win);
/* TODO: move pointer to the middle of the window */
XWarpPointer(dpy, prev, win, 0, 0, 0, 0, 0, 0);
XSetInputFocus(dpy, win, RevertToNone, CurrentTime);
XCloseDisplay(dpy);
return 0;
}
Window find_normal_parent(Display *dpy, Window win)
{
if (win == PointerRoot || win == None || is_normal(dpy, win)) {
return win;
}
Window root = win, parent = win, *children = NULL;
unsigned int nchildren = 0;
if (!XQueryTree(dpy, win, &root, &parent, &children, &nchildren)) {
return None;
}
if (parent == win || is_normal(dpy, parent)) {
return parent;
}
return find_normal_parent(dpy, win);
}
int main(int argc, char *argv[])
{
int previous = 0;
int c = 0;
while ((c = getopt(argc, argv, "p")) != -1) {
switch (c) {
case 'p':
previous = 1;
break;
default:
return 1;
}
}
Display *dpy = XOpenDisplay("");
Window root = XDefaultRootWindow(dpy);
Window focused = root;
int revert = RevertToNone;
XGetInputFocus(dpy, &focused, &revert);
focused = find_normal_parent(dpy, focused);
size_t nwin = 0;
Window *list = walk_tree(dpy, root, NULL, &nwin);
if (list == NULL) {
return 1;
}
qsort(list, nwin, sizeof(*list), compar);
if (focused == PointerRoot || focused == None) {
return switch_to(dpy, root, list[previous ? nwin - 1 : 0]);
}
for (size_t i = 0; i < nwin; i++) {
if (list[i] == focused) {
return switch_to(dpy, focused, list[(i + (previous ? -1 : 1)) % nwin]);
}
}
return 1;
}
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