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#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef enum {
CAPTURE_TYPE_FOCUSED,
CAPTURE_TYPE_CURSOR
} capture_type;
static bool window_has_atom(Display *dpy, Window window, Atom atom) {
Atom type;
unsigned long len, bytes_left;
int format;
unsigned char *properties = NULL;
if(XGetWindowProperty(dpy, window, atom, 0, 1024, False, AnyPropertyType, &type, &format, &len, &bytes_left, &properties) < Success)
return false;
if(properties)
XFree(properties);
return type != None;
}
static bool window_is_user_program(Display *dpy, Window window) {
const Atom net_wm_state_atom = XInternAtom(dpy, "_NET_WM_STATE", False);
const Atom wm_state_atom = XInternAtom(dpy, "WM_STATE", False);
return window_has_atom(dpy, window, net_wm_state_atom) || window_has_atom(dpy, window, wm_state_atom);
}
static Window get_window_at_cursor_position(Display *dpy) {
Window root_window = None;
Window window = None;
int dummy_i;
unsigned int dummy_u;
int cursor_pos_x = 0;
int cursor_pos_y = 0;
XQueryPointer(dpy, DefaultRootWindow(dpy), &root_window, &window, &dummy_i, &dummy_i, &cursor_pos_x, &cursor_pos_y, &dummy_u);
return window;
}
static Window get_focused_window(Display *dpy, capture_type cap_type) {
const Atom net_active_window_atom = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
Window focused_window = None;
if(cap_type == CAPTURE_TYPE_FOCUSED) {
// Atom type = None;
// int format = 0;
// unsigned long num_items = 0;
// unsigned long bytes_left = 0;
// unsigned char *data = NULL;
// XGetWindowProperty(dpy, DefaultRootWindow(dpy), net_active_window_atom, 0, 1, False, XA_WINDOW, &type, &format, &num_items, &bytes_left, &data);
// fprintf(stderr, "focused window: %p\n", (void*)data);
// if(type == XA_WINDOW && num_items == 1 && data)
// return *(Window*)data;
int revert_to = 0;
XGetInputFocus(dpy, &focused_window, &revert_to);
if(focused_window && focused_window != DefaultRootWindow(dpy) && window_is_user_program(dpy, focused_window))
return focused_window;
}
focused_window = get_window_at_cursor_position(dpy);
if(focused_window && focused_window != DefaultRootWindow(dpy) && window_is_user_program(dpy, focused_window))
return focused_window;
return None;
}
static char* get_window_title(Display *dpy, Window window) {
const Atom net_wm_name_atom = XInternAtom(dpy, "_NET_WM_NAME", False);
const Atom wm_name_atom = XInternAtom(dpy, "_NET_WM_NAME", False);
const Atom utf8_string_atom = XInternAtom(dpy, "UTF8_STRING", False);
Atom type = None;
int format = 0;
unsigned long num_items = 0;
unsigned long bytes_left = 0;
unsigned char *data = NULL;
XGetWindowProperty(dpy, window, net_wm_name_atom, 0, 1024, False, utf8_string_atom, &type, &format, &num_items, &bytes_left, &data);
if(type == utf8_string_atom && format == 8 && data)
return (char*)data;
type = None;
format = 0;
num_items = 0;
bytes_left = 0;
data = NULL;
XGetWindowProperty(dpy, window, wm_name_atom, 0, 1024, False, 0, &type, &format, &num_items, &bytes_left, &data);
if((type == XA_STRING || type == utf8_string_atom) && data)
return (char*)data;
return NULL;
}
static const char* strip(const char *str, int *len) {
int str_len = strlen(str);
for(int i = 0; i < str_len; ++i) {
if(str[i] != ' ') {
str += i;
str_len -= i;
break;
}
}
for(int i = str_len - 1; i >= 0; --i) {
if(str[i] != ' ') {
str_len = i + 1;
break;
}
}
*len = str_len;
return str;
}
static void print_str_strip(const char *str) {
int len = 0;
str = strip(str, &len);
printf("%.*s", len, str);
}
static int x11_ignore_error(Display *dpy, XErrorEvent *error_event) {
(void)dpy;
(void)error_event;
return 0;
}
static void usage(void) {
fprintf(stderr, "usage: gsr-window-name <focused|cursor>\n");
fprintf(stderr, "options:\n");
fprintf(stderr, " focused The class/name of the focused window is returned. If no window is focused then the window beneath the cursor is returned instead\n");
fprintf(stderr, " cursor The class/name of the window beneath the cursor is returned\n");
exit(1);
}
int main(int argc, char **argv) {
if(argc != 2)
usage();
const char *cap_type_str = argv[1];
capture_type cap_type = CAPTURE_TYPE_FOCUSED;
if(strcmp(cap_type_str, "focused") == 0) {
cap_type = CAPTURE_TYPE_FOCUSED;
} else if(strcmp(cap_type_str, "cursor") == 0) {
cap_type = CAPTURE_TYPE_CURSOR;
} else {
fprintf(stderr, "error: invalid option '%s', expected either 'focused' or 'cursor'\n", cap_type_str);
usage();
}
Display *dpy = XOpenDisplay(NULL);
if(!dpy) {
fprintf(stderr, "Error: failed to connect to the X11 server\n");
exit(1);
}
XSetErrorHandler(x11_ignore_error);
const Window focused_window = get_focused_window(dpy, cap_type);
if(focused_window == None)
exit(2);
// Window title is not always ideal (for example for a browser), but for games its pretty much required
char *window_title = get_window_title(dpy, focused_window);
if(window_title) {
print_str_strip(window_title);
exit(0);
}
XClassHint class_hint = {0};
XGetClassHint(dpy, focused_window, &class_hint);
if(class_hint.res_class) {
print_str_strip(class_hint.res_class);
exit(0);
}
return 2;
}
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