Put some useful information in the window title

main.c

@@ -31,6 +31,8 @@ void on_keypress(XEvent*);
 void on_configurenotify(XEvent*);
 void on_expose(XEvent*);
 
+void update_title();
+
 static void (*handler[LASTEvent])(XEvent*) = {
 	[Expose] = on_expose,
 	[ConfigureNotify] = on_configurenotify,
@@ -44,6 +46,9 @@ const char **filenames;
 unsigned int filecnt;
 unsigned int fileidx;
 
+#define TITLE_LEN 256
+char win_title[TITLE_LEN];
+
 void run() {
 	XEvent ev;
 
@@ -90,6 +95,7 @@ int main(int argc, char **argv) {
 
 	img_load(&img, filenames[fileidx]);
 	img_display(&img, &win);
+	update_title();
 
 	run();
 
@@ -127,6 +133,7 @@ void on_keypress(XEvent *ev) {
 			if (fileidx + 1 < filecnt) {
 				img_load(&img, filenames[++fileidx]);
 				img_display(&img, &win);
+				update_title();
 			}
 			break;
 		case XK_p:
@@ -134,6 +141,7 @@ void on_keypress(XEvent *ev) {
 			if (fileidx > 0) {
 				img_load(&img, filenames[--fileidx]);
 				img_display(&img, &win);
+				update_title();
 			}
 			break;
 	}
@@ -153,3 +161,18 @@ void on_expose(XEvent *ev) {
 	img_render(&img, &win, ev->xexpose.x, ev->xexpose.y,
 	           ev->xexpose.width, ev->xexpose.height);
 }
+
+void update_title() {
+	int n;
+
+	n = snprintf(win_title, TITLE_LEN, "sxiv: [%d/%d] <%d%%> %s", fileidx + 1,
+	             filecnt, (int) (img.zoom * 100.0), filenames[fileidx]);
+	
+	if (n >= TITLE_LEN) {
+		win_title[TITLE_LEN - 2] = '.';
+		win_title[TITLE_LEN - 3] = '.';
+		win_title[TITLE_LEN - 4] = '.';
+	}
+
+	win_set_title(&win, win_title);
+}

window.c

@@ -72,8 +72,7 @@ void win_open(win_t *win) {
 	XSelectInput(e->dpy, win->xwin,
 	             StructureNotifyMask | ExposureMask | KeyPressMask);
 
-	XStoreName(e->dpy, win->xwin, "sxiv");
-	XSetIconName(e->dpy, win->xwin, "Sxiv");
+	win_set_title(win, "sxiv");
 
 	if ((classhint = XAllocClassHint())) {
 		classhint->res_name = "sxiv";
@@ -94,6 +93,17 @@ void win_close(win_t *win) {
 	XCloseDisplay(win->env.dpy);
 }
 
+void win_set_title(win_t *win, const char *title) {
+	if (!win)
+		return;
+
+	if (!title)
+		title = "sxiv";
+
+	XStoreName(win->env.dpy, win->xwin, title);
+	XSetIconName(win->env.dpy, win->xwin, title);
+}
+
 int win_configure(win_t *win, XConfigureEvent *cev) {
 	int changed;
 

window.h

@@ -46,6 +46,8 @@ typedef struct win_s {
 void win_open(win_t*);
 void win_close(win_t*);
 
+void win_set_title(win_t*, const char*);
+
 int win_configure(win_t*, XConfigureEvent*);
 void win_clear(win_t*);