code-style: simplify window title related code

instead of dancing around with some `init` parameter, directly give
`win_set_title()` what it needs. `get_win_title()` now also does *just*
what the name says.

this simplifies things quite a bit and the functions now do what their
name implies more closely instead of doing some `init` dance internally.

main.c

@@ -233,35 +233,30 @@ static bool check_timeouts(int *t)
 	return tmin > 0;
 }
 
-size_t get_win_title(unsigned char *buf, int len, bool init)
+static size_t get_win_title(char *buf, size_t len)
 {
 	char *argv[8];
 	spawn_t pfd;
 	char w[12] = "", h[12] = "", z[12] = "", fidx[12], fcnt[12];
 	ssize_t n = -1;
 
-	if (buf == NULL || len <= 0)
+	if (wintitle.f.err || buf == NULL || len == 0)
 		return 0;
 
-	if (init) {
-		n = snprintf((char *)buf, len, "%s", options->res_name != NULL ?
-		             options->res_name : "nsxiv");
-	} else if (!wintitle.f.err) {
-		if (mode == MODE_IMAGE) {
-			snprintf(w, ARRLEN(w), "%d", img.w);
-			snprintf(h, ARRLEN(h), "%d", img.h);
-			snprintf(z, ARRLEN(z), "%d", (int)(img.zoom * 100));
-		}
-		snprintf(fidx, ARRLEN(fidx), "%d", fileidx+1);
-		snprintf(fcnt, ARRLEN(fcnt), "%d", filecnt);
-		construct_argv(argv, ARRLEN(argv), wintitle.f.cmd, files[fileidx].path,
-		               fidx, fcnt, w, h, z, NULL);
-		pfd = spawn(wintitle.f.cmd, argv, X_READ);
-		if (pfd.readfd >= 0) {
-			if ((n = read(pfd.readfd, buf, len-1)) > 0)
-				buf[n] = '\0';
-			close(pfd.readfd);
-		}
+	if (mode == MODE_IMAGE) {
+		snprintf(w, ARRLEN(w), "%d", img.w);
+		snprintf(h, ARRLEN(h), "%d", img.h);
+		snprintf(z, ARRLEN(z), "%d", (int)(img.zoom * 100));
+	}
+	snprintf(fidx, ARRLEN(fidx), "%d", fileidx+1);
+	snprintf(fcnt, ARRLEN(fcnt), "%d", filecnt);
+	construct_argv(argv, ARRLEN(argv), wintitle.f.cmd, files[fileidx].path,
+	               fidx, fcnt, w, h, z, NULL);
+	pfd = spawn(wintitle.f.cmd, argv, X_READ);
+	if (pfd.readfd >= 0) {
+		if ((n = read(pfd.readfd, buf, len-1)) > 0)
+			buf[n] = '\0';
+		close(pfd.readfd);
 	}
 
 	return MAX(0, n);
@@ -455,7 +450,11 @@ void redraw(void)
 	}
 	update_info();
 	if (title_dirty) {
-		win_set_title(&win, false);
+		size_t n;
+		char buf[512];
+
+		if ((n = get_win_title(buf, sizeof(buf))) > 0)
+			win_set_title(&win, buf, n);
 		title_dirty = false;
 	}
 	win_draw(&win);

nsxiv.h

@@ -438,7 +438,7 @@ void win_toggle_bar(win_t*);
 void win_clear(win_t*);
 void win_draw(win_t*);
 void win_draw_rect(win_t*, int, int, int, int, bool, int, unsigned long);
-void win_set_title(win_t*, bool);
+void win_set_title(win_t*, const char*, size_t);
 void win_set_cursor(win_t*, cursor_t);
 void win_cursor_pos(win_t*, int*, int*);
 
@@ -454,7 +454,6 @@ void clear_resize(void);
 void remove_file(int, bool);
 void set_timeout(timeout_f, int, bool);
 void reset_timeout(timeout_f);
-size_t get_win_title(unsigned char*, int, bool);
 void close_info(void);
 void open_info(void);
 void load_image(int);

window.c

@@ -288,7 +288,7 @@ void win_open(win_t *win)
 	}
 	free(icon_data);
 
-	win_set_title(win, true);
+	win_set_title(win, res_name, strlen(res_name));
 	classhint.res_class = res_class;
 	classhint.res_name = options->res_name != NULL ? options->res_name : res_name;
 	XSetClassHint(e->dpy, win->xwin, &classhint);
@@ -504,17 +504,14 @@ void win_draw_rect(win_t *win, int x, int y, int w, int h, bool fill, int lw,
 		XDrawRectangle(win->env.dpy, win->buf.pm, gc, x, y, w, h);
 }
 
-void win_set_title(win_t *win, bool init)
+void win_set_title(win_t *win, const char *title, size_t len)
 {
-	size_t len, i;
-	unsigned char title[512];
-	int targets[] = { ATOM_WM_NAME, ATOM_WM_ICON_NAME, ATOM__NET_WM_NAME, ATOM__NET_WM_ICON_NAME };
-
-	if ((len = get_win_title(title, ARRLEN(title), init)) > 0) {
-		for (i = 0; i < ARRLEN(targets); ++i) {
-			XChangeProperty(win->env.dpy, win->xwin, atoms[targets[i]],
-			                atoms[ATOM_UTF8_STRING], 8, PropModeReplace, title, len);
-		}
+	int i, targets[] = { ATOM_WM_NAME, ATOM_WM_ICON_NAME, ATOM__NET_WM_NAME, ATOM__NET_WM_ICON_NAME };
+
+	for (i = 0; i < ARRLEN(targets); ++i) {
+		XChangeProperty(win->env.dpy, win->xwin, atoms[targets[i]],
+		                atoms[ATOM_UTF8_STRING], 8, PropModeReplace,
+		                (unsigned char *)title, len);
 	}
 }