Use -e for X window embedding

Makefile

@@ -1,4 +1,4 @@
-VERSION   := git-20161020
+VERSION   := git-20161030
 
 PREFIX    := /usr/local
 MANPREFIX := $(PREFIX)/share/man

options.c

@@ -32,8 +32,8 @@ const options_t *options = (const options_t*) &_options;
 
 void print_usage(void)
 {
-	printf("usage: sxiv [-abcfhioqrtvZ] [-G GAMMA] [-g GEOMETRY] [-n NUM] "
-	       "[-N NAME] [-S DELAY] [-s MODE] [-z ZOOM] [-w WID] FILES...\n");
+	printf("usage: sxiv [-abcfhioqrtvZ] [-e WID] [-G GAMMA] [-g GEOMETRY] "
+	       "[-N NAME] [-n NUM] [-S DELAY] [-s MODE] [-z ZOOM] FILES...\n");
 }
 
 void print_version(void)
@@ -71,7 +71,7 @@ void parse_options(int argc, char **argv)
 	_options.thumb_mode = false;
 	_options.clean_cache = false;
 
-	while ((opt = getopt(argc, argv, "abcfG:g:hin:N:oqrS:s:tvw:Zz:")) != -1) {
+	while ((opt = getopt(argc, argv, "abce:fG:g:hin:N:oqrS:s:tvZz:")) != -1) {
 		switch (opt) {
 			case '?':
 				print_usage();
@@ -85,6 +85,12 @@ void parse_options(int argc, char **argv)
 			case 'c':
 				_options.clean_cache = true;
 				break;
+			case 'e':
+				n = strtol(optarg, &end, 0);
+				if (*end != '\0')
+					error(EXIT_FAILURE, 0, "Invalid argument for option -e: %s", optarg);
+				_options.embed = n;
+				break;
 			case 'f':
 				_options.fullscreen = true;
 				break;
@@ -139,12 +145,6 @@ void parse_options(int argc, char **argv)
 			case 'v':
 				print_version();
 				exit(EXIT_SUCCESS);
-			case 'w':
-				n = strtol(optarg, &end, 0);
-				if (*end != '\0')
-					error(EXIT_FAILURE, 0, "Invalid argument for option -w: %s", optarg);
-				_options.embed = n;
-				break;
 			case 'Z':
 				_options.scalemode = SCALE_ZOOM;
 				_options.zoom = 1.0;

window.c

@@ -133,7 +133,6 @@ void win_init(win_t *win)
 	win->bar.l.buf = emalloc(win->bar.l.size);
 	win->bar.r.buf = emalloc(win->bar.r.size);
 	win->bar.h = options->hide_bar ? 0 : barheight;
-	win->embed = options->embed;
 
 	INIT_ATOM_(WM_DELETE_WINDOW);
 	INIT_ATOM_(_NET_WM_NAME);
@@ -149,6 +148,7 @@ void win_init(win_t *win)
 void win_open(win_t *win)
 {
 	int c, i, j, n;
+	long parent;
 	win_env_t *e;
 	XClassHint classhint;
 	unsigned long *icon_data;
@@ -160,6 +160,7 @@ void win_open(win_t *win)
 	Bool fullscreen = options->fullscreen && fs_support;
 
 	e = &win->env;
+	parent = options->embed != 0 ? options->embed : RootWindow(e->dpy, e->scr);
 
 	sizehints.flags = PWinGravity;
 	sizehints.win_gravity = NorthWestGravity;
@@ -198,10 +199,7 @@ void win_open(win_t *win)
 		win->y = 0;
 	}
 
-	if (!(win->embed)) {
-		win->embed = RootWindow(e->dpy, e->scr);
-	}
-	win->xwin = XCreateWindow(e->dpy, win->embed,
+	win->xwin = XCreateWindow(e->dpy, parent,
 	                          win->x, win->y, win->w, win->h, 0,
 	                          e->depth, InputOutput, e->vis, 0, NULL);
 	if (win->xwin == None)

window.h

@@ -71,7 +71,6 @@ typedef struct {
 	unsigned int bw;
 
 	bool fullscreen;
-	long embed;
 
 	struct {
 		int w;