New command: i_alternate, go to last image, issue #65

commands.c

@@ -46,6 +46,7 @@ extern win_t win;
 
 extern fileinfo_t *files;
 extern int filecnt, fileidx;
+extern int alternate;
 
 extern int prefix;
 
@@ -155,6 +156,15 @@ bool i_navigate(arg_t a) {
 	return false;
 }
 
+bool i_alternate(arg_t a) {
+	if (mode == MODE_IMAGE) {
+		load_image(alternate);
+		return true;
+	} else {
+		return false;
+	}
+}
+
 bool it_first(arg_t a) {
 	if (mode == MODE_IMAGE && fileidx != 0) {
 		load_image(0);