feat: add centerwin dispatch

src/config/parse_config.h

@@ -708,6 +708,8 @@ FuncType parse_func_name(char *func_name, Arg *arg, char *arg_value,
 		func = tagtoright;
 	} else if (strcmp(func_name, "killclient") == 0) {
 		func = killclient;
+	} else if (strcmp(func_name, "centerwin") == 0) {
+		func = centerwin;
 	} else if (strcmp(func_name, "focuslast") == 0) {
 		func = focuslast;
 	} else if (strcmp(func_name, "setlayout") == 0) {

src/dispatch/bind_declare.h

@@ -38,6 +38,7 @@ void chvt(const Arg *arg);
 void reload_config(const Arg *arg);
 void smartmovewin(const Arg *arg);
 void smartresizewin(const Arg *arg);
+void centerwin(const Arg *arg);
 void bind_to_view(const Arg *arg);
 void toggletag(const Arg *arg);
 void toggleview(const Arg *arg);

src/dispatch/bind_define.h

@@ -601,6 +601,20 @@ void smartresizewin(const Arg *arg) {
 	resize(c, c->oldgeom, 1);
 }
 
+void centerwin(const Arg *arg) {
+	Client *c;
+	c = selmon->sel;
+
+	if (!c || c->isfullscreen)
+		return;
+	if (!c->isfloating)
+		setfloating(c, true);
+
+	c->oldgeom = setclient_coordinate_center(c, c->geom, 0, 0);
+
+	resize(c, c->oldgeom, 1);
+}
+
 void spawn(const Arg *arg) {
 
 	if (!arg->v)