diff --git a/patch/keymodes.c b/patch/keymodes.c
new file mode 100644
index 0000000..45af3c5
--- /dev/null
+++ b/patch/keymodes.c
@@ -0,0 +1,143 @@
+/* function implementations */
+void
+clearcmd(const Arg *arg)
+{
+	unsigned int i;
+
+	for (i = 0; i < LENGTH(cmdkeysym); i++) {
+		cmdkeysym[i] = 0;
+		cmdmod[i] = 0;
+	}
+}
+
+void
+grabkeys(void)
+{
+	if (keymode == INSERTMODE) {
+		grabdefkeys();
+	} else if (keymode == COMMANDMODE) {
+		XUngrabKey(dpy, AnyKey, AnyModifier, root);
+		XGrabKey(dpy, AnyKey, AnyModifier, root,
+			 True, GrabModeAsync, GrabModeAsync);
+	}
+}
+
+int
+isprotodel(Client *c)
+{
+	int n;
+	Atom *protocols;
+	int ret = 0;
+
+	if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
+		while (!ret && n--)
+			ret = protocols[n] == wmatom[WMDelete];
+		XFree(protocols);
+	}
+	return ret;
+}
+
+
+void
+keypress(XEvent *e)
+{
+	unsigned int i, j;
+	Arg a = {0};
+	Bool ismatch = False, maybematch = False;
+	KeySym keysym;
+	XKeyEvent *ev;
+
+	if (keymode == INSERTMODE)
+		keydefpress(e);
+	else if (keymode == COMMANDMODE) {
+		ev = &e->xkey;
+		keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
+		if (keysym < XK_Shift_L || keysym > XK_Hyper_R) {
+			for (i = 0; i < LENGTH(cmdkeys); i++)
+				if (keysym == cmdkeys[i].keysym
+				&& CLEANMASK(cmdkeys[i].mod) == CLEANMASK(ev->state)
+				&& cmdkeys[i].func) {
+					cmdkeys[i].func(&(cmdkeys[i].arg));
+					ismatch = True;
+					break;
+				}
+			if (!ismatch) {
+				for (j = 0; j < LENGTH(cmdkeysym); j++)
+					if (cmdkeysym[j] == 0) {
+						cmdkeysym[j] = keysym;
+						cmdmod[j] = ev->state;
+						break;
+					}
+				for (i = 0; i < LENGTH(commands); i++) {
+					for (j = 0; j < LENGTH(cmdkeysym); j++) {
+						if (cmdkeysym[j] == commands[i].keysym[j]
+						&& CLEANMASK(cmdmod[j]) == CLEANMASK(commands[i].mod[j]))
+							ismatch = True;
+						else if (cmdkeysym[j] == 0
+						&& cmdmod[j] == 0) {
+							ismatch = False;
+							maybematch = True;
+							break;
+						} else {
+							ismatch = False;
+							break;
+						}
+					}
+					if (ismatch) {
+						if (commands[i].func)
+							commands[i].func(&(commands[i].arg));
+						clearcmd(&a);
+						break;
+					}
+
+				}
+				if (!maybematch)
+					clearcmd(&a);
+			}
+		}
+	}
+}
+
+void
+onlyclient(const Arg *arg)
+{
+	Client *c;
+	XEvent ev;
+
+	if (!selmon->sel)
+		return;
+	for (c = selmon->clients; c; c = c->next) {
+		if (c != selmon->sel && ISVISIBLE(c)) {
+			if (isprotodel(c)) {
+				ev.type = ClientMessage;
+				ev.xclient.window = c->win;
+				ev.xclient.message_type = wmatom[WMProtocols];
+				ev.xclient.format = 32;
+				ev.xclient.data.l[0] = wmatom[WMDelete];
+				ev.xclient.data.l[1] = CurrentTime;
+				XSendEvent(dpy, c->win, False, NoEventMask, &ev);
+			}
+			else {
+				XGrabServer(dpy);
+				XSetErrorHandler(xerrordummy);
+				XSetCloseDownMode(dpy, DestroyAll);
+				XKillClient(dpy, c->win);
+				XSync(dpy, False);
+				XSetErrorHandler(xerror);
+				XUngrabServer(dpy);
+			}
+		}
+	}
+}
+
+void
+setkeymode(const Arg *arg)
+{
+	Arg a = {0};
+
+	if (!arg)
+		return;
+	keymode = arg->ui;
+	clearcmd(&a);
+	grabkeys();
+}
\ No newline at end of file
diff --git a/patch/keymodes.h b/patch/keymodes.h
new file mode 100644
index 0000000..3a13163
--- /dev/null
+++ b/patch/keymodes.h
@@ -0,0 +1,21 @@
+#define COMMANDMODE             1
+#define INSERTMODE              2
+
+typedef struct {
+	unsigned int mod[4];
+	KeySym keysym[4];
+	void (*func)(const Arg *);
+	const Arg arg;
+} Command;
+
+static void clearcmd(const Arg *arg);
+static void grabkeys(void);
+static int isprotodel(Client *c);
+static void keypress(XEvent *e);
+static void onlyclient(const Arg *arg);
+static void setkeymode(const Arg *arg);
+
+/* variables */
+static unsigned int cmdmod[4];
+static unsigned int keymode = INSERTMODE;
+static KeySym cmdkeysym[4];
\ No newline at end of file