dwl-patches/patches/gamepad-bindings/gamepad-bindings.patch

diff --git a/Makefile b/Makefile
index 578194f..601c70e 100644
--- a/Makefile
+++ b/Makefile
@@ -12,16 +12,17 @@ DWLDEVCFLAGS = -g -Wpedantic -Wall -Wextra -Wdeclaration-after-statement \
 	-Wfloat-conversion
 
 # CFLAGS / LDFLAGS
-PKGS      = wayland-server xkbcommon libinput $(XLIBS)
+PKGS      = wayland-server xkbcommon libinput libevdev libudev $(XLIBS)
 DWLCFLAGS = `$(PKG_CONFIG) --cflags $(PKGS)` $(WLR_INCS) $(DWLCPPFLAGS) $(DWLDEVCFLAGS) $(CFLAGS)
 LDLIBS    = `$(PKG_CONFIG) --libs $(PKGS)` $(WLR_LIBS) -lm $(LIBS)
 
 all: dwl
-dwl: dwl.o util.o
-	$(CC) dwl.o util.o $(DWLCFLAGS) $(LDFLAGS) $(LDLIBS) -o $@
-dwl.o: dwl.c client.h config.h config.mk cursor-shape-v1-protocol.h \
+dwl: dwl.o gamepad.o util.o
+	$(CC) dwl.o gamepad.o util.o $(DWLCFLAGS) $(LDFLAGS) $(LDLIBS) -o $@
+dwl.o: dwl.c client.h gamepad.h config.h config.mk cursor-shape-v1-protocol.h \
 	pointer-constraints-unstable-v1-protocol.h wlr-layer-shell-unstable-v1-protocol.h \
 	wlr-output-power-management-unstable-v1-protocol.h xdg-shell-protocol.h
+gamepad.o: gamepad.c gamepad.h
 util.o: util.c util.h
 
 # wayland-scanner is a tool which generates C headers and rigging for Wayland
@@ -54,7 +55,7 @@ clean:
 dist: clean
 	mkdir -p dwl-$(VERSION)
 	cp -R LICENSE* Makefile CHANGELOG.md README.md client.h config.def.h \
-		config.mk protocols dwl.1 dwl.c util.c util.h dwl.desktop \
+		config.mk protocols dwl.1 dwl.c gamepad.c gamepad.h util.c util.h dwl.desktop \
 		dwl-$(VERSION)
 	tar -caf dwl-$(VERSION).tar.gz dwl-$(VERSION)
 	rm -rf dwl-$(VERSION)
diff --git a/config.def.h b/config.def.h
index 8a6eda0..48270f6 100644
--- a/config.def.h
+++ b/config.def.h
@@ -165,6 +165,22 @@ static const Key keys[] = {
 	CHVT(7), CHVT(8), CHVT(9), CHVT(10), CHVT(11), CHVT(12),
 };
 
+static const GamepadButton gamepadbuttons[] = {
+    { BTN_DPAD_DOWN, focusstack, {.i = +1} },
+    { BTN_DPAD_UP, focusstack, {.i = -1} },
+    { BTN_DPAD_LEFT, setmfact, {.f = -0.05f} },
+    { BTN_DPAD_RIGHT, setmfact, {.f = +0.05f} },
+    { BTN_SOUTH, zoom, {0} },
+    { BTN_EAST, setlayout, {.v = &layouts[0]} },
+    { BTN_NORTH, setlayout, {.v = &layouts[1]} },
+    { BTN_WEST, setlayout, {.v = &layouts[2]} },
+    { ABS_Z, focusmon, {.i = WLR_DIRECTION_LEFT} },
+    { ABS_RZ, focusmon, {.i = WLR_DIRECTION_RIGHT} },
+    { BTN_START, spawn, SHCMD("wmenu-run") },
+    { BTN_SELECT, winview, {0} },
+    { BTN_MODE, spawn, { "steam", NULL }},
+};
+
 static const Button buttons[] = {
 	{ MODKEY, BTN_LEFT,   moveresize,     {.ui = CurMove} },
 	{ MODKEY, BTN_MIDDLE, togglefloating, {0} },
diff --git a/dwl.c b/dwl.c
index 101a45f..96e1c01 100644
--- a/dwl.c
+++ b/dwl.c
@@ -63,6 +63,7 @@
 #include <wlr/util/log.h>
 #include <wlr/util/region.h>
 #include <xkbcommon/xkbcommon.h>
+#include "gamepad.h"
 #ifdef XWAYLAND
 #include <wlr/xwayland.h>
 #include <xcb/xcb.h>
@@ -149,6 +150,12 @@ typedef struct {
 	const Arg arg;
 } Key;
 
+typedef struct {
+    unsigned int button;
+    void (*func)(const Arg *);
+    const Arg arg;
+} GamepadButton;
+
 typedef struct {
 	struct wlr_keyboard_group *wlr_group;
 
@@ -289,6 +296,7 @@ static void focusstack(const Arg *arg);
 static Client *focustop(Monitor *m);
 static void fullscreennotify(struct wl_listener *listener, void *data);
 static void gpureset(struct wl_listener *listener, void *data);
+static void gamepadbutton(unsigned int button, int state);
 static void handlesig(int signo);
 static void incnmaster(const Arg *arg);
 static void inputdevice(struct wl_listener *listener, void *data);
@@ -398,6 +406,7 @@ static struct wlr_session_lock_v1 *cur_lock;
 
 static struct wlr_seat *seat;
 static KeyboardGroup *kb_group;
+static struct gamepad *gamepad;
 static unsigned int cursor_mode;
 static Client *grabc;
 static int grabcx, grabcy; /* client-relative */
@@ -713,6 +722,7 @@ cleanup(void)
 	wlr_xcursor_manager_destroy(cursor_mgr);
 
 	destroykeyboardgroup(&kb_group->destroy, NULL);
+    gamepad_destroy(gamepad);
 
 	/* If it's not destroyed manually, it will cause a use-after-free of wlr_seat.
 	 * Destroy it until it's fixed on the wlroots side */
@@ -1558,6 +1568,21 @@ gpureset(struct wl_listener *listener, void *data)
 	wlr_renderer_destroy(old_drw);
 }
 
+void
+gamepadbutton(unsigned int button, int state)
+{
+    const GamepadButton *b;
+    if (!state || locked)
+            return;
+    wlr_idle_notifier_v1_notify_activity(idle_notifier, seat);
+    for (b = gamepadbuttons; b < END(gamepadbuttons); b++) {
+        if (button == b->button && b->func) {
+            b->func(&b->arg);
+            break;
+        }
+    }
+}
+
 void
 handlesig(int signo)
 {
@@ -2643,6 +2668,7 @@ setup(void)
 
 	kb_group = createkeyboardgroup();
 	wl_list_init(&kb_group->destroy.link);
+    gamepad = gamepad_create(event_loop, session, gamepadbutton);
 
 	output_mgr = wlr_output_manager_v1_create(dpy);
 	wl_signal_add(&output_mgr->events.apply, &output_mgr_apply);
diff --git a/gamepad.c b/gamepad.c
new file mode 100644
index 0000000..6bad2f6
--- /dev/null
+++ b/gamepad.c
@@ -0,0 +1,255 @@
+#include <fcntl.h>
+#include <libevdev/libevdev.h>
+#include <libudev.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <wayland-server-core.h>
+#include <wlr/backend/session.h>
+
+#include "gamepad.h"
+
+struct pad {
+	struct wl_list link;
+	char *path;
+	int fd;
+	struct libevdev *dev;
+	struct wl_event_source *src;
+	unsigned char key[KEY_CNT];
+	unsigned char abs[ABS_CNT];
+	int enabled;
+	GamepadHandler fn;
+};
+
+struct gamepad {
+	struct udev *udev;
+	struct udev_monitor *mon;
+	struct wl_event_source *msrc;
+	struct wl_event_loop *loop;
+	struct wl_list pads;
+	GamepadHandler fn;
+};
+
+static int
+ispad(struct udev_device *d)
+{
+	const char *p;
+
+	p = udev_device_get_property_value(d, "ID_INPUT_JOYSTICK");
+	return !strcmp(udev_device_get_subsystem(d), "input")
+		&& !strncmp(udev_device_get_sysname(d), "event", 5)
+		&& p && !strcmp(p, "1");
+}
+
+static void
+padstop(struct pad *p)
+{
+	if (p->src)
+		wl_event_source_remove(p->src);
+	if (p->dev)
+		libevdev_free(p->dev);
+	if (p->fd >= 0)
+		close(p->fd);
+	p->src = NULL;
+	p->dev = NULL;
+	p->fd = -1;
+}
+
+static void
+padclose(struct pad *p)
+{
+	padstop(p);
+	wl_list_remove(&p->link);
+	free(p->path);
+	free(p);
+}
+
+static int
+padin(int fd, uint32_t mask, void *data)
+{
+	struct pad *p = data;
+	struct input_event e;
+	int r, v;
+
+	if (mask & (WL_EVENT_HANGUP | WL_EVENT_ERROR)) {
+		padclose(p);
+		return 0;
+	}
+	while ((r = libevdev_next_event(p->dev, LIBEVDEV_READ_FLAG_NORMAL, &e)) == 0
+			|| r == LIBEVDEV_READ_STATUS_SYNC) {
+		if (e.type == EV_KEY) {
+			v = !!e.value;
+			if (p->key[e.code] != v) {
+				p->key[e.code] = v;
+				if (p->enabled)
+					p->fn(e.code, v);
+				if ((e.code == BTN_TL || e.code == BTN_TR)
+						&& p->key[BTN_TL] && p->key[BTN_TR] && v)
+					p->enabled ^= 1;
+			}
+		} else if (e.type == EV_ABS && (e.code == ABS_Z || e.code == ABS_RZ
+				|| e.code == ABS_GAS || e.code == ABS_BRAKE)) {
+			const struct input_absinfo *a = libevdev_get_abs_info(p->dev, e.code);
+
+			v = e.value > (a->minimum + a->maximum) / 2;
+			if (p->abs[e.code] != v) {
+				p->abs[e.code] = v;
+				if (p->enabled)
+					p->fn(e.code, v);
+			}
+		} else if (e.type == EV_ABS && e.code == ABS_HAT0X) {
+			v = e.value + 1;
+			if (p->abs[e.code] != v) {
+				if (p->enabled) {
+					p->fn(BTN_DPAD_LEFT, 0);
+					p->fn(BTN_DPAD_RIGHT, 0);
+				}
+				p->abs[e.code] = v;
+				if (p->enabled) {
+					p->fn(BTN_DPAD_LEFT, e.value < 0);
+					p->fn(BTN_DPAD_RIGHT, e.value > 0);
+				}
+			}
+		} else if (e.type == EV_ABS && e.code == ABS_HAT0Y) {
+			v = e.value + 1;
+			if (p->abs[e.code] != v) {
+				if (p->enabled) {
+					p->fn(BTN_DPAD_UP, 0);
+					p->fn(BTN_DPAD_DOWN, 0);
+				}
+				p->abs[e.code] = v;
+				if (p->enabled) {
+					p->fn(BTN_DPAD_UP, e.value < 0);
+					p->fn(BTN_DPAD_DOWN, e.value > 0);
+				}
+			}
+		}
+	}
+	return 0;
+}
+
+static void
+padstart(struct pad *p, struct wl_event_loop *loop)
+{
+	if (p->fd >= 0 || (p->fd = open(p->path, O_RDONLY | O_NONBLOCK | O_CLOEXEC)) < 0)
+		return;
+	if (libevdev_new_from_fd(p->fd, &p->dev)) {
+		close(p->fd);
+		p->fd = -1;
+		return;
+	}
+	if (!(p->src = wl_event_loop_add_fd(loop, p->fd, WL_EVENT_READABLE, padin, p)))
+		padstop(p);
+}
+
+static void
+padadd(struct gamepad *g, struct udev_device *d)
+{
+	struct pad *p;
+	struct pad *q;
+	const char *path;
+
+	if (!ispad(d) || !(path = udev_device_get_devnode(d)))
+		return;
+	wl_list_for_each(q, &g->pads, link) {
+		if (!strcmp(q->path, path))
+			return;
+	}
+	if (!(p = calloc(1, sizeof(*p))))
+		return;
+	if (!(p->path = strdup(path))) {
+		free(p);
+		return;
+	}
+	p->fd = -1;
+	p->enabled = 1;
+	p->fn = g->fn;
+	wl_list_insert(&g->pads, &p->link);
+	padstart(p, g->loop);
+}
+
+static void
+padremove(struct gamepad *g, const char *path)
+{
+	struct pad *p, *t;
+
+	wl_list_for_each_safe(p, t, &g->pads, link) {
+		if (!strcmp(p->path, path)) {
+			padclose(p);
+			break;
+		}
+	}
+}
+
+static int
+monin(int fd, uint32_t mask, void *data)
+{
+	struct gamepad *g = data;
+	struct udev_device *d;
+	const char *a;
+	const char *path;
+
+	if (!(d = udev_monitor_receive_device(g->mon)))
+		return 0;
+	a = udev_device_get_action(d);
+	path = udev_device_get_devnode(d);
+	if (a && !strcmp(a, "add"))
+		padadd(g, d);
+	else if (a && !strcmp(a, "remove") && path)
+		padremove(g, path);
+	udev_device_unref(d);
+	return 0;
+}
+
+struct gamepad *
+gamepad_create(struct wl_event_loop *loop, struct wlr_session *s, GamepadHandler fn)
+{
+	struct gamepad *g;
+	struct udev_enumerate *e;
+	struct udev_list_entry *l;
+	struct udev_device *d;
+
+	if (!s || !(g = calloc(1, sizeof(*g))) || !(g->udev = udev_new()))
+		return NULL;
+	g->loop = loop;
+	g->fn = fn;
+	wl_list_init(&g->pads);
+	if ((e = udev_enumerate_new(g->udev))) {
+		udev_enumerate_add_match_subsystem(e, "input");
+		udev_enumerate_scan_devices(e);
+		udev_list_entry_foreach(l, udev_enumerate_get_list_entry(e)) {
+			d = udev_device_new_from_syspath(g->udev, udev_list_entry_get_name(l));
+			if (d) {
+				padadd(g, d);
+				udev_device_unref(d);
+			}
+		}
+		udev_enumerate_unref(e);
+	}
+	if (!(g->mon = udev_monitor_new_from_netlink(g->udev, "udev"))
+		|| udev_monitor_filter_add_match_subsystem_devtype(g->mon, "input", NULL)
+		|| udev_monitor_enable_receiving(g->mon)
+		|| !(g->msrc = wl_event_loop_add_fd(loop, udev_monitor_get_fd(g->mon), WL_EVENT_READABLE, monin, g))) {
+		gamepad_destroy(g);
+		return NULL;
+	}
+	return g;
+}
+
+void
+gamepad_destroy(struct gamepad *g)
+{
+	struct pad *p, *t;
+
+	if (!g)
+		return;
+	wl_list_for_each_safe(p, t, &g->pads, link)
+		padclose(p);
+	if (g->msrc)
+		wl_event_source_remove(g->msrc);
+	if (g->mon)
+		udev_monitor_unref(g->mon);
+	if (g->udev)
+		udev_unref(g->udev);
+	free(g);
+}
diff --git a/gamepad.h b/gamepad.h
new file mode 100644
index 0000000..5d45d28
--- /dev/null
+++ b/gamepad.h
@@ -0,0 +1,15 @@
+#ifndef GAMEPAD_H
+#define GAMEPAD_H
+
+#include <linux/input.h>
+
+struct gamepad;
+struct wl_event_loop;
+struct wlr_session;
+
+typedef void (*GamepadHandler)(unsigned int, int);
+
+struct gamepad *gamepad_create(struct wl_event_loop *, struct wlr_session *, GamepadHandler);
+void gamepad_destroy(struct gamepad *);
+
+#endif