first sketch

12 files changed, 1493 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d305e16
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+dmenu-wl
+*.o
+*-protocol.*
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..0d5a311
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,43 @@
+WLR_LAYER_SHELL=protocol/wlr-layer-shell-unstable.xml
+XDG_SHELL=/usr/share/wayland-protocols/stable/xdg-shell/xdg-shell.xml
+DWL_IPC=protocol/dwl-bar-ipc-unstable-v1.xml
+PROTOCOLS=wlr-layer-shell-protocol.c xdg-shell-protocol.c dwl-bar-ipc-protocol.c
+SRC=dmenu-wl.c drw.c util.c wayland.c
+OBJ=${SRC:.c=.o} ${PROTOCOLS:.c=.o}
+LDFLAGS=-lfreetype -lwayland-client -lrt -lxkbcommon -lm -lgrapheme
+CFLAGS=-I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/sysprof-4 -pthread
+CC=gcc
+
+default_target: options dmenu-wl
+
+options:
+	@echo ${OBJ}
+
+wlr-layer-shell-protocol.h:
+	wayland-scanner client-header < ${WLR_LAYER_SHELL} > $@
+
+wlr-layer-shell-protocol.c: wlr-layer-shell-protocol.h
+	wayland-scanner private-code < ${WLR_LAYER_SHELL} > $@
+
+xdg-shell-protocol.h:
+	wayland-scanner client-header < ${XDG_SHELL} > $@
+
+xdg-shell-protocol.c: xdg-shell-protocol.h
+	wayland-scanner private-code < ${XDG_SHELL} > $@
+
+dwl-bar-ipc-protocol.h:
+	wayland-scanner client-header < ${DWL_IPC} > $@
+
+dwl-bar-ipc-protocol.c: dwl-bar-ipc-protocol.h
+	wayland-scanner private-code < ${DWL_IPC} > $@
+
+.c.o:
+	${CC} -c $< ${CFLAGS}
+
+${OBJ}: ${PROTOCOLS} config.h
+
+dmenu-wl: ${OBJ}
+	${CC} -o $@ ${OBJ} ${LDFLAGS}
+
+clean:
+	rm ${OBJ} dmenu-wl ${PROTOCOLS} ${PROTOCOLS:.c=.h}
diff --git a/config.h b/config.h
new file mode 100644
index 0000000..dc0d258
--- /dev/null
+++ b/config.h
@@ -0,0 +1,16 @@
+#include <stdint.h>
+
+/* colors in argb */
+static uint32_t background = 0xff282828;
+static uint32_t foreground = 0xffebdbb2;
+static uint32_t highlight  = 0xffb16286;
+
+static unsigned lines = 20;
+static unsigned padding = 10;
+static unsigned borderwidth = 2;
+static unsigned fontsize = 11;
+static char fontpath[] = "/usr/share/fonts/TTF/Sauce Code Pro Nerd Font Complete Mono.ttf";
+
+static unsigned cursor_width = 1;
+static unsigned cursor_vertical_offset = 2;
+static unsigned cursor_horizontal_offset = 1;
diff --git a/dmenu-wl.c b/dmenu-wl.c
new file mode 100644
index 0000000..3cc5a05
--- /dev/null
+++ b/dmenu-wl.c
@@ -0,0 +1,475 @@
+#define _POSIX_C_SOURCE 200112L
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <wayland-client.h>
+#include <xkbcommon/xkbcommon.h>
+#include <malloc.h>
+#include <unistd.h>
+
+#include "xdg-shell-protocol.h"
+#include "dwl-bar-ipc-protocol.h"
+#include "wlr-layer-shell-protocol.h"
+
+#include "drw.h"
+
+/* macro definitions */
+#define MAX_LINE_LENGTH 1024
+#define match_then_bind(obj, inter, ver) \
+	if (strcmp(interface, inter.name) == 0) { \
+		obj = wl_registry_bind(wl_registry, name, &inter, ver);
+
+#define end_match }
+#define or_match } else
+
+/* struct definitions */
+typedef struct {
+	struct wl_display *display;
+	struct wl_registry *registry;
+	struct wl_compositor *compositor;
+	struct wl_shm *shm;
+	struct zdwl_manager_v1 *dwl_manager;
+	struct zwlr_layer_shell_v1 *layer;
+	struct wl_seat *seat;
+	struct wl_keyboard *keyboard;
+	struct xkb_context *xkb_context;
+	struct xkb_state *xkb_state;
+	struct xkb_keymap *xkb_keymap;
+	struct {
+		uint32_t control;
+		uint32_t alt;
+		uint32_t shift;
+	} mod;
+} Client;
+
+typedef struct Monitor Monitor;
+struct Monitor {
+	uint32_t width;
+	Canvas *canvas;
+	Font *font;
+	struct zdwl_output_v1 *dwl_output;
+	struct wl_output *output;
+	struct wl_surface *surface;
+	struct zwlr_layer_surface_v1 *wlr_surface;
+	Monitor *next;
+};
+
+typedef struct Option Option;
+struct Option {
+	char *name;
+	Option *next;
+	Option *previous;
+	Option *next_match;
+	Option *previous_match;
+};
+
+typedef struct Options Options;
+struct Options {
+	Option *first;
+	Option *last;
+	Option *first_match;
+	Option *last_match;
+	Option *selection;
+} options = { 0 };
+
+/* function definition */
+static void generate_matches();
+static int match_option(char *name);
+static void draw_dmenu(Monitor *monitor);
+static void setup();
+static void readstdin();
+static Monitor *add_monitor();
+static void registry_global(void *data, struct wl_registry *wl_registry, uint32_t name, const char *interface, uint32_t version);
+static void seat_capabilities(void *data, struct wl_seat *seat, uint32_t capabilities);
+static void dwl_output_active(void *data, struct zdwl_output_v1 *output, uint32_t active);
+static void wlr_layer_surface_configure(void *data, struct zwlr_layer_surface_v1 *surface, uint32_t serial, uint32_t w, uint32_t h);
+static void keyboard_keymap(void *data, struct wl_keyboard *keyboard, uint32_t format, int32_t fd, uint32_t size);
+static void keyboard_key(void *data, struct wl_keyboard *keyboard, uint32_t serial, uint32_t time, uint32_t key, uint32_t state);
+static void keyboard_modifiers(void *data, struct wl_keyboard *keyboard, uint32_t serial, uint32_t depressed, uint32_t latched, uint32_t locked, uint32_t group);
+static void keyboard_repeat_info(void *data, struct wl_keyboard *keyboard, int32_t rate, int32_t delay);
+static void dummy() {}
+
+/* global variables */
+static const struct wl_registry_listener registry_listnener = {
+	.global = registry_global,
+	.global_remove = dummy
+};
+
+static const struct zdwl_output_v1_listener dwl_output_listener = {
+	.active = dwl_output_active,
+	.appid = dummy,
+	.frame = dummy,
+	.layout = dummy,
+	.tag = dummy,
+	.title = dummy,
+	.toggle_visibility = dummy,
+};
+
+static const struct zwlr_layer_surface_v1_listener wlr_layer_surface_listener = {
+	.closed = dummy,
+	.configure = wlr_layer_surface_configure,
+};
+
+static const struct wl_seat_listener seat_listener = {
+	.capabilities = seat_capabilities,
+	.name = dummy,
+};
+
+static const struct wl_keyboard_listener keyboard_listener = {
+	.keymap = keyboard_keymap,
+	.enter = dummy,
+	.key = keyboard_key,
+	.leave = dummy,
+	.modifiers = keyboard_modifiers,
+	.repeat_info = keyboard_repeat_info,
+};
+
+Client client = { 0 };
+Monitor *monitors = 0;
+Monitor *active_monitor = 0;
+uint32_t height = 50;
+uint32_t numitems = 0;
+char input_field[MAX_LINE_LENGTH] = { 0 };
+int running = 1;
+
+#include "config.h"
+
+/* function implementations */
+int
+option_match(char *name)
+{
+	int i = 0;
+
+	for (; *name; ++name) {
+		if (input_field[i] == 0)
+			return 1;
+
+		if (*name != input_field[i]) {
+			i = 0;
+		} else {
+			++i;
+		}
+	}
+
+	if (input_field[i] == 0)
+		return 1;
+
+	return 0;
+}
+
+
+void
+generate_matches()
+{
+	Option *match = options.first;
+	options.first_match = 0;
+	options.last_match = 0;
+
+	for (; match; match = match->next) {
+		if (option_match(match->name)) {
+			if (options.first_match == 0) {
+				options.first_match = match;
+				options.last_match = match;
+			} else {
+				options.last_match->next_match = match;
+				match->previous_match = options.last;
+				options.last_match = match;
+			}
+		}
+	}
+
+	options.selection = options.first_match;
+	if (options.last_match)
+		options.last_match->next_match = 0;
+}
+
+
+void
+draw_dmenu(Monitor *monitor)
+{
+	Option *match = options.first_match;
+	unsigned x = 0;
+	unsigned y = 0;
+
+	draw_rect(monitor->canvas, 0, 0, monitor->width, height, highlight);
+	draw_rect(monitor->canvas, borderwidth, borderwidth,
+	          monitor->width - 2 * borderwidth, height - 2 * borderwidth, background);
+	draw_rect(monitor->canvas, 0, fontsize + borderwidth + 2 * padding,
+	          monitor->width, borderwidth, highlight);
+	x = draw_font(monitor->canvas, monitor->font, input_field,
+	              padding + borderwidth, borderwidth + fontsize + padding, foreground);
+	draw_rect(monitor->canvas, x + cursor_horizontal_offset,
+	          borderwidth + padding - cursor_vertical_offset, cursor_width,
+	          fontsize + 2 * cursor_vertical_offset, foreground);
+
+	y = 2 * borderwidth + fontsize + 2 * padding;
+
+	for (; match; match = match->next_match) {
+		if (match == options.selection)
+			draw_rect(monitor->canvas, 0, y, monitor->width, fontsize + 2 * padding, highlight);
+		y += fontsize + padding;
+		draw_font(monitor->canvas, monitor->font, match->name, padding, y, foreground);
+		y += padding;
+	}
+
+	wl_surface_attach(monitor->surface, (struct wl_buffer*)monitor->canvas->buffer, 0, 0);
+	wl_surface_damage_buffer(monitor->surface, 0, 0, monitor->width, height);
+	wl_surface_commit(monitor->surface);
+}
+
+
+Monitor *
+add_monitor()
+{
+	Monitor *last = monitors;
+	Monitor *mon = malloc(sizeof(Monitor));
+	memset(mon, 0, sizeof(Monitor));
+
+	if (monitors == 0) {
+		monitors = mon;
+	} else {
+		for (; last->next; last = last->next);
+		last->next = mon;
+	}
+
+	return mon;
+}
+
+void
+registry_global(void *data, struct wl_registry *wl_registry, uint32_t name, const char *interface, uint32_t version)
+{
+	struct wl_output *output;
+	Monitor *monitor;
+
+	match_then_bind(client.shm, wl_shm_interface, 1)
+	or_match match_then_bind(client.compositor, wl_compositor_interface, 4)
+	or_match match_then_bind(client.layer, zwlr_layer_shell_v1_interface, 1)
+	or_match match_then_bind(client.dwl_manager, zdwl_manager_v1_interface, 1)
+	or_match match_then_bind(client.seat, wl_seat_interface, 7)
+		wl_seat_add_listener(client.seat, &seat_listener, &client);
+	or_match match_then_bind(output, wl_output_interface, 1)
+		monitor = add_monitor();
+		monitor->output = output;
+	end_match
+}
+
+
+void
+seat_capabilities(void *data, struct wl_seat *seat, uint32_t capabilities)
+{
+	int has_keyboard = capabilities & WL_SEAT_CAPABILITY_KEYBOARD;
+	
+	if (has_keyboard && client.keyboard == NULL) {
+		client.keyboard = wl_seat_get_keyboard(client.seat);
+		wl_keyboard_add_listener(client.keyboard, &keyboard_listener, &client);
+	} else {
+		wl_keyboard_release(client.keyboard);
+		client.keyboard = NULL;
+	}
+}
+
+
+void
+dwl_output_active(void *data, struct zdwl_output_v1 *output, uint32_t active)
+{
+	Monitor *monitor = data;
+
+	if (active && active_monitor == 0) {
+		active_monitor = data;
+	}
+}
+
+
+void
+wlr_layer_surface_configure(void *data, struct zwlr_layer_surface_v1 *surface, uint32_t serial, uint32_t w, uint32_t h)
+{
+	Monitor *mon = data;
+	mon->width = w;
+
+	zwlr_layer_surface_v1_ack_configure(surface, serial);
+	
+	if (mon->canvas == 0)
+		mon->canvas = create_drw(client.shm, mon->width, height);
+	draw_dmenu(mon);
+}
+
+
+void
+keyboard_keymap(void *data, struct wl_keyboard *keyboard, uint32_t format, int32_t fd, uint32_t size)
+{
+	char *key_shm;
+	struct xkb_keymap *keymap;
+	struct xkb_state *state;
+
+	if (format != WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1)
+		return;
+
+	key_shm = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
+
+	if (key_shm == MAP_FAILED)
+		return;
+
+	keymap = xkb_keymap_new_from_string(
+		client.xkb_context, key_shm,
+		XKB_KEYMAP_FORMAT_TEXT_V1, XKB_KEYMAP_COMPILE_NO_FLAGS
+	);
+
+	munmap(key_shm, size);
+	close(fd);
+
+	state = xkb_state_new(keymap);
+	xkb_keymap_unref(client.xkb_keymap);
+	xkb_state_unref(client.xkb_state);
+
+	client.xkb_state = state;
+	client.xkb_keymap = keymap;
+}
+
+
+void
+keyboard_key(void *data, struct wl_keyboard *keyboard, uint32_t serial, uint32_t time, uint32_t key, uint32_t state)
+{
+	int genmatch = 0;
+	char buf[128];
+	uint32_t keycode = key + 8;
+	xkb_keysym_t sym = xkb_state_key_get_one_sym(client.xkb_state, keycode);
+	xkb_keysym_get_name(sym, buf, sizeof(buf));
+	xkb_state_key_get_utf8(client.xkb_state, keycode, buf, sizeof(buf));
+
+	if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
+		switch (sym) {
+			case XKB_KEY_KP_Enter: /* fallthrough */
+			case XKB_KEY_Return:
+				fputs(options.selection ? options.selection->name: input_field, stdout);
+				running = 0;
+				break;
+			case XKB_KEY_Escape:
+				running = 0;
+				break;
+			case XKB_KEY_BackSpace:
+				if (strlen(input_field))
+					input_field[strlen(input_field) - 1] = 0;
+				genmatch = 1;
+				break;
+			default:
+				strncpy(input_field + strlen(input_field), buf, MAX_LINE_LENGTH - strlen(input_field));
+				genmatch = 1;
+				break;
+		}
+
+		if (running) {
+			generate_matches();
+			draw_dmenu(active_monitor);
+		}
+	}
+}
+
+
+void
+keyboard_modifiers(void *data, struct wl_keyboard *keyboard, uint32_t serial, uint32_t depressed, uint32_t latched, uint32_t locked, uint32_t group)
+{
+	xkb_state_update_mask(client.xkb_state, depressed, latched, locked, 0, 0, group);
+	client.mod.alt = xkb_state_mod_name_is_active(client.xkb_state, XKB_MOD_NAME_ALT, XKB_STATE_MODS_DEPRESSED | XKB_STATE_MODS_LATCHED);
+	client.mod.control = xkb_state_mod_name_is_active(client.xkb_state, XKB_MOD_NAME_CTRL, XKB_STATE_MODS_DEPRESSED | XKB_STATE_MODS_LATCHED);
+	client.mod.shift = xkb_state_mod_name_is_active(client.xkb_state, XKB_MOD_NAME_SHIFT, XKB_STATE_MODS_DEPRESSED | XKB_STATE_MODS_LATCHED);
+}
+
+
+void
+keyboard_repeat_info(void *data, struct wl_keyboard *keyboard, int32_t rate, int32_t delay)
+{
+	/* TODO */
+}
+
+
+void
+readstdin()
+{
+	unsigned s;
+	char *buf = malloc(MAX_LINE_LENGTH);
+	Option *option;
+
+	while (fgets(buf, MAX_LINE_LENGTH, stdin) != 0) {
+		++numitems;
+		option = malloc(sizeof(Option));
+		option->name = buf;
+		s = strlen(option->name);
+		if (option->name[s - 1] == '\n')
+			option->name[s - 1] = 0;
+		option->next = 0;
+		option->next_match = 0;
+		option->previous_match = 0;
+
+		if (options.first == 0) {
+			options.first = option;
+			options.last = option;
+			option->previous = 0;
+		} else {
+			options.last->next = option;
+			option->previous = options.last;
+			options.last = option;
+		}
+
+		buf = malloc(MAX_LINE_LENGTH);
+	}
+
+	free(buf);
+}
+
+
+void
+setup()
+{
+	Monitor *mon;
+	char namespace[] = "dmenu-wl";
+	uint32_t layer = ZWLR_LAYER_SHELL_V1_LAYER_TOP;
+	uint32_t anchor = ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP | ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT | ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT;
+
+	if (numitems < lines)
+		lines = numitems;
+
+	generate_matches();
+	height = (lines + 1) * (fontsize + padding * 2) + 3 * borderwidth;
+
+	client.xkb_context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
+	client.display = wl_display_connect(0);
+	client.registry = wl_display_get_registry(client.display);
+	wl_registry_add_listener(client.registry, &registry_listnener, &client);
+	wl_display_roundtrip(client.display);
+
+
+	for (mon = monitors; mon; mon = mon->next) {
+		mon->dwl_output = zdwl_manager_v1_get_output(client.dwl_manager, mon->output);
+		zdwl_output_v1_add_listener(mon->dwl_output, &dwl_output_listener, mon);
+	}
+	wl_display_roundtrip(client.display);
+
+	active_monitor->font = create_font(fontpath, fontsize * 1.5);
+
+	active_monitor->surface = wl_compositor_create_surface(client.compositor);
+	active_monitor->wlr_surface = zwlr_layer_shell_v1_get_layer_surface(client.layer, active_monitor->surface, active_monitor->output, layer, namespace);
+
+	zwlr_layer_surface_v1_set_exclusive_zone(active_monitor->wlr_surface, -1);
+	zwlr_layer_surface_v1_set_keyboard_interactivity(active_monitor->wlr_surface, 1);
+
+	zwlr_layer_surface_v1_add_listener(active_monitor->wlr_surface, &wlr_layer_surface_listener, active_monitor);
+
+	zwlr_layer_surface_v1_set_size(active_monitor->wlr_surface, 0, height);
+	zwlr_layer_surface_v1_set_anchor(active_monitor->wlr_surface, anchor);
+
+	wl_surface_commit(active_monitor->surface);
+	wl_display_roundtrip(client.display);
+}
+
+
+int
+main(int argc, char *argv[])
+{
+	readstdin();
+	setup();
+
+	while (running && wl_display_dispatch(client.display)) {
+	}
+
+	wl_display_dispatch(client.display);
+}
diff --git a/drw.c b/drw.c
new file mode 100644
index 0000000..f65f330
--- /dev/null
+++ b/drw.c
@@ -0,0 +1,271 @@
+#include <sys/mman.h>
+#include <unistd.h>
+#include <math.h>
+#include <grapheme.h>
+
+#include "drw.h"
+#include "util.h"
+
+/* static function declarations */
+static Color to_color(uint32_t color);
+static uint32_t to_uint32_t(Color color);
+static void draw_bitmap(Canvas *canvas, FT_Bitmap *bitmap, unsigned x, unsigned y, uint32_t color);
+
+
+Color
+to_color(uint32_t color)
+{
+	return *(Color*)(&color);
+}
+
+
+uint32_t
+to_uint32_t(Color color)
+{
+	return *(uint32_t*)(&color);
+}
+
+
+Canvas*
+create_drw(struct wl_shm *shm, unsigned width, unsigned height)
+{
+	struct wl_shm_pool *pool;
+	Canvas *canvas;
+	int stride;
+	int fd;
+
+	canvas = malloc(sizeof(Canvas));
+	canvas->width = width;
+	canvas->height = height;
+
+	stride = width * sizeof(uint32_t);
+	canvas->size = stride * height;
+
+	fd = allocate_shm_file(canvas->size);
+	if (fd == -1) {
+		return NULL;
+	}
+
+	canvas->data = mmap(
+			NULL,
+			canvas->size,
+			PROT_READ | PROT_WRITE,
+			MAP_SHARED,
+			fd,
+			0
+		);
+
+	if (canvas->data == MAP_FAILED) {
+		close(fd);
+		return NULL;
+	}
+
+	pool = wl_shm_create_pool(
+			shm,
+			fd,
+			canvas->size
+	);
+
+	canvas->buffer = wl_shm_pool_create_buffer(
+			pool,
+			0,
+			width,
+			height,
+			stride,
+			WL_SHM_FORMAT_XRGB8888
+		);
+
+	wl_shm_pool_destroy(pool);
+	close(fd);
+
+	return canvas;
+}
+
+
+void
+free_drw(Canvas *canvas)
+{
+	munmap(canvas->data, canvas->size);
+	free(canvas);
+}
+
+
+void
+draw_point(Canvas *canvas, unsigned x, unsigned y, uint32_t color)
+{
+	if (!(x < canvas->width && y < canvas->height))
+		return;
+
+	canvas->data[x + canvas->width * y] = color;
+}
+
+
+void
+draw_rect(Canvas *canvas, unsigned x, unsigned y, unsigned width, unsigned height, uint32_t color) {
+	int py;
+	int px;
+
+	for (py = y; py < y + height; ++py) {
+		for (px = x; px < x + width; ++px) {
+			draw_point(canvas, px, py, color);
+		}
+	}
+}
+
+Font *
+create_font(const char *fontpath, unsigned size)
+{
+	FT_Error error;
+	Font * font;
+
+	font = malloc(sizeof(Font));
+
+	error = FT_Init_FreeType(&font->library);
+
+	if (error)
+		die("cannot init library");
+
+	error = FT_New_Face(font->library, fontpath, 0, &font->face);
+	if (error)
+		die("cannot open face");
+
+	error = FT_Set_Pixel_Sizes(font->face, 0, size);
+	if (error)
+		die("cannot set char size");
+
+	error = FT_Select_Charmap(font->face, ft_encoding_unicode);
+	if (error)
+		die("cannot set unicode");
+
+	return font;
+}
+
+void
+free_font(Font *font)
+{
+	FT_Done_Face(font->face);
+	FT_Done_FreeType(font->library);
+	free(font);
+}
+
+
+void
+draw_bitmap(Canvas *canvas, FT_Bitmap *bitmap, unsigned x, unsigned y, uint32_t color)
+{
+	FT_Int  i, j, p, q;
+	double strength;
+	uint32_t pixel;
+
+	Color fg = to_color(color);
+	Color bg;
+	Color c;
+
+	c.a = fg.a;
+
+	i = x;
+	p = 0;
+
+	while (p < bitmap->width) {
+		j = y;
+		q = 0;
+
+		while (q < bitmap->rows) {
+			if (i < 0 || j < 0 || i >= canvas->width || j >= canvas->height) {
+				j++;
+				q++;
+				continue;
+			}
+
+			bg = to_color(canvas->data[i + j * canvas->width]);
+			strength = bitmap->buffer[p + q * bitmap->width];
+			strength /= 255;
+
+			c.r = (strength * fg.r) + ((1 - strength) * bg.r);
+			c.g = (strength * fg.g) + ((1 - strength) * bg.g);
+			c.b = (strength * fg.b) + ((1 - strength) * bg.b);
+
+			pixel = to_uint32_t(c);
+			draw_point(canvas, i, j, pixel);
+
+			j++;
+			q++;
+		}
+
+		i++;
+		p++;
+	}
+}
+
+
+unsigned
+draw_font(Canvas *canvas, Font *font, const char *text, unsigned x, unsigned y, uint32_t color)
+{
+	FT_GlyphSlot slot;
+	FT_Error error;
+	FT_UInt glyph_index;
+	FT_UInt previous = 0;
+	uint_least32_t charcode;
+	FT_Bool has_kerning = FT_HAS_KERNING(font->face);
+	FT_Vector delta;
+
+	slot = font->face->glyph;
+
+	for (; *text;) {
+		text += grapheme_decode_utf8(text, sizeof(uint_least32_t), &charcode);
+
+		glyph_index = FT_Get_Char_Index(font->face, charcode);
+
+		if (has_kerning && previous && glyph_index) {
+			FT_Get_Kerning(font->face, previous, glyph_index, FT_KERNING_DEFAULT, &delta);
+			x += delta.x >> 6;
+		}
+
+		error = FT_Load_Glyph(font->face, glyph_index, FT_LOAD_RENDER);
+		if (error) {
+			fprintf(stderr, "warning: char not loaded, skipping...\n");
+			continue;
+		}
+
+		draw_bitmap(canvas, &slot->bitmap, x + slot->bitmap_left, y - slot->bitmap_top, color);
+
+		x += slot->advance.x >> 6;
+	}
+
+	return x;
+}
+
+unsigned
+font_width(Font *font, const char *text)
+{
+	FT_GlyphSlot slot;
+	FT_Error error;
+	FT_UInt glyph_index;
+	FT_UInt previous = 0;
+	uint_least32_t charcode;
+	FT_Bool has_kerning = FT_HAS_KERNING(font->face);
+	FT_Vector delta;
+	unsigned x = 0;
+
+	slot = font->face->glyph;
+
+	for (; *text;) {
+		text += grapheme_decode_utf8(text, sizeof(uint_least32_t), &charcode);
+
+		glyph_index = FT_Get_Char_Index(font->face, charcode);
+
+		if (has_kerning && previous && glyph_index) {
+			FT_Get_Kerning(font->face, previous, glyph_index, FT_KERNING_DEFAULT, &delta);
+			x += delta.x >> 6;
+		}
+
+		error = FT_Load_Glyph(font->face, glyph_index, FT_LOAD_RENDER);
+		if (error) {
+			fprintf(stderr, "warning: char not loaded, skipping...\n");
+			continue;
+		}
+
+		x += slot->advance.x >> 6;
+	}
+
+	return x;
+}
diff --git a/drw.h b/drw.h
new file mode 100644
index 0000000..84bec3b
--- /dev/null
+++ b/drw.h
@@ -0,0 +1,44 @@
+#ifndef DRW_H
+#define DRW_H
+
+#include <stdint.h>
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include FT_BITMAP_H
+
+#include "wayland.h"
+
+/* type definitions */
+typedef struct {
+	uint32_t *data;
+	unsigned width;
+	unsigned height;
+	unsigned size;
+	struct wl_buffer *buffer;
+} Canvas;
+
+typedef struct {
+	FT_Library library;
+	FT_Face face;
+} Font;
+
+typedef struct {
+	uint8_t r;
+	uint8_t g;
+	uint8_t b;
+	uint8_t a;
+} Color;
+
+/* exported functions */
+Canvas* create_drw(struct wl_shm *shm, unsigned width, unsigned height);
+void free_drw(Canvas *canvas);
+
+void draw_rect(Canvas *canvas, unsigned x, unsigned y, unsigned width, unsigned height, uint32_t color);
+void draw_point(Canvas *canvas, unsigned x, unsigned y, uint32_t color);
+
+Font* create_font(const char *fontpath, unsigned size);
+void free_font(Font *font);
+unsigned draw_font(Canvas *canvas, Font *font, const char *text, unsigned x, unsigned y, uint32_t color);
+unsigned font_width(Font *font, const char *text);
+
+#endif
diff --git a/protocol/dwl-bar-ipc-unstable-v1.xml b/protocol/dwl-bar-ipc-unstable-v1.xml
new file mode 100644
index 0000000..9c15246
--- /dev/null
+++ b/protocol/dwl-bar-ipc-unstable-v1.xml
@@ -0,0 +1,157 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+This is largely ripped from somebar's ipc patchset; just with some personal modifications.
+I would probably just submit raphi's patchset but I don't think that would be polite.
+-->
+<protocol name="dwl_bar_ipc_unstable_v1">
+  <description summary="inter-proccess-communication about dwl's state">
+      This protocol allows clients to get updates from dwl and vice versa.
+
+      Warning! The protocol described in this file is experimental and
+      backward incompatible changes may be made. Backward compatible
+      changes may be added together with the corresponding interface
+      version bump.
+      Backward incompatible changes are done by bumping the version
+      number in the protocol and interface names and resetting the
+      interface version. Once the protocol is to be declared stable,
+      the 'z' prefix and the version number in the protocol and
+      interface names are removed and the interface version number is
+      reset.
+  </description>
+
+  <interface name="zdwl_manager_v1" version="2">
+    <description summary="manage dwl state">
+      This interface is exposed as a global in wl_registry.
+
+      Clients can use this interface to get a dwl_output.
+      After binding the client will revieve dwl_manager.tag and dwl_manager.layout events.
+      The dwl_manager.tag and dwl_manager.layout events expose tags and layouts to the client.
+    </description>
+
+    <request name="release" type="destructor">
+      <description summary="release dwl_manager">
+        Indicates that the client will not the dwl_manager object anymore.
+        Objects created through this instance are not affected.
+      </description>
+    </request>
+
+    <request name="get_output">
+      <description summary="get a dwl_output for a wl_output">
+        Get a dwl_output for the specified wl_output.
+      </description>
+      <arg name="id" type="new_id" interface="zdwl_output_v1"/>
+      <arg name="output" type="object" interface="wl_output"/>
+    </request>
+
+    <event name="tag">
+      <description summary="Announces a tag">
+        This event is sent after binding.
+        A roundtrip after binding guarantees the client recieved all tags.
+      </description>
+      <arg name="name" type="string"/>
+    </event>
+
+    <event name="layout">
+      <description summary="Announces a layout">
+        This event is sent after binding.
+        A roundtrip after binding guarantees the client recieved all layouts.
+      </description>
+      <arg name="name" type="string"/>
+    </event>
+  </interface>
+
+  <interface name="zdwl_output_v1" version="2">
+    <description summary="control dwl output">
+      Observe and control a dwl output.
+
+      Events are double-buffered:
+      Clients should cache events and redraw when a dwl_output.done event is sent.
+
+      Request are not double-buffered:
+      The compositor will update immediately upon request.
+    </description>
+
+    <enum name="tag_state">
+      <entry name="none" value="0" summary="no state"/>
+      <entry name="active" value="1" summary="tag is active"/>
+      <entry name="urgent" value="2" summary="tag has at least one urgent client"/>
+    </enum>
+
+    <request name="release" type="destructor">
+      <description summary="release dwl_output">
+        Indicates to that the client no longer needs this dwl_output.
+      </description>
+    </request>
+
+    <event name="toggle_visibility">
+      <description summary="Toggle client visibilty">
+        Indicates the client should hide or show themselves.
+        If the client is visible then hide, if hidden then show.
+      </description>
+    </event>
+
+    <event name="active">
+      <description summary="Update the selected output.">
+        Indicates if the output is active. Zero is invalid, nonzero is valid.
+      </description>
+      <arg name="active" type="uint"/>
+    </event>
+
+    <event name="tag">
+      <description summary="Update the state of a tag.">
+        Indicates that a tag has been updated.
+      </description>
+      <arg name="tag" type="uint" summary="Index of the tag"/>
+      <arg name="state" type="uint" enum="tag_state" summary="The state of the tag."/>
+      <arg name="clients" type="uint" summary="The number of clients in the tag."/>
+      <arg name="focused" type="uint" summary="If there is a focused client. Nonzero being valid, zero being invalid."/>
+    </event>
+
+    <event name="layout">
+      <description summary="Update the layout.">
+        Indicates a new layout is selected.
+      </description>
+      <arg name="layout" type="uint" summary="Index of the layout."/>
+    </event>
+
+    <event name="title">
+      <description summary="Update the title.">
+        Indicates the title has changed.
+      </description>
+      <arg name="title" type="string" summary="The new title name."/>
+    </event>
+
+    <event name="appid" since="2">
+      <description summary="Update the appid.">
+        Indicates the appid has changed.
+      </description>
+      <arg name="appid" type="string" summary="The new appid."/>
+    </event>
+
+    <event name="frame">
+      <description summary="The update sequence is done.">
+        Indicates that a sequence of status updates have finished and the client should redraw.
+      </description>
+    </event>
+
+    <request name="set_layout">
+      <description summary="Set the layout of this output"/>
+      <arg name="index" type="uint" summary="index of a layout recieved by dwl_manager.layout"/>
+    </request>
+
+    <request name="set_tags">
+      <description summary="Set the active tags of this output"/>
+      <arg name="tagmask" type="uint" summary="bitmask of the tags that should be set."/>
+      <arg name="toggle_tagset" type="uint" summary="toggle the selected tagset, zero for invalid, nonzero for valid."/>
+    </request>
+
+    <request name="set_client_tags">
+      <description summary="Set the tags of the focused client.">
+        The tags are updated as follows:
+        new_tags = (current_tags AND and_tags) XOR xor_tags
+      </description>
+      <arg name="and_tags" type="uint"/>
+      <arg name="xor_tags" type="uint"/>
+    </request>
+  </interface>
+</protocol>
diff --git a/protocol/wlr-layer-shell-unstable.xml b/protocol/wlr-layer-shell-unstable.xml
new file mode 100644
index 0000000..d62fd51
--- /dev/null
+++ b/protocol/wlr-layer-shell-unstable.xml
@@ -0,0 +1,390 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="wlr_layer_shell_unstable_v1">
+  <copyright>
+    Copyright © 2017 Drew DeVault
+
+    Permission to use, copy, modify, distribute, and sell this
+    software and its documentation for any purpose is hereby granted
+    without fee, provided that the above copyright notice appear in
+    all copies and that both that copyright notice and this permission
+    notice appear in supporting documentation, and that the name of
+    the copyright holders not be used in advertising or publicity
+    pertaining to distribution of the software without specific,
+    written prior permission.  The copyright holders make no
+    representations about the suitability of this software for any
+    purpose.  It is provided "as is" without express or implied
+    warranty.
+
+    THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+    SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+    FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+    SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+    AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+    ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+    THIS SOFTWARE.
+  </copyright>
+
+  <interface name="zwlr_layer_shell_v1" version="4">
+    <description summary="create surfaces that are layers of the desktop">
+      Clients can use this interface to assign the surface_layer role to
+      wl_surfaces. Such surfaces are assigned to a "layer" of the output and
+      rendered with a defined z-depth respective to each other. They may also be
+      anchored to the edges and corners of a screen and specify input handling
+      semantics. This interface should be suitable for the implementation of
+      many desktop shell components, and a broad number of other applications
+      that interact with the desktop.
+    </description>
+
+    <request name="get_layer_surface">
+      <description summary="create a layer_surface from a surface">
+        Create a layer surface for an existing surface. This assigns the role of
+        layer_surface, or raises a protocol error if another role is already
+        assigned.
+
+        Creating a layer surface from a wl_surface which has a buffer attached
+        or committed is a client error, and any attempts by a client to attach
+        or manipulate a buffer prior to the first layer_surface.configure call
+        must also be treated as errors.
+
+        After creating a layer_surface object and setting it up, the client
+        must perform an initial commit without any buffer attached.
+        The compositor will reply with a layer_surface.configure event.
+        The client must acknowledge it and is then allowed to attach a buffer
+        to map the surface.
+
+        You may pass NULL for output to allow the compositor to decide which
+        output to use. Generally this will be the one that the user most
+        recently interacted with.
+
+        Clients can specify a namespace that defines the purpose of the layer
+        surface.
+      </description>
+      <arg name="id" type="new_id" interface="zwlr_layer_surface_v1"/>
+      <arg name="surface" type="object" interface="wl_surface"/>
+      <arg name="output" type="object" interface="wl_output" allow-null="true"/>
+      <arg name="layer" type="uint" enum="layer" summary="layer to add this surface to"/>
+      <arg name="namespace" type="string" summary="namespace for the layer surface"/>
+    </request>
+
+    <enum name="error">
+      <entry name="role" value="0" summary="wl_surface has another role"/>
+      <entry name="invalid_layer" value="1" summary="layer value is invalid"/>
+      <entry name="already_constructed" value="2" summary="wl_surface has a buffer attached or committed"/>
+    </enum>
+
+    <enum name="layer">
+      <description summary="available layers for surfaces">
+        These values indicate which layers a surface can be rendered in. They
+        are ordered by z depth, bottom-most first. Traditional shell surfaces
+        will typically be rendered between the bottom and top layers.
+        Fullscreen shell surfaces are typically rendered at the top layer.
+        Multiple surfaces can share a single layer, and ordering within a
+        single layer is undefined.
+      </description>
+
+      <entry name="background" value="0"/>
+      <entry name="bottom" value="1"/>
+      <entry name="top" value="2"/>
+      <entry name="overlay" value="3"/>
+    </enum>
+
+    <!-- Version 3 additions -->
+
+    <request name="destroy" type="destructor" since="3">
+      <description summary="destroy the layer_shell object">
+        This request indicates that the client will not use the layer_shell
+        object any more. Objects that have been created through this instance
+        are not affected.
+      </description>
+    </request>
+  </interface>
+
+  <interface name="zwlr_layer_surface_v1" version="4">
+    <description summary="layer metadata interface">
+      An interface that may be implemented by a wl_surface, for surfaces that
+      are designed to be rendered as a layer of a stacked desktop-like
+      environment.
+
+      Layer surface state (layer, size, anchor, exclusive zone,
+      margin, interactivity) is double-buffered, and will be applied at the
+      time wl_surface.commit of the corresponding wl_surface is called.
+
+      Attaching a null buffer to a layer surface unmaps it.
+
+      Unmapping a layer_surface means that the surface cannot be shown by the
+      compositor until it is explicitly mapped again. The layer_surface
+      returns to the state it had right after layer_shell.get_layer_surface.
+      The client can re-map the surface by performing a commit without any
+      buffer attached, waiting for a configure event and handling it as usual.
+    </description>
+
+    <request name="set_size">
+      <description summary="sets the size of the surface">
+        Sets the size of the surface in surface-local coordinates. The
+        compositor will display the surface centered with respect to its
+        anchors.
+
+        If you pass 0 for either value, the compositor will assign it and
+        inform you of the assignment in the configure event. You must set your
+        anchor to opposite edges in the dimensions you omit; not doing so is a
+        protocol error. Both values are 0 by default.
+
+        Size is double-buffered, see wl_surface.commit.
+      </description>
+      <arg name="width" type="uint"/>
+      <arg name="height" type="uint"/>
+    </request>
+
+    <request name="set_anchor">
+      <description summary="configures the anchor point of the surface">
+        Requests that the compositor anchor the surface to the specified edges
+        and corners. If two orthogonal edges are specified (e.g. 'top' and
+        'left'), then the anchor point will be the intersection of the edges
+        (e.g. the top left corner of the output); otherwise the anchor point
+        will be centered on that edge, or in the center if none is specified.
+
+        Anchor is double-buffered, see wl_surface.commit.
+      </description>
+      <arg name="anchor" type="uint" enum="anchor"/>
+    </request>
+
+    <request name="set_exclusive_zone">
+      <description summary="configures the exclusive geometry of this surface">
+        Requests that the compositor avoids occluding an area with other
+        surfaces. The compositor's use of this information is
+        implementation-dependent - do not assume that this region will not
+        actually be occluded.
+
+        A positive value is only meaningful if the surface is anchored to one
+        edge or an edge and both perpendicular edges. If the surface is not
+        anchored, anchored to only two perpendicular edges (a corner), anchored
+        to only two parallel edges or anchored to all edges, a positive value
+        will be treated the same as zero.
+
+        A positive zone is the distance from the edge in surface-local
+        coordinates to consider exclusive.
+
+        Surfaces that do not wish to have an exclusive zone may instead specify
+        how they should interact with surfaces that do. If set to zero, the
+        surface indicates that it would like to be moved to avoid occluding
+        surfaces with a positive exclusive zone. If set to -1, the surface
+        indicates that it would not like to be moved to accommodate for other
+        surfaces, and the compositor should extend it all the way to the edges
+        it is anchored to.
+
+        For example, a panel might set its exclusive zone to 10, so that
+        maximized shell surfaces are not shown on top of it. A notification
+        might set its exclusive zone to 0, so that it is moved to avoid
+        occluding the panel, but shell surfaces are shown underneath it. A
+        wallpaper or lock screen might set their exclusive zone to -1, so that
+        they stretch below or over the panel.
+
+        The default value is 0.
+
+        Exclusive zone is double-buffered, see wl_surface.commit.
+      </description>
+      <arg name="zone" type="int"/>
+    </request>
+
+    <request name="set_margin">
+      <description summary="sets a margin from the anchor point">
+        Requests that the surface be placed some distance away from the anchor
+        point on the output, in surface-local coordinates. Setting this value
+        for edges you are not anchored to has no effect.
+
+        The exclusive zone includes the margin.
+
+        Margin is double-buffered, see wl_surface.commit.
+      </description>
+      <arg name="top" type="int"/>
+      <arg name="right" type="int"/>
+      <arg name="bottom" type="int"/>
+      <arg name="left" type="int"/>
+    </request>
+
+    <enum name="keyboard_interactivity">
+      <description summary="types of keyboard interaction possible for a layer shell surface">
+        Types of keyboard interaction possible for layer shell surfaces. The
+        rationale for this is twofold: (1) some applications are not interested
+        in keyboard events and not allowing them to be focused can improve the
+        desktop experience; (2) some applications will want to take exclusive
+        keyboard focus.
+      </description>
+
+      <entry name="none" value="0">
+        <description summary="no keyboard focus is possible">
+          This value indicates that this surface is not interested in keyboard
+          events and the compositor should never assign it the keyboard focus.
+
+          This is the default value, set for newly created layer shell surfaces.
+
+          This is useful for e.g. desktop widgets that display information or
+          only have interaction with non-keyboard input devices.
+        </description>
+      </entry>
+      <entry name="exclusive" value="1">
+        <description summary="request exclusive keyboard focus">
+          Request exclusive keyboard focus if this surface is above the shell surface layer.
+
+          For the top and overlay layers, the seat will always give
+          exclusive keyboard focus to the top-most layer which has keyboard
+          interactivity set to exclusive. If this layer contains multiple
+          surfaces with keyboard interactivity set to exclusive, the compositor
+          determines the one receiving keyboard events in an implementation-
+          defined manner. In this case, no guarantee is made when this surface
+          will receive keyboard focus (if ever).
+
+          For the bottom and background layers, the compositor is allowed to use
+          normal focus semantics.
+
+          This setting is mainly intended for applications that need to ensure
+          they receive all keyboard events, such as a lock screen or a password
+          prompt.
+        </description>
+      </entry>
+      <entry name="on_demand" value="2" since="4">
+        <description summary="request regular keyboard focus semantics">
+          This requests the compositor to allow this surface to be focused and
+          unfocused by the user in an implementation-defined manner. The user
+          should be able to unfocus this surface even regardless of the layer
+          it is on.
+
+          Typically, the compositor will want to use its normal mechanism to
+          manage keyboard focus between layer shell surfaces with this setting
+          and regular toplevels on the desktop layer (e.g. click to focus).
+          Nevertheless, it is possible for a compositor to require a special
+          interaction to focus or unfocus layer shell surfaces (e.g. requiring
+          a click even if focus follows the mouse normally, or providing a
+          keybinding to switch focus between layers).
+
+          This setting is mainly intended for desktop shell components (e.g.
+          panels) that allow keyboard interaction. Using this option can allow
+          implementing a desktop shell that can be fully usable without the
+          mouse.
+        </description>
+      </entry>
+    </enum>
+
+    <request name="set_keyboard_interactivity">
+      <description summary="requests keyboard events">
+        Set how keyboard events are delivered to this surface. By default,
+        layer shell surfaces do not receive keyboard events; this request can
+        be used to change this.
+
+        This setting is inherited by child surfaces set by the get_popup
+        request.
+
+        Layer surfaces receive pointer, touch, and tablet events normally. If
+        you do not want to receive them, set the input region on your surface
+        to an empty region.
+
+        Keyboard interactivity is double-buffered, see wl_surface.commit.
+      </description>
+      <arg name="keyboard_interactivity" type="uint" enum="keyboard_interactivity"/>
+    </request>
+
+    <request name="get_popup">
+      <description summary="assign this layer_surface as an xdg_popup parent">
+        This assigns an xdg_popup's parent to this layer_surface.  This popup
+        should have been created via xdg_surface::get_popup with the parent set
+        to NULL, and this request must be invoked before committing the popup's
+        initial state.
+
+        See the documentation of xdg_popup for more details about what an
+        xdg_popup is and how it is used.
+      </description>
+      <arg name="popup" type="object" interface="xdg_popup"/>
+    </request>
+
+    <request name="ack_configure">
+      <description summary="ack a configure event">
+        When a configure event is received, if a client commits the
+        surface in response to the configure event, then the client
+        must make an ack_configure request sometime before the commit
+        request, passing along the serial of the configure event.
+
+        If the client receives multiple configure events before it
+        can respond to one, it only has to ack the last configure event.
+
+        A client is not required to commit immediately after sending
+        an ack_configure request - it may even ack_configure several times
+        before its next surface commit.
+
+        A client may send multiple ack_configure requests before committing, but
+        only the last request sent before a commit indicates which configure
+        event the client really is responding to.
+      </description>
+      <arg name="serial" type="uint" summary="the serial from the configure event"/>
+    </request>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy the layer_surface">
+        This request destroys the layer surface.
+      </description>
+    </request>
+
+    <event name="configure">
+      <description summary="suggest a surface change">
+        The configure event asks the client to resize its surface.
+
+        Clients should arrange their surface for the new states, and then send
+        an ack_configure request with the serial sent in this configure event at
+        some point before committing the new surface.
+
+        The client is free to dismiss all but the last configure event it
+        received.
+
+        The width and height arguments specify the size of the window in
+        surface-local coordinates.
+
+        The size is a hint, in the sense that the client is free to ignore it if
+        it doesn't resize, pick a smaller size (to satisfy aspect ratio or
+        resize in steps of NxM pixels). If the client picks a smaller size and
+        is anchored to two opposite anchors (e.g. 'top' and 'bottom'), the
+        surface will be centered on this axis.
+
+        If the width or height arguments are zero, it means the client should
+        decide its own window dimension.
+      </description>
+      <arg name="serial" type="uint"/>
+      <arg name="width" type="uint"/>
+      <arg name="height" type="uint"/>
+    </event>
+
+    <event name="closed">
+      <description summary="surface should be closed">
+        The closed event is sent by the compositor when the surface will no
+        longer be shown. The output may have been destroyed or the user may
+        have asked for it to be removed. Further changes to the surface will be
+        ignored. The client should destroy the resource after receiving this
+        event, and create a new surface if they so choose.
+      </description>
+    </event>
+
+    <enum name="error">
+      <entry name="invalid_surface_state" value="0" summary="provided surface state is invalid"/>
+      <entry name="invalid_size" value="1" summary="size is invalid"/>
+      <entry name="invalid_anchor" value="2" summary="anchor bitfield is invalid"/>
+      <entry name="invalid_keyboard_interactivity" value="3" summary="keyboard interactivity is invalid"/>
+    </enum>
+
+    <enum name="anchor" bitfield="true">
+      <entry name="top" value="1" summary="the top edge of the anchor rectangle"/>
+      <entry name="bottom" value="2" summary="the bottom edge of the anchor rectangle"/>
+      <entry name="left" value="4" summary="the left edge of the anchor rectangle"/>
+      <entry name="right" value="8" summary="the right edge of the anchor rectangle"/>
+    </enum>
+
+    <!-- Version 2 additions -->
+
+    <request name="set_layer" since="2">
+      <description summary="change the layer of the surface">
+        Change the layer that the surface is rendered on.
+
+        Layer is double-buffered, see wl_surface.commit.
+      </description>
+      <arg name="layer" type="uint" enum="zwlr_layer_shell_v1.layer" summary="layer to move this surface to"/>
+    </request>
+  </interface>
+</protocol>
diff --git a/util.c b/util.c
new file mode 100644
index 0000000..2e8a1c8
--- /dev/null
+++ b/util.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "util.h"
+
+void
+die(const char *error)
+{
+	fprintf(stderr, "error: %s\n", error);
+	exit(-1);
+}
diff --git a/util.h b/util.h
new file mode 100644
index 0000000..0feb54a
--- /dev/null
+++ b/util.h
@@ -0,0 +1,6 @@
+#ifndef UTIL_H
+#define UTIL_H
+
+void die(const char *error);
+
+#endif
diff --git a/wayland.c b/wayland.c
new file mode 100644
index 0000000..0787ec3
--- /dev/null
+++ b/wayland.c
@@ -0,0 +1,66 @@
+#include <errno.h>
+#include <time.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include "wayland.h"
+
+static void randname(char *buf);
+static int create_shm_file(void);
+
+
+void
+randname(char *buf)
+{
+	struct timespec ts;
+	long r;
+	int i;
+
+	clock_gettime(CLOCK_REALTIME, &ts);
+	r = ts.tv_nsec;
+	for (i = 0; i < 6; ++i) {
+		buf[i] = 'A'+(r&15)+(r&16)*2;
+		r >>= 5;
+	}
+}
+
+int
+create_shm_file(void)
+{
+	int fd;
+	int retries = 100;
+	char name[] = "/wl_shm-XXXXXX";
+
+	do {
+		randname(name + sizeof(name) - 7);
+		--retries;
+		fd = shm_open(name, O_RDWR | O_CREAT | O_EXCL, 0600);
+		if (fd >= 0) {
+			shm_unlink(name);
+			return fd;
+		}
+	} while (retries > 0 && errno == EEXIST);
+	return -1;
+}
+
+int
+allocate_shm_file(size_t size)
+{
+	int ret;
+	int fd = create_shm_file();
+
+	if (fd < 0)
+		return -1;
+
+	do {
+		ret = ftruncate(fd, size);
+	} while (ret < 0 && errno == EINTR);
+
+	if (ret < 0) {
+		close(fd);
+		return -1;
+	}
+
+	return fd;
+}
diff --git a/wayland.h b/wayland.h
new file mode 100644
index 0000000..5646f48
--- /dev/null
+++ b/wayland.h
@@ -0,0 +1,11 @@
+#ifndef WAYLAND_H
+#define WAYLAND_H
+
+#include <wayland-client.h>
+#include "xdg-shell-protocol.h"
+#include "wlr-layer-shell-protocol.h"
+#include "dwl-bar-ipc-protocol.h"
+
+int allocate_shm_file(size_t size);
+
+#endif