swaynag: refactor {sway_,}nagbar to swaynag

1 files changed, 413 insertions, 0 deletions

diff --git a/swaynag/swaynag.c b/swaynag/swaynag.c
new file mode 100644
index 00000000..367e0854
--- /dev/null
+++ b/swaynag/swaynag.c
@@ -0,0 +1,413 @@
+#define _XOPEN_SOURCE 500
+#include <assert.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <wayland-client.h>
+#include <wayland-cursor.h>
+#include "log.h"
+#include "list.h"
+#include "swaynag/render.h"
+#include "swaynag/swaynag.h"
+#include "swaynag/types.h"
+#include "wlr-layer-shell-unstable-v1-client-protocol.h"
+
+static void nop() {
+	// Intentionally left blank
+}
+
+static bool terminal_execute(char *terminal, char *command) {
+	char fname[] = "/tmp/swaynagXXXXXX";
+	FILE *tmp= fdopen(mkstemp(fname), "w");
+	if (!tmp) {
+		wlr_log(WLR_ERROR, "Failed to create temp script");
+		return false;
+	}
+	wlr_log(WLR_DEBUG, "Created temp script: %s", fname);
+	fprintf(tmp, "#!/bin/sh\nrm %s\n%s", fname, command);
+	fclose(tmp);
+	chmod(fname, S_IRUSR | S_IWUSR | S_IXUSR);
+	char cmd[strlen(terminal) + strlen(" -e ") + strlen(fname) + 1];
+	sprintf(cmd, "%s -e %s", terminal, fname);
+	execl("/bin/sh", "/bin/sh", "-c", cmd, NULL);
+	return true;
+}
+
+static void swaynag_button_execute(struct swaynag *swaynag,
+		struct swaynag_button *button) {
+	wlr_log(WLR_DEBUG, "Executing [%s]: %s", button->text, button->action);
+	if (button->type == SWAYNAG_ACTION_DISMISS) {
+		swaynag->run_display = false;
+	} else if (button->type == SWAYNAG_ACTION_EXPAND) {
+		swaynag->details.visible = !swaynag->details.visible;
+		render_frame(swaynag);
+	} else {
+		if (fork() == 0) {
+			// Child process. Will be used to prevent zombie processes
+			setsid();
+			if (fork() == 0) {
+				// Child of the child. Will be reparented to the init process
+				char *terminal = getenv("TERMINAL");
+				if (terminal && strlen(terminal)) {
+					wlr_log(WLR_DEBUG, "Found $TERMINAL: %s", terminal);
+					if (!terminal_execute(terminal, button->action)) {
+						swaynag_destroy(swaynag);
+						exit(EXIT_FAILURE);
+					}
+				} else {
+					wlr_log(WLR_DEBUG, "$TERMINAL not found. Running directly");
+					execl("/bin/sh", "/bin/sh", "-c", button->action, NULL);
+				}
+			}
+			exit(EXIT_SUCCESS);
+		}
+	}
+	wait(0);
+}
+
+static void layer_surface_configure(void *data,
+		struct zwlr_layer_surface_v1 *surface,
+		uint32_t serial, uint32_t width, uint32_t height) {
+	struct swaynag *swaynag = data;
+	swaynag->width = width;
+	swaynag->height = height;
+	zwlr_layer_surface_v1_ack_configure(surface, serial);
+	render_frame(swaynag);
+}
+
+static void layer_surface_closed(void *data,
+		struct zwlr_layer_surface_v1 *surface) {
+	struct swaynag *swaynag = data;
+	swaynag_destroy(swaynag);
+}
+
+static struct zwlr_layer_surface_v1_listener layer_surface_listener = {
+	.configure = layer_surface_configure,
+	.closed = layer_surface_closed,
+};
+
+static void wl_pointer_enter(void *data, struct wl_pointer *wl_pointer,
+		uint32_t serial, struct wl_surface *surface,
+		wl_fixed_t surface_x, wl_fixed_t surface_y) {
+	struct swaynag *swaynag = data;
+	struct swaynag_pointer *pointer = &swaynag->pointer;
+	wl_surface_set_buffer_scale(pointer->cursor_surface, swaynag->scale);
+	wl_surface_attach(pointer->cursor_surface,
+			wl_cursor_image_get_buffer(pointer->cursor_image), 0, 0);
+	wl_pointer_set_cursor(wl_pointer, serial, pointer->cursor_surface,
+			pointer->cursor_image->hotspot_x / swaynag->scale,
+			pointer->cursor_image->hotspot_y / swaynag->scale);
+	wl_surface_commit(pointer->cursor_surface);
+}
+
+static void wl_pointer_motion(void *data, struct wl_pointer *wl_pointer,
+		uint32_t time, wl_fixed_t surface_x, wl_fixed_t surface_y) {
+	struct swaynag *swaynag = data;
+	swaynag->pointer.x = wl_fixed_to_int(surface_x);
+	swaynag->pointer.y = wl_fixed_to_int(surface_y);
+}
+
+static void wl_pointer_button(void *data, struct wl_pointer *wl_pointer,
+		uint32_t serial, uint32_t time, uint32_t button, uint32_t state) {
+	struct swaynag *swaynag = data;
+
+	if (state != WL_POINTER_BUTTON_STATE_PRESSED) {
+		return;
+	}
+
+	double x = swaynag->pointer.x * swaynag->scale;
+	double y = swaynag->pointer.y * swaynag->scale;
+	for (int i = 0; i < swaynag->buttons->length; i++) {
+		struct swaynag_button *nagbutton = swaynag->buttons->items[i];
+		if (x >= nagbutton->x
+				&& y >= nagbutton->y
+				&& x < nagbutton->x + nagbutton->width
+				&& y < nagbutton->y + nagbutton->height) {
+			swaynag_button_execute(swaynag, nagbutton);
+			return;
+		}
+	}
+
+	if (swaynag->details.visible &&
+			swaynag->details.total_lines != swaynag->details.visible_lines) {
+		struct swaynag_button button_up = swaynag->details.button_up;
+		if (x >= button_up.x
+				&& y >= button_up.y
+				&& x < button_up.x + button_up.width
+				&& y < button_up.y + button_up.height
+				&& swaynag->details.offset > 0) {
+			swaynag->details.offset--;
+			render_frame(swaynag);
+			return;
+		}
+
+		struct swaynag_button button_down = swaynag->details.button_down;
+		int bot = swaynag->details.total_lines - swaynag->details.visible_lines;
+		if (x >= button_down.x
+				&& y >= button_down.y
+				&& x < button_down.x + button_down.width
+				&& y < button_down.y + button_down.height
+				&& swaynag->details.offset < bot) {
+			swaynag->details.offset++;
+			render_frame(swaynag);
+			return;
+		}
+	}
+}
+
+static void wl_pointer_axis(void *data, struct wl_pointer *wl_pointer,
+		uint32_t time, uint32_t axis, wl_fixed_t value) {
+	struct swaynag *swaynag = data;
+	if (!swaynag->details.visible
+			|| swaynag->pointer.x < swaynag->details.x
+			|| swaynag->pointer.y < swaynag->details.y
+			|| swaynag->pointer.x >= swaynag->details.x + swaynag->details.width
+			|| swaynag->pointer.y >= swaynag->details.y + swaynag->details.height
+			|| swaynag->details.total_lines == swaynag->details.visible_lines) {
+		return;
+	}
+
+	int direction = wl_fixed_to_int(value);
+	int bot = swaynag->details.total_lines - swaynag->details.visible_lines;
+	if (direction < 0 && swaynag->details.offset > 0) {
+		swaynag->details.offset--;
+	} else if (direction > 0 && swaynag->details.offset < bot) {
+		swaynag->details.offset++;
+	}
+
+	render_frame(swaynag);
+}
+
+static struct wl_pointer_listener pointer_listener = {
+	.enter = wl_pointer_enter,
+	.leave = nop,
+	.motion = wl_pointer_motion,
+	.button = wl_pointer_button,
+	.axis = wl_pointer_axis,
+	.frame = nop,
+	.axis_source = nop,
+	.axis_stop = nop,
+	.axis_discrete = nop,
+};
+
+static void seat_handle_capabilities(void *data, struct wl_seat *wl_seat,
+		enum wl_seat_capability caps) {
+	struct swaynag *swaynag = data;
+	if ((caps & WL_SEAT_CAPABILITY_POINTER)) {
+		swaynag->pointer.pointer = wl_seat_get_pointer(wl_seat);
+		wl_pointer_add_listener(swaynag->pointer.pointer, &pointer_listener,
+				swaynag);
+	}
+}
+
+const struct wl_seat_listener seat_listener = {
+	.capabilities = seat_handle_capabilities,
+	.name = nop,
+};
+
+static void output_scale(void *data, struct wl_output *output,
+		int32_t factor) {
+	struct swaynag *swaynag = data;
+	swaynag->scale = factor;
+	render_frame(swaynag);
+}
+
+static struct wl_output_listener output_listener = {
+	.geometry = nop,
+	.mode = nop,
+	.done = nop,
+	.scale = output_scale,
+};
+
+struct output_state {
+	struct wl_output *wl_output;
+	uint32_t wl_name;
+	struct zxdg_output_v1 *xdg_output;
+	struct swaynag *swaynag;
+};
+
+static void xdg_output_handle_name(void *data,
+		struct zxdg_output_v1 *xdg_output, const char *name) {
+	struct output_state *state = data;
+	char *outname = state->swaynag->output.name;
+	wlr_log(WLR_DEBUG, "Checking against output %s for %s", name, outname);
+	if (outname && !state->swaynag->output.wl_output) {
+		wlr_log(WLR_DEBUG, "Using output %s", name);
+		state->swaynag->output.wl_output = state->wl_output;
+		state->swaynag->output.wl_name = state->wl_name;
+		wl_output_add_listener(state->swaynag->output.wl_output,
+				&output_listener, state->swaynag);
+		wl_display_roundtrip(state->swaynag->display);
+		zxdg_output_v1_destroy(state->xdg_output);
+	} else {
+		zxdg_output_v1_destroy(state->xdg_output);
+		wl_output_destroy(state->wl_output);
+	}
+	state->swaynag->querying_outputs--;
+	free(state);
+}
+
+static struct zxdg_output_v1_listener xdg_output_listener = {
+	.logical_position = nop,
+	.logical_size = nop,
+	.done = nop,
+	.name = xdg_output_handle_name,
+	.description = nop,
+};
+
+static void handle_global(void *data, struct wl_registry *registry,
+		uint32_t name, const char *interface, uint32_t version) {
+	struct swaynag *swaynag = data;
+	if (strcmp(interface, wl_compositor_interface.name) == 0) {
+		swaynag->compositor = wl_registry_bind(registry, name,
+				&wl_compositor_interface, 3);
+	} else if (strcmp(interface, wl_seat_interface.name) == 0) {
+		swaynag->seat = wl_registry_bind(registry, name, &wl_seat_interface, 1);
+		wl_seat_add_listener(swaynag->seat, &seat_listener, swaynag);
+	} else if (strcmp(interface, wl_shm_interface.name) == 0) {
+		swaynag->shm = wl_registry_bind(registry, name, &wl_shm_interface, 1);
+	} else if (strcmp(interface, wl_output_interface.name) == 0) {
+		if (!swaynag->output.wl_output && swaynag->xdg_output_manager) {
+			swaynag->querying_outputs++;
+			struct output_state *state =
+				calloc(1, sizeof(struct output_state));
+			state->swaynag = swaynag;
+			state->wl_output = wl_registry_bind(registry, name,
+					&wl_output_interface, 3);
+			state->wl_name = name;
+			state->xdg_output = zxdg_output_manager_v1_get_xdg_output(
+					swaynag->xdg_output_manager, state->wl_output);
+			zxdg_output_v1_add_listener(state->xdg_output,
+					&xdg_output_listener, state);
+		}
+	} else if (strcmp(interface, zwlr_layer_shell_v1_interface.name) == 0) {
+		swaynag->layer_shell = wl_registry_bind(
+				registry, name, &zwlr_layer_shell_v1_interface, 1);
+	} else if (strcmp(interface, zxdg_output_manager_v1_interface.name) == 0
+			&& version >= ZXDG_OUTPUT_V1_NAME_SINCE_VERSION) {
+		swaynag->xdg_output_manager = wl_registry_bind(registry, name,
+				&zxdg_output_manager_v1_interface,
+				ZXDG_OUTPUT_V1_NAME_SINCE_VERSION);
+	}
+}
+
+static void handle_global_remove(void *data, struct wl_registry *registry,
+		uint32_t name) {
+	struct swaynag *swaynag = data;
+	if (swaynag->output.wl_name == name) {
+		swaynag->run_display = false;
+	}
+}
+
+static const struct wl_registry_listener registry_listener = {
+	.global = handle_global,
+	.global_remove = handle_global_remove,
+};
+
+void swaynag_setup(struct swaynag *swaynag) {
+	swaynag->display = wl_display_connect(NULL);
+	assert(swaynag->display);
+
+	swaynag->scale = 1;
+
+	struct wl_registry *registry = wl_display_get_registry(swaynag->display);
+	wl_registry_add_listener(registry, &registry_listener, swaynag);
+	wl_display_roundtrip(swaynag->display);
+	assert(swaynag->compositor && swaynag->layer_shell && swaynag->shm);
+
+	while (swaynag->querying_outputs > 0) {
+		wl_display_roundtrip(swaynag->display);
+	}
+
+	if (!swaynag->output.wl_output && swaynag->output.name) {
+		wlr_log(WLR_ERROR, "Output '%s' not found", swaynag->output.name);
+		swaynag_destroy(swaynag);
+		exit(EXIT_FAILURE);
+	}
+
+	struct swaynag_pointer *pointer = &swaynag->pointer;
+	int scale = swaynag->scale < 1 ? 1 : swaynag->scale;
+	pointer->cursor_theme = wl_cursor_theme_load(
+			NULL, 24 * scale, swaynag->shm);
+	assert(pointer->cursor_theme);
+	struct wl_cursor *cursor =
+		wl_cursor_theme_get_cursor(pointer->cursor_theme, "left_ptr");
+	assert(cursor);
+	pointer->cursor_image = cursor->images[0];
+	pointer->cursor_surface = wl_compositor_create_surface(swaynag->compositor);
+	assert(pointer->cursor_surface);
+
+	swaynag->surface = wl_compositor_create_surface(swaynag->compositor);
+	assert(swaynag->surface);
+	swaynag->layer_surface = zwlr_layer_shell_v1_get_layer_surface(
+			swaynag->layer_shell, swaynag->surface, swaynag->output.wl_output,
+			ZWLR_LAYER_SHELL_V1_LAYER_TOP, "swaynag");
+	assert(swaynag->layer_surface);
+	zwlr_layer_surface_v1_add_listener(swaynag->layer_surface,
+			&layer_surface_listener, swaynag);
+	zwlr_layer_surface_v1_set_anchor(swaynag->layer_surface, swaynag->anchors);
+
+	wl_registry_destroy(registry);
+}
+
+void swaynag_run(struct swaynag *swaynag) {
+	swaynag->run_display = true;
+	render_frame(swaynag);
+	while (swaynag->run_display
+			&& wl_display_dispatch(swaynag->display) != -1) {
+		// This is intentionally left blank
+	}
+}
+
+void swaynag_destroy(struct swaynag *swaynag) {
+	swaynag->run_display = false;
+
+	free(swaynag->message);
+	free(swaynag->font);
+	while (swaynag->buttons->length) {
+		struct swaynag_button *button = swaynag->buttons->items[0];
+		list_del(swaynag->buttons, 0);
+		free(button->text);
+		free(button->action);
+		free(button);
+	}
+	list_free(swaynag->buttons);
+	free(swaynag->details.message);
+	free(swaynag->details.button_up.text);
+	free(swaynag->details.button_down.text);
+
+	if (swaynag->type) {
+		swaynag_type_free(swaynag->type);
+	}
+
+	if (swaynag->layer_surface) {
+		zwlr_layer_surface_v1_destroy(swaynag->layer_surface);
+	}
+
+	if (swaynag->surface) {
+		wl_surface_destroy(swaynag->surface);
+	}
+
+	if (swaynag->output.wl_output) {
+		wl_output_destroy(swaynag->output.wl_output);
+	}
+
+	if (&swaynag->buffers[0]) {
+		destroy_buffer(&swaynag->buffers[0]);
+	}
+
+	if (&swaynag->buffers[1]) {
+		destroy_buffer(&swaynag->buffers[1]);
+	}
+
+	if (swaynag->compositor) {
+		wl_compositor_destroy(swaynag->compositor);
+	}
+
+	if (swaynag->shm) {
+		wl_shm_destroy(swaynag->shm);
+	}
+
+	if (swaynag->display) {
+		wl_display_disconnect(swaynag->display);
+	}
+}