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);
+        }
+}