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-rw-r--r--somebar/src/main.cpp613
1 files changed, 613 insertions, 0 deletions
diff --git a/somebar/src/main.cpp b/somebar/src/main.cpp
new file mode 100644
index 0000000..15a749a
--- /dev/null
+++ b/somebar/src/main.cpp
@@ -0,0 +1,613 @@
+// somebar - dwl bar
+// See LICENSE file for copyright and license details.
+
+#include <algorithm>
+#include <cstdio>
+#include <sstream>
+#include <list>
+#include <optional>
+#include <utility>
+#include <vector>
+#include <fcntl.h>
+#include <poll.h>
+#include <signal.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <linux/input-event-codes.h>
+#include <wayland-client.h>
+#include <wayland-cursor.h>
+#include "wlr-layer-shell-unstable-v1-client-protocol.h"
+#include "xdg-output-unstable-v1-client-protocol.h"
+#include "xdg-shell-client-protocol.h"
+#include "common.hpp"
+#include "config.hpp"
+#include "bar.hpp"
+#include "line_buffer.hpp"
+
+struct Monitor {
+ uint32_t registryName;
+ std::string xdgName;
+ wl_unique_ptr<wl_output> wlOutput;
+ Bar bar;
+ bool desiredVisibility {true};
+ bool hasData;
+ uint32_t tags;
+};
+
+struct SeatPointer {
+ wl_unique_ptr<wl_pointer> wlPointer;
+ Monitor* focusedMonitor;
+ int x, y;
+ std::vector<int> btns;
+};
+struct Seat {
+ uint32_t name;
+ wl_unique_ptr<wl_seat> wlSeat;
+ std::optional<SeatPointer> pointer;
+};
+
+static Monitor* monitorFromSurface(const wl_surface* surface);
+static void setupMonitor(uint32_t name, wl_output* output);
+static void updatemon(Monitor &mon);
+static void onReady();
+static void setupStatusFifo();
+static void onStatus();
+static void onStdin();
+static void handleStdin(const std::string& line);
+static void updateVisibility(const std::string& name, bool(*updater)(bool));
+static void onGlobalAdd(void*, wl_registry* registry, uint32_t name, const char* interface, uint32_t version);
+static void onGlobalRemove(void*, wl_registry* registry, uint32_t name);
+static void requireGlobal(const void* p, const char* name);
+static void waylandFlush();
+static void cleanup();
+
+wl_display* display;
+wl_compositor* compositor;
+wl_shm* shm;
+zwlr_layer_shell_v1* wlrLayerShell;
+static xdg_wm_base* xdgWmBase;
+static zxdg_output_manager_v1* xdgOutputManager;
+static wl_surface* cursorSurface;
+static wl_cursor_image* cursorImage;
+static bool ready;
+static std::list<Monitor> monitors;
+static std::vector<std::pair<uint32_t, wl_output*>> uninitializedOutputs;
+static std::list<Seat> seats;
+static Monitor* selmon;
+static std::string lastStatus;
+static std::string statusFifoName;
+static std::vector<pollfd> pollfds;
+static std::array<int, 2> signalSelfPipe;
+static int displayFd {-1};
+static int statusFifoFd {-1};
+static int statusFifoWriter {-1};
+static bool quitting {false};
+
+void spawn(Monitor&, const Arg& arg)
+{
+ if (fork() == 0) {
+ auto argv = static_cast<char* const*>(arg.v);
+ setsid();
+ execvp(argv[0], argv);
+ fprintf(stderr, "somebar: execvp %s ", argv[0]);
+ perror(" failed");
+ exit(1);
+ }
+}
+
+static const struct xdg_wm_base_listener xdgWmBaseListener = {
+ [](void*, xdg_wm_base* sender, uint32_t serial) {
+ xdg_wm_base_pong(sender, serial);
+ }
+};
+
+static const struct zxdg_output_v1_listener xdgOutputListener = {
+ .logical_position = [](void*, zxdg_output_v1*, int, int) { },
+ .logical_size = [](void*, zxdg_output_v1*, int, int) { },
+ .done = [](void*, zxdg_output_v1*) { },
+ .name = [](void* mp, zxdg_output_v1* xdgOutput, const char* name) {
+ auto& monitor = *static_cast<Monitor*>(mp);
+ monitor.xdgName = name;
+ zxdg_output_v1_destroy(xdgOutput);
+ },
+ .description = [](void*, zxdg_output_v1*, const char*) { },
+};
+
+Monitor* monitorFromSurface(const wl_surface* surface)
+{
+ auto mon = std::find_if(begin(monitors), end(monitors), [surface](const Monitor& mon) {
+ return mon.bar.surface() == surface;
+ });
+ return mon != end(monitors) ? &*mon : nullptr;
+}
+static const struct wl_pointer_listener pointerListener = {
+ .enter = [](void* sp, wl_pointer* pointer, uint32_t serial,
+ wl_surface* surface, wl_fixed_t x, wl_fixed_t y)
+ {
+ auto& seat = *static_cast<Seat*>(sp);
+ seat.pointer->focusedMonitor = monitorFromSurface(surface);
+ if (!cursorImage) {
+ auto cursorTheme = wl_cursor_theme_load(nullptr, 24, shm);
+ cursorImage = wl_cursor_theme_get_cursor(cursorTheme, "left_ptr")->images[0];
+ cursorSurface = wl_compositor_create_surface(compositor);
+ wl_surface_attach(cursorSurface, wl_cursor_image_get_buffer(cursorImage), 0, 0);
+ wl_surface_commit(cursorSurface);
+ }
+ wl_pointer_set_cursor(pointer, serial, cursorSurface,
+ cursorImage->hotspot_x, cursorImage->hotspot_y);
+ },
+ .leave = [](void* sp, wl_pointer*, uint32_t serial, wl_surface*) {
+ auto& seat = *static_cast<Seat*>(sp);
+ seat.pointer->focusedMonitor = nullptr;
+ },
+ .motion = [](void* sp, wl_pointer*, uint32_t, wl_fixed_t x, wl_fixed_t y) {
+ auto& seat = *static_cast<Seat*>(sp);
+ seat.pointer->x = wl_fixed_to_int(x);
+ seat.pointer->y = wl_fixed_to_int(y);
+ },
+ .button = [](void* sp, wl_pointer*, uint32_t, uint32_t, uint32_t button, uint32_t pressed) {
+ auto& seat = *static_cast<Seat*>(sp);
+ auto it = std::find(begin(seat.pointer->btns), end(seat.pointer->btns), button);
+ if (pressed == WL_POINTER_BUTTON_STATE_PRESSED && it == end(seat.pointer->btns)) {
+ seat.pointer->btns.push_back(button);
+ } else if (pressed == WL_POINTER_BUTTON_STATE_RELEASED && it != end(seat.pointer->btns)) {
+ seat.pointer->btns.erase(it);
+ }
+ },
+ .axis = [](void* sp, wl_pointer*, uint32_t, uint32_t, wl_fixed_t) { },
+ .frame = [](void* sp, wl_pointer*) {
+ auto& seat = *static_cast<Seat*>(sp);
+ auto mon = seat.pointer->focusedMonitor;
+ if (!mon) {
+ return;
+ }
+ for (auto btn : seat.pointer->btns) {
+ mon->bar.click(mon, seat.pointer->x, seat.pointer->y, btn);
+ }
+ seat.pointer->btns.clear();
+ },
+ .axis_source = [](void*, wl_pointer*, uint32_t) { },
+ .axis_stop = [](void*, wl_pointer*, uint32_t, uint32_t) { },
+ .axis_discrete = [](void*, wl_pointer*, uint32_t, int32_t) { },
+};
+
+static const struct wl_seat_listener seatListener = {
+ .capabilities = [](void* sp, wl_seat*, uint32_t cap)
+ {
+ auto& seat = *static_cast<Seat*>(sp);
+ auto hasPointer = cap & WL_SEAT_CAPABILITY_POINTER;
+ if (!seat.pointer && hasPointer) {
+ auto &pointer = seat.pointer.emplace();
+ pointer.wlPointer = wl_unique_ptr<wl_pointer> {wl_seat_get_pointer(seat.wlSeat.get())};
+ wl_pointer_add_listener(seat.pointer->wlPointer.get(), &pointerListener, &seat);
+ } else if (seat.pointer && !hasPointer) {
+ seat.pointer.reset();
+ }
+ },
+ .name = [](void*, wl_seat*, const char* name) { }
+};
+
+void setupMonitor(uint32_t name, wl_output* output) {
+ auto& monitor = monitors.emplace_back(Monitor {name, {}, wl_unique_ptr<wl_output> {output}});
+ monitor.bar.setStatus(lastStatus);
+ auto xdgOutput = zxdg_output_manager_v1_get_xdg_output(xdgOutputManager, monitor.wlOutput.get());
+ zxdg_output_v1_add_listener(xdgOutput, &xdgOutputListener, &monitor);
+}
+
+void updatemon(Monitor& mon)
+{
+ if (!mon.hasData) {
+ return;
+ }
+ if (mon.desiredVisibility) {
+ if (mon.bar.visible()) {
+ mon.bar.invalidate();
+ } else {
+ mon.bar.show(mon.wlOutput.get());
+ }
+ } else if (mon.bar.visible()) {
+ mon.bar.hide();
+ }
+}
+
+// called after we have received the initial batch of globals
+void onReady()
+{
+ requireGlobal(compositor, "wl_compositor");
+ requireGlobal(shm, "wl_shm");
+ requireGlobal(wlrLayerShell, "zwlr_layer_shell_v1");
+ requireGlobal(xdgOutputManager, "zxdg_output_manager_v1");
+ setupStatusFifo();
+ wl_display_roundtrip(display); // roundtrip so we receive all dwl tags etc.
+
+ ready = true;
+ for (auto output : uninitializedOutputs) {
+ setupMonitor(output.first, output.second);
+ }
+ wl_display_roundtrip(display); // wait for xdg_output names before we read stdin
+}
+
+bool createFifo(std::string path)
+{
+ auto result = mkfifo(path.c_str(), 0666);
+ if (result == 0) {
+ auto fd = open(path.c_str(), O_CLOEXEC | O_NONBLOCK | O_RDONLY);
+ if (fd < 0) {
+ diesys("open status fifo reader");
+ }
+ statusFifoName = path;
+ statusFifoFd = fd;
+
+ fd = open(path.c_str(), O_CLOEXEC | O_WRONLY);
+ if (fd < 0) {
+ diesys("open status fifo writer");
+ }
+ statusFifoWriter = fd;
+
+ pollfds.push_back({
+ .fd = statusFifoFd,
+ .events = POLLIN,
+ });
+ return true;
+ } else if (errno != EEXIST) {
+ diesys("mkfifo");
+ }
+
+ return false;
+}
+
+void setupStatusFifo()
+{
+ if (!statusFifoName.empty()) {
+ createFifo(statusFifoName);
+ return;
+ }
+
+ for (auto i=0; i<100; i++) {
+ auto path = std::string{getenv("XDG_RUNTIME_DIR")} + "/somebar-" + std::to_string(i);
+ if (createFifo(path)) {
+ return;
+ }
+ }
+}
+
+static LineBuffer<512> stdinBuffer;
+static void onStdin()
+{
+ auto res = stdinBuffer.readLines(
+ [](void* p, size_t size) { return read(0, p, size); },
+ [](char* p, size_t size) { handleStdin({p, size}); });
+ if (res == 0) {
+ quitting = true;
+ }
+}
+
+static void handleStdin(const std::string& line)
+{
+ // this parses the lines that dwl sends in printstatus()
+ std::string monName, command;
+ auto stream = std::istringstream {line};
+ stream >> monName >> command;
+ if (!stream.good()) {
+ return;
+ }
+ auto mon = std::find_if(begin(monitors), end(monitors), [&](const Monitor& mon) {
+ return mon.xdgName == monName;
+ });
+ if (mon == end(monitors))
+ return;
+ if (command == "title") {
+ auto title = std::string {};
+ stream >> std::ws;
+ std::getline(stream, title);
+ mon->bar.setTitle(title);
+ } else if (command == "selmon") {
+ uint32_t selected;
+ stream >> selected;
+ mon->bar.setSelected(selected);
+ if (selected) {
+ selmon = &*mon;
+ } else if (selmon == &*mon) {
+ selmon = nullptr;
+ }
+ } else if (command == "tags") {
+ uint32_t occupied, tags, clientTags, urgent;
+ stream >> occupied >> tags >> clientTags >> urgent;
+ for (auto i=0u; i<tagNames.size(); i++) {
+ auto tagMask = 1 << i;
+ int state = TagState::None;
+ if (tags & tagMask)
+ state |= TagState::Active;
+ if (urgent & tagMask)
+ state |= TagState::Urgent;
+ mon->bar.setTag(i, state, occupied & tagMask ? 1 : 0, clientTags & tagMask ? 0 : -1);
+ }
+ mon->tags = tags;
+ } else if (command == "layout") {
+ auto layout = std::string {};
+ stream >> std::ws;
+ std::getline(stream, layout);
+ mon->bar.setLayout(layout);
+ }
+ mon->hasData = true;
+ updatemon(*mon);
+}
+
+const std::string prefixStatus = "status ";
+const std::string prefixShow = "show ";
+const std::string prefixHide = "hide ";
+const std::string prefixToggle = "toggle ";
+const std::string argAll = "all";
+const std::string argSelected = "selected";
+
+static LineBuffer<512> statusBuffer;
+void onStatus()
+{
+ statusBuffer.readLines(
+ [](void* p, size_t size) {
+ return read(statusFifoFd, p, size);
+ },
+ [](const char* buffer, size_t n) {
+ auto str = std::string {buffer, n};
+ if (str.rfind(prefixStatus, 0) == 0) {
+ lastStatus = str.substr(prefixStatus.size());
+ for (auto &monitor : monitors) {
+ monitor.bar.setStatus(lastStatus);
+ monitor.bar.invalidate();
+ }
+ } else if (str.rfind(prefixShow, 0) == 0) {
+ updateVisibility(str.substr(prefixShow.size()), [](bool) { return true; });
+ } else if (str.rfind(prefixHide, 0) == 0) {
+ updateVisibility(str.substr(prefixHide.size()), [](bool) { return false; });
+ } else if (str.rfind(prefixToggle, 0) == 0) {
+ updateVisibility(str.substr(prefixToggle.size()), [](bool vis) { return !vis; });
+ }
+ });
+}
+
+void updateVisibility(const std::string& name, bool(*updater)(bool))
+{
+ auto isCurrent = name == argSelected;
+ auto isAll = name == argAll;
+ for (auto& mon : monitors) {
+ if (isAll ||
+ isCurrent && &mon == selmon ||
+ mon.xdgName == name) {
+ auto newVisibility = updater(mon.desiredVisibility);
+ if (newVisibility != mon.desiredVisibility) {
+ mon.desiredVisibility = newVisibility;
+ updatemon(mon);
+ }
+ }
+ }
+}
+
+struct HandleGlobalHelper {
+ wl_registry* registry;
+ uint32_t name;
+ const char* interface;
+
+ template<typename T>
+ bool handle(T& store, const wl_interface& iface, int version) {
+ if (strcmp(interface, iface.name)) {
+ return false;
+ }
+ store = static_cast<T>(wl_registry_bind(registry, name, &iface, version));
+ return true;
+ }
+};
+void onGlobalAdd(void*, wl_registry* registry, uint32_t name, const char* interface, uint32_t version)
+{
+ auto reg = HandleGlobalHelper { registry, name, interface };
+ if (reg.handle(compositor, wl_compositor_interface, 4)) return;
+ if (reg.handle(shm, wl_shm_interface, 1)) return;
+ if (reg.handle(wlrLayerShell, zwlr_layer_shell_v1_interface, 1)) return;
+ if (reg.handle(xdgOutputManager, zxdg_output_manager_v1_interface, 3)) return;
+ if (reg.handle(xdgWmBase, xdg_wm_base_interface, 2)) {
+ xdg_wm_base_add_listener(xdgWmBase, &xdgWmBaseListener, nullptr);
+ return;
+ }
+ if (wl_seat* wlSeat; reg.handle(wlSeat, wl_seat_interface, 7)) {
+ auto& seat = seats.emplace_back(Seat {name, wl_unique_ptr<wl_seat> {wlSeat}});
+ wl_seat_add_listener(wlSeat, &seatListener, &seat);
+ return;
+ }
+ if (wl_output* output; reg.handle(output, wl_output_interface, 1)) {
+ if (ready) {
+ setupMonitor(name, output);
+ } else {
+ uninitializedOutputs.push_back({name, output});
+ }
+ return;
+ }
+}
+void onGlobalRemove(void*, wl_registry* registry, uint32_t name)
+{
+ monitors.remove_if([name](const Monitor &mon) { return mon.registryName == name; });
+ seats.remove_if([name](const Seat &seat) { return seat.name == name; });
+}
+static const struct wl_registry_listener registry_listener = {
+ .global = onGlobalAdd,
+ .global_remove = onGlobalRemove,
+};
+
+int main(int argc, char* argv[])
+{
+ int opt;
+ while ((opt = getopt(argc, argv, "chvs:")) != -1) {
+ switch (opt) {
+ case 's':
+ statusFifoName = optarg;
+ break;
+ case 'h':
+ printf("Usage: %s [-h] [-v] [-s path to the fifo] [-c command]\n", argv[0]);
+ printf(" -h: Show this help\n");
+ printf(" -v: Show somebar version\n");
+ printf(" -s: Change path to the fifo (default is \"$XDG_RUNTIME_DIR/somebar-0\")\n");
+ printf(" -c: Sends a command to sombar. See README for details.\n");
+ printf("If any of these are specified (except -s), somebar exits after the action.\n");
+ printf("Otherwise, somebar will display itself.\n");
+ exit(0);
+ case 'v':
+ printf("somebar " SOMEBAR_VERSION "\n");
+ exit(0);
+ case 'c':
+ if (optind >= argc) {
+ die("Expected command");
+ }
+ if (statusFifoName.empty()) {
+ statusFifoName = std::string {getenv("XDG_RUNTIME_DIR")} + "/somebar-0";
+ }
+ statusFifoWriter = open(statusFifoName.c_str(), O_WRONLY | O_CLOEXEC);
+ if (statusFifoWriter < 0) {
+ fprintf(stderr, "could not open %s: ", statusFifoName.c_str());
+ perror("");
+ exit(1);
+ }
+ auto str = std::string {};
+ for (auto i = optind; i<argc; i++) {
+ if (i > optind) str += " ";
+ str += argv[i];
+ }
+ str += "\n";
+ write(statusFifoWriter, str.c_str(), str.size());
+ exit(0);
+ }
+ }
+
+ if (pipe(signalSelfPipe.data()) < 0) {
+ diesys("pipe");
+ }
+ setCloexec(signalSelfPipe[0]);
+ setCloexec(signalSelfPipe[1]);
+
+ struct sigaction sighandler = {};
+ sighandler.sa_handler = [](int) {
+ if (write(signalSelfPipe[1], "0", 1) < 0) {
+ diesys("write");
+ }
+ };
+ if (sigaction(SIGTERM, &sighandler, nullptr) < 0) {
+ diesys("sigaction");
+ }
+ if (sigaction(SIGINT, &sighandler, nullptr) < 0) {
+ diesys("sigaction");
+ }
+
+ struct sigaction chld_handler = {};
+ chld_handler.sa_handler = SIG_IGN;
+ if (sigaction(SIGCHLD, &chld_handler, nullptr) < 0) {
+ die("sigaction");
+ }
+
+ pollfds.push_back({
+ .fd = signalSelfPipe[0],
+ .events = POLLIN,
+ });
+
+ display = wl_display_connect(nullptr);
+ if (!display) {
+ die("Failed to connect to Wayland display");
+ }
+ displayFd = wl_display_get_fd(display);
+
+ auto registry = wl_display_get_registry(display);
+ wl_registry_add_listener(registry, &registry_listener, nullptr);
+ wl_display_roundtrip(display);
+ onReady();
+
+ pollfds.push_back({
+ .fd = displayFd,
+ .events = POLLIN,
+ });
+ pollfds.push_back({
+ .fd = STDIN_FILENO,
+ .events = POLLIN,
+ });
+ if (fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK) < 0) {
+ diesys("fcntl F_SETFL");
+ }
+
+ while (!quitting) {
+ waylandFlush();
+ if (poll(pollfds.data(), pollfds.size(), -1) < 0) {
+ if (errno != EINTR) {
+ diesys("poll");
+ }
+ } else {
+ for (auto& ev : pollfds) {
+ if (ev.revents & POLLNVAL) {
+ die("poll revents contains POLLNVAL");
+ } else if (ev.fd == displayFd) {
+ if (ev.revents & POLLIN) {
+ if (wl_display_dispatch(display) < 0) {
+ die("wl_display_dispatch");
+ }
+ }
+ if (ev.revents & POLLOUT) {
+ ev.events = POLLIN;
+ waylandFlush();
+ }
+ } else if (ev.fd == STDIN_FILENO && (ev.revents & POLLIN)) {
+ onStdin();
+ } else if (ev.fd == statusFifoFd && (ev.revents & POLLIN)) {
+ onStatus();
+ } else if (ev.fd == signalSelfPipe[0] && (ev.revents & POLLIN)) {
+ quitting = true;
+ }
+ }
+ }
+ }
+ cleanup();
+}
+
+void requireGlobal(const void* p, const char* name)
+{
+ if (p) return;
+ fprintf(stderr, "Wayland compositor does not export required global %s, aborting.\n", name);
+ cleanup();
+ exit(1);
+}
+
+void waylandFlush()
+{
+ wl_display_dispatch_pending(display);
+ if (wl_display_flush(display) < 0 && errno == EAGAIN) {
+ for (auto& ev : pollfds) {
+ if (ev.fd == displayFd) {
+ ev.events |= POLLOUT;
+ }
+ }
+ }
+}
+
+void setCloexec(int fd)
+{
+ int flags = fcntl(fd, F_GETFD);
+ if (flags == -1) {
+ diesys("fcntl FD_GETFD");
+ }
+ if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0) {
+ diesys("fcntl FD_SETFD");
+ }
+}
+
+void cleanup() {
+ if (!statusFifoName.empty()) {
+ unlink(statusFifoName.c_str());
+ }
+}
+
+void die(const char* why) {
+ fprintf(stderr, "error: %s failed, aborting\n", why);
+ cleanup();
+ exit(1);
+}
+
+void diesys(const char* why) {
+ perror(why);
+ cleanup();
+ exit(1);
+}
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