Luna/apps/gclient.cpp

#include <errno.h>
#include <os/ArgumentParser.h>
#include <os/File.h>
#include <os/LocalClient.h>
#include <sys/mman.h>
#include <ui/Canvas.h>
#include <ui/ipc/Server.h>
#include <unistd.h>

struct Window
{
    ui::Canvas canvas;
    int id;

    void set_title(os::LocalClient& client, const char* title)
    {
        ui::SetWindowTitleRequest request;
        request.window = id;
        SET_IPC_STRING(request.title, title);
        os::IPC::send_async(client, request);
    }

    void redraw(os::LocalClient& client)
    {
        ui::InvalidateRequest request;
        request.window = id;
        os::IPC::send_async(client, request);
    }
};

Result<void> handle_ipc_client_event(os::LocalClient&, u8)
{
    todo();
}

static Result<u32*> create_shm_region(const char* path, int* outfd, ui::Rect rect)
{
    int fd = shm_open(path, O_RDWR, 0600);
    shm_unlink(path);
    if (fd < 0) return err(errno);

    usize size = rect.width * rect.height * 4; // 4 bytes per pixel

    void* p = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
    if (p == MAP_FAILED)
    {
        shm_unlink(path);
        close(fd);
        return 0;
    }

    if (outfd) *outfd = fd;
    else
        close(fd);
    return (u32*)p;
}

Result<Window> create_window(os::LocalClient& client, ui::Rect rect)
{
    ui::CreateWindowRequest request;
    request.rect = rect;
    auto response = TRY(os::IPC::send_sync<ui::CreateWindowResponse>(client, request));
    u32* pixels = TRY(create_shm_region(response.shm_path, nullptr, rect));
    return Window { ui::Canvas { rect.width, rect.height, rect.width, (u8*)pixels }, response.window };
}

Result<int> luna_main(int argc, char** argv)
{
    StringView socket_path = "/tmp/wind.sock";

    os::ArgumentParser parser;
    parser.add_description("A graphical user interface client."_sv);
    parser.add_system_program_info("gclient"_sv);
    parser.add_value_argument(socket_path, 's', "socket"_sv, "the path for the local IPC socket"_sv);
    parser.parse(argc, argv);

    auto client = TRY(os::LocalClient::connect(socket_path, false));

    Window window = TRY(create_window(*client, ui::Rect { 200, 200, 400, 300 }));
    os::println("Created new window with id %d!", window.id);

    sleep(3);

    window.set_title(*client, "Example Window");

    sleep(3);

    window.canvas.fill(ui::CYAN);
    window.redraw(*client);

    sleep(3);

    return 0;
}