clock.c

/*
 * Thanks to xorg62 for tty-clock
 */
#include <stdlib.h>
#include <time.h>
#include <ncurses.h>
#include <signal.h>
#include <stdbool.h>
/* Available:
 * COLOR_BLACK
 * COLOR_RED
 * COLOR_GREEN
 * COLOR_YELLOW
 * COLOR_BLUE
 * COLOR_MAGENTA
 * COLOR_CYAN
 * COLOR_WHITE */
#define DEFAULT_FG_COLOR COLOR_BLUE
#define DEFAULT_FG_COLOR_NAME "blue"

typedef struct {
    bool running;
    int bg;
    struct {
        int color;
        long delay;
    } option;
    struct {
        int x, y, w, h;
    } geo;
    struct {
        unsigned int hour[2];
        unsigned int minute[2];
        unsigned int second[2];
    } date;

    struct tm *tm;
    time_t lt;

    WINDOW *framewin;

} cliclock_t;

static void init(void);
static void update_hour(void);
static void draw_number(int n, int x, int y);
static void draw_clock(void);
static void clock_move(int x, int y);
static void signal_handler(int signal);

cliclock_t *cliclock;

static const bool number[][15] = {
    {1,1,1,1,0,1,1,0,1,1,0,1,1,1,1}, /* 0 */
    {0,0,1,0,0,1,0,0,1,0,0,1,0,0,1}, /* 1 */
    {1,1,1,0,0,1,1,1,1,1,0,0,1,1,1}, /* 2 */
    {1,1,1,0,0,1,1,1,1,0,0,1,1,1,1}, /* 3 */
    {1,0,1,1,0,1,1,1,1,0,0,1,0,0,1}, /* 4 */
    {1,1,1,1,0,0,1,1,1,0,0,1,1,1,1}, /* 5 */
    {1,1,1,1,0,0,1,1,1,1,0,1,1,1,1}, /* 6 */
    {1,1,1,0,0,1,0,0,1,0,0,1,0,0,1}, /* 7 */
    {1,1,1,1,0,1,1,1,1,1,0,1,1,1,1}, /* 8 */
    {1,1,1,1,0,1,1,1,1,0,0,1,1,1,1}, /* 9 */
};
static void init(void)
{
    struct sigaction sig;
    cliclock->bg = 0;

    initscr();
    cbreak();
    noecho();
    keypad(stdscr, true);
    start_color();
    curs_set(false);
    clear();
    if(use_default_colors() == OK)
        cliclock->bg = -1;
    /* Init color pair */
    init_pair(0, cliclock->bg, cliclock->bg);
    init_pair(1, cliclock->bg, cliclock->option.color);
    init_pair(2, cliclock->option.color, cliclock->bg);

    refresh();

    /* Init signal handler */
    sig.sa_handler = signal_handler;
    sig.sa_flags   = 0;
    sigaction(SIGWINCH, &sig, NULL);
    sigaction(SIGTERM,  &sig, NULL);

    /* Init global struct */ 
    cliclock->running = true;
    if(!cliclock->geo.x)
        cliclock->geo.x = 0;
    if(!cliclock->geo.y)
        cliclock->geo.y = 0;
    cliclock->geo.w = 54;
    cliclock->geo.h = 7;
    cliclock->tm = localtime(&(cliclock->lt));
    cliclock->lt = time(NULL);
    update_hour();

    /* Create clock win */ 
    cliclock->framewin = newwin(cliclock->geo.h,
            cliclock->geo.w,
            cliclock->geo.x,
            cliclock->geo.y);
    clock_move((LINES / 2 - (cliclock->geo.h / 2)),
            (COLS  / 2 - (cliclock->geo.w / 2)));
    wborder(cliclock->framewin, ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ');
    nodelay(stdscr, true);
    wrefresh(cliclock->framewin);

    return;
}
static void signal_handler(int signal)
{
    switch(signal) {
        case SIGWINCH: /* window resize signal */
            endwin();
            init();
            break;
        case SIGTERM:
            cliclock->running = false; /* interruption signal */
    }
    return;
}
static void update_hour(void)
{
    int ihour;
    cliclock->tm = localtime(&(cliclock->lt));
    cliclock->lt = time(NULL);
    ihour = cliclock->tm->tm_hour;
    /* Set hour */
    cliclock->date.hour[0] = ihour / 10;
    cliclock->date.hour[1] = ihour % 10;
    /* Set minutes */
    cliclock->date.minute[0] = cliclock->tm->tm_min / 10;
    cliclock->date.minute[1] = cliclock->tm->tm_min % 10;
    /* Set seconds */
    cliclock->date.second[0] = cliclock->tm->tm_sec / 10;
    cliclock->date.second[1] = cliclock->tm->tm_sec % 10;
    return;
}
static void draw_number(int n, int x, int y)
{
    int i, sy = y;

    for(i = 0; i < 30; ++i, ++sy) {
        if(sy == y + 6) {
            sy = y;
            ++x;
        }
        wbkgdset(cliclock->framewin, COLOR_PAIR(number[n][i/2]));
        mvwaddch(cliclock->framewin, x, sy, ' ');
    }
    wrefresh(cliclock->framewin);

    return;
}
static void draw_clock(void)
{
    /* Draw hour numbers */
    draw_number(cliclock->date.hour[0], 1, 1);
    draw_number(cliclock->date.hour[1], 1, 8);
    /* 2 dot for number separation */
    wbkgdset(cliclock->framewin, COLOR_PAIR(1));
    mvwaddstr(cliclock->framewin, 2, 16, "  ");
    mvwaddstr(cliclock->framewin, 4, 16, "  ");
    /* Draw minute numbers */
    draw_number(cliclock->date.minute[0], 1, 20);
    draw_number(cliclock->date.minute[1], 1, 27);
    /* 2 dot for number separation */
    wbkgdset(cliclock->framewin, COLOR_PAIR(1));
    mvwaddstr(cliclock->framewin, 2, 35, "  ");
    mvwaddstr(cliclock->framewin, 4, 35, "  ");
    /* Draw second numbers */
    draw_number(cliclock->date.second[0], 1, 39);
    draw_number(cliclock->date.second[1], 1, 46);
}
static void clock_move(int x, int y)
{
    mvwin(cliclock->framewin, (cliclock->geo.x = x), (cliclock->geo.y = y));
    return;
}
static void key_event(void)
{
    int c;
    struct timespec length = { 0, cliclock->option.delay };
    switch(c = wgetch(stdscr)) {
        case 'q':
            cliclock->running = false;
            break;
        default:
            nanosleep(&length, NULL);
            break;
    }
    return;
}
int main(void)
{
    int color = DEFAULT_FG_COLOR;
    cliclock = malloc(sizeof(cliclock_t));
    cliclock->option.color = color;
    cliclock->option.delay = 40000000;
    init();
    while(cliclock->running) {
        update_hour();
        draw_clock();
        key_event();
    }
    free(cliclock);
    endwin();
    return 0;
}