#include <X11/Xlib.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <string.h>

void show(struct tm *tm)
{
	char s[6];
	strftime(s, sizeof(s), "%H:%M", tm);
	printf("%s\n", s);
	fflush(stdout);
}

int main() {
	int h, m, init = 60;
	time_t t;
	struct tm *tm;

	while (1) {
		t = time(NULL);
		tm = localtime(&t);
		if (tm->tm_hour != h || tm->tm_min != m || init > 0) {
			show(tm);
			h = tm->tm_hour;
			m = tm->tm_min;
			init = (init > 0) ? init - 1 : 0;
		}
		sleep(1);
	}
	return 1;
}