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#include <time.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#define DATEFMT "%a %d %b %Y"
#define SEP " ~> "
typedef struct event {
char *name;
time_t time;
} event;
static bool cal = true;
static const char *days[] = {
"Su",
"Mo",
"Tu",
"We",
"Th",
"Fr",
"Sa"
};
static const char *months[] = {
"Jan",
"Feb",
"Mar",
"Apr",
"May",
"Jun",
"Jul",
"Aug",
"Sep",
"Oct",
"Nov",
"Dec"
};
static const int daysinmonth[] = {
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
static bool
isleap(int year) {
if ((year % 4) == 0 && (year % 100) != 0)
return true;
else if ((year % 400) == 0)
return true;
return false;
}
static void
print_month(struct tm *t) {
printf(" %s %d\n", months[t->tm_mon], t->tm_year + 1900);
}
static void
print_days() {
for (int i = 0; i < 7; i++)
printf("%s ", days[i]);
putchar('\n');
}
static void
print_padded(int n, int l) {
int i = 1;
loop:
if ((n / i) > 0) {
i *= 10;
l--;
goto loop;
}
if (l != 0)
printf("%*s", l, " ");
if (l < 0)
return;
printf("%d", n);
}
static void
print_month_grid(struct tm *t) {
int day = 1;
int total = daysinmonth[t->tm_mon];
if (t->tm_mon == 1 && isleap(t->tm_year + 1900))
total += 1;
int offset = (t->tm_yday % 7) - 1;
for (int i = 0; i < offset; i++)
printf(" ");
for (; day < total + 1; day++) {
if (day == t->tm_mday) {
printf("\e[4;34m");
print_padded(day, 2);
printf("\e[0m");
} else
print_padded(day, 2);
putchar(' ');
if (((day + offset) % 7) == 0)
putchar('\n');
}
putchar('\n');
}
static void
print_cal(struct tm *t) {
print_month(t);
print_days();
print_month_grid(t);
}
static event *
read_event(FILE *f) {
event *e = malloc(sizeof(event));
char buf[256] = {0};
if (!fgets(buf, 256, f)) {
free(e);
return NULL;
}
char *time = buf;
char *name = strchr(buf, '|');
if (!name) {
fprintf(stderr, "invalid event! %s\n", buf);
exit(1);
}
*name = 0;
name++;
e->name = strdup(name);
e->time = atoll(time);
return e;
}
static void
print_event(event *e) {
struct tm *t = localtime(&e->time);
char buf[256];
strftime(buf, 256, DATEFMT, t);
printf("%s" SEP "%s", buf, e->name);
}
static void
free_event(event *e) {
free(e->name);
free(e);
}
int
main(int argc, char **argv) {
if (argc > 1)
if (strcmp(argv[1], "-h") == 0)
cal = false;
time_t ulocal = time(NULL);
struct tm *local = localtime(&ulocal);
if (cal)
print_cal(local);
bool dirty = false;
event *e;
while (e = read_event(stdin)) {
if (ulocal + (86400 * 30) > e->time) {
print_event(e);
dirty = true;
}
free_event(e);
}
if (!dirty)
printf("You have nothing upcoming\n");
return 0;
}
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