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/*
* wcal - ISO weekly calendar
*
* To the extent possible under law, Leah Neukirchen <leah@vuxu.org>
* has waived all copyright and related or neighboring rights to this work.
* http://creativecommons.org/publicdomain/zero/1.0/
*/
/*
* -1 show current month (default)
* -3 show three months
* -y show whole year
* -c show current week only
* -i print infinite calendar
* -d YYYY-MM-DD different value for today
*/
#define _XOPEN_SOURCE 700
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
int flag1, flag3, flagc, flagC, flagi, flagy;
void
parse_isodate(char *optarg, struct tm *tm)
{
tm->tm_hour = tm->tm_min = tm->tm_sec = 0;
tm->tm_mday = 1;
tm->tm_mon = 0;
if (isdigit(optarg[0]) &&
isdigit(optarg[1]) &&
isdigit(optarg[2]) &&
isdigit(optarg[3]) &&
(!optarg[4] || optarg[4] == '-')) {
tm->tm_year = atoi(optarg) - 1900;
if (!optarg[4]) {
flagy = 1;
} else if (isdigit(optarg[5]) && isdigit(optarg[6]) &&
(!optarg[7] || optarg[7] == '-')) {
tm->tm_mon = atoi(optarg+5) - 1;
if (isdigit(optarg[8]) && isdigit(optarg[9]) &&
(!optarg[10] || optarg[10] == '-'))
tm->tm_mday = atoi(optarg+8);
}
}
mktime(tm);
}
int
main(int argc, char *argv[])
{
time_t now = time(0);
struct tm *tm = localtime(&now);
struct tm tm2 = {
.tm_year = tm->tm_year,
.tm_mon = tm->tm_mon,
.tm_mday = tm->tm_mday
};
setenv("TZ", "", 1);
tzset();
now = mktime(&tm2);
tm = gmtime(&now);
int c;
while ((c = getopt(argc, argv, "13cCid:y")) != -1)
switch (c) {
case '1': flag1 = 1; break;
case '3': flag3 = 1; break;
case 'c': flagc = 1; break;
case 'C': flagC = 1; break;
case 'y': flagy = 1; break;
case 'i': flagi = 1; break;
case 'd': parse_isodate(optarg, tm); break;
}
tm->tm_hour = tm->tm_min = tm->tm_sec = 0;
int today_mday = tm->tm_mday;
int today_mon = tm->tm_mon;
int today_year = tm->tm_year;
int max_weeks = 1;
int max_months = 0;
if (flagc) {
max_weeks = 1;
} else if (flag3) {
tm->tm_mday = 1; tm->tm_mon--; max_weeks = 14;
} else if (flagy) {
tm->tm_mday = 1; tm->tm_mon = 0; max_months = 12; max_weeks = 53;
} else if (flagi) {
tm->tm_mday = 1;
} else { /* flag1 is default */
tm->tm_mday = 1; max_months = 1; max_weeks = 6;
}
mktime(tm);
while (tm->tm_wday != 1) {
tm->tm_mday--;
mktime(tm);
}
int color = isatty(1) || flagC;
printf(" %sMo Tu We Th Fr Sa Su%s\n",
color ? "\e[4m" : "",
color ? "\e[0m" : "");
for (int weeks = 0, months = 0;
flagi || (max_months && months < max_months) || (weeks < max_weeks);
weeks++) {
char buf[8];
strftime(buf, sizeof buf, "%V", tm);
printf("%s ", buf);
tm->tm_mday += 6;
mktime(tm);
if (tm->tm_mday <= 7 || weeks == 0) {
strftime(buf, sizeof buf, "%b", tm);
printf("%s ", buf);
months++;
} else if ((tm->tm_mon == 0 && tm->tm_yday < 14) || weeks == 1) {
printf("%04d", tm->tm_year + 1900);
} else {
printf(" ");
}
tm->tm_mday -= 6;
mktime(tm);
for (int i = 0; i < 7; i++) {
int today =
tm->tm_mday == today_mday &&
tm->tm_mon == today_mon &&
tm->tm_year == today_year;
printf(" %s%2d%s",
color && today ? "\e[7m" : "",
tm->tm_mday,
color && today ? "\e[0m" : "");
tm->tm_mday++;
mktime(tm);
}
printf("\n");
}
}
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