211 lines
8.5 KiB
Tcl
211 lines
8.5 KiB
Tcl
# Time - a module for dealing with dates and times
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use ./time_defs.h
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enum Weekday(Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday)
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struct TimeInfo(year,month,day,hour,minute,second,nanosecond:Int, weekday:Weekday, day_of_year:Int, timezone:Text)
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struct Time(tv_sec:Int64, tv_usec:Int64; extern):
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func now(->Time):
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return inline C : Time {
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struct timespec ts;
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if (clock_gettime(CLOCK_REALTIME, &ts) != 0)
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fail("Couldn't get the time!");
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(Time){.tv_sec=ts.tv_sec, .tv_usec=ts.tv_nsec/1000};
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}
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func local_timezone(->Text):
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inline C {
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if (_local_timezone.length < 0) {
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static char buf[PATH_MAX];
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ssize_t len = readlink("/etc/localtime", buf, sizeof(buf));
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if (len < 0)
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fail("Could not get local tz!");
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char *zoneinfo = strstr(buf, "/zoneinfo/");
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if (zoneinfo)
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_local_timezone = Text$from_str(zoneinfo + strlen("/zoneinfo/"));
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else
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fail("Could not resolve local tz!");
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}
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}
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return inline C : Text { _local_timezone; }
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func set_local_timezone(timezone:Text):
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inline C {
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setenv("TZ", Text$as_c_string(_$timezone), 1);
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_local_timezone = _$timezone;
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tzset();
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}
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func format(t:Time, format="%c", timezone=Time.local_timezone() -> Text):
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return inline C : Text {
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struct tm result;
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time_t time = _$t.tv_sec;
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struct tm *final_info;
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WITH_TIMEZONE(_$timezone, final_info = localtime_r(&time, &result));
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static char buf[256];
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size_t len = strftime(buf, sizeof(buf), String(_$format), final_info);
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Text$from_strn(buf, len);
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}
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func new(year,month,day:Int, hour=0, minute=0, second=0.0, timezone=Time.local_timezone() -> Time):
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return inline C : Time{
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struct tm info = {
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.tm_min=Int32$from_int(_$minute, false),
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.tm_hour=Int32$from_int(_$hour, false),
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.tm_mday=Int32$from_int(_$day, false),
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.tm_mon=Int32$from_int(_$month, false) - 1,
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.tm_year=Int32$from_int(_$year, false) - 1900,
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.tm_isdst=-1,
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};
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time_t t;
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WITH_TIMEZONE(_$timezone, t = mktime(&info));
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(Time){.tv_sec=t + (time_t)_$second, .tv_usec=(suseconds_t)(fmod(_$second, 1.0) * 1e9)};
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}
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func unix_timestamp(t:Time -> Int64):
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return inline C : Int64 { (int64_t)_$t.tv_sec }
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func from_unix_timestamp(timestamp:Int64 -> Time):
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return inline C : Time { (Time){.tv_sec=_$timestamp}; }
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func seconds_till(t:Time, target:Time -> Num):
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seconds := Num(target.tv_sec - t.tv_sec)
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seconds += 1e-9*Num(target.tv_usec - t.tv_usec)
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return seconds
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func minutes_till(t:Time, target:Time -> Num):
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return t:seconds_till(target)/60.
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func hours_till(t:Time, target:Time -> Num):
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return t:seconds_till(target)/3600.
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func relative(t:Time, relative_to=Time.now(), timezone=Time.local_timezone() -> Text):
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inline C {
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struct tm info = {};
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struct tm relative_info = {};
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WITH_TIMEZONE(_$timezone, {
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localtime_r(&_$t.tv_sec, &info);
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localtime_r(&_$relative_to.tv_sec, &relative_info);
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});
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double second_diff = _$time$Time$seconds_till(_$relative_to, _$t);
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if (info.tm_year != relative_info.tm_year && fabs(second_diff) > 365.*24.*60.*60.)
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return num_format((long)info.tm_year - (long)relative_info.tm_year, "year");
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else if (info.tm_mon != relative_info.tm_mon && fabs(second_diff) > 31.*24.*60.*60.)
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return num_format(12*((long)info.tm_year - (long)relative_info.tm_year) + (long)info.tm_mon - (long)relative_info.tm_mon, "month");
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else if (info.tm_yday != relative_info.tm_yday && fabs(second_diff) > 24.*60.*60.)
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return num_format(round(second_diff/(24.*60.*60.)), "day");
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else if (info.tm_hour != relative_info.tm_hour && fabs(second_diff) > 60.*60.)
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return num_format(round(second_diff/(60.*60.)), "hour");
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else if (info.tm_min != relative_info.tm_min && fabs(second_diff) > 60.)
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return num_format(round(second_diff/(60.)), "minute");
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else {
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if (fabs(second_diff) < 1e-6)
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return num_format((long)(second_diff*1e9), "nanosecond");
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else if (fabs(second_diff) < 1e-3)
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return num_format((long)(second_diff*1e6), "microsecond");
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else if (fabs(second_diff) < 1.0)
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return num_format((long)(second_diff*1e3), "millisecond");
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else
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return num_format((long)(second_diff), "second");
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}
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}
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fail("Unreachable")
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func time(t:Time, seconds=no, am_pm=yes, timezone=Time.local_timezone() -> Text):
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time := if seconds and am_pm:
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t:format("%l:%M:%S%P")
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else if seconds and not am_pm:
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t:format("%T")
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else if not seconds and am_pm:
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t:format("%l:%M%P")
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else:
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t:format("%H:%M")
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return time:trim()
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func date(t:Time, timezone=Time.local_timezone() -> Text):
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return t:format("%F")
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func info(t:Time, timezone=Time.local_timezone() -> TimeInfo):
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return inline C : TimeInfo {
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struct tm info = {};
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WITH_TIMEZONE(_$timezone, localtime_r(&_$t.tv_sec, &info));
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(_$time$TimeInfo$$type){
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.year = I(info.tm_year + 1900),
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.month = I(info.tm_mon + 1),
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.day = I(info.tm_mday),
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.hour = I(info.tm_hour),
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.minute = I(info.tm_min),
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.second = I(info.tm_sec),
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.nanosecond = I(_$t.tv_usec),
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.weekday = (_$time$Weekday$$type){.$tag=info.tm_wday + 1},
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.day_of_year = I(info.tm_yday),
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.timezone = _$timezone,
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};
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}
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func after(t:Time, seconds=0.0, minutes=0.0, hours=0.0, days=0, weeks=0, months=0, years=0, timezone=Time.local_timezone() -> Time):
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return inline C : Time {
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double offset = _$seconds + 60.*_$minutes + 3600.*_$hours ;
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_$t.tv_sec += (time_t)offset;
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struct tm info = {};
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WITH_TIMEZONE(_$timezone, localtime_r(&_$t.tv_sec, &info));
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info.tm_mday += Int32$from_int(_$days, false) + 7*Int32$from_int(_$weeks, false);
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info.tm_mon += Int32$from_int(_$months, false);
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info.tm_year += Int32$from_int(_$years, false);
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time_t t = mktime(&info);
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(Time){
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.tv_sec=t,
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.tv_usec=_$t.tv_usec + (suseconds_t)(fmod(offset, 1.0) * 1e9),
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};
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}
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func parse(text:Text, format="%Y-%m-%dT%H:%M:%S%z", timezone=Time.local_timezone() -> Time?):
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return inline C : Time? {
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struct tm info = {.tm_isdst=-1};
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const char *str = Text$as_c_string(_$text);
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const char *fmt = Text$as_c_string(_$format);
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if (strstr(fmt, "%Z"))
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fail("The %Z specifier is not supported for time parsing!");
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char *invalid;
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WITH_TIMEZONE(_$timezone, invalid = strptime(str, fmt, &info));
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if (!invalid || invalid[0] != '\0')
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return (_$time$$OptionalTime$$type){.is_none=true};
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long offset = info.tm_gmtoff; // Need to cache this because mktime() mutates it to local tz >:(
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time_t t;
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WITH_TIMEZONE(_$timezone, t = mktime(&info));
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(_$time$$OptionalTime$$type){.value={.tv_sec=t + offset - info.tm_gmtoff}};
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}
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func _run_tests():
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>> Time.now():format()
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>> Time.set_local_timezone("Europe/Paris")
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>> Time.now():format()
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>> Time.set_local_timezone("America/New_York")
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>> Time.now():format()
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# >> Time.now():format(timezone="Europe/Paris")
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# >> Time.now():format()
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# >> Time.now():format("%Y-%m-%d")
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# >> Time.new(2023, 11, 5):format()
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# >> Time.local_timezone()
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# >> Time.new(2023, 11, 5):seconds_till(Time.now())
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# >> Time.new(2023, 11, 5):relative()
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# >> Time.now():info()
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# >> Time.now():time()
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# >> Time.now():date()
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# >> Time.parse("2023-11-05 01:01", "%Y-%m-%d %H:%M")
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# >> Time.parse("2023-11-05 01:01", "%Y-%m-%d %H:%M", timezone="Europe/Paris")
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func main():
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_run_tests()
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