// EachSunset returns the sunsets for a given latitude and longitude.
// lat is the latitude where north is positive and south is negative.
// lon is the longitude where east is positive and west is negative.
func EachSunset(lat, lon float64) tasks_recurring.R {
return tasks_recurring.RFunc(func(t time.Time) functional.Stream {
var s sunsetIterator
s.Around(lat, lon, t)
for !s.Sunset().After(t) {
s.AddDays(1)
}
return &s
})
}
// OnOrBefore ensures that the times in r happen on or before
// hour:min. If a time is after hour:min, it is moved earlier to be
// hour:min. If a time is 12 hours or more after hour:min, then it is
// considered to be before hour:min on the next day, and no adjustment is
// made.
func OnOrBefore(r tasks_recurring.R, hour, min int) tasks_recurring.R {
return tasks_recurring.RFunc(func(t time.Time) functional.Stream {
s := r.ForTime(t)
return functional.DropWhile(
functional.NewFilterer(func(ptr interface{}) error {
p := ptr.(*time.Time)
if p.After(t) {
return functional.Skipped
}
return nil
}),
&happensBefore{
Stream: s, hour: hour, min: min, hm: toHourMinute(hour, min)})
})
}