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use chrono::{DateTime, Datelike, Duration, Local, Weekday}; use serde::{Deserialize, Serialize}; pub static REMINDER_EXAMPLES: &str = r###" # This reminder will disappear once executed. - name: Test reminder once on 10 July 2020, at 8 am IST when: "2020-07-10T08:00:00+05:30" repeat: Never # The following reminders will reschedule themselves. - name: "Test reminder everyday at 10:30 pm IST" when: "2020-07-10T10:30:00+05:30" repeat: EveryDay - name: "Test reminder every other day at 10:30 pm IST" when: "2020-07-10T10:30:00+05:30" repeat: EveryNthDay: 2 - name: Test reminder every week at 11 am IST when: "2020-07-10T11:00:00+05:30" repeat: EveryWeek - name: Test reminder every 3rd week at 11 am IST when: "2020-07-10T11:00:00+05:30" repeat: EveryNthWeek: 3 - name: "Test reminder every saturday and sunday at 9:15 am IST" when: "2020-07-10T09:15:00+05:30" repeat: Weekdays: - Sat - Sun - name: "Test reminder every 2nd saturday at 9:15 am IST" when: "2020-07-10T09:15:00+05:30" repeat: EveryNthWeekday: n: 2 weekday: Sat "###; #[derive(Serialize, Deserialize, Copy, Clone)] pub struct NthWeekday { n: u32, weekday: Weekday, } impl NthWeekday { pub fn from(n: u32, weekday: Weekday) -> Self { Self { n, weekday } } pub fn n(&self) -> u32 { self.n } pub fn weekday(&self) -> Weekday { self.weekday } } #[derive(Serialize, Deserialize, Clone)] pub enum Repeat { Never, EveryDay, EveryNthDay(u32), EveryWeek, EveryNthWeek(u32), Weekly(Vec<Weekday>), Weekdays(Vec<Weekday>), EveryNthWeekday(NthWeekday), } impl Repeat { pub fn when_next(&self, when_last: DateTime<Local>) -> Option<DateTime<Local>> { match self { Self::Never => None, Self::EveryDay => Some(when_last + Duration::days(1)), Self::EveryNthDay(days) => Some(when_last + Duration::days(*days as i64)), Self::EveryWeek => Some(when_last + Duration::days(7)), Self::EveryNthWeek(weeks) => Some(when_last + Duration::days((weeks * 7).into())), Self::Weekdays(weekdays) | Self::Weekly(weekdays) => { let mut weekday = when_last.weekday().succ(); let mut days = 1; while !weekdays.contains(&weekday) { weekday = weekday.succ(); days += 1; } Some(when_last + Duration::days(days)) } Self::EveryNthWeekday(nthweekday) => { let mut weekday = when_last.weekday().succ(); let mut days = 1; while weekday != nthweekday.weekday() { weekday = weekday.succ(); days += 1; } Some(when_last + Duration::days((days + 7 * nthweekday.n()).into())) } } } } #[derive(Serialize, Deserialize, Clone)] pub struct Reminder { name: String, when: DateTime<Local>, repeat: Repeat, } impl Reminder { pub fn new(name: String, when: DateTime<Local>, repeat: Repeat) -> Self { Self { name, when, repeat } } pub fn name(&self) -> &String { &self.name } pub fn when(&self) -> &DateTime<Local> { &self.when } pub fn repeat(&self) -> &Repeat { &self.repeat } pub fn examples() -> Vec<Reminder> { let reminders: Vec<Reminder> = serde_yaml::from_str(REMINDER_EXAMPLES).expect("invalid reminders template"); reminders } pub fn next(&self) -> Option<Self> { self.repeat .when_next(self.when.clone()) .map(|when| Self::new(self.name.clone(), when, self.repeat.clone())) } }