72 lines
2.5 KiB
Plaintext
72 lines
2.5 KiB
Plaintext
extern crate chrono;
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use chrono::NaiveDate;
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use std::str::FromStr;
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fn main() {
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let date = std::env::args().nth(1).expect("Please provide a YYYY-MM-DD date.");
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println!("{} is {}", date, NaiveDate::from_str(&date).unwrap().to_poee());
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}
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// The necessary constants for the seasons, weekdays, and holydays.
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const APOSTLES: [&str; 5] = ["Mungday", "Mojoday", "Syaday", "Zaraday", "Maladay"];
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const HOLYDAYS: [&str; 5] = ["Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"];
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const SEASONS: [&str; 5] = ["Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"];
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const WEEKDAYS: [&str; 5] = ["Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"];
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// The necessary constants for the conversion.
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const APOSTLE_HOLYDAY: usize = 5;
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const CURSE_OF_GREYFACE: i32 = 1166;
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const SEASON_DAYS: usize = 73;
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const SEASON_HOLYDAY: usize = 50;
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const ST_TIBS_DAY: usize = 59;
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const WEEK_DAYS: usize = 5;
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// This extends the `Datelike` trait of Rust's Chrono crate with a method that
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// prints any Datelike type as a String.
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impl<T: Datelike> DiscordianDate for T {}
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pub trait DiscordianDate: Datelike {
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fn to_poee(&self) -> String {
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let day = self.ordinal0() as usize;
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let leap = self.year() % 4 == 0 && self.year() % 100 != 0 || self.year() % 400 == 0;
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let year = self.year() + CURSE_OF_GREYFACE;
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if leap && day == ST_TIBS_DAY { return format!("St. Tib's Day, in the YOLD {}", year); }
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let day_offset = if leap && day > ST_TIBS_DAY { day - 1 } else { day };
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let day_of_season = day_offset % SEASON_DAYS + 1;
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let season = SEASONS[day_offset / SEASON_DAYS];
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let weekday = WEEKDAYS[day_offset % WEEK_DAYS];
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let holiday = if day_of_season == APOSTLE_HOLYDAY {
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format!("\nCelebrate {}", APOSTLES[day_offset / SEASON_DAYS])
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} else if day_of_season == SEASON_HOLYDAY {
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format!("\nCelebrate {}", HOLYDAYS[day_offset / SEASON_DAYS])
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} else {
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String::with_capacity(0)
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};
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format!("{}, the {} day of {} in the YOLD {}{}",
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weekday, ordinalize(day_of_season), season, year, holiday)
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}
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}
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/// A helper function to ordinalize a numeral.
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fn ordinalize(num: usize) -> String {
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let s = format!("{}", num);
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let suffix = if s.ends_with('1') && !s.ends_with("11") {
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"st"
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} else if s.ends_with('2') && !s.ends_with("12") {
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"nd"
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} else if s.ends_with('3') && !s.ends_with("13") {
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"rd"
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} else {
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"th"
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};
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format!("{}{}", s, suffix)
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}
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