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use chrono::NaiveDate;
use serde::{self, Deserialize, Deserializer, Serialize, Serializer};
use std::fmt;
use std::ops::Sub;
const READABLE_DATE_FORMAT: &'static str = "%b %-e, %Y";
#[derive(Debug, Clone, PartialEq, PartialOrd)]
pub struct ReadableDate(NaiveDate);
impl ReadableDate {
pub fn new(year: i32, month: u32, day: u32) -> Self {
Self(NaiveDate::from_ymd(year, month, day))
}
pub fn today() -> Self {
Self(chrono::Local::today().naive_local())
}
}
impl Default for ReadableDate {
fn default() -> Self {
Self::today()
}
}
impl fmt::Display for ReadableDate {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.0)
}
}
impl Serialize for ReadableDate {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
serializer.serialize_str(&format!("{}", self.0.format(READABLE_DATE_FORMAT)))
}
}
impl<'de> Deserialize<'de> for ReadableDate {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
let s = String::deserialize(deserializer)?;
Ok(Self(
NaiveDate::parse_from_str(&s, READABLE_DATE_FORMAT)
.map_err(serde::de::Error::custom)?,
))
}
}
macro_rules! impl_sub {
($for:ty, $rhs:ty) => {
impl Sub for $for {
type Output = chrono::Duration;
fn sub(self, other: $rhs) -> Self::Output {
self.0 - other.0
}
}
};
}
impl_sub! { ReadableDate, ReadableDate }
impl_sub! { &ReadableDate, &ReadableDate }
#[cfg(test)]
mod test {
use super::*;
#[test]
fn date_sub() {
assert_eq!(
ReadableDate::new(2020, 02, 02) - ReadableDate::new(2020, 02, 01),
chrono::Duration::days(1)
);
}
}