mercurius/frontmatter/
readable.rs

1use chrono::NaiveDate;
2use serde::{self, Deserialize, Deserializer, Serialize, Serializer};
3use std::fmt;
4use std::ops::Sub;
5
6const READABLE_DATE_FORMAT: &'static str = "%b %-e, %Y";
7
8/// ReadableDate wraps a date and could be (de)serialize with format like
9/// `Apr 4, 2010`.
10#[derive(Debug, Clone, PartialEq, PartialOrd)]
11pub struct ReadableDate(NaiveDate);
12
13impl ReadableDate {
14    pub fn new(year: i32, month: u32, day: u32) -> Self {
15        Self(NaiveDate::from_ymd(year, month, day))
16    }
17
18    /// Create a `ReadableDate` for today.
19    pub fn today() -> Self {
20        Self(chrono::Local::today().naive_local())
21    }
22}
23
24impl Default for ReadableDate {
25    fn default() -> Self {
26        Self::today()
27    }
28}
29
30impl fmt::Display for ReadableDate {
31    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
32        write!(f, "{}", self.0)
33    }
34}
35
36impl Serialize for ReadableDate {
37    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
38        serializer.serialize_str(&format!("{}", self.0.format(READABLE_DATE_FORMAT)))
39    }
40}
41
42impl<'de> Deserialize<'de> for ReadableDate {
43    fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
44        let s = String::deserialize(deserializer)?;
45        Ok(Self(
46            NaiveDate::parse_from_str(&s, READABLE_DATE_FORMAT)
47                .map_err(serde::de::Error::custom)?,
48        ))
49    }
50}
51
52macro_rules! impl_sub {
53    ($for:ty, $rhs:ty) => {
54        impl Sub for $for {
55            type Output = chrono::Duration;
56
57            fn sub(self, other: $rhs) -> Self::Output {
58                self.0 - other.0
59            }
60        }
61    };
62}
63
64impl_sub! { ReadableDate, ReadableDate }
65impl_sub! { &ReadableDate, &ReadableDate }
66
67#[cfg(test)]
68mod test {
69    use super::*;
70
71    #[test]
72    fn date_sub() {
73        assert_eq!(
74            ReadableDate::new(2020, 02, 02) - ReadableDate::new(2020, 02, 01),
75            chrono::Duration::days(1)
76        );
77    }
78}
mercurius/frontmatter/readable.rs

mercurius/frontmatter/
readable.rs
