xpic 0.3.2

List and download Bing wallpapers.
Documentation 
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use chrono::{DateTime, NaiveDate, NaiveDateTime, Utc};
use serde::de::Visitor;
use serde::{self, Deserializer, Serializer};
use std::fmt::Formatter;

/// Serde format for `NaiveDate` as `YYYYMMDD`.
pub mod ymd {
    use super::*;

    const FORMAT: &str = "%Y%m%d";

    pub fn serialize<S>(date: &NaiveDate, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_str(&date.format(FORMAT).to_string())
    }

    pub fn deserialize<'de, D>(deserializer: D) -> Result<NaiveDate, D::Error>
    where
        D: Deserializer<'de>,
    {
        deserializer.deserialize_str(YMDVisitor)
    }

    struct YMDVisitor;

    impl Visitor<'_> for YMDVisitor {
        type Value = NaiveDate;

        fn expecting(&self, f: &mut Formatter) -> std::fmt::Result {
            write!(f, "a date string in YYYYMMDD format")
        }

        fn visit_str<E: serde::de::Error>(self, v: &str) -> Result<Self::Value, E> {
            NaiveDate::parse_from_str(v, FORMAT).map_err(E::custom)
        }
    }
}

/// Serde format for `DateTime<Utc>` as `YYYYMMDDHHmm`.
pub mod ymdhm {
    use super::*;

    const FORMAT: &str = "%Y%m%d%H%M";

    pub fn serialize<S>(dt: &DateTime<Utc>, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_str(&dt.format(FORMAT).to_string())
    }

    pub fn deserialize<'de, D>(deserializer: D) -> Result<DateTime<Utc>, D::Error>
    where
        D: Deserializer<'de>,
    {
        deserializer.deserialize_str(YMDHMVisitor)
    }

    struct YMDHMVisitor;

    impl Visitor<'_> for YMDHMVisitor {
        type Value = DateTime<Utc>;

        fn expecting(&self, f: &mut Formatter) -> std::fmt::Result {
            write!(f, "a datetime string in YYYYMMDDHHmm format")
        }

        fn visit_str<E: serde::de::Error>(self, v: &str) -> Result<Self::Value, E> {
            NaiveDateTime::parse_from_str(v, FORMAT)
                .map(|naive| naive.and_utc())
                .map_err(E::custom)
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use serde::{Deserialize, Serialize};

    #[derive(Debug, PartialEq, Serialize, Deserialize)]
    struct Date {
        #[serde(with = "ymd")]
        date: NaiveDate,
        #[serde(with = "ymdhm")]
        datetime: DateTime<Utc>,
    }

    #[test]
    fn test_round_trip() {
        let date = Date {
            date: NaiveDate::from_ymd_opt(2026, 2, 21).unwrap(),
            datetime: NaiveDateTime::parse_from_str("202602210800", "%Y%m%d%H%M")
                .unwrap()
                .and_utc(),
        };

        let json = serde_json::to_string(&date).unwrap();
        assert_eq!(json, r#"{"date":"20260221","datetime":"202602210800"}"#);

        let parsed: Date = serde_json::from_str(&json).unwrap();
        assert_eq!(parsed, date);
    }
}