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use bstr::BString;
use crate::{time::Sign, Time};
/// Serialization with standard `git` format
impl Time {
/// Serialize this instance into memory, similar to what [`write_to()`][Self::write_to()] would do with arbitrary `Write` implementations.
pub fn to_bstring(&self) -> BString {
let mut buf = Vec::with_capacity(64);
self.write_to(&mut buf).expect("write to memory cannot fail");
buf.into()
}
/// Serialize this instance to `out` in a format suitable for use in header fields of serialized git commits or tags.
pub fn write_to(&self, mut out: impl std::io::Write) -> std::io::Result<()> {
let mut itoa = itoa::Buffer::new();
out.write_all(itoa.format(self.seconds_since_unix_epoch).as_bytes())?;
out.write_all(b" ")?;
out.write_all(match self.sign {
Sign::Plus => b"+",
Sign::Minus => b"-",
})?;
const ZERO: &[u8; 1] = b"0";
const SECONDS_PER_HOUR: i32 = 60 * 60;
let offset = self.offset_in_seconds.abs();
let hours = offset / SECONDS_PER_HOUR;
assert!(hours < 25, "offset is more than a day: {hours}");
let minutes = (offset - (hours * SECONDS_PER_HOUR)) / 60;
if hours < 10 {
out.write_all(ZERO)?;
}
out.write_all(itoa.format(hours).as_bytes())?;
if minutes < 10 {
out.write_all(ZERO)?;
}
out.write_all(itoa.format(minutes).as_bytes()).map(|_| ())
}
/// Computes the number of bytes necessary to render this time.
pub fn size(&self) -> usize {
// TODO: this is not year 2038 safe…but we also can't parse larger numbers (or represent them) anyway. It's a trap nonetheless
// that can be fixed by increasing the size to usize.
(if self.seconds_since_unix_epoch >= 1_000_000_000 {
10
} else if self.seconds_since_unix_epoch >= 100_000_000 {
9
} else if self.seconds_since_unix_epoch >= 10_000_000 {
8
} else if self.seconds_since_unix_epoch >= 1_000_000 {
7
} else if self.seconds_since_unix_epoch >= 100_000 {
6
} else if self.seconds_since_unix_epoch >= 10_000 {
5
} else if self.seconds_since_unix_epoch >= 1_000 {
4
} else if self.seconds_since_unix_epoch >= 100 {
3
} else if self.seconds_since_unix_epoch >= 10 {
2
} else {
1
}) + 2 /*space + sign*/ + 2 /*hours*/ + 2 /*minutes*/
}
}
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