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use gix_object::bstr::{BStr, ByteSlice};
use nom::{
branch::alt,
bytes::complete::{tag, take_while_m_n},
error::ParseError,
IResult,
};
fn is_hex_digit_lc(b: u8) -> bool {
matches!(b, b'0'..=b'9' | b'a'..=b'f')
}
/// Copy from https://github.com/Byron/gitoxide/blob/f270850ff92eab15258023b8e59346ec200303bd/gix-object/src/immutable/parse.rs#L64
pub fn hex_hash<'a, E: ParseError<&'a [u8]>>(i: &'a [u8]) -> IResult<&'a [u8], &'a BStr, E> {
// NOTE: It's important to be able to read all hashes, do not parameterize it. Hashes can be rejected at a later stage
// if needed.
take_while_m_n(
gix_hash::Kind::shortest().len_in_hex(),
gix_hash::Kind::longest().len_in_hex(),
is_hex_digit_lc,
)(i)
.map(|(i, hex)| (i, hex.as_bstr()))
}
pub fn newline<'a, E: ParseError<&'a [u8]>>(i: &'a [u8]) -> IResult<&'a [u8], &'a [u8], E> {
alt((tag(b"\r\n"), tag(b"\n")))(i)
}
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