use git_hash::ObjectId;
use crate::{log::Line, store_impl::file::log::LineRef};
impl<'a> LineRef<'a> {
pub fn to_owned(&self) -> Line {
self.clone().into()
}
}
mod write {
use std::io;
use git_object::bstr::{BStr, ByteSlice};
use crate::log::Line;
#[derive(Debug, thiserror::Error)]
#[allow(missing_docs)]
enum Error {
#[error("Messages must not contain newlines\\n")]
IllegalCharacter,
}
impl From<Error> for io::Error {
fn from(err: Error) -> Self {
io::Error::new(io::ErrorKind::Other, err)
}
}
impl Line {
pub fn write_to(&self, mut out: impl io::Write) -> io::Result<()> {
write!(out, "{} {} ", self.previous_oid, self.new_oid)?;
self.signature.write_to(&mut out)?;
writeln!(out, "\t{}", check_newlines(self.message.as_ref())?)
}
}
fn check_newlines(input: &BStr) -> Result<&BStr, Error> {
if input.find_byte(b'\n').is_some() {
return Err(Error::IllegalCharacter);
}
Ok(input)
}
}
impl<'a> LineRef<'a> {
pub fn previous_oid(&self) -> ObjectId {
ObjectId::from_hex(self.previous_oid).expect("parse validation")
}
pub fn new_oid(&self) -> ObjectId {
ObjectId::from_hex(self.new_oid).expect("parse validation")
}
}
impl<'a> From<LineRef<'a>> for Line {
fn from(v: LineRef<'a>) -> Self {
Line {
previous_oid: v.previous_oid(),
new_oid: v.new_oid(),
signature: v.signature.into(),
message: v.message.into(),
}
}
}
pub mod decode {
use git_object::bstr::{BStr, ByteSlice};
use nom::{
bytes::complete::{tag, take_while},
combinator::opt,
error::{context, ContextError, ParseError},
sequence::{terminated, tuple},
IResult,
};
use crate::{file::log::LineRef, parse::hex_hash};
mod error {
use git_object::bstr::{BString, ByteSlice};
#[derive(Debug)]
pub struct Error {
pub input: BString,
}
impl std::fmt::Display for Error {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(
f,
"{:?} did not match '<old-hexsha> <new-hexsha> <name> <<email>> <timestamp> <tz>\\t<message>'",
self.input
)
}
}
impl std::error::Error for Error {}
impl Error {
pub(crate) fn new(input: &[u8]) -> Self {
Error {
input: input.as_bstr().to_owned(),
}
}
}
}
pub use error::Error;
impl<'a> LineRef<'a> {
pub fn from_bytes(input: &'a [u8]) -> Result<LineRef<'a>, Error> {
one::<()>(input).map(|(_, l)| l).map_err(|_| Error::new(input))
}
}
fn message<'a, E: ParseError<&'a [u8]>>(i: &'a [u8]) -> IResult<&'a [u8], &'a BStr, E> {
if i.is_empty() {
Ok((&[], i.as_bstr()))
} else {
terminated(take_while(|c| c != b'\n'), opt(tag(b"\n")))(i).map(|(i, o)| (i, o.as_bstr()))
}
}
fn one<'a, E: ParseError<&'a [u8]> + ContextError<&'a [u8]>>(bytes: &'a [u8]) -> IResult<&[u8], LineRef<'a>, E> {
let (i, (old, new, signature, message_sep, message)) = context(
"<old-hexsha> <new-hexsha> <name> <<email>> <timestamp> <tz>\\t<message>",
tuple((
context("<old-hexsha>", terminated(hex_hash, tag(b" "))),
context("<new-hexsha>", terminated(hex_hash, tag(b" "))),
context("<name> <<email>> <timestamp>", git_actor::signature::decode),
opt(tag(b"\t")),
context("<optional message>", message),
)),
)(bytes)?;
if message_sep.is_none() {
if let Some(first) = message.first() {
if !first.is_ascii_whitespace() {
return Err(nom::Err::Error(E::add_context(
i,
"log message must be separated from signature with whitespace",
E::from_error_kind(i, nom::error::ErrorKind::MapRes),
)));
}
}
}
Ok((
i,
LineRef {
previous_oid: old,
new_oid: new,
signature,
message,
},
))
}
#[cfg(test)]
mod test {
use git_actor::{Sign, Time};
use git_object::bstr::ByteSlice;
use super::*;
fn hex_to_oid(hex: &str) -> git_hash::ObjectId {
git_hash::ObjectId::from_hex(hex.as_bytes()).expect("40 bytes hex")
}
fn with_newline(mut v: Vec<u8>) -> Vec<u8> {
v.push(b'\n');
v
}
mod invalid {
use git_testtools::to_bstr_err;
use nom::error::VerboseError;
use super::one;
#[test]
fn completely_bogus_shows_error_with_context() {
let err = one::<VerboseError<&[u8]>>(b"definitely not a log entry")
.map_err(to_bstr_err)
.expect_err("this should fail");
assert!(err.to_string().contains("<old-hexsha> <new-hexsha>"));
}
#[test]
fn missing_whitespace_between_signature_and_message() {
let line = "0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 one <foo@example.com> 1234567890 -0000message";
let err = one::<VerboseError<&[u8]>>(line.as_bytes())
.map_err(to_bstr_err)
.expect_err("this should fail");
assert!(err
.to_string()
.contains("log message must be separated from signature with whitespace"));
}
}
const NULL_SHA1: &[u8] = b"0000000000000000000000000000000000000000";
#[test]
fn entry_with_empty_message() {
let line_without_nl: Vec<_> = b"0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 name <foo@example.com> 1234567890 -0000".to_vec();
let line_with_nl = with_newline(line_without_nl.clone());
for input in &[line_without_nl, line_with_nl] {
assert_eq!(
one::<nom::error::Error<_>>(input).expect("successful parsing").1,
LineRef {
previous_oid: NULL_SHA1.as_bstr(),
new_oid: NULL_SHA1.as_bstr(),
signature: git_actor::SignatureRef {
name: b"name".as_bstr(),
email: b"foo@example.com".as_bstr(),
time: Time {
seconds_since_unix_epoch: 1234567890,
offset_in_seconds: 0,
sign: Sign::Minus
}
},
message: b"".as_bstr(),
}
);
}
}
#[test]
fn entry_with_message_without_newline_and_with_newline() {
let line_without_nl: Vec<_> = b"a5828ae6b52137b913b978e16cd2334482eb4c1f 89b43f80a514aee58b662ad606e6352e03eaeee4 Sebastian Thiel <foo@example.com> 1618030561 +0800\tpull --ff-only: Fast-forward".to_vec();
let line_with_nl = with_newline(line_without_nl.clone());
for input in &[line_without_nl, line_with_nl] {
let (remaining, res) = one::<nom::error::Error<_>>(input).expect("successful parsing");
assert!(remaining.is_empty(), "all consuming even without trailing newline");
let actual = LineRef {
previous_oid: b"a5828ae6b52137b913b978e16cd2334482eb4c1f".as_bstr(),
new_oid: b"89b43f80a514aee58b662ad606e6352e03eaeee4".as_bstr(),
signature: git_actor::SignatureRef {
name: b"Sebastian Thiel".as_bstr(),
email: b"foo@example.com".as_bstr(),
time: Time {
seconds_since_unix_epoch: 1618030561,
offset_in_seconds: 28800,
sign: Sign::Plus,
},
},
message: b"pull --ff-only: Fast-forward".as_bstr(),
};
assert_eq!(res, actual);
assert_eq!(
actual.previous_oid(),
hex_to_oid("a5828ae6b52137b913b978e16cd2334482eb4c1f")
);
assert_eq!(actual.new_oid(), hex_to_oid("89b43f80a514aee58b662ad606e6352e03eaeee4"));
}
}
#[test]
fn two_lines_in_a_row_with_and_without_newline() {
let lines = b"0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 one <foo@example.com> 1234567890 -0000\t\n0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 two <foo@example.com> 1234567890 -0000\thello";
let (remainder, parsed) = one::<nom::error::Error<_>>(lines).expect("parse single line");
assert_eq!(parsed.message, b"".as_bstr(), "first message is empty");
let (remainder, parsed) = one::<nom::error::Error<_>>(remainder).expect("parse single line");
assert_eq!(
parsed.message,
b"hello".as_bstr(),
"second message is not and contains no newline"
);
assert!(remainder.is_empty());
}
}
}