changelog.rs
58 lines
| 1.7 KiB
| application/rls-services+xml
|
RustLexer
|
r46103 | use crate::revlog::revlog::{Revlog, RevlogError}; | ||
use crate::revlog::Revision; | ||||
use std::path::PathBuf; | ||||
/// A specialized `Revlog` to work with `changelog` data format. | ||||
pub struct Changelog { | ||||
/// The generic `revlog` format. | ||||
revlog: Revlog, | ||||
} | ||||
impl Changelog { | ||||
/// Open the `changelog` of a repository given by its root. | ||||
pub fn open(root: &PathBuf) -> Result<Self, RevlogError> { | ||||
let index_file = root.join(".hg/store/00changelog.i"); | ||||
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r46397 | let revlog = Revlog::open(&index_file, None)?; | ||
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r46103 | Ok(Self { revlog }) | ||
} | ||||
/// Return the `ChangelogEntry` a given node id. | ||||
pub fn get_node( | ||||
&self, | ||||
node: &[u8], | ||||
) -> Result<ChangelogEntry, RevlogError> { | ||||
let rev = self.revlog.get_node_rev(node)?; | ||||
self.get_rev(rev) | ||||
} | ||||
/// Return the `ChangelogEntry` of a given node revision. | ||||
pub fn get_rev( | ||||
&self, | ||||
rev: Revision, | ||||
) -> Result<ChangelogEntry, RevlogError> { | ||||
let bytes = self.revlog.get_rev_data(rev)?; | ||||
Ok(ChangelogEntry { bytes }) | ||||
} | ||||
} | ||||
/// `Changelog` entry which knows how to interpret the `changelog` data bytes. | ||||
#[derive(Debug)] | ||||
pub struct ChangelogEntry { | ||||
/// The data bytes of the `changelog` entry. | ||||
bytes: Vec<u8>, | ||||
} | ||||
impl ChangelogEntry { | ||||
/// Return an iterator over the lines of the entry. | ||||
pub fn lines(&self) -> impl Iterator<Item = &[u8]> { | ||||
self.bytes | ||||
.split(|b| b == &b'\n') | ||||
.filter(|line| !line.is_empty()) | ||||
} | ||||
/// Return the node id of the `manifest` referenced by this `changelog` | ||||
/// entry. | ||||
pub fn manifest_node(&self) -> Result<&[u8], RevlogError> { | ||||
self.lines().next().ok_or(RevlogError::Corrupted) | ||||
} | ||||
} | ||||