Mercurial > hg
view rust/hg-core/src/revlog/changelog.rs @ 46428:5893706af3de
rust: Simplify error type for reading hex node IDs
If a string is not valid hexadecimal it’s not that useful to track the precise reason.
Differential Revision: https://phab.mercurial-scm.org/D9861
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 25 Jan 2021 12:28:39 +0100 |
parents | 8a4914397d02 |
children | 645ee7225fab |
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use crate::repo::Repo; use crate::revlog::revlog::{Revlog, RevlogError}; use crate::revlog::NodePrefixRef; use crate::revlog::Revision; /// 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(repo: &Repo) -> Result<Self, RevlogError> { let revlog = Revlog::open(repo, "00changelog.i", None)?; Ok(Self { revlog }) } /// Return the `ChangelogEntry` a given node id. pub fn get_node( &self, node: NodePrefixRef, ) -> 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) } }