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