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annotate rust/hg-core/src/revlog/changelog.rs @ 46152:e166e8a035a7

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copies-rust: use the entry API to overwrite deleted entry This is more efficient, more idiomatic and more compact. The main motivation for this change is to cleanup that area before start to do "overwrite" tracking. Such tracking will ultimately help to avoid costly is_ancestors call when merging changeset. Differential Revision: https://phab.mercurial-scm.org/D9494
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Wed, 02 Dec 2020 10:51:40 +0100
parents cc6faec62cb7
children 8a4914397d02
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1 use crate::revlog::revlog::{Revlog, RevlogError};
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2 use crate::revlog::NodePrefixRef;
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3 use crate::revlog::Revision;
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4 use std::path::Path;
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5
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6 /// A specialized `Revlog` to work with `changelog` data format.
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7 pub struct Changelog {
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8 /// The generic `revlog` format.
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9 revlog: Revlog,
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10 }
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11
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12 impl Changelog {
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13 /// Open the `changelog` of a repository given by its root.
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14 pub fn open(root: &Path) -> Result<Self, RevlogError> {
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15 let index_file = root.join(".hg/store/00changelog.i");
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16 let revlog = Revlog::open(&index_file, None)?;
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17 Ok(Self { revlog })
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18 }
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19
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20 /// Return the `ChangelogEntry` a given node id.
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21 pub fn get_node(
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22 &self,
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23 node: NodePrefixRef,
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24 ) -> Result<ChangelogEntry, RevlogError> {
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25 let rev = self.revlog.get_node_rev(node)?;
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26 self.get_rev(rev)
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27 }
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29 /// Return the `ChangelogEntry` of a given node revision.
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30 pub fn get_rev(
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31 &self,
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32 rev: Revision,
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33 ) -> Result<ChangelogEntry, RevlogError> {
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34 let bytes = self.revlog.get_rev_data(rev)?;
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35 Ok(ChangelogEntry { bytes })
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36 }
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37 }
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39 /// `Changelog` entry which knows how to interpret the `changelog` data bytes.
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40 #[derive(Debug)]
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41 pub struct ChangelogEntry {
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42 /// The data bytes of the `changelog` entry.
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43 bytes: Vec<u8>,
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44 }
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45
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46 impl ChangelogEntry {
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47 /// Return an iterator over the lines of the entry.
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48 pub fn lines(&self) -> impl Iterator<Item = &[u8]> {
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49 self.bytes
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50 .split(|b| b == &b'\n')
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51 .filter(|line| !line.is_empty())
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52 }
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53
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54 /// Return the node id of the `manifest` referenced by this `changelog`
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55 /// entry.
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56 pub fn manifest_node(&self) -> Result<&[u8], RevlogError> {
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57 self.lines().next().ok_or(RevlogError::Corrupted)
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58 }
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59 }