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annotate rust/hg-core/src/revlog/changelog.rs @ 46135:cc6faec62cb7

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rust: change &PathBuf parameters to &Path This is just as useful in function bodies, and a less strict requirement for callers. Differential Revision: https://phab.mercurial-scm.org/D9594
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 14 Dec 2020 13:47:44 +0100
parents 88e741bf2d93
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 }