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annotate rust/hg-core/src/revlog/changelog.rs @ 46617:a34cd9aa3323

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copies-rust: yield both p1 and p2 copies in `ChangedFiles.actions()` Instead of filtering the relevant parent inside de ChangedFiles method, we now yield all copies information and let the caller do the filtering. Soon, the filtering will be replaced by dispatching. Differential Revision: https://phab.mercurial-scm.org/D9649
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 21 Dec 2020 10:24:16 +0100
parents 43d63979a75e
children b1f2c2b336ec
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1 use crate::errors::HgError;
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2 use crate::repo::Repo;
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3 use crate::revlog::revlog::{Revlog, RevlogError};
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4 use crate::revlog::NodePrefix;
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5 use crate::revlog::Revision;
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6
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7 /// A specialized `Revlog` to work with `changelog` data format.
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8 pub struct Changelog {
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9 /// The generic `revlog` format.
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10 pub(crate) revlog: Revlog,
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11 }
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12
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13 impl Changelog {
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14 /// Open the `changelog` of a repository given by its root.
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15 pub fn open(repo: &Repo) -> Result<Self, RevlogError> {
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16 let revlog = Revlog::open(repo, "00changelog.i", 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: NodePrefix,
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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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28
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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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38
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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()
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58 .next()
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59 .ok_or_else(|| HgError::corrupted("empty changelog entry").into())
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60 }
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61 }