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annotate rust/hg-core/src/revlog/changelog.rs @ 47112:d5956136d19d

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dirstate-tree: Give to `status()` mutable access to the `DirstateMap` Differential Revision: https://phab.mercurial-scm.org/D10546
author Simon Sapin <simon.sapin@octobus.net>
date Fri, 16 Apr 2021 12:12:04 +0200
parents b1f2c2b336ec
children 001d747c2baf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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::Revision;
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5 use crate::revlog::{Node, NodePrefix};
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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 pub fn node_from_rev(&self, rev: Revision) -> Option<&Node> {
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39 Some(self.revlog.index.get_entry(rev)?.hash())
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40 }
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41 }
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42
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43 /// `Changelog` entry which knows how to interpret the `changelog` data bytes.
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44 #[derive(Debug)]
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45 pub struct ChangelogEntry {
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46 /// The data bytes of the `changelog` entry.
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47 bytes: Vec<u8>,
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48 }
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49
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50 impl ChangelogEntry {
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51 /// Return an iterator over the lines of the entry.
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52 pub fn lines(&self) -> impl Iterator<Item = &[u8]> {
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53 self.bytes
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54 .split(|b| b == &b'\n')
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55 .filter(|line| !line.is_empty())
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56 }
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57
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58 /// Return the node id of the `manifest` referenced by this `changelog`
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59 /// entry.
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60 pub fn manifest_node(&self) -> Result<&[u8], RevlogError> {
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61 self.lines()
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62 .next()
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63 .ok_or_else(|| HgError::corrupted("empty changelog entry").into())
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64 }
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65 }