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annotate rust/hg-core/src/revlog/changelog.rs @ 48570:f2f57724d4eb

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rhg: Add RevlogEntry::data that does delta resolution This requires keeping a `&Revlog` reference inside the `RevlogEntry` struct. This struct already had the appropriate lifetime parameter. Differential Revision: https://phab.mercurial-scm.org/D11960
author Simon Sapin <simon.sapin@octobus.net>
date Tue, 21 Dec 2021 18:35:58 +0100
parents 20d0d896183e
children fb82b5cb8301
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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::node::NULL_NODE;
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4 use crate::revlog::revlog::{Revlog, RevlogError};
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5 use crate::revlog::Revision;
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6 use crate::revlog::{Node, NodePrefix};
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7
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8 /// A specialized `Revlog` to work with `changelog` data format.
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9 pub struct Changelog {
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10 /// The generic `revlog` format.
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11 pub(crate) revlog: Revlog,
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12 }
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13
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14 impl Changelog {
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15 /// Open the `changelog` of a repository given by its root.
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16 pub fn open(repo: &Repo) -> Result<Self, HgError> {
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17 let revlog = Revlog::open(repo, "00changelog.i", None)?;
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18 Ok(Self { revlog })
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19 }
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20
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21 /// Return the `ChangelogEntry` for the given node ID.
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22 pub fn data_for_node(
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23 &self,
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24 node: NodePrefix,
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25 ) -> Result<ChangelogRevisionData, RevlogError> {
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26 let rev = self.revlog.rev_from_node(node)?;
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27 self.data_for_rev(rev)
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28 }
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29
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30 /// Return the `ChangelogEntry` of the given revision number.
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31 pub fn data_for_rev(
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32 &self,
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33 rev: Revision,
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34 ) -> Result<ChangelogRevisionData, RevlogError> {
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35 let bytes = self.revlog.get_rev_data(rev)?.into_owned();
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36 Ok(ChangelogRevisionData { bytes })
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37 }
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38
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39 pub fn node_from_rev(&self, rev: Revision) -> Option<&Node> {
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40 self.revlog.node_from_rev(rev)
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41 }
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42 }
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43
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44 /// `Changelog` entry which knows how to interpret the `changelog` data bytes.
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45 #[derive(Debug)]
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46 pub struct ChangelogRevisionData {
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47 /// The data bytes of the `changelog` entry.
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48 bytes: Vec<u8>,
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49 }
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50
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51 impl ChangelogRevisionData {
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52 /// Return an iterator over the lines of the entry.
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53 pub fn lines(&self) -> impl Iterator<Item = &[u8]> {
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54 self.bytes
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55 .split(|b| b == &b'\n')
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56 .filter(|line| !line.is_empty())
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57 }
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58
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59 /// Return the node id of the `manifest` referenced by this `changelog`
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60 /// entry.
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61 pub fn manifest_node(&self) -> Result<Node, HgError> {
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62 match self.lines().next() {
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63 None => Ok(NULL_NODE),
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64 Some(x) => Node::from_hex_for_repo(x),
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65 }
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66 }
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67 }