Mercurial > hg
annotate rust/hg-core/src/revlog/changelog.rs @ 45532:c2317b7624fd
hg-core: add `Changlog` a specialized `Revlog`
A facade to `Revlog` to provide a `changelog` specific interface.
Differential Revision: https://phab.mercurial-scm.org/D9010
author | Antoine Cezar <antoine.cezar@octobus.net> |
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date | Wed, 09 Sep 2020 16:25:23 +0200 |
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children | 7252f5237352 |
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45532
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hg-core: add `Changlog` a specialized `Revlog`
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1 use crate::revlog::revlog::{Revlog, RevlogError}; |
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2 use crate::revlog::Revision; |
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3 use std::path::PathBuf; |
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4 |
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5 /// A specialized `Revlog` to work with `changelog` data format. |
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6 pub struct Changelog { |
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7 /// The generic `revlog` format. |
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8 revlog: Revlog, |
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9 } |
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10 |
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11 impl Changelog { |
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12 /// Open the `changelog` of a repository given by its root. |
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13 pub fn open(root: &PathBuf) -> Result<Self, RevlogError> { |
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14 let index_file = root.join(".hg/store/00changelog.i"); |
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15 let revlog = Revlog::open(&index_file)?; |
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16 Ok(Self { revlog }) |
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17 } |
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18 |
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19 /// Return the `ChangelogEntry` a given node id. |
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20 pub fn get_node( |
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21 &self, |
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22 node: &[u8], |
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23 ) -> Result<ChangelogEntry, RevlogError> { |
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24 let rev = self.revlog.get_node_rev(node)?; |
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25 self.get_rev(rev) |
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26 } |
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27 |
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28 /// Return the `ChangelogEntry` of a given node revision. |
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29 pub fn get_rev( |
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30 &self, |
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31 rev: Revision, |
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32 ) -> Result<ChangelogEntry, RevlogError> { |
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33 let bytes = self.revlog.get_rev_data(rev)?; |
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34 Ok(ChangelogEntry { bytes }) |
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35 } |
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36 } |
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37 |
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38 /// `Changelog` entry which knows how to interpret the `changelog` data bytes. |
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39 #[derive(Debug)] |
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40 pub struct ChangelogEntry { |
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41 /// The data bytes of the `changelog` entry. |
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42 bytes: Vec<u8>, |
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43 } |
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44 |
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45 impl ChangelogEntry { |
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46 /// Return an iterator over the lines of the entry. |
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47 pub fn lines(&self) -> impl Iterator<Item = &[u8]> { |
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48 self.bytes |
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49 .split(|b| b == &b'\n') |
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50 .filter(|line| !line.is_empty()) |
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51 } |
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52 |
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53 /// Return the node id of the `manifest` referenced by this `changelog` |
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54 /// entry. |
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55 pub fn manifest_node(&self) -> Result<&[u8], RevlogError> { |
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56 self.lines().next().ok_or(RevlogError::Corrupted) |
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57 } |
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58 } |