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annotate rust/hg-core/src/revlog/manifest.rs @ 45533:89ac95bd4993

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hg-core: add `Manifest` a specialized `Revlog` A facade to `Revlog` to provide a `manifest` specific interface. Differential Revision: https://phab.mercurial-scm.org/D9011
author Antoine Cezar <antoine.cezar@octobus.net>
date Wed, 09 Sep 2020 14:50:58 +0200
parents
children f2de24c2b1f6
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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 crate::utils::hg_path::HgPath;
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4 use std::path::PathBuf;
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5
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6 /// A specialized `Revlog` to work with `manifest` data format.
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7 pub struct Manifest {
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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 Manifest {
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13 /// Open the `manifest` of a repository given by its root.
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14 pub fn open(root: &PathBuf) -> Result<Self, RevlogError> {
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15 let index_file = root.join(".hg/store/00manifest.i");
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16 let revlog = Revlog::open(&index_file)?;
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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 `ManifestEntry` of a given node id.
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21 pub fn get_node(&self, node: &[u8]) -> Result<ManifestEntry, RevlogError> {
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22 let rev = self.revlog.get_node_rev(node)?;
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23 self.get_rev(rev)
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24 }
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25
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26 /// Return the `ManifestEntry` of a given node revision.
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27 pub fn get_rev(
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28 &self,
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29 rev: Revision,
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30 ) -> Result<ManifestEntry, RevlogError> {
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31 let bytes = self.revlog.get_rev_data(rev)?;
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32 Ok(ManifestEntry { bytes })
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33 }
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34 }
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35
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36 /// `Manifest` entry which knows how to interpret the `manifest` data bytes.
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37 #[derive(Debug)]
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38 pub struct ManifestEntry {
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39 bytes: Vec<u8>,
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40 }
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41
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42 impl ManifestEntry {
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43 /// Return an iterator over the lines of the entry.
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44 pub fn lines(&self) -> impl Iterator<Item = &[u8]> {
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45 self.bytes
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46 .split(|b| b == &b'\n')
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47 .filter(|line| !line.is_empty())
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48 }
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49
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50 /// Return an iterator over the files of the entry.
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51 pub fn files(&self) -> impl Iterator<Item = &HgPath> {
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52 self.lines().filter(|line| !line.is_empty()).map(|line| {
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53 let pos = line
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54 .iter()
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55 .position(|x| x == &b'\0')
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56 .expect("manifest line should contain \\0");
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57 HgPath::new(&line[..pos])
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58 })
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59 }
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60 }