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annotate rust/hg-core/src/revlog/manifest.rs @ 47963:001d747c2baf

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rust: Return HgError instead of RevlogError in revlog constructors This leaves fewer cases for callers to handle, as RevlogError is more general Differential Revision: https://phab.mercurial-scm.org/D11410
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 13 Sep 2021 18:02:45 +0200
parents d44740725b95
children 796206e74b10
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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001d747c2baf rust: Return HgError instead of RevlogError in revlog constructors
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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 use crate::utils::hg_path::HgPath;
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7
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8 /// A specialized `Revlog` to work with `manifest` data format.
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9 pub struct Manifestlog {
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10 /// The generic `revlog` format.
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11 revlog: Revlog,
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12 }
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13
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14 impl Manifestlog {
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15 /// Open the `manifest` 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, "00manifest.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 `ManifestEntry` of a given node id.
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22 pub fn get_node(&self, node: NodePrefix) -> Result<Manifest, RevlogError> {
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23 let rev = self.revlog.get_node_rev(node)?;
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24 self.get_rev(rev)
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25 }
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26
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27 /// Return the `ManifestEntry` of a given node revision.
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28 pub fn get_rev(&self, rev: Revision) -> Result<Manifest, RevlogError> {
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29 let bytes = self.revlog.get_rev_data(rev)?;
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30 Ok(Manifest { bytes })
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31 }
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32 }
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33
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34 /// `Manifestlog` entry which knows how to interpret the `manifest` data bytes.
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35 #[derive(Debug)]
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36 pub struct Manifest {
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37 bytes: Vec<u8>,
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38 }
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39
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40 impl Manifest {
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41 /// Return an iterator over the lines of the entry.
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42 pub fn lines(&self) -> impl Iterator<Item = &[u8]> {
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43 self.bytes
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44 .split(|b| b == &b'\n')
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45 .filter(|line| !line.is_empty())
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46 }
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47
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48 /// Return an iterator over the files of the entry.
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49 pub fn files(&self) -> impl Iterator<Item = &HgPath> {
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50 self.lines().filter(|line| !line.is_empty()).map(|line| {
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51 let pos = line
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52 .iter()
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53 .position(|x| x == &b'\0')
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54 .expect("manifest line should contain \\0");
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55 HgPath::new(&line[..pos])
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56 })
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57 }
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58
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59 /// Return an iterator over the files of the entry.
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60 pub fn files_with_nodes(&self) -> impl Iterator<Item = (&HgPath, &[u8])> {
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61 self.lines().filter(|line| !line.is_empty()).map(|line| {
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62 let pos = line
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63 .iter()
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64 .position(|x| x == &b'\0')
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65 .expect("manifest line should contain \\0");
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66 let hash_start = pos + 1;
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67 let hash_end = hash_start + 40;
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68 (HgPath::new(&line[..pos]), &line[hash_start..hash_end])
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69 })
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70 }
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71 }