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annotate rust/hg-core/src/operations/cat.rs @ 47964:796206e74b10

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rhg: Reuse manifest when checking status of multiple ambiguous files When `rhg status` cannot determine whether a file is clean based on mtime and size alone, it needs to compare its contents with those found in the parent commit. Previously, rhg would find the (same) manifest of that commit again for every such file. This is lifted out of the loop and reused. Differential Revision: https://phab.mercurial-scm.org/D11411
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 13 Sep 2021 18:09:10 +0200
parents 4d2a5ca060e3
children 87e3f878e65f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 // list_tracked_files.rs
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2 //
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3 // Copyright 2020 Antoine Cezar <antoine.cezar@octobus.net>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 use crate::repo::Repo;
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9 use crate::revlog::revlog::RevlogError;
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10 use crate::revlog::Node;
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11
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12 use crate::utils::hg_path::HgPathBuf;
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13
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14 pub struct CatOutput {
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15 /// Whether any file in the manifest matched the paths given as CLI
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16 /// arguments
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17 pub found_any: bool,
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18 /// The contents of matching files, in manifest order
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19 pub concatenated: Vec<u8>,
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20 /// Which of the CLI arguments did not match any manifest file
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21 pub missing: Vec<HgPathBuf>,
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22 /// The node ID that the given revset was resolved to
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23 pub node: Node,
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24 }
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25
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26 /// Output the given revision of files
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27 ///
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28 /// * `root`: Repository root
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29 /// * `rev`: The revision to cat the files from.
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30 /// * `files`: The files to output.
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31 pub fn cat<'a>(
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32 repo: &Repo,
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33 revset: &str,
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34 files: &'a [HgPathBuf],
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35 ) -> Result<CatOutput, RevlogError> {
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36 let rev = crate::revset::resolve_single(revset, repo)?;
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37 let manifest = repo.manifest_for_rev(rev)?;
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38 let node = *repo
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39 .changelog()?
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40 .node_from_rev(rev)
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41 .expect("should succeed when repo.manifest did");
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42 let mut bytes = vec![];
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43 let mut matched = vec![false; files.len()];
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44 let mut found_any = false;
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45
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46 for (manifest_file, node_bytes) in manifest.files_with_nodes() {
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47 for (cat_file, is_matched) in files.iter().zip(&mut matched) {
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48 if cat_file.as_bytes() == manifest_file.as_bytes() {
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49 *is_matched = true;
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50 found_any = true;
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51 let file_log = repo.filelog(manifest_file)?;
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52 let file_node = Node::from_hex_for_repo(node_bytes)?;
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53 let entry = file_log.get_node(file_node)?;
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54 bytes.extend(entry.data()?)
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55 }
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56 }
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57 }
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58
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59 let missing: Vec<_> = files
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60 .iter()
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61 .zip(&matched)
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62 .filter(|pair| !*pair.1)
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63 .map(|pair| pair.0.clone())
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64 .collect();
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65 Ok(CatOutput {
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66 found_any,
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67 concatenated: bytes,
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68 missing,
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69 node,
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70 })
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71 }