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annotate rust/hg-core/src/operations/cat.rs @ 49175:34decbaf4da3

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node: manually implement Debug I got too irritated today with the default Debug implementation of hg::revlog::Node while playing with a new parser. This isn't quite what I wanted, but it wasn't much code and it at least gives you output that's easy to visually compare to a node.hex()ed identifier from the Python side of things. Sadly, this doesn't influence the output in lldb or the VSCode debugger extension that uses lldb under the covers, but it at least means debug prints are a little more useful. Differential Revision: https://phab.mercurial-scm.org/D12608
author Augie Fackler <augie@google.com>
date Thu, 05 May 2022 14:47:26 -0400
parents 20d0d896183e
children 49131579db62
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::HgPath;
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13
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14 use crate::errors::HgError;
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15 use crate::manifest::Manifest;
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16 use crate::manifest::ManifestEntry;
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17 use itertools::put_back;
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18 use itertools::PutBack;
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19 use std::cmp::Ordering;
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20
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21 pub struct CatOutput<'a> {
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22 /// Whether any file in the manifest matched the paths given as CLI
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23 /// arguments
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24 pub found_any: bool,
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25 /// The contents of matching files, in manifest order
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26 pub results: Vec<(&'a HgPath, Vec<u8>)>,
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27 /// Which of the CLI arguments did not match any manifest file
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28 pub missing: Vec<&'a HgPath>,
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29 /// The node ID that the given revset was resolved to
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30 pub node: Node,
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31 }
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32
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33 // Find an item in an iterator over a sorted collection.
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34 fn find_item<'a>(
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35 i: &mut PutBack<impl Iterator<Item = Result<ManifestEntry<'a>, HgError>>>,
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36 needle: &HgPath,
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37 ) -> Result<Option<Node>, HgError> {
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38 loop {
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39 match i.next() {
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40 None => return Ok(None),
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41 Some(result) => {
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42 let entry = result?;
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43 match needle.as_bytes().cmp(entry.path.as_bytes()) {
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44 Ordering::Less => {
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45 i.put_back(Ok(entry));
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46 return Ok(None);
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47 }
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48 Ordering::Greater => continue,
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49 Ordering::Equal => return Ok(Some(entry.node_id()?)),
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50 }
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51 }
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52 }
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53 }
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54 }
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55
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56 fn find_files_in_manifest<'query>(
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57 manifest: &Manifest,
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58 query: impl Iterator<Item = &'query HgPath>,
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59 ) -> Result<(Vec<(&'query HgPath, Node)>, Vec<&'query HgPath>), HgError> {
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60 let mut manifest = put_back(manifest.iter());
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61 let mut res = vec![];
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62 let mut missing = vec![];
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63
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64 for file in query {
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65 match find_item(&mut manifest, file)? {
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66 None => missing.push(file),
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67 Some(item) => res.push((file, item)),
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68 }
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69 }
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70 return Ok((res, missing));
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71 }
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72
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73 /// Output the given revision of files
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74 ///
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75 /// * `root`: Repository root
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76 /// * `rev`: The revision to cat the files from.
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77 /// * `files`: The files to output.
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78 pub fn cat<'a>(
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79 repo: &Repo,
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80 revset: &str,
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81 mut files: Vec<&'a HgPath>,
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82 ) -> Result<CatOutput<'a>, RevlogError> {
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83 let rev = crate::revset::resolve_single(revset, repo)?;
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84 let manifest = repo.manifest_for_rev(rev)?;
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85 let node = *repo
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86 .changelog()?
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87 .node_from_rev(rev)
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88 .expect("should succeed when repo.manifest did");
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89 let mut results: Vec<(&'a HgPath, Vec<u8>)> = vec![];
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90 let mut found_any = false;
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91
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92 files.sort_unstable();
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93
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94 let (found, missing) = find_files_in_manifest(
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95 &manifest,
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96 files.into_iter().map(|f| f.as_ref()),
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97 )?;
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98
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99 for (file_path, file_node) in found {
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100 found_any = true;
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101 let file_log = repo.filelog(file_path)?;
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102 results.push((
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103 file_path,
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104 file_log.data_for_node(file_node)?.into_file_data()?,
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105 ));
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106 }
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107
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108 Ok(CatOutput {
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109 found_any,
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110 results,
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111 missing,
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112 node,
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113 })
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114 }