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annotate rust/hg-core/src/operations/cat.rs @ 46135:dca9cb99971c

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rust: replace most "operation" structs with functions The hg-core crate has a partially-formed concept of "operation", represented as structs with constructors and a `run` method. Each struct?s contructor takes different parameters, and each `run` has a different return type. Constructors typically don?t do much more than store parameters for `run` to access them. There was a comment about adding an `Operation` trait when the language supports expressing something so general, but it?s hard to imagine how operations with such different APIs could be used in a generic context. This commit starts removing the concept of "operation", since those are pretty much just functions. Differential Revision: https://phab.mercurial-scm.org/D9595
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 14 Dec 2020 14:59:23 +0100
parents cc6faec62cb7
children 8a4914397d02
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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 std::convert::From;
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9 use std::path::{Path, PathBuf};
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10
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11 use crate::revlog::changelog::Changelog;
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12 use crate::revlog::manifest::Manifest;
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13 use crate::revlog::path_encode::path_encode;
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14 use crate::revlog::revlog::Revlog;
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15 use crate::revlog::revlog::RevlogError;
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16 use crate::revlog::Node;
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17 use crate::revlog::NodePrefix;
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18 use crate::revlog::Revision;
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19 use crate::utils::files::get_path_from_bytes;
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20 use crate::utils::hg_path::{HgPath, HgPathBuf};
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21
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22 const METADATA_DELIMITER: [u8; 2] = [b'\x01', b'\n'];
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23
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24 /// Kind of error encountered by `CatRev`
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25 #[derive(Debug)]
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26 pub enum CatRevErrorKind {
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27 /// Error when reading a `revlog` file.
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28 IoError(std::io::Error),
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29 /// The revision has not been found.
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30 InvalidRevision,
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31 /// Found more than one revision whose ID match the requested prefix
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32 AmbiguousPrefix,
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33 /// A `revlog` file is corrupted.
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34 CorruptedRevlog,
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35 /// The `revlog` format version is not supported.
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36 UnsuportedRevlogVersion(u16),
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37 /// The `revlog` data format is not supported.
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38 UnknowRevlogDataFormat(u8),
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39 }
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40
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41 /// A `CatRev` error
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42 #[derive(Debug)]
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43 pub struct CatRevError {
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44 /// Kind of error encountered by `CatRev`
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45 pub kind: CatRevErrorKind,
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46 }
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47
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48 impl From<CatRevErrorKind> for CatRevError {
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49 fn from(kind: CatRevErrorKind) -> Self {
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50 CatRevError { kind }
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51 }
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52 }
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53
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54 impl From<RevlogError> for CatRevError {
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55 fn from(err: RevlogError) -> Self {
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56 match err {
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57 RevlogError::IoError(err) => CatRevErrorKind::IoError(err),
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58 RevlogError::UnsuportedVersion(version) => {
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59 CatRevErrorKind::UnsuportedRevlogVersion(version)
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60 }
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61 RevlogError::InvalidRevision => CatRevErrorKind::InvalidRevision,
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62 RevlogError::AmbiguousPrefix => CatRevErrorKind::AmbiguousPrefix,
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63 RevlogError::Corrupted => CatRevErrorKind::CorruptedRevlog,
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64 RevlogError::UnknowDataFormat(format) => {
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65 CatRevErrorKind::UnknowRevlogDataFormat(format)
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66 }
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67 }
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68 .into()
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69 }
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70 }
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71
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72 /// List files under Mercurial control at a given revision.
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73 ///
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74 /// * `root`: Repository root
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75 /// * `rev`: The revision to cat the files from.
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76 /// * `files`: The files to output.
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77 pub fn cat(
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78 root: &Path,
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79 rev: &str,
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80 files: &[HgPathBuf],
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81 ) -> Result<Vec<u8>, CatRevError> {
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82 let changelog = Changelog::open(&root)?;
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83 let manifest = Manifest::open(&root)?;
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84
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85 let changelog_entry = match rev.parse::<Revision>() {
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86 Ok(rev) => changelog.get_rev(rev)?,
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87 _ => {
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88 let changelog_node = NodePrefix::from_hex(&rev)
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89 .map_err(|_| CatRevErrorKind::InvalidRevision)?;
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90 changelog.get_node(changelog_node.borrow())?
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91 }
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92 };
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93 let manifest_node = Node::from_hex(&changelog_entry.manifest_node()?)
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94 .map_err(|_| CatRevErrorKind::CorruptedRevlog)?;
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95
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96 let manifest_entry = manifest.get_node((&manifest_node).into())?;
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97 let mut bytes = vec![];
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98
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99 for (manifest_file, node_bytes) in manifest_entry.files_with_nodes() {
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100 for cat_file in files.iter() {
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101 if cat_file.as_bytes() == manifest_file.as_bytes() {
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102 let index_path = store_path(root, manifest_file, b".i");
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103 let data_path = store_path(root, manifest_file, b".d");
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104
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105 let file_log = Revlog::open(&index_path, Some(&data_path))?;
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106 let file_node = Node::from_hex(node_bytes)
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107 .map_err(|_| CatRevErrorKind::CorruptedRevlog)?;
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108 let file_rev = file_log.get_node_rev((&file_node).into())?;
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109 let data = file_log.get_rev_data(file_rev)?;
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110 if data.starts_with(&METADATA_DELIMITER) {
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111 let end_delimiter_position = data
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112 [METADATA_DELIMITER.len()..]
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113 .windows(METADATA_DELIMITER.len())
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114 .position(|bytes| bytes == METADATA_DELIMITER);
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115 if let Some(position) = end_delimiter_position {
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116 let offset = METADATA_DELIMITER.len() * 2;
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117 bytes.extend(data[position + offset..].iter());
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118 }
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119 } else {
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120 bytes.extend(data);
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121 }
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122 }
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123 }
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124 }
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125
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126 Ok(bytes)
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127 }
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128
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129 fn store_path(root: &Path, hg_path: &HgPath, suffix: &[u8]) -> PathBuf {
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130 let encoded_bytes =
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131 path_encode(&[b"data/", hg_path.as_bytes(), suffix].concat());
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132 [
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133 root,
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134 &Path::new(".hg/store/"),
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135 get_path_from_bytes(&encoded_bytes),
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136 ]
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137 .iter()
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138 .collect()
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139 }