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annotate rust/hg-core/src/utils/files.rs @ 43467:b06cf2809ec3 stable

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rust-cpython: do not convert warning pattern to utf-8 bytes On Unix, both Rust Path and Mercurial expect a locale-dependent bytes, and we don't support Windows yet. Differential Revision: https://phab.mercurial-scm.org/D7614
author Yuya Nishihara <yuya@tcha.org>
date Tue, 19 Nov 2019 23:19:57 +0900
parents 99394e6c5d12
children cf065c6a0197
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1 // files.rs
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2 //
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3 // Copyright 2019
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4 // Raphaël Gomès <rgomes@octobus.net>,
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5 // Yuya Nishihara <yuya@tcha.org>
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6 //
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7 // This software may be used and distributed according to the terms of the
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8 // GNU General Public License version 2 or any later version.
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9
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10 //! Functions for fiddling with files.
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11
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12 use crate::utils::hg_path::{HgPath, HgPathBuf};
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13 use std::iter::FusedIterator;
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14
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15 use std::fs::Metadata;
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16 use std::path::Path;
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17
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18 pub fn get_path_from_bytes(bytes: &[u8]) -> &Path {
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19 let os_str;
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20 #[cfg(unix)]
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21 {
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22 use std::os::unix::ffi::OsStrExt;
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23 os_str = std::ffi::OsStr::from_bytes(bytes);
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24 }
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25 // TODO Handle other platforms
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26 // TODO: convert from WTF8 to Windows MBCS (ANSI encoding).
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27 // Perhaps, the return type would have to be Result<PathBuf>.
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28
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29 Path::new(os_str)
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30 }
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31
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32 // TODO: need to convert from WTF8 to MBCS bytes on Windows.
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33 // that's why Vec<u8> is returned.
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34 #[cfg(unix)]
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35 pub fn get_bytes_from_path(path: impl AsRef<Path>) -> Vec<u8> {
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36 use std::os::unix::ffi::OsStrExt;
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37 path.as_ref().as_os_str().as_bytes().to_vec()
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38 }
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39
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40 /// An iterator over repository path yielding itself and its ancestors.
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41 #[derive(Copy, Clone, Debug)]
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42 pub struct Ancestors<'a> {
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43 next: Option<&'a HgPath>,
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44 }
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45
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46 impl<'a> Iterator for Ancestors<'a> {
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47 type Item = &'a HgPath;
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48
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49 fn next(&mut self) -> Option<Self::Item> {
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50 let next = self.next;
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51 self.next = match self.next {
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52 Some(s) if s.is_empty() => None,
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53 Some(s) => {
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54 let p = s.bytes().rposition(|c| *c == b'/').unwrap_or(0);
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55 Some(HgPath::new(&s.as_bytes()[..p]))
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56 }
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57 None => None,
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58 };
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59 next
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60 }
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61 }
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62
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63 impl<'a> FusedIterator for Ancestors<'a> {}
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64
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65 /// Returns an iterator yielding ancestor directories of the given repository
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66 /// path.
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67 ///
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68 /// The path is separated by '/', and must not start with '/'.
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69 ///
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70 /// The path itself isn't included unless it is b"" (meaning the root
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71 /// directory.)
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72 pub fn find_dirs<'a>(path: &'a HgPath) -> Ancestors<'a> {
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73 let mut dirs = Ancestors { next: Some(path) };
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74 if !path.is_empty() {
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75 dirs.next(); // skip itself
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76 }
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77 dirs
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78 }
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79
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80 /// TODO more than ASCII?
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81 pub fn normalize_case(path: &HgPath) -> HgPathBuf {
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82 #[cfg(windows)] // NTFS compares via upper()
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83 return path.to_ascii_uppercase();
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84 #[cfg(unix)]
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85 path.to_ascii_lowercase()
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86 }
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87
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88 #[derive(Eq, PartialEq, Ord, PartialOrd, Copy, Clone)]
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89 pub struct HgMetadata {
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90 pub st_dev: u64,
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91 pub st_mode: u32,
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92 pub st_nlink: u64,
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93 pub st_size: u64,
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94 pub st_mtime: i64,
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95 pub st_ctime: i64,
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96 }
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97
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98 // TODO support other plaforms
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99 #[cfg(unix)]
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100 impl HgMetadata {
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101 pub fn from_metadata(metadata: Metadata) -> Self {
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102 use std::os::unix::fs::MetadataExt;
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103 Self {
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104 st_dev: metadata.dev(),
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105 st_mode: metadata.mode(),
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106 st_nlink: metadata.nlink(),
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107 st_size: metadata.size(),
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108 st_mtime: metadata.mtime(),
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109 st_ctime: metadata.ctime(),
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110 }
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111 }
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112 }
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113
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114 #[cfg(test)]
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115 mod tests {
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116 use super::*;
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117
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118 #[test]
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119 fn find_dirs_some() {
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120 let mut dirs = super::find_dirs(HgPath::new(b"foo/bar/baz"));
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121 assert_eq!(dirs.next(), Some(HgPath::new(b"foo/bar")));
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122 assert_eq!(dirs.next(), Some(HgPath::new(b"foo")));
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123 assert_eq!(dirs.next(), Some(HgPath::new(b"")));
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124 assert_eq!(dirs.next(), None);
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125 assert_eq!(dirs.next(), None);
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126 }
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127
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128 #[test]
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129 fn find_dirs_empty() {
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130 // looks weird, but mercurial.util.finddirs(b"") yields b""
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131 let mut dirs = super::find_dirs(HgPath::new(b""));
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132 assert_eq!(dirs.next(), Some(HgPath::new(b"")));
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133 assert_eq!(dirs.next(), None);
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134 assert_eq!(dirs.next(), None);
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135 }
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136 }