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annotate rust/hg-core/src/utils/files.rs @ 44314:0e9ac3968b56

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rust-dirs-multiset: add `DirsChildrenMultiset` In a future patch, this structure will be needed to store information needed by the (also upcoming) `IgnoreMatcher`. Differential Revision: https://phab.mercurial-scm.org/D7869
author Rapha?l Gom?s <rgomes@octobus.net>
date Tue, 14 Jan 2020 17:04:32 +0100
parents c18dd48cea4a
children 4caac36c66bc
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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
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14 use crate::utils::replace_slice;
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15 use lazy_static::lazy_static;
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16 use std::fs::Metadata;
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17 use std::iter::FusedIterator;
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18 use std::path::Path;
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19
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20 pub fn get_path_from_bytes(bytes: &[u8]) -> &Path {
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21 let os_str;
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22 #[cfg(unix)]
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23 {
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24 use std::os::unix::ffi::OsStrExt;
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25 os_str = std::ffi::OsStr::from_bytes(bytes);
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26 }
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27 // TODO Handle other platforms
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28 // TODO: convert from WTF8 to Windows MBCS (ANSI encoding).
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29 // Perhaps, the return type would have to be Result<PathBuf>.
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30
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31 Path::new(os_str)
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32 }
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33
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34 // TODO: need to convert from WTF8 to MBCS bytes on Windows.
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35 // that's why Vec<u8> is returned.
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36 #[cfg(unix)]
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37 pub fn get_bytes_from_path(path: impl AsRef<Path>) -> Vec<u8> {
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38 use std::os::unix::ffi::OsStrExt;
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39 path.as_ref().as_os_str().as_bytes().to_vec()
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40 }
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41
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42 /// An iterator over repository path yielding itself and its ancestors.
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43 #[derive(Copy, Clone, Debug)]
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44 pub struct Ancestors<'a> {
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45 next: Option<&'a HgPath>,
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46 }
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47
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48 impl<'a> Iterator for Ancestors<'a> {
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49 type Item = &'a HgPath;
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50
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51 fn next(&mut self) -> Option<Self::Item> {
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52 let next = self.next;
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53 self.next = match self.next {
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54 Some(s) if s.is_empty() => None,
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55 Some(s) => {
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56 let p = s.bytes().rposition(|c| *c == b'/').unwrap_or(0);
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57 Some(HgPath::new(&s.as_bytes()[..p]))
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58 }
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59 None => None,
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60 };
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61 next
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62 }
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63 }
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64
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65 impl<'a> FusedIterator for Ancestors<'a> {}
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66
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67 /// An iterator over repository path yielding itself and its ancestors.
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68 #[derive(Copy, Clone, Debug)]
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69 pub(crate) struct AncestorsWithBase<'a> {
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70 next: Option<(&'a HgPath, &'a HgPath)>,
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71 }
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72
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73 impl<'a> Iterator for AncestorsWithBase<'a> {
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74 type Item = (&'a HgPath, &'a HgPath);
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75
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76 fn next(&mut self) -> Option<Self::Item> {
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77 let next = self.next;
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78 self.next = match self.next {
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79 Some((s, _)) if s.is_empty() => None,
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80 Some((s, _)) => Some(s.split_filename()),
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81 None => None,
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82 };
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83 next
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84 }
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85 }
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86
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87 impl<'a> FusedIterator for AncestorsWithBase<'a> {}
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88
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89 /// Returns an iterator yielding ancestor directories of the given repository
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90 /// path.
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91 ///
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92 /// The path is separated by '/', and must not start with '/'.
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93 ///
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94 /// The path itself isn't included unless it is b"" (meaning the root
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95 /// directory.)
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96 pub fn find_dirs<'a>(path: &'a HgPath) -> Ancestors<'a> {
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97 let mut dirs = Ancestors { next: Some(path) };
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98 if !path.is_empty() {
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99 dirs.next(); // skip itself
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100 }
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101 dirs
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102 }
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103
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104 /// Returns an iterator yielding ancestor directories of the given repository
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105 /// path.
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106 ///
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107 /// The path is separated by '/', and must not start with '/'.
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108 ///
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109 /// The path itself isn't included unless it is b"" (meaning the root
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110 /// directory.)
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111 pub(crate) fn find_dirs_with_base<'a>(
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112 path: &'a HgPath,
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113 ) -> AncestorsWithBase<'a> {
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114 let mut dirs = AncestorsWithBase {
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115 next: Some((path, HgPath::new(b""))),
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116 };
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117 if !path.is_empty() {
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118 dirs.next(); // skip itself
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119 }
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120 dirs
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121 }
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122
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123 /// TODO more than ASCII?
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124 pub fn normalize_case(path: &HgPath) -> HgPathBuf {
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125 #[cfg(windows)] // NTFS compares via upper()
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126 return path.to_ascii_uppercase();
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127 #[cfg(unix)]
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128 path.to_ascii_lowercase()
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129 }
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130
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131 lazy_static! {
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132 static ref IGNORED_CHARS: Vec<Vec<u8>> = {
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133 [
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134 0x200c, 0x200d, 0x200e, 0x200f, 0x202a, 0x202b, 0x202c, 0x202d,
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135 0x202e, 0x206a, 0x206b, 0x206c, 0x206d, 0x206e, 0x206f, 0xfeff,
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136 ]
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137 .iter()
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138 .map(|code| {
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139 std::char::from_u32(*code)
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140 .unwrap()
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141 .encode_utf8(&mut [0; 3])
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142 .bytes()
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143 .collect()
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144 })
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145 .collect()
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146 };
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147 }
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148
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149 fn hfs_ignore_clean(bytes: &[u8]) -> Vec<u8> {
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150 let mut buf = bytes.to_owned();
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151 let needs_escaping = bytes.iter().any(|b| *b == b'\xe2' || *b == b'\xef');
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152 if needs_escaping {
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153 for forbidden in IGNORED_CHARS.iter() {
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154 replace_slice(&mut buf, forbidden, &[])
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155 }
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156 buf
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157 } else {
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158 buf
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159 }
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160 }
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161
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162 pub fn lower_clean(bytes: &[u8]) -> Vec<u8> {
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163 hfs_ignore_clean(&bytes.to_ascii_lowercase())
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164 }
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165
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166 #[derive(Eq, PartialEq, Ord, PartialOrd, Copy, Clone)]
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167 pub struct HgMetadata {
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168 pub st_dev: u64,
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169 pub st_mode: u32,
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170 pub st_nlink: u64,
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171 pub st_size: u64,
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172 pub st_mtime: i64,
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173 pub st_ctime: i64,
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174 }
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175
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176 // TODO support other plaforms
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177 #[cfg(unix)]
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178 impl HgMetadata {
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179 pub fn from_metadata(metadata: Metadata) -> Self {
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180 use std::os::unix::fs::MetadataExt;
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181 Self {
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182 st_dev: metadata.dev(),
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183 st_mode: metadata.mode(),
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184 st_nlink: metadata.nlink(),
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185 st_size: metadata.size(),
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186 st_mtime: metadata.mtime(),
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187 st_ctime: metadata.ctime(),
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188 }
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189 }
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190 }
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191
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192 #[cfg(test)]
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193 mod tests {
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194 use super::*;
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195
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196 #[test]
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197 fn find_dirs_some() {
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198 let mut dirs = super::find_dirs(HgPath::new(b"foo/bar/baz"));
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199 assert_eq!(dirs.next(), Some(HgPath::new(b"foo/bar")));
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200 assert_eq!(dirs.next(), Some(HgPath::new(b"foo")));
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201 assert_eq!(dirs.next(), Some(HgPath::new(b"")));
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202 assert_eq!(dirs.next(), None);
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203 assert_eq!(dirs.next(), None);
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204 }
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205
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206 #[test]
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207 fn find_dirs_empty() {
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208 // looks weird, but mercurial.pathutil.finddirs(b"") yields b""
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209 let mut dirs = super::find_dirs(HgPath::new(b""));
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210 assert_eq!(dirs.next(), Some(HgPath::new(b"")));
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211 assert_eq!(dirs.next(), None);
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212 assert_eq!(dirs.next(), None);
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213 }
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214
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215 #[test]
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216 fn test_find_dirs_with_base_some() {
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217 let mut dirs = super::find_dirs_with_base(HgPath::new(b"foo/bar/baz"));
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218 assert_eq!(
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219 dirs.next(),
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220 Some((HgPath::new(b"foo/bar"), HgPath::new(b"baz")))
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221 );
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222 assert_eq!(
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223 dirs.next(),
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224 Some((HgPath::new(b"foo"), HgPath::new(b"bar")))
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225 );
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226 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b"foo"))));
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227 assert_eq!(dirs.next(), None);
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228 assert_eq!(dirs.next(), None);
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229 }
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230
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231 #[test]
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232 fn test_find_dirs_with_base_empty() {
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233 let mut dirs = super::find_dirs_with_base(HgPath::new(b""));
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234 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b""))));
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235 assert_eq!(dirs.next(), None);
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236 assert_eq!(dirs.next(), None);
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237 }
42586
cad3dde7a573 rust-dirstate: add helper to iterate ancestor paths
Yuya Nishihara <yuya@tcha.org>
parents: 42499
diff changeset
238 }