Mercurial > hg
annotate rust/hg-core/src/dirstate/status.rs @ 44193:3c265cef6edc
rust: remove an unnecessary set of parentheses
My build complained about this. I guess it started after I upgraded
rustc.
Differential Revision: https://phab.mercurial-scm.org/D8020
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Mon, 27 Jan 2020 12:38:59 -0800 |
parents | 8c77826116f7 |
children | 0d97bcb3cee9 |
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1 // status.rs |
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2 // |
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3 // Copyright 2019 Raphaël Gomès <rgomes@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 //! Rust implementation of dirstate.status (dirstate.py). |
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9 //! It is currently missing a lot of functionality compared to the Python one |
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10 //! and will only be triggered in narrow cases. |
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11 |
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12 use crate::{ |
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13 dirstate::SIZE_FROM_OTHER_PARENT, |
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14 matchers::Matcher, |
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15 utils::{ |
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16 files::HgMetadata, |
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17 hg_path::{hg_path_to_path_buf, HgPath}, |
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18 }, |
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19 CopyMap, DirstateEntry, DirstateMap, EntryState, |
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20 }; |
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21 use rayon::prelude::*; |
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22 use std::collections::HashSet; |
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23 use std::path::Path; |
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24 |
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25 /// Marker enum used to dispatch new status entries into the right collections. |
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26 /// Is similar to `crate::EntryState`, but represents the transient state of |
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27 /// entries during the lifetime of a command. |
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28 enum Dispatch { |
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29 Unsure, |
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30 Modified, |
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31 Added, |
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32 Removed, |
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33 Deleted, |
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34 Clean, |
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35 Unknown, |
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36 } |
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37 |
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38 type IoResult<T> = std::io::Result<T>; |
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39 |
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40 /// Dates and times that are outside the 31-bit signed range are compared |
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41 /// modulo 2^31. This should prevent hg from behaving badly with very large |
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42 /// files or corrupt dates while still having a high probability of detecting |
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43 /// changes. (issue2608) |
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44 /// TODO I haven't found a way of having `b` be `Into<i32>`, since `From<u64>` |
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45 /// is not defined for `i32`, and there is no `As` trait. This forces the |
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46 /// caller to cast `b` as `i32`. |
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47 fn mod_compare(a: i32, b: i32) -> bool { |
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48 a & i32::max_value() != b & i32::max_value() |
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49 } |
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50 |
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51 /// The file corresponding to the dirstate entry was found on the filesystem. |
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52 fn dispatch_found( |
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53 filename: impl AsRef<HgPath>, |
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54 entry: DirstateEntry, |
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55 metadata: HgMetadata, |
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56 copy_map: &CopyMap, |
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57 check_exec: bool, |
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58 list_clean: bool, |
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59 last_normal_time: i64, |
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60 ) -> Dispatch { |
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61 let DirstateEntry { |
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62 state, |
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63 mode, |
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64 mtime, |
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65 size, |
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66 } = entry; |
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67 |
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68 let HgMetadata { |
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69 st_mode, |
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70 st_size, |
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71 st_mtime, |
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72 .. |
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73 } = metadata; |
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74 |
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75 match state { |
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76 EntryState::Normal => { |
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77 let size_changed = mod_compare(size, st_size as i32); |
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78 let mode_changed = |
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79 (mode ^ st_mode as i32) & 0o100 != 0o000 && check_exec; |
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80 let metadata_changed = size >= 0 && (size_changed || mode_changed); |
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81 let other_parent = size == SIZE_FROM_OTHER_PARENT; |
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82 if metadata_changed |
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83 || other_parent |
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84 || copy_map.contains_key(filename.as_ref()) |
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85 { |
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86 Dispatch::Modified |
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87 } else if mod_compare(mtime, st_mtime as i32) { |
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88 Dispatch::Unsure |
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89 } else if st_mtime == last_normal_time { |
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90 // the file may have just been marked as normal and |
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91 // it may have changed in the same second without |
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92 // changing its size. This can happen if we quickly |
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93 // do multiple commits. Force lookup, so we don't |
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94 // miss such a racy file change. |
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95 Dispatch::Unsure |
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96 } else if list_clean { |
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97 Dispatch::Clean |
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98 } else { |
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99 Dispatch::Unknown |
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100 } |
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101 } |
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102 EntryState::Merged => Dispatch::Modified, |
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103 EntryState::Added => Dispatch::Added, |
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104 EntryState::Removed => Dispatch::Removed, |
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105 EntryState::Unknown => Dispatch::Unknown, |
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106 } |
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107 } |
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108 |
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109 /// The file corresponding to this Dirstate entry is missing. |
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110 fn dispatch_missing(state: EntryState) -> Dispatch { |
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111 match state { |
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112 // File was removed from the filesystem during commands |
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113 EntryState::Normal | EntryState::Merged | EntryState::Added => { |
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114 Dispatch::Deleted |
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115 } |
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116 // File was removed, everything is normal |
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117 EntryState::Removed => Dispatch::Removed, |
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118 // File is unknown to Mercurial, everything is normal |
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119 EntryState::Unknown => Dispatch::Unknown, |
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120 } |
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121 } |
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122 |
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123 /// Get stat data about the files explicitly specified by match. |
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124 /// TODO subrepos |
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125 fn walk_explicit<'a>( |
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126 files: &'a HashSet<&HgPath>, |
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127 dmap: &'a DirstateMap, |
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128 root_dir: impl AsRef<Path> + Sync + Send, |
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129 check_exec: bool, |
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130 list_clean: bool, |
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131 last_normal_time: i64, |
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132 ) -> impl ParallelIterator<Item = IoResult<(&'a HgPath, Dispatch)>> { |
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133 files.par_iter().filter_map(move |filename| { |
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134 // TODO normalization |
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135 let normalized = filename.as_ref(); |
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136 |
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137 let buf = match hg_path_to_path_buf(normalized) { |
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138 Ok(x) => x, |
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139 Err(e) => return Some(Err(e.into())), |
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140 }; |
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141 let target = root_dir.as_ref().join(buf); |
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142 let st = target.symlink_metadata(); |
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143 match st { |
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144 Ok(meta) => { |
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145 let file_type = meta.file_type(); |
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146 if file_type.is_file() || file_type.is_symlink() { |
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147 if let Some(entry) = dmap.get(normalized) { |
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148 return Some(Ok(( |
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149 normalized, |
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150 dispatch_found( |
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151 &normalized, |
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152 *entry, |
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153 HgMetadata::from_metadata(meta), |
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154 &dmap.copy_map, |
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155 check_exec, |
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156 list_clean, |
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157 last_normal_time, |
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158 ), |
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159 ))); |
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160 } |
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161 } else { |
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162 if dmap.contains_key(normalized) { |
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163 return Some(Ok((normalized, Dispatch::Removed))); |
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164 } |
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165 } |
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166 } |
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167 Err(_) => { |
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168 if let Some(entry) = dmap.get(normalized) { |
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169 return Some(Ok(( |
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170 normalized, |
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171 dispatch_missing(entry.state), |
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172 ))); |
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173 } |
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174 } |
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175 }; |
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176 None |
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177 }) |
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178 } |
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179 |
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180 /// Stat all entries in the `DirstateMap` and mark them for dispatch into |
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181 /// the relevant collections. |
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182 fn stat_dmap_entries( |
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183 dmap: &DirstateMap, |
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184 root_dir: impl AsRef<Path> + Sync + Send, |
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185 check_exec: bool, |
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186 list_clean: bool, |
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187 last_normal_time: i64, |
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188 ) -> impl ParallelIterator<Item = IoResult<(&HgPath, Dispatch)>> { |
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189 dmap.par_iter().map(move |(filename, entry)| { |
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190 let filename: &HgPath = filename; |
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191 let filename_as_path = hg_path_to_path_buf(filename)?; |
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192 let meta = root_dir.as_ref().join(filename_as_path).symlink_metadata(); |
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193 |
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194 match meta { |
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195 Ok(ref m) |
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196 if !(m.file_type().is_file() |
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197 || m.file_type().is_symlink()) => |
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198 { |
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199 Ok((filename, dispatch_missing(entry.state))) |
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200 } |
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201 Ok(m) => Ok(( |
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202 filename, |
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203 dispatch_found( |
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204 filename, |
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205 *entry, |
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206 HgMetadata::from_metadata(m), |
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207 &dmap.copy_map, |
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208 check_exec, |
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209 list_clean, |
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210 last_normal_time, |
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211 ), |
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212 )), |
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213 Err(ref e) |
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214 if e.kind() == std::io::ErrorKind::NotFound |
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215 || e.raw_os_error() == Some(20) => |
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216 { |
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217 // Rust does not yet have an `ErrorKind` for |
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218 // `NotADirectory` (errno 20) |
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219 // It happens if the dirstate contains `foo/bar` and |
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220 // foo is not a directory |
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221 Ok((filename, dispatch_missing(entry.state))) |
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222 } |
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223 Err(e) => Err(e), |
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224 } |
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225 }) |
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226 } |
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227 |
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228 pub struct StatusResult<'a> { |
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229 pub modified: Vec<&'a HgPath>, |
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230 pub added: Vec<&'a HgPath>, |
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231 pub removed: Vec<&'a HgPath>, |
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232 pub deleted: Vec<&'a HgPath>, |
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233 pub clean: Vec<&'a HgPath>, |
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234 /* TODO ignored |
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235 * TODO unknown */ |
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236 } |
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237 |
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238 fn build_response<'a>( |
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239 results: impl IntoIterator<Item = IoResult<(&'a HgPath, Dispatch)>>, |
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240 ) -> IoResult<(Vec<&'a HgPath>, StatusResult<'a>)> { |
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241 let mut lookup = vec![]; |
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242 let mut modified = vec![]; |
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243 let mut added = vec![]; |
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244 let mut removed = vec![]; |
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245 let mut deleted = vec![]; |
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246 let mut clean = vec![]; |
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247 |
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248 for res in results.into_iter() { |
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249 let (filename, dispatch) = res?; |
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250 match dispatch { |
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251 Dispatch::Unknown => {} |
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252 Dispatch::Unsure => lookup.push(filename), |
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253 Dispatch::Modified => modified.push(filename), |
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254 Dispatch::Added => added.push(filename), |
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255 Dispatch::Removed => removed.push(filename), |
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256 Dispatch::Deleted => deleted.push(filename), |
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257 Dispatch::Clean => clean.push(filename), |
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258 } |
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259 } |
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260 |
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261 Ok(( |
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262 lookup, |
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263 StatusResult { |
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264 modified, |
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265 added, |
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266 removed, |
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267 deleted, |
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268 clean, |
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269 }, |
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270 )) |
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271 } |
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272 |
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273 pub fn status<'a: 'c, 'b: 'c, 'c>( |
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274 dmap: &'a DirstateMap, |
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275 matcher: &'b impl Matcher, |
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276 root_dir: impl AsRef<Path> + Sync + Send + Copy, |
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277 list_clean: bool, |
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278 last_normal_time: i64, |
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279 check_exec: bool, |
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280 ) -> IoResult<(Vec<&'c HgPath>, StatusResult<'c>)> { |
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281 let files = matcher.file_set(); |
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282 let mut results = vec![]; |
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283 if let Some(files) = files { |
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284 results.par_extend(walk_explicit( |
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285 &files, |
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286 &dmap, |
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287 root_dir, |
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288 check_exec, |
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289 list_clean, |
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290 last_normal_time, |
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291 )); |
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292 } |
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293 |
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294 if !matcher.is_exact() { |
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295 let stat_results = stat_dmap_entries( |
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296 &dmap, |
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297 root_dir, |
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298 check_exec, |
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299 list_clean, |
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300 last_normal_time, |
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301 ); |
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302 results.par_extend(stat_results); |
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303 } |
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304 |
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305 build_response(results) |
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306 } |