Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 47097:e66ea29e2b1a
dirstate-tree: Implement DirstateMap::read
This reads the on-disk dirstate in its current format (a flat sequence of
entries) and creates a tree in memory.
Differential Revision: https://phab.mercurial-scm.org/D10367
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Wed, 31 Mar 2021 18:59:49 +0200 |
parents | 473abf4728bf |
children | d7631d55da3e |
rev | line source |
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1 use std::collections::BTreeMap; |
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2 use std::path::PathBuf; |
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3 use std::time::Duration; |
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4 |
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5 use super::path_with_basename::WithBasename; |
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6 |
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7 use crate::dirstate::parsers::parse_dirstate_entries; |
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8 use crate::matchers::Matcher; |
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9 use crate::revlog::node::NULL_NODE; |
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10 use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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11 use crate::CopyMapIter; |
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12 use crate::DirstateEntry; |
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13 use crate::DirstateError; |
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14 use crate::DirstateMapError; |
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15 use crate::DirstateParents; |
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16 use crate::DirstateStatus; |
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17 use crate::EntryState; |
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18 use crate::FastHashMap; |
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19 use crate::HgPathCow; |
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20 use crate::PatternFileWarning; |
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21 use crate::StateMapIter; |
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22 use crate::StatusError; |
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23 use crate::StatusOptions; |
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24 |
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25 pub struct DirstateMap { |
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26 parents: Option<DirstateParents>, |
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27 dirty_parents: bool, |
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28 root: ChildNodes, |
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29 } |
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30 |
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31 /// Using a plain `HgPathBuf` of the full path from the repository root as a |
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32 /// map key would also work: all paths in a given map have the same parent |
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33 /// path, so comparing full paths gives the same result as comparing base |
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34 /// names. However `BTreeMap` would waste time always re-comparing the same |
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35 /// string prefix. |
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36 type ChildNodes = BTreeMap<WithBasename<HgPathBuf>, Node>; |
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37 |
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38 #[derive(Default)] |
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39 struct Node { |
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40 entry: Option<DirstateEntry>, |
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41 copy_source: Option<HgPathBuf>, |
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42 children: ChildNodes, |
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43 } |
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44 |
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45 impl DirstateMap { |
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46 pub fn new() -> Self { |
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47 Self { |
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48 parents: None, |
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49 dirty_parents: false, |
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50 root: ChildNodes::new(), |
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51 } |
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52 } |
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53 |
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54 fn get_or_insert_node(&mut self, path: &HgPath) -> &mut Node { |
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55 let mut child_nodes = &mut self.root; |
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56 let mut inclusive_ancestor_paths = |
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57 WithBasename::inclusive_ancestors_of(path); |
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58 let mut ancestor_path = inclusive_ancestor_paths |
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59 .next() |
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60 .expect("expected at least one inclusive ancestor"); |
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61 loop { |
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62 // TODO: can we avoid double lookup in all cases without allocating |
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63 // an owned key in cases where the map already contains that key? |
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64 let child_node = |
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65 if child_nodes.contains_key(ancestor_path.base_name()) { |
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66 child_nodes.get_mut(ancestor_path.base_name()).unwrap() |
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67 } else { |
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68 // This is always a vacant entry, using `.entry()` lets us |
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69 // return a `&mut Node` of the newly-inserted node without |
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70 // yet another lookup. `BTreeMap::insert` doesn’t do this. |
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71 child_nodes.entry(ancestor_path.to_owned()).or_default() |
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72 }; |
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73 if let Some(next) = inclusive_ancestor_paths.next() { |
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74 ancestor_path = next; |
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75 child_nodes = &mut child_node.children; |
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76 } else { |
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77 return child_node; |
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78 } |
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79 } |
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80 } |
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81 } |
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82 |
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83 impl super::dispatch::DirstateMapMethods for DirstateMap { |
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84 fn clear(&mut self) { |
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85 self.set_parents(&DirstateParents { |
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86 p1: NULL_NODE, |
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87 p2: NULL_NODE, |
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88 }); |
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89 self.root.clear() |
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90 } |
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91 |
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92 fn add_file( |
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93 &mut self, |
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94 _filename: &HgPath, |
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95 _old_state: EntryState, |
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96 _entry: DirstateEntry, |
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97 ) -> Result<(), DirstateMapError> { |
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98 todo!() |
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99 } |
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100 |
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101 fn remove_file( |
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102 &mut self, |
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103 _filename: &HgPath, |
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104 _old_state: EntryState, |
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105 _size: i32, |
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106 ) -> Result<(), DirstateMapError> { |
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107 todo!() |
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108 } |
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109 |
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110 fn drop_file( |
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111 &mut self, |
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112 _filename: &HgPath, |
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113 _old_state: EntryState, |
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114 ) -> Result<bool, DirstateMapError> { |
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115 todo!() |
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116 } |
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117 |
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118 fn clear_ambiguous_times( |
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119 &mut self, |
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120 _filenames: Vec<HgPathBuf>, |
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121 _now: i32, |
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122 ) { |
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123 todo!() |
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124 } |
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125 |
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126 fn non_normal_entries_contains(&mut self, _key: &HgPath) -> bool { |
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127 todo!() |
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128 } |
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129 |
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130 fn non_normal_entries_remove(&mut self, _key: &HgPath) -> bool { |
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131 todo!() |
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132 } |
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133 |
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134 fn non_normal_or_other_parent_paths( |
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135 &mut self, |
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136 ) -> Box<dyn Iterator<Item = &HgPathBuf> + '_> { |
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137 todo!() |
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138 } |
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139 |
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140 fn set_non_normal_other_parent_entries(&mut self, _force: bool) { |
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141 todo!() |
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142 } |
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143 |
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144 fn iter_non_normal_paths( |
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145 &mut self, |
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146 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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147 todo!() |
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148 } |
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149 |
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150 fn iter_non_normal_paths_panic( |
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151 &self, |
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152 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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153 todo!() |
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154 } |
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155 |
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156 fn iter_other_parent_paths( |
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157 &mut self, |
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158 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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159 todo!() |
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160 } |
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161 |
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162 fn has_tracked_dir( |
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163 &mut self, |
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164 _directory: &HgPath, |
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165 ) -> Result<bool, DirstateMapError> { |
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166 todo!() |
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167 } |
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168 |
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169 fn has_dir( |
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170 &mut self, |
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171 _directory: &HgPath, |
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172 ) -> Result<bool, DirstateMapError> { |
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173 todo!() |
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174 } |
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175 |
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176 fn parents( |
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177 &mut self, |
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178 _file_contents: &[u8], |
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179 ) -> Result<&DirstateParents, DirstateError> { |
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180 todo!() |
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181 } |
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182 |
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183 fn set_parents(&mut self, parents: &DirstateParents) { |
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184 self.parents = Some(parents.clone()); |
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185 self.dirty_parents = true; |
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186 } |
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187 |
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188 fn read<'a>( |
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189 &mut self, |
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190 file_contents: &'a [u8], |
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191 ) -> Result<Option<&'a DirstateParents>, DirstateError> { |
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192 if file_contents.is_empty() { |
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193 return Ok(None); |
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194 } |
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195 |
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196 let parents = parse_dirstate_entries( |
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197 file_contents, |
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198 |path, entry, copy_source| { |
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199 let node = self.get_or_insert_node(path); |
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200 node.entry = Some(*entry); |
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201 node.copy_source = copy_source.map(HgPath::to_owned); |
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202 }, |
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203 )?; |
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204 |
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205 if !self.dirty_parents { |
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206 self.set_parents(parents); |
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207 } |
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208 |
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209 Ok(Some(parents)) |
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210 } |
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211 |
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212 fn pack( |
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213 &mut self, |
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214 _parents: DirstateParents, |
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215 _now: Duration, |
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216 ) -> Result<Vec<u8>, DirstateError> { |
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217 todo!() |
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218 } |
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219 |
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220 fn build_file_fold_map(&mut self) -> &FastHashMap<HgPathBuf, HgPathBuf> { |
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221 todo!() |
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222 } |
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223 |
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224 fn set_all_dirs(&mut self) -> Result<(), DirstateMapError> { |
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225 todo!() |
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226 } |
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227 |
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228 fn set_dirs(&mut self) -> Result<(), DirstateMapError> { |
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229 todo!() |
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230 } |
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231 |
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232 fn status<'a>( |
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233 &'a self, |
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234 _matcher: &'a (dyn Matcher + Sync), |
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235 _root_dir: PathBuf, |
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236 _ignore_files: Vec<PathBuf>, |
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237 _options: StatusOptions, |
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238 ) -> Result< |
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239 ( |
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240 (Vec<HgPathCow<'a>>, DirstateStatus<'a>), |
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241 Vec<PatternFileWarning>, |
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242 ), |
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243 StatusError, |
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244 > { |
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245 todo!() |
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246 } |
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247 |
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248 fn copy_map_len(&self) -> usize { |
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249 todo!() |
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250 } |
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251 |
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252 fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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253 todo!() |
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254 } |
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255 |
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256 fn copy_map_contains_key(&self, _key: &HgPath) -> bool { |
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257 todo!() |
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258 } |
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259 |
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260 fn copy_map_get(&self, _key: &HgPath) -> Option<&HgPathBuf> { |
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261 todo!() |
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262 } |
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263 |
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264 fn copy_map_remove(&mut self, _key: &HgPath) -> Option<HgPathBuf> { |
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265 todo!() |
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266 } |
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267 |
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268 fn copy_map_insert( |
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269 &mut self, |
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270 _key: HgPathBuf, |
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271 _value: HgPathBuf, |
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272 ) -> Option<HgPathBuf> { |
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273 todo!() |
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274 } |
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275 |
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276 fn len(&self) -> usize { |
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277 todo!() |
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278 } |
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279 |
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280 fn contains_key(&self, _key: &HgPath) -> bool { |
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281 todo!() |
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282 } |
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283 |
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284 fn get(&self, _key: &HgPath) -> Option<&DirstateEntry> { |
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285 todo!() |
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286 } |
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287 |
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288 fn iter(&self) -> StateMapIter<'_> { |
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289 todo!() |
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290 } |
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291 } |