Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 47098:d7631d55da3e
dirstate-tree: Add parsing only dirstate parents from disk
Differential Revision: https://phab.mercurial-scm.org/D10368
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Tue, 06 Apr 2021 14:29:05 +0200 |
parents | e66ea29e2b1a |
children | 3da19db33cbc |
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 use crate::dirstate::parsers::parse_dirstate_entries; |
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7 use crate::dirstate::parsers::parse_dirstate_parents; |
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8 |
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9 use crate::matchers::Matcher; |
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10 use crate::revlog::node::NULL_NODE; |
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11 use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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12 use crate::CopyMapIter; |
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13 use crate::DirstateEntry; |
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14 use crate::DirstateError; |
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15 use crate::DirstateMapError; |
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16 use crate::DirstateParents; |
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17 use crate::DirstateStatus; |
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18 use crate::EntryState; |
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19 use crate::FastHashMap; |
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20 use crate::HgPathCow; |
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21 use crate::PatternFileWarning; |
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22 use crate::StateMapIter; |
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23 use crate::StatusError; |
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24 use crate::StatusOptions; |
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25 |
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26 pub struct DirstateMap { |
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27 parents: Option<DirstateParents>, |
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28 dirty_parents: bool, |
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29 root: ChildNodes, |
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30 } |
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31 |
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32 /// Using a plain `HgPathBuf` of the full path from the repository root as a |
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33 /// map key would also work: all paths in a given map have the same parent |
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34 /// path, so comparing full paths gives the same result as comparing base |
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35 /// names. However `BTreeMap` would waste time always re-comparing the same |
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36 /// string prefix. |
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37 type ChildNodes = BTreeMap<WithBasename<HgPathBuf>, Node>; |
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38 |
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39 #[derive(Default)] |
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40 struct Node { |
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41 entry: Option<DirstateEntry>, |
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42 copy_source: Option<HgPathBuf>, |
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43 children: ChildNodes, |
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44 } |
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45 |
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46 impl DirstateMap { |
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47 pub fn new() -> Self { |
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48 Self { |
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49 parents: None, |
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50 dirty_parents: false, |
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51 root: ChildNodes::new(), |
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52 } |
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53 } |
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54 |
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55 fn get_or_insert_node(&mut self, path: &HgPath) -> &mut Node { |
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56 let mut child_nodes = &mut self.root; |
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57 let mut inclusive_ancestor_paths = |
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58 WithBasename::inclusive_ancestors_of(path); |
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59 let mut ancestor_path = inclusive_ancestor_paths |
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60 .next() |
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61 .expect("expected at least one inclusive ancestor"); |
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62 loop { |
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63 // TODO: can we avoid double lookup in all cases without allocating |
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64 // an owned key in cases where the map already contains that key? |
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65 let child_node = |
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66 if child_nodes.contains_key(ancestor_path.base_name()) { |
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67 child_nodes.get_mut(ancestor_path.base_name()).unwrap() |
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68 } else { |
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69 // This is always a vacant entry, using `.entry()` lets us |
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70 // return a `&mut Node` of the newly-inserted node without |
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71 // yet another lookup. `BTreeMap::insert` doesn’t do this. |
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72 child_nodes.entry(ancestor_path.to_owned()).or_default() |
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73 }; |
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74 if let Some(next) = inclusive_ancestor_paths.next() { |
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75 ancestor_path = next; |
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76 child_nodes = &mut child_node.children; |
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77 } else { |
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78 return child_node; |
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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 |
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84 impl super::dispatch::DirstateMapMethods for DirstateMap { |
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85 fn clear(&mut self) { |
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86 self.set_parents(&DirstateParents { |
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87 p1: NULL_NODE, |
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88 p2: NULL_NODE, |
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89 }); |
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90 self.root.clear() |
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91 } |
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92 |
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93 fn add_file( |
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94 &mut self, |
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95 _filename: &HgPath, |
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96 _old_state: EntryState, |
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97 _entry: DirstateEntry, |
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98 ) -> Result<(), DirstateMapError> { |
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99 todo!() |
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100 } |
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101 |
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102 fn remove_file( |
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103 &mut self, |
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104 _filename: &HgPath, |
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105 _old_state: EntryState, |
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106 _size: i32, |
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107 ) -> Result<(), DirstateMapError> { |
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108 todo!() |
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109 } |
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110 |
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111 fn drop_file( |
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112 &mut self, |
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113 _filename: &HgPath, |
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114 _old_state: EntryState, |
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115 ) -> Result<bool, DirstateMapError> { |
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116 todo!() |
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117 } |
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118 |
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119 fn clear_ambiguous_times( |
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120 &mut self, |
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121 _filenames: Vec<HgPathBuf>, |
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122 _now: i32, |
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123 ) { |
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124 todo!() |
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125 } |
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126 |
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127 fn non_normal_entries_contains(&mut self, _key: &HgPath) -> bool { |
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128 todo!() |
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129 } |
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130 |
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131 fn non_normal_entries_remove(&mut self, _key: &HgPath) -> bool { |
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132 todo!() |
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133 } |
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134 |
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135 fn non_normal_or_other_parent_paths( |
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136 &mut self, |
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137 ) -> Box<dyn Iterator<Item = &HgPathBuf> + '_> { |
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138 todo!() |
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139 } |
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140 |
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141 fn set_non_normal_other_parent_entries(&mut self, _force: bool) { |
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142 todo!() |
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143 } |
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144 |
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145 fn iter_non_normal_paths( |
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146 &mut self, |
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147 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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148 todo!() |
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149 } |
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150 |
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151 fn iter_non_normal_paths_panic( |
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152 &self, |
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153 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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154 todo!() |
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155 } |
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156 |
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157 fn iter_other_parent_paths( |
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158 &mut self, |
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159 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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160 todo!() |
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161 } |
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162 |
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163 fn has_tracked_dir( |
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164 &mut self, |
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165 _directory: &HgPath, |
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166 ) -> Result<bool, DirstateMapError> { |
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167 todo!() |
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168 } |
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169 |
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170 fn has_dir( |
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171 &mut self, |
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172 _directory: &HgPath, |
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173 ) -> Result<bool, DirstateMapError> { |
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174 todo!() |
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175 } |
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176 |
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177 fn parents( |
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178 &mut self, |
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179 file_contents: &[u8], |
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180 ) -> Result<&DirstateParents, DirstateError> { |
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181 if self.parents.is_none() { |
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182 let parents = if !file_contents.is_empty() { |
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183 parse_dirstate_parents(file_contents)?.clone() |
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184 } else { |
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185 DirstateParents { |
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186 p1: NULL_NODE, |
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187 p2: NULL_NODE, |
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188 } |
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189 }; |
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190 self.parents = Some(parents); |
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191 } |
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192 Ok(self.parents.as_ref().unwrap()) |
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193 } |
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194 |
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195 fn set_parents(&mut self, parents: &DirstateParents) { |
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196 self.parents = Some(parents.clone()); |
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197 self.dirty_parents = true; |
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198 } |
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199 |
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200 fn read<'a>( |
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201 &mut self, |
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202 file_contents: &'a [u8], |
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203 ) -> Result<Option<&'a DirstateParents>, DirstateError> { |
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204 if file_contents.is_empty() { |
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205 return Ok(None); |
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206 } |
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207 |
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208 let parents = parse_dirstate_entries( |
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209 file_contents, |
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210 |path, entry, copy_source| { |
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211 let node = self.get_or_insert_node(path); |
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212 node.entry = Some(*entry); |
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213 node.copy_source = copy_source.map(HgPath::to_owned); |
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214 }, |
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215 )?; |
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216 |
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217 if !self.dirty_parents { |
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218 self.set_parents(parents); |
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219 } |
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220 |
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221 Ok(Some(parents)) |
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222 } |
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223 |
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224 fn pack( |
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225 &mut self, |
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226 _parents: DirstateParents, |
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227 _now: Duration, |
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228 ) -> Result<Vec<u8>, DirstateError> { |
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229 todo!() |
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230 } |
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231 |
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232 fn build_file_fold_map(&mut self) -> &FastHashMap<HgPathBuf, HgPathBuf> { |
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233 todo!() |
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234 } |
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235 |
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236 fn set_all_dirs(&mut self) -> Result<(), DirstateMapError> { |
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237 todo!() |
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238 } |
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239 |
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240 fn set_dirs(&mut self) -> Result<(), DirstateMapError> { |
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241 todo!() |
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242 } |
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243 |
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244 fn status<'a>( |
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245 &'a self, |
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246 _matcher: &'a (dyn Matcher + Sync), |
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247 _root_dir: PathBuf, |
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248 _ignore_files: Vec<PathBuf>, |
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249 _options: StatusOptions, |
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250 ) -> Result< |
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251 ( |
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252 (Vec<HgPathCow<'a>>, DirstateStatus<'a>), |
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253 Vec<PatternFileWarning>, |
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254 ), |
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255 StatusError, |
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256 > { |
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257 todo!() |
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258 } |
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259 |
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260 fn copy_map_len(&self) -> usize { |
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261 todo!() |
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262 } |
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263 |
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264 fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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265 todo!() |
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266 } |
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267 |
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268 fn copy_map_contains_key(&self, _key: &HgPath) -> bool { |
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269 todo!() |
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270 } |
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271 |
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272 fn copy_map_get(&self, _key: &HgPath) -> Option<&HgPathBuf> { |
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273 todo!() |
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274 } |
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275 |
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276 fn copy_map_remove(&mut self, _key: &HgPath) -> Option<HgPathBuf> { |
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277 todo!() |
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278 } |
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279 |
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280 fn copy_map_insert( |
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281 &mut self, |
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282 _key: HgPathBuf, |
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283 _value: HgPathBuf, |
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284 ) -> Option<HgPathBuf> { |
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285 todo!() |
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286 } |
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287 |
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288 fn len(&self) -> usize { |
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289 todo!() |
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290 } |
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291 |
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292 fn contains_key(&self, _key: &HgPath) -> bool { |
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293 todo!() |
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294 } |
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295 |
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296 fn get(&self, _key: &HgPath) -> Option<&DirstateEntry> { |
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297 todo!() |
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298 } |
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299 |
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300 fn iter(&self) -> StateMapIter<'_> { |
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301 todo!() |
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302 } |
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303 } |