Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 47109:33e5511b571a
rust: Remove DirstateMap::file_fold_map
This was a HashMap constructed on demand and then cached in the DirstateMap
struct to avoid reconstructing at the next access. However the only use is
in Python bindings converting it to a PyDict. That method in turn is wrapped
in a @cachedproperty in Python code.
This was two redudant layers of caching. This changeset removes the Rust-level
one to keep the Python dict cache, and have bindings create a PyDict by
iterating.
Differential Revision: https://phab.mercurial-scm.org/D10493
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Tue, 13 Apr 2021 17:02:58 +0200 |
parents | e3cebe96c0fc |
children | 9c6b458a08e1 |
rev | line source |
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1 use bytes_cast::BytesCast; |
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2 use std::path::PathBuf; |
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3 use std::{collections::BTreeMap, convert::TryInto}; |
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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::clear_ambiguous_mtime; |
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7 use crate::dirstate::parsers::pack_entry; |
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8 use crate::dirstate::parsers::packed_entry_size; |
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9 use crate::dirstate::parsers::parse_dirstate_entries; |
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10 use crate::dirstate::parsers::parse_dirstate_parents; |
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11 use crate::dirstate::parsers::Timestamp; |
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12 use crate::matchers::Matcher; |
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13 use crate::revlog::node::NULL_NODE; |
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14 use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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15 use crate::CopyMapIter; |
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16 use crate::DirstateEntry; |
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17 use crate::DirstateError; |
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18 use crate::DirstateMapError; |
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19 use crate::DirstateParents; |
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20 use crate::DirstateStatus; |
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21 use crate::EntryState; |
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22 use crate::HgPathCow; |
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23 use crate::PatternFileWarning; |
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24 use crate::StateMapIter; |
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25 use crate::StatusError; |
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26 use crate::StatusOptions; |
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27 |
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28 pub struct DirstateMap { |
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29 parents: Option<DirstateParents>, |
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30 dirty_parents: bool, |
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31 root: ChildNodes, |
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32 |
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33 /// Number of nodes anywhere in the tree that have `.entry.is_some()`. |
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34 nodes_with_entry_count: usize, |
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35 |
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36 /// Number of nodes anywhere in the tree that have |
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37 /// `.copy_source.is_some()`. |
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38 nodes_with_copy_source_count: usize, |
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39 } |
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40 |
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41 /// Using a plain `HgPathBuf` of the full path from the repository root as a |
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42 /// map key would also work: all paths in a given map have the same parent |
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43 /// path, so comparing full paths gives the same result as comparing base |
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44 /// names. However `BTreeMap` would waste time always re-comparing the same |
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45 /// string prefix. |
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46 type ChildNodes = BTreeMap<WithBasename<HgPathBuf>, Node>; |
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47 |
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48 /// Represents a file or a directory |
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49 #[derive(Default)] |
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50 struct Node { |
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51 /// `None` for directories |
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52 entry: Option<DirstateEntry>, |
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53 |
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54 copy_source: Option<HgPathBuf>, |
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55 |
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56 children: ChildNodes, |
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57 |
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58 /// How many (non-inclusive) descendants of this node are tracked files |
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59 tracked_descendants_count: usize, |
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60 } |
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61 |
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62 impl Node { |
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63 /// Whether this node has a `DirstateEntry` with `.state.is_tracked()` |
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64 fn is_tracked_file(&self) -> bool { |
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65 if let Some(entry) = &self.entry { |
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66 entry.state.is_tracked() |
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67 } else { |
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68 false |
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69 } |
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70 } |
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71 } |
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72 |
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73 /// `(full_path, entry, copy_source)` |
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74 type NodeDataMut<'a> = ( |
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75 &'a WithBasename<HgPathBuf>, |
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76 &'a mut Option<DirstateEntry>, |
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77 &'a mut Option<HgPathBuf>, |
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78 ); |
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79 |
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80 impl DirstateMap { |
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81 pub fn new() -> Self { |
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82 Self { |
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83 parents: None, |
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84 dirty_parents: false, |
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85 root: ChildNodes::new(), |
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86 nodes_with_entry_count: 0, |
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87 nodes_with_copy_source_count: 0, |
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88 } |
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89 } |
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90 |
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91 fn get_node(&self, path: &HgPath) -> Option<&Node> { |
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92 let mut children = &self.root; |
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93 let mut components = path.components(); |
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94 let mut component = |
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95 components.next().expect("expected at least one components"); |
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96 loop { |
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97 let child = children.get(component)?; |
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98 if let Some(next_component) = components.next() { |
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99 component = next_component; |
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100 children = &child.children; |
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101 } else { |
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102 return Some(child); |
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103 } |
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104 } |
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105 } |
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106 |
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107 /// Returns a mutable reference to the node at `path` if it exists |
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108 /// |
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109 /// This takes `root` instead of `&mut self` so that callers can mutate |
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110 /// other fields while the returned borrow is still valid |
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111 fn get_node_mut<'tree>( |
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112 root: &'tree mut ChildNodes, |
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113 path: &HgPath, |
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114 ) -> Option<&'tree mut Node> { |
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115 Self::each_and_get(root, path, |_| {}) |
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116 } |
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117 |
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118 /// Call `each` for each ancestor node of the one at `path` (not including |
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119 /// that node itself), starting from nearest the root. |
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120 /// |
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121 /// Panics (possibly after some calls to `each`) if there is no node at |
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122 /// `path`. |
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123 fn for_each_ancestor_node<'tree>( |
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124 &mut self, |
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125 path: &HgPath, |
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126 each: impl FnMut(&mut Node), |
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127 ) { |
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128 let parent = path.parent(); |
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129 if !parent.is_empty() { |
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130 Self::each_and_get(&mut self.root, parent, each) |
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131 .expect("missing dirstate node"); |
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132 } |
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133 } |
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134 |
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135 /// Common implementation detail of `get_node_mut` and |
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136 /// `for_each_ancestor_node` |
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137 fn each_and_get<'tree>( |
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138 root: &'tree mut ChildNodes, |
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139 path: &HgPath, |
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140 mut each: impl FnMut(&mut Node), |
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141 ) -> Option<&'tree mut Node> { |
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142 let mut children = root; |
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143 let mut components = path.components(); |
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144 let mut component = |
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145 components.next().expect("expected at least one components"); |
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146 loop { |
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147 let child = children.get_mut(component)?; |
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148 each(child); |
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149 if let Some(next_component) = components.next() { |
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150 component = next_component; |
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151 children = &mut child.children; |
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152 } else { |
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153 return Some(child); |
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154 } |
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155 } |
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156 } |
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157 |
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158 fn get_or_insert_node<'tree>( |
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159 root: &'tree mut ChildNodes, |
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160 path: &HgPath, |
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161 ) -> &'tree mut Node { |
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162 let mut child_nodes = root; |
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163 let mut inclusive_ancestor_paths = |
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164 WithBasename::inclusive_ancestors_of(path); |
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165 let mut ancestor_path = inclusive_ancestor_paths |
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166 .next() |
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167 .expect("expected at least one inclusive ancestor"); |
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168 loop { |
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169 // TODO: can we avoid double lookup in all cases without allocating |
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170 // an owned key in cases where the map already contains that key? |
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171 let child_node = |
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172 if child_nodes.contains_key(ancestor_path.base_name()) { |
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173 child_nodes.get_mut(ancestor_path.base_name()).unwrap() |
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174 } else { |
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175 // This is always a vacant entry, using `.entry()` lets us |
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176 // return a `&mut Node` of the newly-inserted node without |
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177 // yet another lookup. `BTreeMap::insert` doesn’t do this. |
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178 child_nodes.entry(ancestor_path.to_owned()).or_default() |
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179 }; |
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180 if let Some(next) = inclusive_ancestor_paths.next() { |
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181 ancestor_path = next; |
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182 child_nodes = &mut child_node.children; |
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183 } else { |
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184 return child_node; |
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185 } |
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186 } |
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187 } |
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188 |
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189 /// The meaning of `new_copy_source` is: |
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190 /// |
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191 /// * `Some(Some(x))`: set `Node::copy_source` to `Some(x)` |
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192 /// * `Some(None)`: set `Node::copy_source` to `None` |
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193 /// * `None`: leave `Node::copy_source` unchanged |
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194 fn add_file_node( |
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195 &mut self, |
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196 path: &HgPath, |
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197 new_entry: DirstateEntry, |
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198 new_copy_source: Option<Option<HgPathBuf>>, |
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199 ) { |
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200 let node = Self::get_or_insert_node(&mut self.root, path); |
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201 if node.entry.is_none() { |
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202 self.nodes_with_entry_count += 1 |
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203 } |
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204 if let Some(source) = &new_copy_source { |
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205 if node.copy_source.is_none() && source.is_some() { |
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206 self.nodes_with_copy_source_count += 1 |
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207 } |
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208 if node.copy_source.is_some() && source.is_none() { |
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209 self.nodes_with_copy_source_count -= 1 |
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210 } |
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211 } |
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212 let tracked_count_increment = |
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213 match (node.is_tracked_file(), new_entry.state.is_tracked()) { |
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214 (false, true) => 1, |
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215 (true, false) => -1, |
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216 _ => 0, |
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217 }; |
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218 |
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219 node.entry = Some(new_entry); |
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220 if let Some(source) = new_copy_source { |
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221 node.copy_source = source |
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222 } |
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223 // Borrow of `self.root` through `node` ends here |
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224 |
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225 match tracked_count_increment { |
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226 1 => self.for_each_ancestor_node(path, |node| { |
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227 node.tracked_descendants_count += 1 |
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228 }), |
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229 // We can’t use `+= -1` because the counter is unsigned |
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230 -1 => self.for_each_ancestor_node(path, |node| { |
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231 node.tracked_descendants_count -= 1 |
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232 }), |
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233 _ => {} |
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234 } |
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235 } |
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236 |
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237 fn iter_nodes<'a>( |
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238 &'a self, |
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239 ) -> impl Iterator<Item = (&'a WithBasename<HgPathBuf>, &'a Node)> + 'a |
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240 { |
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241 // Depth first tree traversal. |
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242 // |
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243 // If we could afford internal iteration and recursion, |
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244 // this would look like: |
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245 // |
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246 // ``` |
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247 // fn traverse_children( |
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248 // children: &ChildNodes, |
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249 // each: &mut impl FnMut(&Node), |
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250 // ) { |
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251 // for child in children.values() { |
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252 // traverse_children(&child.children, each); |
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253 // each(child); |
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254 // } |
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255 // } |
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256 // ``` |
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257 // |
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258 // However we want an external iterator and therefore can’t use the |
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259 // call stack. Use an explicit stack instead: |
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260 let mut stack = Vec::new(); |
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261 let mut iter = self.root.iter(); |
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262 std::iter::from_fn(move || { |
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263 while let Some((key, child_node)) = iter.next() { |
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264 // Pseudo-recursion |
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265 let new_iter = child_node.children.iter(); |
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266 let old_iter = std::mem::replace(&mut iter, new_iter); |
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267 stack.push((key, child_node, old_iter)); |
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268 } |
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269 // Found the end of a `children.iter()` iterator. |
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270 if let Some((key, child_node, next_iter)) = stack.pop() { |
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271 // "Return" from pseudo-recursion by restoring state from the |
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272 // explicit stack |
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273 iter = next_iter; |
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274 |
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275 Some((key, child_node)) |
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276 } else { |
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277 // Reached the bottom of the stack, we’re done |
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278 None |
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279 } |
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280 }) |
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281 } |
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282 |
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283 /// Mutable iterator for the `(entry, copy source)` of each node. |
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284 /// |
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285 /// It would not be safe to yield mutable references to nodes themeselves |
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286 /// with `-> impl Iterator<Item = &mut Node>` since child nodes are |
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287 /// reachable from their ancestor nodes, potentially creating multiple |
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288 /// `&mut` references to a given node. |
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289 fn iter_node_data_mut<'a>( |
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290 &'a mut self, |
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291 ) -> impl Iterator<Item = NodeDataMut<'a>> + 'a { |
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292 // Explict stack for pseudo-recursion, see `iter_nodes` above. |
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293 let mut stack = Vec::new(); |
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294 let mut iter = self.root.iter_mut(); |
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295 std::iter::from_fn(move || { |
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296 while let Some((key, child_node)) = iter.next() { |
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297 // Pseudo-recursion |
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298 let data = |
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299 (key, &mut child_node.entry, &mut child_node.copy_source); |
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300 let new_iter = child_node.children.iter_mut(); |
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301 let old_iter = std::mem::replace(&mut iter, new_iter); |
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302 stack.push((data, old_iter)); |
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303 } |
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304 // Found the end of a `children.values_mut()` iterator. |
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305 if let Some((data, next_iter)) = stack.pop() { |
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306 // "Return" from pseudo-recursion by restoring state from the |
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307 // explicit stack |
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308 iter = next_iter; |
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309 |
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310 Some(data) |
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311 } else { |
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312 // Reached the bottom of the stack, we’re done |
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313 None |
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314 } |
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315 }) |
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316 } |
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317 } |
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318 |
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319 impl super::dispatch::DirstateMapMethods for DirstateMap { |
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320 fn clear(&mut self) { |
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321 self.set_parents(&DirstateParents { |
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322 p1: NULL_NODE, |
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323 p2: NULL_NODE, |
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324 }); |
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325 self.root.clear(); |
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326 self.nodes_with_entry_count = 0; |
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327 self.nodes_with_copy_source_count = 0; |
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328 } |
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329 |
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330 fn add_file( |
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331 &mut self, |
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332 filename: &HgPath, |
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333 _old_state: EntryState, |
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334 entry: DirstateEntry, |
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335 ) -> Result<(), DirstateMapError> { |
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336 self.add_file_node(filename, entry, None); |
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337 Ok(()) |
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338 } |
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339 |
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340 fn remove_file( |
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341 &mut self, |
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342 filename: &HgPath, |
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343 _old_state: EntryState, |
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344 size: i32, |
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345 ) -> Result<(), DirstateMapError> { |
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346 let entry = DirstateEntry { |
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347 state: EntryState::Removed, |
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348 mode: 0, |
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349 size, |
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350 mtime: 0, |
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351 }; |
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352 self.add_file_node(filename, entry, None); |
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353 Ok(()) |
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354 } |
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355 |
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356 fn drop_file( |
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357 &mut self, |
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358 filename: &HgPath, |
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359 _old_state: EntryState, |
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360 ) -> Result<bool, DirstateMapError> { |
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361 if let Some(node) = Self::get_node_mut(&mut self.root, filename) { |
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362 let was_tracked = node.is_tracked_file(); |
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363 let had_entry = node.entry.is_some(); |
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364 let had_copy_source = node.copy_source.is_some(); |
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365 |
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366 // TODO: this leaves in the tree a "non-file" node. Should we |
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367 // remove the node instead, together with ancestor nodes for |
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368 // directories that become empty? |
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369 node.entry = None; |
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370 node.copy_source = None; |
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371 |
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372 if had_entry { |
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373 self.nodes_with_entry_count -= 1 |
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374 } |
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375 if had_copy_source { |
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376 self.nodes_with_copy_source_count -= 1 |
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377 } |
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378 if was_tracked { |
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379 self.for_each_ancestor_node(filename, |node| { |
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380 node.tracked_descendants_count -= 1 |
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381 }) |
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382 } |
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383 Ok(had_entry) |
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384 } else { |
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385 Ok(false) |
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386 } |
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387 } |
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388 |
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389 fn clear_ambiguous_times(&mut self, filenames: Vec<HgPathBuf>, now: i32) { |
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390 for filename in filenames { |
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391 if let Some(node) = Self::get_node_mut(&mut self.root, &filename) { |
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392 if let Some(entry) = node.entry.as_mut() { |
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393 clear_ambiguous_mtime(entry, now); |
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394 } |
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395 } |
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396 } |
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397 } |
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398 |
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399 fn non_normal_entries_contains(&mut self, key: &HgPath) -> bool { |
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400 self.get_node(key) |
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401 .and_then(|node| node.entry.as_ref()) |
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402 .map_or(false, DirstateEntry::is_non_normal) |
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403 } |
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404 |
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405 fn non_normal_entries_remove(&mut self, _key: &HgPath) { |
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406 // Do nothing, this `DirstateMap` does not have a separate "non normal |
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407 // entries" set that need to be kept up to date |
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408 } |
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409 |
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410 fn non_normal_or_other_parent_paths( |
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411 &mut self, |
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412 ) -> Box<dyn Iterator<Item = &HgPathBuf> + '_> { |
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413 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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414 node.entry |
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415 .as_ref() |
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416 .filter(|entry| { |
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417 entry.is_non_normal() || entry.is_from_other_parent() |
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418 }) |
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419 .map(|_| path.full_path()) |
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420 })) |
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421 } |
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422 |
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423 fn set_non_normal_other_parent_entries(&mut self, _force: bool) { |
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424 // Do nothing, this `DirstateMap` does not have a separate "non normal |
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425 // entries" and "from other parent" sets that need to be recomputed |
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426 } |
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427 |
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428 fn iter_non_normal_paths( |
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429 &mut self, |
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430 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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431 self.iter_non_normal_paths_panic() |
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432 } |
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433 |
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434 fn iter_non_normal_paths_panic( |
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435 &self, |
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436 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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437 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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438 node.entry |
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439 .as_ref() |
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440 .filter(|entry| entry.is_non_normal()) |
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441 .map(|_| path.full_path()) |
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442 })) |
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443 } |
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444 |
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445 fn iter_other_parent_paths( |
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446 &mut self, |
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447 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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448 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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449 node.entry |
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450 .as_ref() |
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451 .filter(|entry| entry.is_from_other_parent()) |
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452 .map(|_| path.full_path()) |
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453 })) |
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454 } |
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455 |
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456 fn has_tracked_dir( |
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457 &mut self, |
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458 directory: &HgPath, |
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459 ) -> Result<bool, DirstateMapError> { |
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460 if let Some(node) = self.get_node(directory) { |
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461 // A node without a `DirstateEntry` was created to hold child |
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462 // nodes, and is therefore a directory. |
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463 Ok(node.entry.is_none() && node.tracked_descendants_count > 0) |
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464 } else { |
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465 Ok(false) |
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466 } |
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467 } |
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468 |
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469 fn has_dir( |
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470 &mut self, |
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471 directory: &HgPath, |
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472 ) -> Result<bool, DirstateMapError> { |
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473 if let Some(node) = self.get_node(directory) { |
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474 // A node without a `DirstateEntry` was created to hold child |
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475 // nodes, and is therefore a directory. |
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476 Ok(node.entry.is_none()) |
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477 } else { |
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478 Ok(false) |
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479 } |
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480 } |
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481 |
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482 fn parents( |
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483 &mut self, |
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484 file_contents: &[u8], |
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485 ) -> Result<&DirstateParents, DirstateError> { |
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486 if self.parents.is_none() { |
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487 let parents = if !file_contents.is_empty() { |
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488 parse_dirstate_parents(file_contents)?.clone() |
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489 } else { |
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490 DirstateParents { |
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491 p1: NULL_NODE, |
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492 p2: NULL_NODE, |
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493 } |
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494 }; |
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495 self.parents = Some(parents); |
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496 } |
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497 Ok(self.parents.as_ref().unwrap()) |
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498 } |
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499 |
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500 fn set_parents(&mut self, parents: &DirstateParents) { |
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501 self.parents = Some(parents.clone()); |
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502 self.dirty_parents = true; |
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503 } |
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504 |
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505 fn read<'a>( |
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506 &mut self, |
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507 file_contents: &'a [u8], |
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508 ) -> Result<Option<&'a DirstateParents>, DirstateError> { |
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509 if file_contents.is_empty() { |
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510 return Ok(None); |
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511 } |
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512 |
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513 let parents = parse_dirstate_entries( |
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514 file_contents, |
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515 |path, entry, copy_source| { |
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516 self.add_file_node( |
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517 path, |
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518 *entry, |
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519 Some(copy_source.map(HgPath::to_owned)), |
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520 ) |
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521 }, |
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522 )?; |
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523 |
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524 if !self.dirty_parents { |
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525 self.set_parents(parents); |
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526 } |
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527 |
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528 Ok(Some(parents)) |
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529 } |
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530 |
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531 fn pack( |
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532 &mut self, |
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533 parents: DirstateParents, |
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534 now: Timestamp, |
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535 ) -> Result<Vec<u8>, DirstateError> { |
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536 // Optizimation (to be measured?): pre-compute size to avoid `Vec` |
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537 // reallocations |
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538 let mut size = parents.as_bytes().len(); |
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539 for (path, node) in self.iter_nodes() { |
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540 if node.entry.is_some() { |
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541 size += packed_entry_size( |
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542 path.full_path(), |
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543 node.copy_source.as_ref(), |
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544 ) |
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545 } |
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546 } |
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547 |
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548 let mut packed = Vec::with_capacity(size); |
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549 packed.extend(parents.as_bytes()); |
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550 |
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551 let now: i32 = now.0.try_into().expect("time overflow"); |
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552 for (path, opt_entry, copy_source) in self.iter_node_data_mut() { |
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553 if let Some(entry) = opt_entry { |
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554 clear_ambiguous_mtime(entry, now); |
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555 pack_entry( |
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556 path.full_path(), |
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557 entry, |
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558 copy_source.as_ref(), |
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559 &mut packed, |
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560 ); |
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561 } |
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562 } |
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563 self.dirty_parents = false; |
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564 Ok(packed) |
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565 } |
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566 |
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567 fn set_all_dirs(&mut self) -> Result<(), DirstateMapError> { |
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568 // Do nothing, this `DirstateMap` does not a separate `all_dirs` that |
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569 // needs to be recomputed |
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570 Ok(()) |
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571 } |
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572 |
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573 fn set_dirs(&mut self) -> Result<(), DirstateMapError> { |
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574 // Do nothing, this `DirstateMap` does not a separate `dirs` that needs |
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575 // to be recomputed |
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576 Ok(()) |
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577 } |
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578 |
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579 fn status<'a>( |
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580 &'a self, |
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581 _matcher: &'a (dyn Matcher + Sync), |
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582 _root_dir: PathBuf, |
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583 _ignore_files: Vec<PathBuf>, |
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584 _options: StatusOptions, |
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585 ) -> Result< |
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586 ( |
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587 (Vec<HgPathCow<'a>>, DirstateStatus<'a>), |
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588 Vec<PatternFileWarning>, |
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589 ), |
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590 StatusError, |
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591 > { |
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592 todo!() |
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593 } |
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594 |
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595 fn copy_map_len(&self) -> usize { |
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596 self.nodes_with_copy_source_count |
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597 } |
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598 |
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599 fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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600 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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601 node.copy_source |
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602 .as_ref() |
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603 .map(|copy_source| (path.full_path(), copy_source)) |
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604 })) |
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605 } |
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606 |
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607 fn copy_map_contains_key(&self, key: &HgPath) -> bool { |
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608 if let Some(node) = self.get_node(key) { |
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609 node.copy_source.is_some() |
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610 } else { |
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611 false |
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612 } |
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613 } |
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614 |
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615 fn copy_map_get(&self, key: &HgPath) -> Option<&HgPathBuf> { |
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616 self.get_node(key)?.copy_source.as_ref() |
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617 } |
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618 |
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619 fn copy_map_remove(&mut self, key: &HgPath) -> Option<HgPathBuf> { |
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620 let count = &mut self.nodes_with_copy_source_count; |
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621 Self::get_node_mut(&mut self.root, key).and_then(|node| { |
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622 if node.copy_source.is_some() { |
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623 *count -= 1 |
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624 } |
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625 node.copy_source.take() |
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626 }) |
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627 } |
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628 |
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629 fn copy_map_insert( |
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630 &mut self, |
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631 key: HgPathBuf, |
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632 value: HgPathBuf, |
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633 ) -> Option<HgPathBuf> { |
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634 let node = Self::get_or_insert_node(&mut self.root, &key); |
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635 if node.copy_source.is_none() { |
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636 self.nodes_with_copy_source_count += 1 |
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637 } |
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638 node.copy_source.replace(value) |
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639 } |
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640 |
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641 fn len(&self) -> usize { |
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642 self.nodes_with_entry_count |
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643 } |
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644 |
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645 fn contains_key(&self, key: &HgPath) -> bool { |
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646 self.get(key).is_some() |
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647 } |
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648 |
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649 fn get(&self, key: &HgPath) -> Option<&DirstateEntry> { |
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650 self.get_node(key)?.entry.as_ref() |
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651 } |
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652 |
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653 fn iter(&self) -> StateMapIter<'_> { |
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654 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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655 node.entry.as_ref().map(|entry| (path.full_path(), entry)) |
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656 })) |
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657 } |
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658 } |