Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 47118:c92e63762573
dirstate-tree: Add #[timed] attribute to `status` and `DirstateMap::read`
When running with a `RUST_LOG=trace` environment variable, the `micro_timer`
crate prints the duration taken by each call to functions with that attribute.
Differential Revision: https://phab.mercurial-scm.org/D10552
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Tue, 27 Apr 2021 17:49:38 +0200 |
parents | 04bcba539c96 |
children | 15395fd8ab28 |
rev | line source |
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1 use bytes_cast::BytesCast; |
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2 use micro_timer::timed; |
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3 use std::path::PathBuf; |
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4 use std::{collections::BTreeMap, convert::TryInto}; |
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5 |
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6 use super::path_with_basename::WithBasename; |
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7 use crate::dirstate::parsers::clear_ambiguous_mtime; |
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8 use crate::dirstate::parsers::pack_entry; |
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9 use crate::dirstate::parsers::packed_entry_size; |
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10 use crate::dirstate::parsers::parse_dirstate_entries; |
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11 use crate::dirstate::parsers::parse_dirstate_parents; |
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12 use crate::dirstate::parsers::Timestamp; |
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13 use crate::matchers::Matcher; |
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14 use crate::revlog::node::NULL_NODE; |
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15 use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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16 use crate::CopyMapIter; |
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17 use crate::DirstateEntry; |
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18 use crate::DirstateError; |
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19 use crate::DirstateMapError; |
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20 use crate::DirstateParents; |
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21 use crate::DirstateStatus; |
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22 use crate::EntryState; |
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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 pub(super) 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 pub(super) 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 pub(super) struct Node { |
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51 /// `None` for directories |
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52 pub(super) entry: Option<DirstateEntry>, |
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53 |
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54 pub(super) copy_source: Option<HgPathBuf>, |
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55 |
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56 pub(super) 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 pub(super) fn state(&self) -> Option<EntryState> { |
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73 self.entry.as_ref().map(|entry| entry.state) |
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74 } |
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75 } |
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76 |
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77 /// `(full_path, entry, copy_source)` |
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78 type NodeDataMut<'a> = ( |
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79 &'a WithBasename<HgPathBuf>, |
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80 &'a mut Option<DirstateEntry>, |
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81 &'a mut Option<HgPathBuf>, |
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82 ); |
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83 |
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84 impl DirstateMap { |
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85 pub fn new() -> Self { |
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86 Self { |
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87 parents: None, |
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88 dirty_parents: false, |
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89 root: ChildNodes::new(), |
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90 nodes_with_entry_count: 0, |
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91 nodes_with_copy_source_count: 0, |
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92 } |
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93 } |
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94 |
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95 fn get_node(&self, path: &HgPath) -> Option<&Node> { |
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96 let mut children = &self.root; |
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97 let mut components = path.components(); |
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98 let mut component = |
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99 components.next().expect("expected at least one components"); |
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100 loop { |
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101 let child = children.get(component)?; |
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102 if let Some(next_component) = components.next() { |
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103 component = next_component; |
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104 children = &child.children; |
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105 } else { |
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106 return Some(child); |
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107 } |
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108 } |
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109 } |
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110 |
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111 /// Returns a mutable reference to the node at `path` if it exists |
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112 /// |
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113 /// This takes `root` instead of `&mut self` so that callers can mutate |
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114 /// other fields while the returned borrow is still valid |
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115 fn get_node_mut<'tree>( |
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116 root: &'tree mut ChildNodes, |
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117 path: &HgPath, |
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118 ) -> Option<&'tree mut Node> { |
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119 Self::each_and_get(root, path, |_| {}) |
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120 } |
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121 |
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122 /// Call `each` for each ancestor node of the one at `path` (not including |
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123 /// that node itself), starting from nearest the root. |
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124 /// |
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125 /// Panics (possibly after some calls to `each`) if there is no node at |
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126 /// `path`. |
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127 fn for_each_ancestor_node<'tree>( |
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128 &mut self, |
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129 path: &HgPath, |
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130 each: impl FnMut(&mut Node), |
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131 ) { |
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132 let parent = path.parent(); |
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133 if !parent.is_empty() { |
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134 Self::each_and_get(&mut self.root, parent, each) |
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135 .expect("missing dirstate node"); |
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136 } |
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137 } |
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138 |
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139 /// Common implementation detail of `get_node_mut` and |
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140 /// `for_each_ancestor_node` |
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141 fn each_and_get<'tree>( |
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142 root: &'tree mut ChildNodes, |
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143 path: &HgPath, |
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144 mut each: impl FnMut(&mut Node), |
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145 ) -> Option<&'tree mut Node> { |
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146 let mut children = root; |
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147 let mut components = path.components(); |
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148 let mut component = |
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149 components.next().expect("expected at least one components"); |
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150 loop { |
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151 let child = children.get_mut(component)?; |
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152 each(child); |
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153 if let Some(next_component) = components.next() { |
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154 component = next_component; |
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155 children = &mut child.children; |
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156 } else { |
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157 return Some(child); |
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158 } |
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159 } |
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160 } |
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161 |
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162 fn get_or_insert_node<'tree>( |
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163 root: &'tree mut ChildNodes, |
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164 path: &HgPath, |
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165 ) -> &'tree mut Node { |
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166 let mut child_nodes = root; |
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167 let mut inclusive_ancestor_paths = |
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168 WithBasename::inclusive_ancestors_of(path); |
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169 let mut ancestor_path = inclusive_ancestor_paths |
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170 .next() |
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171 .expect("expected at least one inclusive ancestor"); |
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172 loop { |
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173 // TODO: can we avoid allocating an owned key in cases where the |
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174 // map already contains that key, without introducing double |
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175 // lookup? |
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176 let child_node = |
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177 child_nodes.entry(ancestor_path.to_owned()).or_default(); |
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178 if let Some(next) = inclusive_ancestor_paths.next() { |
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179 ancestor_path = next; |
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180 child_nodes = &mut child_node.children; |
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181 } else { |
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182 return child_node; |
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183 } |
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184 } |
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185 } |
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186 |
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187 /// The meaning of `new_copy_source` is: |
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188 /// |
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189 /// * `Some(Some(x))`: set `Node::copy_source` to `Some(x)` |
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190 /// * `Some(None)`: set `Node::copy_source` to `None` |
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191 /// * `None`: leave `Node::copy_source` unchanged |
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192 fn add_file_node( |
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193 &mut self, |
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194 path: &HgPath, |
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195 new_entry: DirstateEntry, |
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196 new_copy_source: Option<Option<HgPathBuf>>, |
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197 ) { |
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198 let node = Self::get_or_insert_node(&mut self.root, path); |
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199 if node.entry.is_none() { |
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200 self.nodes_with_entry_count += 1 |
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201 } |
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202 if let Some(source) = &new_copy_source { |
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203 if node.copy_source.is_none() && source.is_some() { |
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204 self.nodes_with_copy_source_count += 1 |
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205 } |
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206 if node.copy_source.is_some() && source.is_none() { |
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207 self.nodes_with_copy_source_count -= 1 |
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208 } |
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209 } |
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210 let tracked_count_increment = |
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211 match (node.is_tracked_file(), new_entry.state.is_tracked()) { |
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212 (false, true) => 1, |
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213 (true, false) => -1, |
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214 _ => 0, |
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215 }; |
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216 |
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217 node.entry = Some(new_entry); |
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218 if let Some(source) = new_copy_source { |
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219 node.copy_source = source |
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220 } |
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221 // Borrow of `self.root` through `node` ends here |
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222 |
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223 match tracked_count_increment { |
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224 1 => self.for_each_ancestor_node(path, |node| { |
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225 node.tracked_descendants_count += 1 |
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226 }), |
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227 // We can’t use `+= -1` because the counter is unsigned |
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228 -1 => self.for_each_ancestor_node(path, |node| { |
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229 node.tracked_descendants_count -= 1 |
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230 }), |
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231 _ => {} |
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232 } |
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233 } |
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234 |
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235 fn iter_nodes<'a>( |
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236 &'a self, |
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237 ) -> impl Iterator<Item = (&'a WithBasename<HgPathBuf>, &'a Node)> + 'a |
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238 { |
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239 // Depth first tree traversal. |
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240 // |
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241 // If we could afford internal iteration and recursion, |
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242 // this would look like: |
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243 // |
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244 // ``` |
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245 // fn traverse_children( |
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246 // children: &ChildNodes, |
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247 // each: &mut impl FnMut(&Node), |
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248 // ) { |
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249 // for child in children.values() { |
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250 // traverse_children(&child.children, each); |
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251 // each(child); |
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252 // } |
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253 // } |
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254 // ``` |
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255 // |
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256 // However we want an external iterator and therefore can’t use the |
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257 // call stack. Use an explicit stack instead: |
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258 let mut stack = Vec::new(); |
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259 let mut iter = self.root.iter(); |
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260 std::iter::from_fn(move || { |
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261 while let Some((key, child_node)) = iter.next() { |
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262 // Pseudo-recursion |
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263 let new_iter = child_node.children.iter(); |
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264 let old_iter = std::mem::replace(&mut iter, new_iter); |
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265 stack.push((key, child_node, old_iter)); |
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266 } |
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267 // Found the end of a `children.iter()` iterator. |
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268 if let Some((key, child_node, next_iter)) = stack.pop() { |
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269 // "Return" from pseudo-recursion by restoring state from the |
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270 // explicit stack |
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271 iter = next_iter; |
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272 |
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273 Some((key, child_node)) |
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274 } else { |
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275 // Reached the bottom of the stack, we’re done |
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276 None |
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277 } |
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278 }) |
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279 } |
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280 |
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281 /// Mutable iterator for the `(entry, copy source)` of each node. |
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282 /// |
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283 /// It would not be safe to yield mutable references to nodes themeselves |
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284 /// with `-> impl Iterator<Item = &mut Node>` since child nodes are |
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285 /// reachable from their ancestor nodes, potentially creating multiple |
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286 /// `&mut` references to a given node. |
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287 fn iter_node_data_mut<'a>( |
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288 &'a mut self, |
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289 ) -> impl Iterator<Item = NodeDataMut<'a>> + 'a { |
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290 // Explict stack for pseudo-recursion, see `iter_nodes` above. |
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291 let mut stack = Vec::new(); |
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292 let mut iter = self.root.iter_mut(); |
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293 std::iter::from_fn(move || { |
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294 while let Some((key, child_node)) = iter.next() { |
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295 // Pseudo-recursion |
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296 let data = |
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297 (key, &mut child_node.entry, &mut child_node.copy_source); |
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298 let new_iter = child_node.children.iter_mut(); |
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299 let old_iter = std::mem::replace(&mut iter, new_iter); |
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300 stack.push((data, old_iter)); |
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301 } |
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302 // Found the end of a `children.values_mut()` iterator. |
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303 if let Some((data, next_iter)) = stack.pop() { |
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304 // "Return" from pseudo-recursion by restoring state from the |
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305 // explicit stack |
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306 iter = next_iter; |
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307 |
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308 Some(data) |
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309 } else { |
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310 // Reached the bottom of the stack, we’re done |
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311 None |
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312 } |
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313 }) |
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314 } |
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315 } |
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316 |
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317 impl super::dispatch::DirstateMapMethods for DirstateMap { |
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318 fn clear(&mut self) { |
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319 self.set_parents(&DirstateParents { |
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320 p1: NULL_NODE, |
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321 p2: NULL_NODE, |
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322 }); |
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323 self.root.clear(); |
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324 self.nodes_with_entry_count = 0; |
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325 self.nodes_with_copy_source_count = 0; |
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326 } |
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327 |
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328 fn add_file( |
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329 &mut self, |
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330 filename: &HgPath, |
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331 _old_state: EntryState, |
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332 entry: DirstateEntry, |
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333 ) -> Result<(), DirstateMapError> { |
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334 self.add_file_node(filename, entry, None); |
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335 Ok(()) |
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336 } |
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337 |
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338 fn remove_file( |
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339 &mut self, |
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340 filename: &HgPath, |
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341 _old_state: EntryState, |
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342 size: i32, |
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343 ) -> Result<(), DirstateMapError> { |
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344 let entry = DirstateEntry { |
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345 state: EntryState::Removed, |
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346 mode: 0, |
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347 size, |
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348 mtime: 0, |
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349 }; |
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350 self.add_file_node(filename, entry, None); |
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351 Ok(()) |
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352 } |
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353 |
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354 fn drop_file( |
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355 &mut self, |
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356 filename: &HgPath, |
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357 _old_state: EntryState, |
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358 ) -> Result<bool, DirstateMapError> { |
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359 if let Some(node) = Self::get_node_mut(&mut self.root, filename) { |
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360 let was_tracked = node.is_tracked_file(); |
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361 let had_entry = node.entry.is_some(); |
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362 let had_copy_source = node.copy_source.is_some(); |
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363 |
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364 // TODO: this leaves in the tree a "non-file" node. Should we |
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365 // remove the node instead, together with ancestor nodes for |
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366 // directories that become empty? |
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367 node.entry = None; |
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368 node.copy_source = None; |
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369 |
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370 if had_entry { |
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371 self.nodes_with_entry_count -= 1 |
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372 } |
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373 if had_copy_source { |
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374 self.nodes_with_copy_source_count -= 1 |
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375 } |
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376 if was_tracked { |
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377 self.for_each_ancestor_node(filename, |node| { |
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378 node.tracked_descendants_count -= 1 |
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379 }) |
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380 } |
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381 Ok(had_entry) |
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382 } else { |
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383 Ok(false) |
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384 } |
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385 } |
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386 |
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387 fn clear_ambiguous_times(&mut self, filenames: Vec<HgPathBuf>, now: i32) { |
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388 for filename in filenames { |
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389 if let Some(node) = Self::get_node_mut(&mut self.root, &filename) { |
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390 if let Some(entry) = node.entry.as_mut() { |
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391 clear_ambiguous_mtime(entry, now); |
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392 } |
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393 } |
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394 } |
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395 } |
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396 |
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397 fn non_normal_entries_contains(&mut self, key: &HgPath) -> bool { |
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398 self.get_node(key) |
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399 .and_then(|node| node.entry.as_ref()) |
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400 .map_or(false, DirstateEntry::is_non_normal) |
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401 } |
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402 |
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403 fn non_normal_entries_remove(&mut self, _key: &HgPath) { |
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404 // Do nothing, this `DirstateMap` does not have a separate "non normal |
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405 // entries" set that need to be kept up to date |
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406 } |
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407 |
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408 fn non_normal_or_other_parent_paths( |
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409 &mut self, |
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410 ) -> Box<dyn Iterator<Item = &HgPathBuf> + '_> { |
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411 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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412 node.entry |
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413 .as_ref() |
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414 .filter(|entry| { |
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415 entry.is_non_normal() || entry.is_from_other_parent() |
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416 }) |
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417 .map(|_| path.full_path()) |
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418 })) |
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419 } |
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420 |
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421 fn set_non_normal_other_parent_entries(&mut self, _force: bool) { |
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422 // Do nothing, this `DirstateMap` does not have a separate "non normal |
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423 // entries" and "from other parent" sets that need to be recomputed |
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424 } |
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425 |
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426 fn iter_non_normal_paths( |
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427 &mut self, |
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428 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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429 self.iter_non_normal_paths_panic() |
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430 } |
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431 |
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432 fn iter_non_normal_paths_panic( |
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433 &self, |
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434 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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435 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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436 node.entry |
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437 .as_ref() |
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438 .filter(|entry| entry.is_non_normal()) |
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439 .map(|_| path.full_path()) |
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440 })) |
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441 } |
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442 |
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443 fn iter_other_parent_paths( |
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444 &mut self, |
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445 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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446 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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447 node.entry |
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448 .as_ref() |
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449 .filter(|entry| entry.is_from_other_parent()) |
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450 .map(|_| path.full_path()) |
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451 })) |
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452 } |
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453 |
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454 fn has_tracked_dir( |
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455 &mut self, |
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456 directory: &HgPath, |
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457 ) -> Result<bool, DirstateMapError> { |
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458 if let Some(node) = self.get_node(directory) { |
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459 // A node without a `DirstateEntry` was created to hold child |
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460 // nodes, and is therefore a directory. |
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461 Ok(node.entry.is_none() && node.tracked_descendants_count > 0) |
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462 } else { |
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463 Ok(false) |
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464 } |
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465 } |
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466 |
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467 fn has_dir( |
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468 &mut self, |
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469 directory: &HgPath, |
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470 ) -> Result<bool, DirstateMapError> { |
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471 if let Some(node) = self.get_node(directory) { |
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472 // A node without a `DirstateEntry` was created to hold child |
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473 // nodes, and is therefore a directory. |
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474 Ok(node.entry.is_none()) |
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475 } else { |
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476 Ok(false) |
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477 } |
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478 } |
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479 |
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480 fn parents( |
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481 &mut self, |
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482 file_contents: &[u8], |
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483 ) -> Result<&DirstateParents, DirstateError> { |
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484 if self.parents.is_none() { |
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485 let parents = if !file_contents.is_empty() { |
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486 parse_dirstate_parents(file_contents)?.clone() |
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487 } else { |
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488 DirstateParents { |
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489 p1: NULL_NODE, |
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490 p2: NULL_NODE, |
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491 } |
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492 }; |
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493 self.parents = Some(parents); |
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494 } |
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495 Ok(self.parents.as_ref().unwrap()) |
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496 } |
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497 |
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498 fn set_parents(&mut self, parents: &DirstateParents) { |
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499 self.parents = Some(parents.clone()); |
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500 self.dirty_parents = true; |
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501 } |
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502 |
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503 #[timed] |
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504 fn read<'a>( |
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505 &mut self, |
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506 file_contents: &'a [u8], |
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507 ) -> Result<Option<&'a DirstateParents>, DirstateError> { |
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508 if file_contents.is_empty() { |
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509 return Ok(None); |
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510 } |
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511 |
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512 let parents = parse_dirstate_entries( |
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513 file_contents, |
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514 |path, entry, copy_source| { |
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515 self.add_file_node( |
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516 path, |
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517 *entry, |
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518 Some(copy_source.map(HgPath::to_owned)), |
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519 ) |
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520 }, |
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521 )?; |
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522 |
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523 if !self.dirty_parents { |
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524 self.set_parents(parents); |
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525 } |
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526 |
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527 Ok(Some(parents)) |
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528 } |
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529 |
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530 fn pack( |
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531 &mut self, |
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532 parents: DirstateParents, |
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533 now: Timestamp, |
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534 ) -> Result<Vec<u8>, DirstateError> { |
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535 // Optizimation (to be measured?): pre-compute size to avoid `Vec` |
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536 // reallocations |
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537 let mut size = parents.as_bytes().len(); |
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538 for (path, node) in self.iter_nodes() { |
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539 if node.entry.is_some() { |
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540 size += packed_entry_size( |
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541 path.full_path(), |
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542 node.copy_source.as_ref(), |
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543 ) |
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544 } |
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545 } |
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546 |
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547 let mut packed = Vec::with_capacity(size); |
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548 packed.extend(parents.as_bytes()); |
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549 |
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550 let now: i32 = now.0.try_into().expect("time overflow"); |
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551 for (path, opt_entry, copy_source) in self.iter_node_data_mut() { |
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552 if let Some(entry) = opt_entry { |
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553 clear_ambiguous_mtime(entry, now); |
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554 pack_entry( |
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555 path.full_path(), |
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556 entry, |
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557 copy_source.as_ref(), |
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558 &mut packed, |
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559 ); |
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560 } |
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561 } |
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562 self.dirty_parents = false; |
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563 Ok(packed) |
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564 } |
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565 |
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566 fn set_all_dirs(&mut self) -> Result<(), DirstateMapError> { |
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567 // Do nothing, this `DirstateMap` does not a separate `all_dirs` that |
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568 // needs to be recomputed |
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569 Ok(()) |
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570 } |
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571 |
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572 fn set_dirs(&mut self) -> Result<(), DirstateMapError> { |
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573 // Do nothing, this `DirstateMap` does not a separate `dirs` that needs |
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574 // to be recomputed |
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575 Ok(()) |
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576 } |
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577 |
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578 fn status<'a>( |
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579 &'a mut self, |
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580 matcher: &'a (dyn Matcher + Sync), |
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581 root_dir: PathBuf, |
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582 ignore_files: Vec<PathBuf>, |
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583 options: StatusOptions, |
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584 ) -> Result<(DirstateStatus<'a>, Vec<PatternFileWarning>), StatusError> |
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585 { |
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586 super::status::status(self, matcher, root_dir, ignore_files, options) |
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587 } |
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588 |
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589 fn copy_map_len(&self) -> usize { |
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590 self.nodes_with_copy_source_count |
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591 } |
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592 |
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593 fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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594 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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595 node.copy_source |
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596 .as_ref() |
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597 .map(|copy_source| (path.full_path(), copy_source)) |
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598 })) |
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599 } |
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600 |
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601 fn copy_map_contains_key(&self, key: &HgPath) -> bool { |
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602 if let Some(node) = self.get_node(key) { |
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603 node.copy_source.is_some() |
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604 } else { |
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605 false |
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606 } |
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607 } |
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608 |
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609 fn copy_map_get(&self, key: &HgPath) -> Option<&HgPathBuf> { |
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610 self.get_node(key)?.copy_source.as_ref() |
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611 } |
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612 |
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613 fn copy_map_remove(&mut self, key: &HgPath) -> Option<HgPathBuf> { |
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614 let count = &mut self.nodes_with_copy_source_count; |
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615 Self::get_node_mut(&mut self.root, key).and_then(|node| { |
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616 if node.copy_source.is_some() { |
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617 *count -= 1 |
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618 } |
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619 node.copy_source.take() |
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620 }) |
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621 } |
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622 |
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623 fn copy_map_insert( |
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624 &mut self, |
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625 key: HgPathBuf, |
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626 value: HgPathBuf, |
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627 ) -> Option<HgPathBuf> { |
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628 let node = Self::get_or_insert_node(&mut self.root, &key); |
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629 if node.copy_source.is_none() { |
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630 self.nodes_with_copy_source_count += 1 |
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631 } |
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632 node.copy_source.replace(value) |
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633 } |
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634 |
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635 fn len(&self) -> usize { |
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636 self.nodes_with_entry_count |
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637 } |
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638 |
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639 fn contains_key(&self, key: &HgPath) -> bool { |
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640 self.get(key).is_some() |
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641 } |
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642 |
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643 fn get(&self, key: &HgPath) -> Option<&DirstateEntry> { |
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644 self.get_node(key)?.entry.as_ref() |
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645 } |
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646 |
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647 fn iter(&self) -> StateMapIter<'_> { |
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648 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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649 node.entry.as_ref().map(|entry| (path.full_path(), entry)) |
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650 })) |
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651 } |
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652 } |