Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 47102:d6c94ca40863
dirstate-tree: Serialize to disk
The existing `pack_dirstate` function relies on implementation details
of `DirstateMap`, so extract some parts of it as separate functions
for us in the tree-based `DirstateMap`.
The `bytes-cast` crate is updated to a version that has an `as_bytes` method,
not just `from_bytes`:
https://docs.rs/bytes-cast/0.2.0/bytes_cast/trait.BytesCast.html#method.as_bytes
Drive-by refactor `clear_ambiguous_times` which does part of the same thing.
Differential Revision: https://phab.mercurial-scm.org/D10486
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 12 Apr 2021 14:21:47 +0200 |
parents | 5d62243c7732 |
children | 214ae40e136b |
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::FastHashMap; |
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23 use crate::HgPathCow; |
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24 use crate::PatternFileWarning; |
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25 use crate::StateMapIter; |
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26 use crate::StatusError; |
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27 use crate::StatusOptions; |
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28 |
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29 pub struct DirstateMap { |
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30 parents: Option<DirstateParents>, |
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31 dirty_parents: bool, |
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32 root: ChildNodes, |
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33 } |
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34 |
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35 /// Using a plain `HgPathBuf` of the full path from the repository root as a |
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36 /// map key would also work: all paths in a given map have the same parent |
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37 /// path, so comparing full paths gives the same result as comparing base |
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38 /// names. However `BTreeMap` would waste time always re-comparing the same |
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39 /// string prefix. |
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40 type ChildNodes = BTreeMap<WithBasename<HgPathBuf>, Node>; |
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41 |
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42 #[derive(Default)] |
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43 struct Node { |
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44 entry: Option<DirstateEntry>, |
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45 copy_source: Option<HgPathBuf>, |
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46 children: ChildNodes, |
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47 } |
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48 |
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49 /// `(full_path, entry, copy_source)` |
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50 type NodeDataMut<'a> = ( |
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51 &'a WithBasename<HgPathBuf>, |
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52 &'a mut Option<DirstateEntry>, |
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53 &'a mut Option<HgPathBuf>, |
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54 ); |
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55 |
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56 impl DirstateMap { |
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57 pub fn new() -> Self { |
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58 Self { |
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59 parents: None, |
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60 dirty_parents: false, |
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61 root: ChildNodes::new(), |
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62 } |
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63 } |
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64 |
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65 fn get_node(&self, path: &HgPath) -> Option<&Node> { |
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66 let mut children = &self.root; |
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67 let mut components = path.components(); |
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68 let mut component = |
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69 components.next().expect("expected at least one components"); |
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70 loop { |
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71 let child = children.get(component)?; |
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72 if let Some(next_component) = components.next() { |
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73 component = next_component; |
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74 children = &child.children; |
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75 } else { |
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76 return Some(child); |
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77 } |
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78 } |
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79 } |
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80 |
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81 fn get_or_insert_node(&mut self, path: &HgPath) -> &mut Node { |
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82 let mut child_nodes = &mut self.root; |
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83 let mut inclusive_ancestor_paths = |
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84 WithBasename::inclusive_ancestors_of(path); |
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85 let mut ancestor_path = inclusive_ancestor_paths |
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86 .next() |
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87 .expect("expected at least one inclusive ancestor"); |
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88 loop { |
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89 // TODO: can we avoid double lookup in all cases without allocating |
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90 // an owned key in cases where the map already contains that key? |
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91 let child_node = |
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92 if child_nodes.contains_key(ancestor_path.base_name()) { |
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93 child_nodes.get_mut(ancestor_path.base_name()).unwrap() |
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94 } else { |
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95 // This is always a vacant entry, using `.entry()` lets us |
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96 // return a `&mut Node` of the newly-inserted node without |
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97 // yet another lookup. `BTreeMap::insert` doesn’t do this. |
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98 child_nodes.entry(ancestor_path.to_owned()).or_default() |
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99 }; |
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100 if let Some(next) = inclusive_ancestor_paths.next() { |
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101 ancestor_path = next; |
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102 child_nodes = &mut child_node.children; |
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103 } else { |
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104 return child_node; |
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105 } |
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106 } |
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107 } |
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108 |
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109 fn iter_nodes<'a>( |
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110 &'a self, |
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111 ) -> impl Iterator<Item = (&'a WithBasename<HgPathBuf>, &'a Node)> + 'a |
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112 { |
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113 // Depth first tree traversal. |
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114 // |
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115 // If we could afford internal iteration and recursion, |
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116 // this would look like: |
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117 // |
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118 // ``` |
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119 // fn traverse_children( |
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120 // children: &ChildNodes, |
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121 // each: &mut impl FnMut(&Node), |
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122 // ) { |
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123 // for child in children.values() { |
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124 // traverse_children(&child.children, each); |
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125 // each(child); |
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126 // } |
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127 // } |
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128 // ``` |
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129 // |
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130 // However we want an external iterator and therefore can’t use the |
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131 // call stack. Use an explicit stack instead: |
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132 let mut stack = Vec::new(); |
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133 let mut iter = self.root.iter(); |
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134 std::iter::from_fn(move || { |
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135 while let Some((key, child_node)) = iter.next() { |
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136 // Pseudo-recursion |
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137 let new_iter = child_node.children.iter(); |
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138 let old_iter = std::mem::replace(&mut iter, new_iter); |
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139 stack.push((key, child_node, old_iter)); |
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140 } |
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141 // Found the end of a `children.iter()` iterator. |
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142 if let Some((key, child_node, next_iter)) = stack.pop() { |
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143 // "Return" from pseudo-recursion by restoring state from the |
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144 // explicit stack |
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145 iter = next_iter; |
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146 |
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147 Some((key, child_node)) |
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148 } else { |
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149 // Reached the bottom of the stack, we’re done |
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150 None |
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151 } |
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152 }) |
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153 } |
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154 |
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155 /// Mutable iterator for the `(entry, copy source)` of each node. |
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156 /// |
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157 /// It would not be safe to yield mutable references to nodes themeselves |
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158 /// with `-> impl Iterator<Item = &mut Node>` since child nodes are |
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159 /// reachable from their ancestor nodes, potentially creating multiple |
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160 /// `&mut` references to a given node. |
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161 fn iter_node_data_mut<'a>( |
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162 &'a mut self, |
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163 ) -> impl Iterator<Item = NodeDataMut<'a>> + 'a { |
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164 // Explict stack for pseudo-recursion, see `iter_nodes` above. |
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165 let mut stack = Vec::new(); |
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166 let mut iter = self.root.iter_mut(); |
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167 std::iter::from_fn(move || { |
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168 while let Some((key, child_node)) = iter.next() { |
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169 // Pseudo-recursion |
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170 let data = |
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171 (key, &mut child_node.entry, &mut child_node.copy_source); |
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172 let new_iter = child_node.children.iter_mut(); |
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173 let old_iter = std::mem::replace(&mut iter, new_iter); |
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174 stack.push((data, old_iter)); |
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175 } |
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176 // Found the end of a `children.values_mut()` iterator. |
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177 if let Some((data, next_iter)) = stack.pop() { |
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178 // "Return" from pseudo-recursion by restoring state from the |
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179 // explicit stack |
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180 iter = next_iter; |
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181 |
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182 Some(data) |
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183 } else { |
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184 // Reached the bottom of the stack, we’re done |
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185 None |
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186 } |
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187 }) |
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188 } |
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189 } |
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190 |
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191 impl super::dispatch::DirstateMapMethods for DirstateMap { |
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192 fn clear(&mut self) { |
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193 self.set_parents(&DirstateParents { |
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194 p1: NULL_NODE, |
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195 p2: NULL_NODE, |
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196 }); |
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197 self.root.clear() |
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198 } |
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199 |
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200 fn add_file( |
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201 &mut self, |
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202 _filename: &HgPath, |
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203 _old_state: EntryState, |
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204 _entry: DirstateEntry, |
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205 ) -> Result<(), DirstateMapError> { |
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206 todo!() |
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207 } |
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208 |
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209 fn remove_file( |
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210 &mut self, |
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211 _filename: &HgPath, |
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212 _old_state: EntryState, |
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213 _size: i32, |
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214 ) -> Result<(), DirstateMapError> { |
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215 todo!() |
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216 } |
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217 |
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218 fn drop_file( |
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219 &mut self, |
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220 _filename: &HgPath, |
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221 _old_state: EntryState, |
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222 ) -> Result<bool, DirstateMapError> { |
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223 todo!() |
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224 } |
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225 |
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226 fn clear_ambiguous_times( |
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227 &mut self, |
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228 _filenames: Vec<HgPathBuf>, |
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229 _now: i32, |
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230 ) { |
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231 todo!() |
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232 } |
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233 |
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234 fn non_normal_entries_contains(&mut self, _key: &HgPath) -> bool { |
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235 todo!() |
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236 } |
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237 |
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238 fn non_normal_entries_remove(&mut self, _key: &HgPath) -> bool { |
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239 todo!() |
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240 } |
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241 |
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242 fn non_normal_or_other_parent_paths( |
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243 &mut self, |
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244 ) -> Box<dyn Iterator<Item = &HgPathBuf> + '_> { |
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245 todo!() |
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246 } |
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247 |
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248 fn set_non_normal_other_parent_entries(&mut self, _force: bool) { |
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249 todo!() |
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250 } |
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251 |
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252 fn iter_non_normal_paths( |
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253 &mut self, |
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254 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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255 todo!() |
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256 } |
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257 |
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258 fn iter_non_normal_paths_panic( |
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259 &self, |
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260 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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261 todo!() |
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262 } |
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263 |
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264 fn iter_other_parent_paths( |
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265 &mut self, |
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266 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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267 todo!() |
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268 } |
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269 |
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270 fn has_tracked_dir( |
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271 &mut self, |
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272 _directory: &HgPath, |
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273 ) -> Result<bool, DirstateMapError> { |
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274 todo!() |
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275 } |
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276 |
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277 fn has_dir( |
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278 &mut self, |
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279 _directory: &HgPath, |
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280 ) -> Result<bool, DirstateMapError> { |
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281 todo!() |
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282 } |
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283 |
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284 fn parents( |
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285 &mut self, |
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286 file_contents: &[u8], |
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287 ) -> Result<&DirstateParents, DirstateError> { |
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288 if self.parents.is_none() { |
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289 let parents = if !file_contents.is_empty() { |
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290 parse_dirstate_parents(file_contents)?.clone() |
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291 } else { |
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292 DirstateParents { |
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293 p1: NULL_NODE, |
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294 p2: NULL_NODE, |
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295 } |
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296 }; |
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297 self.parents = Some(parents); |
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298 } |
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299 Ok(self.parents.as_ref().unwrap()) |
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300 } |
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301 |
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302 fn set_parents(&mut self, parents: &DirstateParents) { |
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303 self.parents = Some(parents.clone()); |
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304 self.dirty_parents = true; |
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305 } |
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306 |
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307 fn read<'a>( |
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308 &mut self, |
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309 file_contents: &'a [u8], |
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310 ) -> Result<Option<&'a DirstateParents>, DirstateError> { |
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311 if file_contents.is_empty() { |
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312 return Ok(None); |
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313 } |
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314 |
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315 let parents = parse_dirstate_entries( |
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316 file_contents, |
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317 |path, entry, copy_source| { |
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318 let node = self.get_or_insert_node(path); |
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319 node.entry = Some(*entry); |
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320 node.copy_source = copy_source.map(HgPath::to_owned); |
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321 }, |
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322 )?; |
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323 |
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324 if !self.dirty_parents { |
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325 self.set_parents(parents); |
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326 } |
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327 |
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328 Ok(Some(parents)) |
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329 } |
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330 |
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331 fn pack( |
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332 &mut self, |
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333 parents: DirstateParents, |
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334 now: Timestamp, |
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335 ) -> Result<Vec<u8>, DirstateError> { |
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336 // Optizimation (to be measured?): pre-compute size to avoid `Vec` |
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337 // reallocations |
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338 let mut size = parents.as_bytes().len(); |
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339 for (path, node) in self.iter_nodes() { |
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340 if node.entry.is_some() { |
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341 size += packed_entry_size( |
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342 path.full_path(), |
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343 node.copy_source.as_ref(), |
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344 ) |
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345 } |
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346 } |
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347 |
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348 let mut packed = Vec::with_capacity(size); |
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349 packed.extend(parents.as_bytes()); |
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350 |
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351 let now: i32 = now.0.try_into().expect("time overflow"); |
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352 for (path, opt_entry, copy_source) in self.iter_node_data_mut() { |
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353 if let Some(entry) = opt_entry { |
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354 clear_ambiguous_mtime(entry, now); |
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355 pack_entry( |
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356 path.full_path(), |
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357 entry, |
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358 copy_source.as_ref(), |
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359 &mut packed, |
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360 ); |
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361 } |
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362 } |
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363 self.dirty_parents = false; |
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364 Ok(packed) |
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365 } |
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366 |
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367 fn build_file_fold_map(&mut self) -> &FastHashMap<HgPathBuf, HgPathBuf> { |
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368 todo!() |
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369 } |
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370 |
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371 fn set_all_dirs(&mut self) -> Result<(), DirstateMapError> { |
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372 todo!() |
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373 } |
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374 |
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375 fn set_dirs(&mut self) -> Result<(), DirstateMapError> { |
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376 todo!() |
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377 } |
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378 |
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379 fn status<'a>( |
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380 &'a self, |
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381 _matcher: &'a (dyn Matcher + Sync), |
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382 _root_dir: PathBuf, |
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383 _ignore_files: Vec<PathBuf>, |
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384 _options: StatusOptions, |
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385 ) -> Result< |
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386 ( |
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387 (Vec<HgPathCow<'a>>, DirstateStatus<'a>), |
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388 Vec<PatternFileWarning>, |
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389 ), |
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390 StatusError, |
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391 > { |
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392 todo!() |
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393 } |
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394 |
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395 fn copy_map_len(&self) -> usize { |
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396 todo!() |
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397 } |
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398 |
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399 fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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400 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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401 node.copy_source |
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402 .as_ref() |
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403 .map(|copy_source| (path.full_path(), copy_source)) |
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404 })) |
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405 } |
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406 |
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407 fn copy_map_contains_key(&self, key: &HgPath) -> bool { |
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408 if let Some(node) = self.get_node(key) { |
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409 node.copy_source.is_some() |
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410 } else { |
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411 false |
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412 } |
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413 } |
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414 |
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415 fn copy_map_get(&self, key: &HgPath) -> Option<&HgPathBuf> { |
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416 self.get_node(key)?.copy_source.as_ref() |
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417 } |
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418 |
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419 fn copy_map_remove(&mut self, _key: &HgPath) -> Option<HgPathBuf> { |
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420 todo!() |
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421 } |
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422 |
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423 fn copy_map_insert( |
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424 &mut self, |
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425 _key: HgPathBuf, |
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426 _value: HgPathBuf, |
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427 ) -> Option<HgPathBuf> { |
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428 todo!() |
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429 } |
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430 |
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431 fn len(&self) -> usize { |
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432 todo!() |
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433 } |
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434 |
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435 fn contains_key(&self, key: &HgPath) -> bool { |
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436 self.get(key).is_some() |
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437 } |
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438 |
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dirstate-tree: Add map `get` and `contains_key` methods
Simon Sapin <simon.sapin@octobus.net>
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439 fn get(&self, key: &HgPath) -> Option<&DirstateEntry> { |
3da19db33cbc
dirstate-tree: Add map `get` and `contains_key` methods
Simon Sapin <simon.sapin@octobus.net>
parents:
47098
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440 self.get_node(key)?.entry.as_ref() |
47095
473abf4728bf
dirstate-tree: Empty shell for a second Rust DirstateMap implementation
Simon Sapin <simon.sapin@octobus.net>
parents:
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441 } |
473abf4728bf
dirstate-tree: Empty shell for a second Rust DirstateMap implementation
Simon Sapin <simon.sapin@octobus.net>
parents:
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changeset
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442 |
473abf4728bf
dirstate-tree: Empty shell for a second Rust DirstateMap implementation
Simon Sapin <simon.sapin@octobus.net>
parents:
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443 fn iter(&self) -> StateMapIter<'_> { |
47100
caa3031c9ed5
dirstate-tree: Add tree traversal/iteration
Simon Sapin <simon.sapin@octobus.net>
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47099
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444 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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dirstate-tree: Add tree traversal/iteration
Simon Sapin <simon.sapin@octobus.net>
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445 node.entry.as_ref().map(|entry| (path.full_path(), entry)) |
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dirstate-tree: Add tree traversal/iteration
Simon Sapin <simon.sapin@octobus.net>
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446 })) |
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dirstate-tree: Empty shell for a second Rust DirstateMap implementation
Simon Sapin <simon.sapin@octobus.net>
parents:
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447 } |
473abf4728bf
dirstate-tree: Empty shell for a second Rust DirstateMap implementation
Simon Sapin <simon.sapin@octobus.net>
parents:
diff
changeset
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448 } |