author | Simon Sapin <simon.sapin@octobus.net> |
Mon, 12 Apr 2021 14:21:47 +0200 | |
changeset 47116 | d6c94ca40863 |
parent 47115 | 5d62243c7732 |
child 47117 | 214ae40e136b |
permissions | -rw-r--r-- |
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1 |
use bytes_cast::BytesCast; |
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use std::path::PathBuf; |
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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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use crate::dirstate::parsers::clear_ambiguous_mtime; |
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use crate::dirstate::parsers::pack_entry; |
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use crate::dirstate::parsers::packed_entry_size; |
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use crate::dirstate::parsers::parse_dirstate_entries; |
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use crate::dirstate::parsers::parse_dirstate_parents; |
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use crate::dirstate::parsers::Timestamp; |
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use crate::matchers::Matcher; |
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use crate::revlog::node::NULL_NODE; |
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use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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use crate::CopyMapIter; |
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use crate::DirstateEntry; |
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use crate::DirstateError; |
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use crate::DirstateMapError; |
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use crate::DirstateParents; |
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use crate::DirstateStatus; |
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use crate::EntryState; |
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use crate::FastHashMap; |
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use crate::HgPathCow; |
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use crate::PatternFileWarning; |
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use crate::StateMapIter; |
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use crate::StatusError; |
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use crate::StatusOptions; |
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pub struct DirstateMap { |
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parents: Option<DirstateParents>, |
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dirty_parents: bool, |
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root: ChildNodes, |
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} |
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/// Using a plain `HgPathBuf` of the full path from the repository root as a |
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/// map key would also work: all paths in a given map have the same parent |
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/// path, so comparing full paths gives the same result as comparing base |
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/// names. However `BTreeMap` would waste time always re-comparing the same |
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/// string prefix. |
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type ChildNodes = BTreeMap<WithBasename<HgPathBuf>, Node>; |
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41 |
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#[derive(Default)] |
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struct Node { |
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entry: Option<DirstateEntry>, |
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copy_source: Option<HgPathBuf>, |
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children: ChildNodes, |
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} |
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/// `(full_path, entry, copy_source)` |
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type NodeDataMut<'a> = ( |
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&'a WithBasename<HgPathBuf>, |
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&'a mut Option<DirstateEntry>, |
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&'a mut Option<HgPathBuf>, |
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54 |
); |
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55 |
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impl DirstateMap { |
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57 |
pub fn new() -> Self { |
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Self { |
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parents: None, |
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dirty_parents: false, |
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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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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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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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ancestor_path = next; |
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child_nodes = &mut child_node.children; |
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103 |
} else { |
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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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&'a self, |
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) -> 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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// children: &ChildNodes, |
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// each: &mut impl FnMut(&Node), |
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122 |
// ) { |
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123 |
// for child in children.values() { |
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// traverse_children(&child.children, each); |
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// 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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// 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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} |
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fn remove_file( |
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&mut self, |
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_filename: &HgPath, |
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_old_state: EntryState, |
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_size: i32, |
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) -> Result<(), DirstateMapError> { |
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todo!() |
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} |
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fn drop_file( |
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&mut self, |
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_filename: &HgPath, |
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_old_state: EntryState, |
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) -> Result<bool, DirstateMapError> { |
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todo!() |
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} |
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fn clear_ambiguous_times( |
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&mut self, |
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_filenames: Vec<HgPathBuf>, |
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_now: i32, |
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) { |
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todo!() |
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} |
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fn non_normal_entries_contains(&mut self, _key: &HgPath) -> bool { |
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todo!() |
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} |
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fn non_normal_entries_remove(&mut self, _key: &HgPath) -> bool { |
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todo!() |
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} |
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241 |
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fn non_normal_or_other_parent_paths( |
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&mut self, |
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) -> Box<dyn Iterator<Item = &HgPathBuf> + '_> { |
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todo!() |
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} |
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247 |
|
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fn set_non_normal_other_parent_entries(&mut self, _force: bool) { |
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todo!() |
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} |
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251 |
|
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252 |
fn iter_non_normal_paths( |
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&mut self, |
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) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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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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&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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p2: NULL_NODE, |
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} |
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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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|
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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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changeset
|
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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changeset
|
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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changeset
|
360 |
); |
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changeset
|
361 |
} |
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changeset
|
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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changeset
|
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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changeset
|
371 |
fn set_all_dirs(&mut self) -> Result<(), DirstateMapError> { |
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|
372 |
todo!() |
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|
373 |
} |
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changeset
|
374 |
|
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|
375 |
fn set_dirs(&mut self) -> Result<(), DirstateMapError> { |
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|
376 |
todo!() |
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changeset
|
377 |
} |
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changeset
|
378 |
|
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changeset
|
379 |
fn status<'a>( |
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changeset
|
380 |
&'a self, |
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changeset
|
381 |
_matcher: &'a (dyn Matcher + Sync), |
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changeset
|
382 |
_root_dir: PathBuf, |
473abf4728bf
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diff
changeset
|
383 |
_ignore_files: Vec<PathBuf>, |
473abf4728bf
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parents:
diff
changeset
|
384 |
_options: StatusOptions, |
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parents:
diff
changeset
|
385 |
) -> Result< |
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parents:
diff
changeset
|
386 |
( |
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parents:
diff
changeset
|
387 |
(Vec<HgPathCow<'a>>, DirstateStatus<'a>), |
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parents:
diff
changeset
|
388 |
Vec<PatternFileWarning>, |
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diff
changeset
|
389 |
), |
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parents:
diff
changeset
|
390 |
StatusError, |
473abf4728bf
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parents:
diff
changeset
|
391 |
> { |
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diff
changeset
|
392 |
todo!() |
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parents:
diff
changeset
|
393 |
} |
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parents:
diff
changeset
|
394 |
|
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parents:
diff
changeset
|
395 |
fn copy_map_len(&self) -> usize { |
473abf4728bf
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parents:
diff
changeset
|
396 |
todo!() |
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parents:
diff
changeset
|
397 |
} |
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parents:
diff
changeset
|
398 |
|
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parents:
diff
changeset
|
399 |
fn copy_map_iter(&self) -> CopyMapIter<'_> { |
47114
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dirstate-tree: Add tree traversal/iteration
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parents:
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changeset
|
400 |
Box::new(self.iter_nodes().filter_map(|(path, node)| { |
caa3031c9ed5
dirstate-tree: Add tree traversal/iteration
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parents:
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changeset
|
401 |
node.copy_source |
caa3031c9ed5
dirstate-tree: Add tree traversal/iteration
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parents:
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changeset
|
402 |
.as_ref() |
caa3031c9ed5
dirstate-tree: Add tree traversal/iteration
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parents:
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changeset
|
403 |
.map(|copy_source| (path.full_path(), copy_source)) |
caa3031c9ed5
dirstate-tree: Add tree traversal/iteration
Simon Sapin <simon.sapin@octobus.net>
parents:
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diff
changeset
|
404 |
})) |
47109
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parents:
diff
changeset
|
405 |
} |
473abf4728bf
dirstate-tree: Empty shell for a second Rust DirstateMap implementation
Simon Sapin <simon.sapin@octobus.net>
parents:
diff
changeset
|
406 |
|
47113
3da19db33cbc
dirstate-tree: Add map `get` and `contains_key` methods
Simon Sapin <simon.sapin@octobus.net>
parents:
47112
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changeset
|
407 |
fn copy_map_contains_key(&self, key: &HgPath) -> bool { |
3da19db33cbc
dirstate-tree: Add map `get` and `contains_key` methods
Simon Sapin <simon.sapin@octobus.net>
parents:
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changeset
|
408 |
if let Some(node) = self.get_node(key) { |
3da19db33cbc
dirstate-tree: Add map `get` and `contains_key` methods
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parents:
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changeset
|
409 |
node.copy_source.is_some() |
3da19db33cbc
dirstate-tree: Add map `get` and `contains_key` methods
Simon Sapin <simon.sapin@octobus.net>
parents:
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changeset
|
410 |
} else { |
3da19db33cbc
dirstate-tree: Add map `get` and `contains_key` methods
Simon Sapin <simon.sapin@octobus.net>
parents:
47112
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changeset
|
411 |
false |
3da19db33cbc
dirstate-tree: Add map `get` and `contains_key` methods
Simon Sapin <simon.sapin@octobus.net>
parents:
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diff
changeset
|
412 |
} |
47109
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dirstate-tree: Empty shell for a second Rust DirstateMap implementation
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parents:
diff
changeset
|
413 |
} |
473abf4728bf
dirstate-tree: Empty shell for a second Rust DirstateMap implementation
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parents:
diff
changeset
|
414 |
|
47113
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dirstate-tree: Add map `get` and `contains_key` methods
Simon Sapin <simon.sapin@octobus.net>
parents:
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changeset
|
415 |
fn copy_map_get(&self, key: &HgPath) -> Option<&HgPathBuf> { |
3da19db33cbc
dirstate-tree: Add map `get` and `contains_key` methods
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parents:
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changeset
|
416 |
self.get_node(key)?.copy_source.as_ref() |
47109
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parents:
diff
changeset
|
417 |
} |
473abf4728bf
dirstate-tree: Empty shell for a second Rust DirstateMap implementation
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parents:
diff
changeset
|
418 |
|
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parents:
diff
changeset
|
419 |
fn copy_map_remove(&mut self, _key: &HgPath) -> Option<HgPathBuf> { |
473abf4728bf
dirstate-tree: Empty shell for a second Rust DirstateMap implementation
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parents:
diff
changeset
|
420 |
todo!() |
473abf4728bf
dirstate-tree: Empty shell for a second Rust DirstateMap implementation
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parents:
diff
changeset
|
421 |
} |
473abf4728bf
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Simon Sapin <simon.sapin@octobus.net>
parents:
diff
changeset
|
422 |
|
473abf4728bf
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Simon Sapin <simon.sapin@octobus.net>
parents:
diff
changeset
|
423 |
fn copy_map_insert( |
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&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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439 |
fn get(&self, key: &HgPath) -> Option<&DirstateEntry> { |
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440 |
self.get_node(key)?.entry.as_ref() |
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441 |
} |
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442 |
|
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443 |
fn iter(&self) -> StateMapIter<'_> { |
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Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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445 |
node.entry.as_ref().map(|entry| (path.full_path(), entry)) |
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446 |
})) |
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447 |
} |
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448 |
} |