annotate rust/hg-core/src/dirstate/entry.rs @ 48087:79bc60ca5946

dirstate-item: introduce a `any_tracked` property This property is True is the file is tracked anywhere, either the working copy, or any of the parent. Differential Revision: https://phab.mercurial-scm.org/D11524
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Wed, 29 Sep 2021 14:51:31 +0200
parents 80783e553bd5
children 3c7db97ce541
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use crate::errors::HgError;
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2 use bitflags::bitflags;
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3 use std::convert::TryFrom;
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4
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5 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
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6 pub enum EntryState {
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7 Normal,
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8 Added,
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9 Removed,
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10 Merged,
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11 }
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12
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13 /// The C implementation uses all signed types. This will be an issue
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14 /// either when 4GB+ source files are commonplace or in 2038, whichever
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15 /// comes first.
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16 #[derive(Debug, PartialEq, Copy, Clone)]
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17 pub struct DirstateEntry {
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18 flags: Flags,
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19 mode: i32,
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20 size: i32,
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21 mtime: i32,
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22 }
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23
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24 bitflags! {
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25 pub struct Flags: u8 {
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26 const WDIR_TRACKED = 1 << 0;
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27 const P1_TRACKED = 1 << 1;
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28 const P2_TRACKED = 1 << 2;
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29 const POSSIBLY_DIRTY = 1 << 3;
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30 const MERGED = 1 << 4;
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31 const CLEAN_P1 = 1 << 5;
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32 const CLEAN_P2 = 1 << 6;
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33 const ENTRYLESS_TREE_NODE = 1 << 7;
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34 }
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35 }
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36
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37 pub const V1_RANGEMASK: i32 = 0x7FFFFFFF;
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38
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39 pub const MTIME_UNSET: i32 = -1;
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40
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41 /// A `DirstateEntry` with a size of `-2` means that it was merged from the
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42 /// other parent. This allows revert to pick the right status back during a
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43 /// merge.
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44 pub const SIZE_FROM_OTHER_PARENT: i32 = -2;
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45 /// A special value used for internal representation of special case in
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46 /// dirstate v1 format.
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47 pub const SIZE_NON_NORMAL: i32 = -1;
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48
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49 impl DirstateEntry {
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50 pub fn new(
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51 flags: Flags,
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52 mode_size_mtime: Option<(i32, i32, i32)>,
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53 ) -> Self {
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54 let (mode, size, mtime) =
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55 mode_size_mtime.unwrap_or((0, SIZE_NON_NORMAL, MTIME_UNSET));
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56 Self {
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57 flags,
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58 mode,
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59 size,
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60 mtime,
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61 }
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62 }
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63
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64 pub fn from_v1_data(
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65 state: EntryState,
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66 mode: i32,
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67 size: i32,
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68 mtime: i32,
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69 ) -> Self {
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70 match state {
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71 EntryState::Normal => {
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72 if size == SIZE_FROM_OTHER_PARENT {
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73 Self::new_from_p2()
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74 } else if size == SIZE_NON_NORMAL {
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75 Self::new_possibly_dirty()
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76 } else if mtime == MTIME_UNSET {
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77 Self {
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78 flags: Flags::WDIR_TRACKED
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79 | Flags::P1_TRACKED
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80 | Flags::POSSIBLY_DIRTY,
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81 mode,
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82 size,
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83 mtime: 0,
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84 }
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85 } else {
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86 Self::new_normal(mode, size, mtime)
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87 }
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88 }
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89 EntryState::Added => Self::new_added(),
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90 EntryState::Removed => Self {
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91 flags: if size == SIZE_NON_NORMAL {
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92 Flags::P1_TRACKED // might not be true because of rename ?
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93 | Flags::P2_TRACKED // might not be true because of rename ?
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94 | Flags::MERGED
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95 } else if size == SIZE_FROM_OTHER_PARENT {
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96 // We don’t know if P1_TRACKED should be set (file history)
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97 Flags::P2_TRACKED | Flags::CLEAN_P2
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98 } else {
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99 Flags::P1_TRACKED
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100 },
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101 mode: 0,
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102 size: 0,
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103 mtime: 0,
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104 },
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105 EntryState::Merged => Self::new_merged(),
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106 }
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107 }
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108
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109 pub fn new_from_p2() -> Self {
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110 Self {
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111 // might be missing P1_TRACKED
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112 flags: Flags::WDIR_TRACKED | Flags::P2_TRACKED | Flags::CLEAN_P2,
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113 mode: 0,
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114 size: SIZE_FROM_OTHER_PARENT,
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115 mtime: MTIME_UNSET,
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116 }
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117 }
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118
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119 pub fn new_possibly_dirty() -> Self {
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120 Self {
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121 flags: Flags::WDIR_TRACKED
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122 | Flags::P1_TRACKED
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123 | Flags::POSSIBLY_DIRTY,
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124 mode: 0,
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125 size: SIZE_NON_NORMAL,
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126 mtime: MTIME_UNSET,
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127 }
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128 }
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129
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130 pub fn new_added() -> Self {
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131 Self {
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132 flags: Flags::WDIR_TRACKED,
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133 mode: 0,
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134 size: SIZE_NON_NORMAL,
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135 mtime: MTIME_UNSET,
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136 }
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137 }
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138
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139 pub fn new_merged() -> Self {
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140 Self {
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141 flags: Flags::WDIR_TRACKED
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142 | Flags::P1_TRACKED // might not be true because of rename ?
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143 | Flags::P2_TRACKED // might not be true because of rename ?
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144 | Flags::MERGED,
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145 mode: 0,
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146 size: SIZE_NON_NORMAL,
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147 mtime: MTIME_UNSET,
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148 }
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149 }
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150
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151 pub fn new_normal(mode: i32, size: i32, mtime: i32) -> Self {
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152 Self {
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153 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED,
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154 mode,
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155 size,
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156 mtime,
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157 }
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158 }
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159
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160 /// Creates a new entry in "removed" state.
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161 ///
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162 /// `size` is expected to be zero, `SIZE_NON_NORMAL`, or
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163 /// `SIZE_FROM_OTHER_PARENT`
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164 pub fn new_removed(size: i32) -> Self {
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165 Self::from_v1_data(EntryState::Removed, 0, size, 0)
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166 }
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167
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168 pub fn tracked(&self) -> bool {
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169 self.flags.contains(Flags::WDIR_TRACKED)
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170 }
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171
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172 fn tracked_in_any_parent(&self) -> bool {
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173 self.flags.intersects(Flags::P1_TRACKED | Flags::P2_TRACKED)
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174 }
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175
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176 pub fn removed(&self) -> bool {
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177 self.tracked_in_any_parent()
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178 && !self.flags.contains(Flags::WDIR_TRACKED)
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179 }
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180
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181 pub fn merged(&self) -> bool {
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182 self.flags.contains(Flags::WDIR_TRACKED | Flags::MERGED)
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183 }
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184
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185 pub fn added(&self) -> bool {
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186 self.flags.contains(Flags::WDIR_TRACKED)
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187 && !self.tracked_in_any_parent()
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188 }
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189
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190 pub fn from_p2(&self) -> bool {
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191 self.flags.contains(Flags::WDIR_TRACKED | Flags::CLEAN_P2)
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192 }
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193
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194 pub fn maybe_clean(&self) -> bool {
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195 if !self.flags.contains(Flags::WDIR_TRACKED) {
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196 false
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197 } else if self.added() {
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198 false
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199 } else if self.flags.contains(Flags::MERGED) {
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200 false
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201 } else if self.flags.contains(Flags::CLEAN_P2) {
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202 false
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203 } else {
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204 true
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205 }
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206 }
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207
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208 pub fn any_tracked(&self) -> bool {
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209 self.flags.intersects(
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210 Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_TRACKED,
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211 )
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212 }
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213
48022
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214 pub fn state(&self) -> EntryState {
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215 if self.removed() {
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216 EntryState::Removed
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217 } else if self.merged() {
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218 EntryState::Merged
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219 } else if self.added() {
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220 EntryState::Added
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221 } else {
008959fcbfb2 rust: Align DirstateEntry internals with Python/C DirstateItem
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222 EntryState::Normal
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223 }
48022
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224 }
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225
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226 pub fn mode(&self) -> i32 {
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227 self.mode
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228 }
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229
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diff changeset
230 pub fn size(&self) -> i32 {
48064
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diff changeset
231 if self.removed() && self.flags.contains(Flags::MERGED) {
48042
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232 SIZE_NON_NORMAL
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diff changeset
233 } else if self.removed() && self.flags.contains(Flags::CLEAN_P2) {
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234 SIZE_FROM_OTHER_PARENT
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235 } else if self.removed() {
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236 0
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237 } else if self.merged() {
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238 SIZE_FROM_OTHER_PARENT
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diff changeset
239 } else if self.added() {
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240 SIZE_NON_NORMAL
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241 } else if self.from_p2() {
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242 SIZE_FROM_OTHER_PARENT
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243 } else if self.flags.contains(Flags::POSSIBLY_DIRTY) {
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244 self.size // TODO: SIZE_NON_NORMAL ?
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245 } else {
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246 self.size
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247 }
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248 }
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249
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250 pub fn mtime(&self) -> i32 {
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251 if self.removed() {
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252 0
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253 } else if self.flags.contains(Flags::POSSIBLY_DIRTY) {
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254 MTIME_UNSET
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255 } else if self.merged() {
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256 MTIME_UNSET
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257 } else if self.added() {
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258 MTIME_UNSET
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259 } else if self.from_p2() {
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260 MTIME_UNSET
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261 } else {
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262 self.mtime
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263 }
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264 }
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265
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266 pub fn set_possibly_dirty(&mut self) {
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267 self.flags.insert(Flags::POSSIBLY_DIRTY)
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268 }
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269
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270 pub fn set_clean(&mut self, mode: i32, size: i32, mtime: i32) {
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271 self.flags.insert(Flags::WDIR_TRACKED | Flags::P1_TRACKED);
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272 self.flags.remove(
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273 Flags::P2_TRACKED // This might be wrong
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274 | Flags::MERGED
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275 | Flags::CLEAN_P2
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276 | Flags::POSSIBLY_DIRTY,
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277 );
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278 self.mode = mode;
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279 self.size = size;
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280 self.mtime = mtime;
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281 }
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282
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283 pub fn set_tracked(&mut self) {
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284 self.flags
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285 .insert(Flags::WDIR_TRACKED | Flags::POSSIBLY_DIRTY);
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286 // size = None on the python size turn into size = NON_NORMAL when
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287 // accessed. So the next line is currently required, but a some future
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288 // clean up would be welcome.
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289 self.size = SIZE_NON_NORMAL;
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290 }
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291
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292 pub fn set_untracked(&mut self) {
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293 self.flags.remove(Flags::WDIR_TRACKED);
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294 self.mode = 0;
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295 self.size = 0;
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296 self.mtime = 0;
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297 }
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298
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299 /// Returns `(state, mode, size, mtime)` for the puprose of serialization
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300 /// in the dirstate-v1 format.
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301 ///
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302 /// This includes marker values such as `mtime == -1`. In the future we may
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303 /// want to not represent these cases that way in memory, but serialization
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304 /// will need to keep the same format.
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305 pub fn v1_data(&self) -> (u8, i32, i32, i32) {
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306 (self.state().into(), self.mode(), self.size(), self.mtime())
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307 }
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308
48061
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309 pub(crate) fn is_from_other_parent(&self) -> bool {
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310 self.state() == EntryState::Normal
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311 && self.size() == SIZE_FROM_OTHER_PARENT
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312 }
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313
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314 // TODO: other platforms
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315 #[cfg(unix)]
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316 pub fn mode_changed(
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317 &self,
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318 filesystem_metadata: &std::fs::Metadata,
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319 ) -> bool {
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320 use std::os::unix::fs::MetadataExt;
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321 const EXEC_BIT_MASK: u32 = 0o100;
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322 let dirstate_exec_bit = (self.mode() as u32) & EXEC_BIT_MASK;
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323 let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK;
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324 dirstate_exec_bit != fs_exec_bit
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325 }
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326
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327 /// Returns a `(state, mode, size, mtime)` tuple as for
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328 /// `DirstateMapMethods::debug_iter`.
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329 pub fn debug_tuple(&self) -> (u8, i32, i32, i32) {
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330 let state = if self.flags.contains(Flags::ENTRYLESS_TREE_NODE) {
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331 b' '
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332 } else {
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333 self.state().into()
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334 };
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335 (state, self.mode(), self.size(), self.mtime())
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336 }
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337
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338 pub fn mtime_is_ambiguous(&self, now: i32) -> bool {
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339 self.state() == EntryState::Normal && self.mtime() == now
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340 }
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341
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342 pub fn clear_ambiguous_mtime(&mut self, now: i32) -> bool {
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343 let ambiguous = self.mtime_is_ambiguous(now);
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344 if ambiguous {
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345 // The file was last modified "simultaneously" with the current
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346 // write to dirstate (i.e. within the same second for file-
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347 // systems with a granularity of 1 sec). This commonly happens
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348 // for at least a couple of files on 'update'.
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349 // The user could change the file without changing its size
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350 // within the same second. Invalidate the file's mtime in
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351 // dirstate, forcing future 'status' calls to compare the
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352 // contents of the file if the size is the same. This prevents
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353 // mistakenly treating such files as clean.
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354 self.clear_mtime()
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355 }
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356 ambiguous
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357 }
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358
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359 pub fn clear_mtime(&mut self) {
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360 self.mtime = -1;
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361 }
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362 }
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363
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364 impl EntryState {
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365 pub fn is_tracked(self) -> bool {
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366 use EntryState::*;
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367 match self {
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368 Normal | Added | Merged => true,
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369 Removed => false,
48018
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370 }
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371 }
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372 }
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373
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374 impl TryFrom<u8> for EntryState {
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375 type Error = HgError;
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376
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377 fn try_from(value: u8) -> Result<Self, Self::Error> {
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378 match value {
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379 b'n' => Ok(EntryState::Normal),
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380 b'a' => Ok(EntryState::Added),
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381 b'r' => Ok(EntryState::Removed),
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382 b'm' => Ok(EntryState::Merged),
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383 _ => Err(HgError::CorruptedRepository(format!(
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384 "Incorrect dirstate entry state {}",
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385 value
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386 ))),
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387 }
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388 }
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389 }
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390
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391 impl Into<u8> for EntryState {
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392 fn into(self) -> u8 {
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393 match self {
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394 EntryState::Normal => b'n',
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395 EntryState::Added => b'a',
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396 EntryState::Removed => b'r',
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397 EntryState::Merged => b'm',
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398 }
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399 }
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400 }