Mercurial > hg
annotate rust/hg-core/src/dirstate/entry.rs @ 48026:1b2ee68e85f9
rust: Remove EntryState::Unknown
This enum variant represented the `state == '?'` case, which was used
to represent the absence of a dirstate entry/item (and therefore of that
entry’s state).
Now that previous refactors have removed this use in the Python/Rust
FFI APIs, the remaining uses can be removed by replacing `EntryState`
by `Option<EntryState>` where appropriate, using `None` to represent
the absence of an entry.
Differential Revision: https://phab.mercurial-scm.org/D11465
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 20 Sep 2021 20:55:38 +0200 |
parents | f2a9db29cb2d |
children | 008959fcbfb2 |
rev | line source |
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1 use crate::errors::HgError; |
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2 use std::convert::TryFrom; |
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3 |
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4 #[derive(Copy, Clone, Debug, Eq, PartialEq)] |
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5 pub enum EntryState { |
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6 Normal, |
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7 Added, |
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8 Removed, |
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9 Merged, |
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10 } |
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11 |
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12 /// The C implementation uses all signed types. This will be an issue |
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13 /// either when 4GB+ source files are commonplace or in 2038, whichever |
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14 /// comes first. |
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15 #[derive(Debug, PartialEq, Copy, Clone)] |
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16 pub struct DirstateEntry { |
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17 state: EntryState, |
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18 mode: i32, |
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19 size: i32, |
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20 mtime: i32, |
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21 } |
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22 |
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23 pub const V1_RANGEMASK: i32 = 0x7FFFFFFF; |
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24 |
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25 pub const MTIME_UNSET: i32 = -1; |
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26 |
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27 /// A `DirstateEntry` with a size of `-2` means that it was merged from the |
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28 /// other parent. This allows revert to pick the right status back during a |
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29 /// merge. |
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30 pub const SIZE_FROM_OTHER_PARENT: i32 = -2; |
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31 /// A special value used for internal representation of special case in |
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32 /// dirstate v1 format. |
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33 pub const SIZE_NON_NORMAL: i32 = -1; |
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34 |
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35 impl DirstateEntry { |
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36 pub fn from_v1_data( |
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37 state: EntryState, |
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38 mode: i32, |
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39 size: i32, |
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40 mtime: i32, |
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41 ) -> Self { |
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42 Self { |
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43 state, |
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44 mode, |
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45 size, |
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46 mtime, |
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47 } |
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48 } |
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49 |
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50 /// Creates a new entry in "removed" state. |
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51 /// |
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52 /// `size` is expected to be zero, `SIZE_NON_NORMAL`, or |
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53 /// `SIZE_FROM_OTHER_PARENT` |
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54 pub fn new_removed(size: i32) -> Self { |
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55 Self { |
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56 state: EntryState::Removed, |
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57 mode: 0, |
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58 size, |
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59 mtime: 0, |
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60 } |
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61 } |
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62 |
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63 /// TODO: refactor `DirstateMap::add_file` to not take a `DirstateEntry` |
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64 /// parameter and remove this constructor |
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65 pub fn new_for_add_file(mode: i32, size: i32, mtime: i32) -> Self { |
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66 Self { |
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67 // XXX Arbitrary default value since the value is determined later |
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68 state: EntryState::Normal, |
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69 mode, |
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70 size, |
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71 mtime, |
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72 } |
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73 } |
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74 |
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75 pub fn state(&self) -> EntryState { |
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76 self.state |
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77 } |
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78 |
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79 pub fn mode(&self) -> i32 { |
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80 self.mode |
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81 } |
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82 |
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83 pub fn size(&self) -> i32 { |
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84 self.size |
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85 } |
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86 |
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87 pub fn mtime(&self) -> i32 { |
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88 self.mtime |
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89 } |
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90 |
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91 /// Returns `(state, mode, size, mtime)` for the puprose of serialization |
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92 /// in the dirstate-v1 format. |
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93 /// |
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94 /// This includes marker values such as `mtime == -1`. In the future we may |
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95 /// want to not represent these cases that way in memory, but serialization |
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96 /// will need to keep the same format. |
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97 pub fn v1_data(&self) -> (u8, i32, i32, i32) { |
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98 (self.state.into(), self.mode, self.size, self.mtime) |
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99 } |
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100 |
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101 pub fn is_non_normal(&self) -> bool { |
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102 self.state != EntryState::Normal || self.mtime == MTIME_UNSET |
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103 } |
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104 |
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105 pub fn is_from_other_parent(&self) -> bool { |
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106 self.state == EntryState::Normal && self.size == SIZE_FROM_OTHER_PARENT |
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107 } |
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108 |
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109 // TODO: other platforms |
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110 #[cfg(unix)] |
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111 pub fn mode_changed( |
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112 &self, |
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113 filesystem_metadata: &std::fs::Metadata, |
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114 ) -> bool { |
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115 use std::os::unix::fs::MetadataExt; |
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116 const EXEC_BIT_MASK: u32 = 0o100; |
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117 let dirstate_exec_bit = (self.mode as u32) & EXEC_BIT_MASK; |
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118 let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK; |
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119 dirstate_exec_bit != fs_exec_bit |
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120 } |
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121 |
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122 /// Returns a `(state, mode, size, mtime)` tuple as for |
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123 /// `DirstateMapMethods::debug_iter`. |
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124 pub fn debug_tuple(&self) -> (u8, i32, i32, i32) { |
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125 (self.state.into(), self.mode, self.size, self.mtime) |
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126 } |
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127 |
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128 pub fn mtime_is_ambiguous(&self, now: i32) -> bool { |
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129 self.state == EntryState::Normal && self.mtime == now |
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130 } |
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131 |
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132 pub fn clear_ambiguous_mtime(&mut self, now: i32) -> bool { |
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133 let ambiguous = self.mtime_is_ambiguous(now); |
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134 if ambiguous { |
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135 // The file was last modified "simultaneously" with the current |
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136 // write to dirstate (i.e. within the same second for file- |
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137 // systems with a granularity of 1 sec). This commonly happens |
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138 // for at least a couple of files on 'update'. |
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139 // The user could change the file without changing its size |
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140 // within the same second. Invalidate the file's mtime in |
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141 // dirstate, forcing future 'status' calls to compare the |
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142 // contents of the file if the size is the same. This prevents |
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143 // mistakenly treating such files as clean. |
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144 self.clear_mtime() |
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145 } |
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146 ambiguous |
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147 } |
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148 |
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149 pub fn clear_mtime(&mut self) { |
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150 self.mtime = -1; |
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151 } |
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152 } |
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153 |
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154 impl EntryState { |
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155 pub fn is_tracked(self) -> bool { |
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156 use EntryState::*; |
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157 match self { |
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158 Normal | Added | Merged => true, |
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159 Removed => false, |
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160 } |
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161 } |
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162 } |
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163 |
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164 impl TryFrom<u8> for EntryState { |
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165 type Error = HgError; |
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166 |
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167 fn try_from(value: u8) -> Result<Self, Self::Error> { |
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168 match value { |
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169 b'n' => Ok(EntryState::Normal), |
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170 b'a' => Ok(EntryState::Added), |
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171 b'r' => Ok(EntryState::Removed), |
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172 b'm' => Ok(EntryState::Merged), |
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173 _ => Err(HgError::CorruptedRepository(format!( |
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174 "Incorrect dirstate entry state {}", |
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175 value |
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176 ))), |
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177 } |
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178 } |
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179 } |
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180 |
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181 impl Into<u8> for EntryState { |
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182 fn into(self) -> u8 { |
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183 match self { |
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184 EntryState::Normal => b'n', |
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185 EntryState::Added => b'a', |
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186 EntryState::Removed => b'r', |
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187 EntryState::Merged => b'm', |
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188 } |
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189 } |
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190 } |