Mercurial > hg
annotate rust/hg-core/src/dirstate/entry.rs @ 48022:f2a9db29cb2d
rust: Make the fields of DirstateEntry private
This is a first step toward making its internal structure equivalent to
Python’s DirstateItem.
Differential Revision: https://phab.mercurial-scm.org/D11461
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Fri, 17 Sep 2021 13:33:45 +0200 |
parents | 08efe5945d2b |
children | 1b2ee68e85f9 |
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 Unknown, |
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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 state: EntryState, |
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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 pub const V1_RANGEMASK: i32 = 0x7FFFFFFF; |
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25 |
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26 pub const MTIME_UNSET: i32 = -1; |
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27 |
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28 /// A `DirstateEntry` with a size of `-2` means that it was merged from the |
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29 /// other parent. This allows revert to pick the right status back during a |
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30 /// merge. |
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31 pub const SIZE_FROM_OTHER_PARENT: i32 = -2; |
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32 /// A special value used for internal representation of special case in |
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33 /// dirstate v1 format. |
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34 pub const SIZE_NON_NORMAL: i32 = -1; |
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35 |
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36 impl DirstateEntry { |
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37 pub fn from_v1_data( |
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38 state: EntryState, |
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39 mode: i32, |
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40 size: i32, |
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41 mtime: i32, |
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42 ) -> Self { |
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43 Self { |
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44 state, |
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45 mode, |
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46 size, |
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47 mtime, |
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48 } |
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49 } |
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50 |
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51 /// Creates a new entry in "removed" state. |
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52 /// |
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53 /// `size` is expected to be zero, `SIZE_NON_NORMAL`, or |
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54 /// `SIZE_FROM_OTHER_PARENT` |
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55 pub fn new_removed(size: i32) -> Self { |
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56 Self { |
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57 state: EntryState::Removed, |
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58 mode: 0, |
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59 size, |
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60 mtime: 0, |
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61 } |
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62 } |
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63 |
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64 /// TODO: refactor `DirstateMap::add_file` to not take a `DirstateEntry` |
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65 /// parameter and remove this constructor |
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66 pub fn new_for_add_file(mode: i32, size: i32, mtime: i32) -> Self { |
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67 Self { |
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68 // XXX Arbitrary default value since the value is determined later |
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69 state: EntryState::Normal, |
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70 mode, |
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71 size, |
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72 mtime, |
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73 } |
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74 } |
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75 |
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76 pub fn state(&self) -> EntryState { |
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77 self.state |
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78 } |
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79 |
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80 pub fn mode(&self) -> i32 { |
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81 self.mode |
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82 } |
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83 |
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84 pub fn size(&self) -> i32 { |
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85 self.size |
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86 } |
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87 |
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88 pub fn mtime(&self) -> i32 { |
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89 self.mtime |
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90 } |
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91 |
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92 /// Returns `(state, mode, size, mtime)` for the puprose of serialization |
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93 /// in the dirstate-v1 format. |
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94 /// |
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95 /// This includes marker values such as `mtime == -1`. In the future we may |
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96 /// want to not represent these cases that way in memory, but serialization |
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97 /// will need to keep the same format. |
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98 pub fn v1_data(&self) -> (u8, i32, i32, i32) { |
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99 (self.state.into(), self.mode, self.size, self.mtime) |
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100 } |
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101 |
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102 pub fn is_non_normal(&self) -> bool { |
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103 self.state != EntryState::Normal || self.mtime == MTIME_UNSET |
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104 } |
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105 |
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106 pub fn is_from_other_parent(&self) -> bool { |
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107 self.state == EntryState::Normal && self.size == SIZE_FROM_OTHER_PARENT |
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108 } |
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109 |
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110 // TODO: other platforms |
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111 #[cfg(unix)] |
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112 pub fn mode_changed( |
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113 &self, |
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114 filesystem_metadata: &std::fs::Metadata, |
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115 ) -> bool { |
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116 use std::os::unix::fs::MetadataExt; |
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117 const EXEC_BIT_MASK: u32 = 0o100; |
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118 let dirstate_exec_bit = (self.mode as u32) & EXEC_BIT_MASK; |
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119 let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK; |
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120 dirstate_exec_bit != fs_exec_bit |
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121 } |
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122 |
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123 /// Returns a `(state, mode, size, mtime)` tuple as for |
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124 /// `DirstateMapMethods::debug_iter`. |
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125 pub fn debug_tuple(&self) -> (u8, i32, i32, i32) { |
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126 (self.state.into(), self.mode, self.size, self.mtime) |
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127 } |
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128 |
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129 pub fn mtime_is_ambiguous(&self, now: i32) -> bool { |
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130 self.state == EntryState::Normal && self.mtime == now |
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131 } |
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132 |
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133 pub fn clear_ambiguous_mtime(&mut self, now: i32) -> bool { |
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134 let ambiguous = self.mtime_is_ambiguous(now); |
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135 if ambiguous { |
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136 // The file was last modified "simultaneously" with the current |
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137 // write to dirstate (i.e. within the same second for file- |
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138 // systems with a granularity of 1 sec). This commonly happens |
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139 // for at least a couple of files on 'update'. |
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140 // The user could change the file without changing its size |
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141 // within the same second. Invalidate the file's mtime in |
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142 // dirstate, forcing future 'status' calls to compare the |
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143 // contents of the file if the size is the same. This prevents |
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144 // mistakenly treating such files as clean. |
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145 self.clear_mtime() |
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146 } |
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147 ambiguous |
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148 } |
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149 |
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150 pub fn clear_mtime(&mut self) { |
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151 self.mtime = -1; |
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152 } |
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153 } |
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154 |
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155 impl EntryState { |
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156 pub fn is_tracked(self) -> bool { |
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157 use EntryState::*; |
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158 match self { |
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159 Normal | Added | Merged => true, |
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160 Removed | Unknown => false, |
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161 } |
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162 } |
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163 } |
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164 |
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165 impl TryFrom<u8> for EntryState { |
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166 type Error = HgError; |
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167 |
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168 fn try_from(value: u8) -> Result<Self, Self::Error> { |
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169 match value { |
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170 b'n' => Ok(EntryState::Normal), |
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171 b'a' => Ok(EntryState::Added), |
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172 b'r' => Ok(EntryState::Removed), |
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173 b'm' => Ok(EntryState::Merged), |
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174 b'?' => Ok(EntryState::Unknown), |
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175 _ => Err(HgError::CorruptedRepository(format!( |
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176 "Incorrect dirstate entry state {}", |
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177 value |
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178 ))), |
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179 } |
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180 } |
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181 } |
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182 |
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183 impl Into<u8> for EntryState { |
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184 fn into(self) -> u8 { |
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185 match self { |
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186 EntryState::Normal => b'n', |
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187 EntryState::Added => b'a', |
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188 EntryState::Removed => b'r', |
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189 EntryState::Merged => b'm', |
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190 EntryState::Unknown => b'?', |
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191 } |
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192 } |
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193 } |