Mercurial > hg
annotate rust/hg-core/src/config/config.rs @ 46481:0d734c0ae1cf
rust: replace read_whole_file with std::fs::read
It does the same thing
Differential Revision: https://phab.mercurial-scm.org/D9959
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 01 Feb 2021 12:25:53 +0100 |
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1 // config.rs |
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2 // |
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3 // Copyright 2020 |
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4 // Valentin Gatien-Baron, |
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5 // Raphaël Gomès <rgomes@octobus.net> |
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6 // |
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7 // This software may be used and distributed according to the terms of the |
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8 // GNU General Public License version 2 or any later version. |
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9 |
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10 use super::layer; |
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11 use crate::config::layer::{ |
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12 ConfigError, ConfigLayer, ConfigParseError, ConfigValue, |
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13 }; |
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14 use std::path::PathBuf; |
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15 |
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16 use crate::repo::Repo; |
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17 |
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18 /// Holds the config values for the current repository |
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19 /// TODO update this docstring once we support more sources |
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20 pub struct Config { |
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21 layers: Vec<layer::ConfigLayer>, |
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22 } |
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23 |
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24 impl std::fmt::Debug for Config { |
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25 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { |
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26 for (index, layer) in self.layers.iter().rev().enumerate() { |
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27 write!( |
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28 f, |
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29 "==== Layer {} (trusted: {}) ====\n{:?}", |
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30 index, layer.trusted, layer |
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31 )?; |
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32 } |
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33 Ok(()) |
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34 } |
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35 } |
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36 |
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37 pub enum ConfigSource { |
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38 /// Absolute path to a config file |
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39 AbsPath(PathBuf), |
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40 /// Already parsed (from the CLI, env, Python resources, etc.) |
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41 Parsed(layer::ConfigLayer), |
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42 } |
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43 |
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44 pub fn parse_bool(v: &[u8]) -> Option<bool> { |
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45 match v.to_ascii_lowercase().as_slice() { |
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46 b"1" | b"yes" | b"true" | b"on" | b"always" => Some(true), |
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47 b"0" | b"no" | b"false" | b"off" | b"never" => Some(false), |
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48 _ => None, |
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49 } |
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50 } |
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51 |
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52 impl Config { |
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53 /// Loads in order, which means that the precedence is the same |
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54 /// as the order of `sources`. |
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55 pub fn load_from_explicit_sources( |
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56 sources: Vec<ConfigSource>, |
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57 ) -> Result<Self, ConfigError> { |
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58 let mut layers = vec![]; |
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59 |
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60 for source in sources.into_iter() { |
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61 match source { |
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62 ConfigSource::Parsed(c) => layers.push(c), |
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63 ConfigSource::AbsPath(c) => { |
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64 // TODO check if it should be trusted |
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65 // mercurial/ui.py:427 |
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66 let data = match std::fs::read(&c) { |
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67 Err(_) => continue, // same as the python code |
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68 Ok(data) => data, |
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69 }; |
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70 layers.extend(ConfigLayer::parse(&c, &data)?) |
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71 } |
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72 } |
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73 } |
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74 |
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75 Ok(Config { layers }) |
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76 } |
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77 |
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78 /// Loads the local config. In a future version, this will also load the |
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79 /// `$HOME/.hgrc` and more to mirror the Python implementation. |
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80 pub fn load_for_repo(repo: &Repo) -> Result<Self, ConfigError> { |
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81 Ok(Self::load_from_explicit_sources(vec![ |
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82 ConfigSource::AbsPath(repo.hg_vfs().join("hgrc")), |
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83 ])?) |
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84 } |
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85 |
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86 /// Returns an `Err` if the first value found is not a valid boolean. |
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87 /// Otherwise, returns an `Ok(option)`, where `option` is the boolean if |
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88 /// found, or `None`. |
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89 pub fn get_option( |
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90 &self, |
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91 section: &[u8], |
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92 item: &[u8], |
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93 ) -> Result<Option<bool>, ConfigParseError> { |
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94 match self.get_inner(§ion, &item) { |
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95 Some((layer, v)) => match parse_bool(&v.bytes) { |
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96 Some(b) => Ok(Some(b)), |
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97 None => Err(ConfigParseError { |
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98 origin: layer.origin.to_owned(), |
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99 line: v.line, |
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100 bytes: v.bytes.to_owned(), |
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101 }), |
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102 }, |
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103 None => Ok(None), |
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104 } |
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105 } |
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106 |
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107 /// Returns the corresponding boolean in the config. Returns `Ok(false)` |
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108 /// if the value is not found, an `Err` if it's not a valid boolean. |
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109 pub fn get_bool( |
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110 &self, |
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111 section: &[u8], |
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112 item: &[u8], |
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113 ) -> Result<bool, ConfigError> { |
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114 Ok(self.get_option(section, item)?.unwrap_or(false)) |
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115 } |
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116 |
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117 /// Returns the raw value bytes of the first one found, or `None`. |
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118 pub fn get(&self, section: &[u8], item: &[u8]) -> Option<&[u8]> { |
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119 self.get_inner(section, item) |
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120 .map(|(_, value)| value.bytes.as_ref()) |
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121 } |
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122 |
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123 /// Returns the layer and the value of the first one found, or `None`. |
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124 fn get_inner( |
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125 &self, |
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126 section: &[u8], |
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127 item: &[u8], |
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128 ) -> Option<(&ConfigLayer, &ConfigValue)> { |
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129 for layer in self.layers.iter().rev() { |
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130 if !layer.trusted { |
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131 continue; |
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132 } |
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133 if let Some(v) = layer.get(§ion, &item) { |
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134 return Some((&layer, v)); |
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135 } |
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136 } |
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137 None |
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138 } |
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139 |
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140 /// Get raw values bytes from all layers (even untrusted ones) in order |
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141 /// of precedence. |
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142 #[cfg(test)] |
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143 fn get_all(&self, section: &[u8], item: &[u8]) -> Vec<&[u8]> { |
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144 let mut res = vec![]; |
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145 for layer in self.layers.iter().rev() { |
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146 if let Some(v) = layer.get(§ion, &item) { |
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147 res.push(v.bytes.as_ref()); |
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148 } |
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149 } |
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150 res |
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151 } |
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152 } |
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153 |
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154 #[cfg(test)] |
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155 mod tests { |
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156 use super::*; |
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157 use pretty_assertions::assert_eq; |
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158 use std::fs::File; |
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159 use std::io::Write; |
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160 |
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161 #[test] |
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162 fn test_include_layer_ordering() { |
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163 let tmpdir = tempfile::tempdir().unwrap(); |
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164 let tmpdir_path = tmpdir.path(); |
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165 let mut included_file = |
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166 File::create(&tmpdir_path.join("included.rc")).unwrap(); |
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167 |
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168 included_file.write_all(b"[section]\nitem=value1").unwrap(); |
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169 let base_config_path = tmpdir_path.join("base.rc"); |
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170 let mut config_file = File::create(&base_config_path).unwrap(); |
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171 let data = |
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172 b"[section]\nitem=value0\n%include included.rc\nitem=value2"; |
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173 config_file.write_all(data).unwrap(); |
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174 |
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175 let sources = vec![ConfigSource::AbsPath(base_config_path)]; |
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176 let config = Config::load_from_explicit_sources(sources) |
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177 .expect("expected valid config"); |
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178 |
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179 dbg!(&config); |
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180 |
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181 let (_, value) = config.get_inner(b"section", b"item").unwrap(); |
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182 assert_eq!( |
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183 value, |
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184 &ConfigValue { |
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185 bytes: b"value2".to_vec(), |
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186 line: Some(4) |
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187 } |
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188 ); |
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189 |
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190 let value = config.get(b"section", b"item").unwrap(); |
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191 assert_eq!(value, b"value2",); |
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192 assert_eq!( |
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193 config.get_all(b"section", b"item"), |
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194 [b"value2", b"value1", b"value0"] |
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195 ); |
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196 } |
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197 } |