Mercurial > hg
annotate rust/hg-core/src/config/config.rs @ 48733:39c447e03dbc
rhg: Add support for colored output
The same "label" system is used as in Python code
Differential Revision: https://phab.mercurial-scm.org/D12167
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Thu, 10 Feb 2022 12:59:32 +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 super::values; |
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12 use crate::config::layer::{ |
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13 ConfigError, ConfigLayer, ConfigOrigin, ConfigValue, |
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14 }; |
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15 use crate::utils::files::get_bytes_from_os_str; |
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16 use format_bytes::{write_bytes, DisplayBytes}; |
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17 use std::collections::HashSet; |
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18 use std::env; |
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19 use std::fmt; |
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20 use std::path::{Path, PathBuf}; |
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21 use std::str; |
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22 |
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23 use crate::errors::{HgResultExt, IoResultExt}; |
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24 |
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25 /// Holds the config values for the current repository |
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26 /// TODO update this docstring once we support more sources |
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27 #[derive(Clone)] |
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28 pub struct Config { |
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29 layers: Vec<layer::ConfigLayer>, |
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30 } |
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31 |
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32 impl DisplayBytes for Config { |
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33 fn display_bytes( |
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34 &self, |
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35 out: &mut dyn std::io::Write, |
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36 ) -> std::io::Result<()> { |
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37 for (index, layer) in self.layers.iter().rev().enumerate() { |
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38 write_bytes!( |
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39 out, |
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40 b"==== Layer {} (trusted: {}) ====\n{}", |
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41 index, |
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42 if layer.trusted { |
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43 &b"yes"[..] |
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44 } else { |
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45 &b"no"[..] |
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46 }, |
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47 layer |
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48 )?; |
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49 } |
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50 Ok(()) |
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51 } |
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52 } |
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53 |
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54 pub enum ConfigSource { |
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55 /// Absolute path to a config file |
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56 AbsPath(PathBuf), |
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57 /// Already parsed (from the CLI, env, Python resources, etc.) |
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58 Parsed(layer::ConfigLayer), |
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59 } |
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60 |
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61 #[derive(Debug)] |
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62 pub struct ConfigValueParseError { |
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63 pub origin: ConfigOrigin, |
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64 pub line: Option<usize>, |
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65 pub section: Vec<u8>, |
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66 pub item: Vec<u8>, |
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67 pub value: Vec<u8>, |
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68 pub expected_type: &'static str, |
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69 } |
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70 |
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71 impl fmt::Display for ConfigValueParseError { |
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72 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
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73 // TODO: add origin and line number information, here and in |
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74 // corresponding python code |
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75 write!( |
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76 f, |
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77 "config error: {}.{} is not a {} ('{}')", |
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78 String::from_utf8_lossy(&self.section), |
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79 String::from_utf8_lossy(&self.item), |
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80 self.expected_type, |
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81 String::from_utf8_lossy(&self.value) |
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82 ) |
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83 } |
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84 } |
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85 |
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86 impl Config { |
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87 /// The configuration to use when printing configuration-loading errors |
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88 pub fn empty() -> Self { |
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89 Self { layers: Vec::new() } |
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90 } |
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91 |
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92 /// Load system and user configuration from various files. |
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93 /// |
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94 /// This is also affected by some environment variables. |
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95 pub fn load_non_repo() -> Result<Self, ConfigError> { |
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96 let mut config = Self { layers: Vec::new() }; |
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97 let opt_rc_path = env::var_os("HGRCPATH"); |
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98 // HGRCPATH replaces system config |
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99 if opt_rc_path.is_none() { |
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100 config.add_system_config()? |
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101 } |
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102 |
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103 config.add_for_environment_variable("EDITOR", b"ui", b"editor"); |
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104 config.add_for_environment_variable("VISUAL", b"ui", b"editor"); |
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105 config.add_for_environment_variable("PAGER", b"pager", b"pager"); |
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106 |
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107 // These are set by `run-tests.py --rhg` to enable fallback for the |
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108 // entire test suite. Alternatives would be setting configuration |
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109 // through `$HGRCPATH` but some tests override that, or changing the |
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110 // `hg` shell alias to include `--config` but that disrupts tests that |
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111 // print command lines and check expected output. |
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112 config.add_for_environment_variable( |
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113 "RHG_ON_UNSUPPORTED", |
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114 b"rhg", |
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115 b"on-unsupported", |
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116 ); |
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117 config.add_for_environment_variable( |
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118 "RHG_FALLBACK_EXECUTABLE", |
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119 b"rhg", |
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120 b"fallback-executable", |
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121 ); |
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122 config.add_for_environment_variable("RHG_STATUS", b"rhg", b"status"); |
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123 |
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124 // HGRCPATH replaces user config |
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125 if opt_rc_path.is_none() { |
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126 config.add_user_config()? |
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127 } |
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128 if let Some(rc_path) = &opt_rc_path { |
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129 for path in env::split_paths(rc_path) { |
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130 if !path.as_os_str().is_empty() { |
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131 if path.is_dir() { |
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132 config.add_trusted_dir(&path)? |
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133 } else { |
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134 config.add_trusted_file(&path)? |
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135 } |
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136 } |
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137 } |
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138 } |
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139 Ok(config) |
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140 } |
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141 |
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142 pub fn load_cli_args( |
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143 &mut self, |
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144 cli_config_args: impl IntoIterator<Item = impl AsRef<[u8]>>, |
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145 color_arg: Option<Vec<u8>>, |
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146 ) -> Result<(), ConfigError> { |
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147 if let Some(layer) = ConfigLayer::parse_cli_args(cli_config_args)? { |
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148 self.layers.push(layer) |
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149 } |
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150 if let Some(arg) = color_arg { |
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151 let mut layer = ConfigLayer::new(ConfigOrigin::CommandLineColor); |
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152 layer.add(b"ui"[..].into(), b"color"[..].into(), arg, None); |
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153 self.layers.push(layer) |
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154 } |
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155 Ok(()) |
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156 } |
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157 |
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158 fn add_trusted_dir(&mut self, path: &Path) -> Result<(), ConfigError> { |
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159 if let Some(entries) = std::fs::read_dir(path) |
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160 .when_reading_file(path) |
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161 .io_not_found_as_none()? |
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162 { |
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163 let mut file_paths = entries |
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164 .map(|result| { |
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165 result.when_reading_file(path).map(|entry| entry.path()) |
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166 }) |
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167 .collect::<Result<Vec<_>, _>>()?; |
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168 file_paths.sort(); |
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169 for file_path in &file_paths { |
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170 if file_path.extension() == Some(std::ffi::OsStr::new("rc")) { |
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171 self.add_trusted_file(&file_path)? |
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172 } |
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173 } |
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174 } |
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175 Ok(()) |
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176 } |
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177 |
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178 fn add_trusted_file(&mut self, path: &Path) -> Result<(), ConfigError> { |
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179 if let Some(data) = std::fs::read(path) |
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180 .when_reading_file(path) |
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181 .io_not_found_as_none()? |
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182 { |
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183 self.layers.extend(ConfigLayer::parse(path, &data)?) |
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184 } |
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185 Ok(()) |
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186 } |
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187 |
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188 fn add_for_environment_variable( |
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189 &mut self, |
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190 var: &str, |
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191 section: &[u8], |
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192 key: &[u8], |
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193 ) { |
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194 if let Some(value) = env::var_os(var) { |
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195 let origin = layer::ConfigOrigin::Environment(var.into()); |
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196 let mut layer = ConfigLayer::new(origin); |
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197 layer.add( |
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198 section.to_owned(), |
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199 key.to_owned(), |
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200 get_bytes_from_os_str(value), |
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201 None, |
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202 ); |
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203 self.layers.push(layer) |
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204 } |
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205 } |
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206 |
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207 #[cfg(unix)] // TODO: other platforms |
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208 fn add_system_config(&mut self) -> Result<(), ConfigError> { |
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209 let mut add_for_prefix = |prefix: &Path| -> Result<(), ConfigError> { |
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210 let etc = prefix.join("etc").join("mercurial"); |
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211 self.add_trusted_file(&etc.join("hgrc"))?; |
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212 self.add_trusted_dir(&etc.join("hgrc.d")) |
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213 }; |
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214 let root = Path::new("/"); |
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215 // TODO: use `std::env::args_os().next().unwrap()` a.k.a. argv[0] |
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216 // instead? TODO: can this be a relative path? |
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217 let hg = crate::utils::current_exe()?; |
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218 // TODO: this order (per-installation then per-system) matches |
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219 // `systemrcpath()` in `mercurial/scmposix.py`, but |
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220 // `mercurial/helptext/config.txt` suggests it should be reversed |
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221 if let Some(installation_prefix) = hg.parent().and_then(Path::parent) { |
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222 if installation_prefix != root { |
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223 add_for_prefix(&installation_prefix)? |
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224 } |
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225 } |
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226 add_for_prefix(root)?; |
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227 Ok(()) |
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228 } |
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229 |
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230 #[cfg(unix)] // TODO: other plateforms |
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231 fn add_user_config(&mut self) -> Result<(), ConfigError> { |
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232 let opt_home = home::home_dir(); |
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233 if let Some(home) = &opt_home { |
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234 self.add_trusted_file(&home.join(".hgrc"))? |
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235 } |
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236 let darwin = cfg!(any(target_os = "macos", target_os = "ios")); |
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237 if !darwin { |
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238 if let Some(config_home) = env::var_os("XDG_CONFIG_HOME") |
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239 .map(PathBuf::from) |
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240 .or_else(|| opt_home.map(|home| home.join(".config"))) |
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241 { |
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242 self.add_trusted_file(&config_home.join("hg").join("hgrc"))? |
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243 } |
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244 } |
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245 Ok(()) |
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246 } |
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247 |
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248 /// Loads in order, which means that the precedence is the same |
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249 /// as the order of `sources`. |
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250 pub fn load_from_explicit_sources( |
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251 sources: Vec<ConfigSource>, |
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252 ) -> Result<Self, ConfigError> { |
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253 let mut layers = vec![]; |
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254 |
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255 for source in sources.into_iter() { |
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256 match source { |
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257 ConfigSource::Parsed(c) => layers.push(c), |
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258 ConfigSource::AbsPath(c) => { |
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259 // TODO check if it should be trusted |
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260 // mercurial/ui.py:427 |
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261 let data = match std::fs::read(&c) { |
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262 Err(_) => continue, // same as the python code |
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263 Ok(data) => data, |
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264 }; |
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265 layers.extend(ConfigLayer::parse(&c, &data)?) |
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266 } |
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267 } |
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268 } |
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269 |
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270 Ok(Config { layers }) |
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271 } |
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272 |
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273 /// Loads the per-repository config into a new `Config` which is combined |
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274 /// with `self`. |
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275 pub(crate) fn combine_with_repo( |
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276 &self, |
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277 repo_config_files: &[PathBuf], |
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278 ) -> Result<Self, ConfigError> { |
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279 let (cli_layers, other_layers) = self |
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280 .layers |
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281 .iter() |
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282 .cloned() |
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283 .partition(ConfigLayer::is_from_command_line); |
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284 |
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285 let mut repo_config = Self { |
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286 layers: other_layers, |
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287 }; |
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288 for path in repo_config_files { |
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289 // TODO: check if this file should be trusted: |
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290 // `mercurial/ui.py:427` |
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291 repo_config.add_trusted_file(path)?; |
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292 } |
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293 repo_config.layers.extend(cli_layers); |
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294 Ok(repo_config) |
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295 } |
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296 |
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297 fn get_parse<'config, T: 'config>( |
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298 &'config self, |
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299 section: &[u8], |
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300 item: &[u8], |
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301 expected_type: &'static str, |
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302 parse: impl Fn(&'config [u8]) -> Option<T>, |
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303 ) -> Result<Option<T>, ConfigValueParseError> { |
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304 match self.get_inner(§ion, &item) { |
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305 Some((layer, v)) => match parse(&v.bytes) { |
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306 Some(b) => Ok(Some(b)), |
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307 None => Err(ConfigValueParseError { |
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308 origin: layer.origin.to_owned(), |
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309 line: v.line, |
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310 value: v.bytes.to_owned(), |
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311 section: section.to_owned(), |
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312 item: item.to_owned(), |
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313 expected_type, |
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314 }), |
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315 }, |
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316 None => Ok(None), |
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317 } |
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318 } |
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319 |
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320 /// Returns an `Err` if the first value found is not a valid UTF-8 string. |
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321 /// Otherwise, returns an `Ok(value)` if found, or `None`. |
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322 pub fn get_str( |
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323 &self, |
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324 section: &[u8], |
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325 item: &[u8], |
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326 ) -> Result<Option<&str>, ConfigValueParseError> { |
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327 self.get_parse(section, item, "ASCII or UTF-8 string", |value| { |
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328 str::from_utf8(value).ok() |
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329 }) |
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330 } |
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331 |
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332 /// Returns an `Err` if the first value found is not a valid unsigned |
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333 /// integer. Otherwise, returns an `Ok(value)` if found, or `None`. |
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334 pub fn get_u32( |
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335 &self, |
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336 section: &[u8], |
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337 item: &[u8], |
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338 ) -> Result<Option<u32>, ConfigValueParseError> { |
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339 self.get_parse(section, item, "valid integer", |value| { |
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340 str::from_utf8(value).ok()?.parse().ok() |
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341 }) |
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342 } |
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343 |
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344 /// Returns an `Err` if the first value found is not a valid file size |
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345 /// value such as `30` (default unit is bytes), `7 MB`, or `42.5 kb`. |
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346 /// Otherwise, returns an `Ok(value_in_bytes)` if found, or `None`. |
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347 pub fn get_byte_size( |
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348 &self, |
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349 section: &[u8], |
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350 item: &[u8], |
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351 ) -> Result<Option<u64>, ConfigValueParseError> { |
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352 self.get_parse(section, item, "byte quantity", values::parse_byte_size) |
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353 } |
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354 |
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355 /// Returns an `Err` if the first value found is not a valid boolean. |
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356 /// Otherwise, returns an `Ok(option)`, where `option` is the boolean if |
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357 /// found, or `None`. |
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358 pub fn get_option( |
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359 &self, |
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360 section: &[u8], |
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361 item: &[u8], |
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362 ) -> Result<Option<bool>, ConfigValueParseError> { |
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363 self.get_parse(section, item, "boolean", values::parse_bool) |
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364 } |
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365 |
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366 /// Returns the corresponding boolean in the config. Returns `Ok(false)` |
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367 /// if the value is not found, an `Err` if it's not a valid boolean. |
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368 pub fn get_bool( |
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369 &self, |
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370 section: &[u8], |
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371 item: &[u8], |
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372 ) -> Result<bool, ConfigValueParseError> { |
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373 Ok(self.get_option(section, item)?.unwrap_or(false)) |
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374 } |
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375 |
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376 /// Returns `true` if the extension is enabled, `false` otherwise |
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377 pub fn is_extension_enabled(&self, extension: &[u8]) -> bool { |
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378 let value = self.get(b"extensions", extension); |
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379 match value { |
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380 Some(c) => !c.starts_with(b"!"), |
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381 None => false, |
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382 } |
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383 } |
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384 |
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385 /// If there is an `item` value in `section`, parse and return a list of |
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386 /// byte strings. |
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387 pub fn get_list( |
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388 &self, |
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389 section: &[u8], |
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390 item: &[u8], |
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391 ) -> Option<Vec<Vec<u8>>> { |
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392 self.get(section, item).map(values::parse_list) |
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393 } |
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394 |
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395 /// Returns the raw value bytes of the first one found, or `None`. |
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396 pub fn get(&self, section: &[u8], item: &[u8]) -> Option<&[u8]> { |
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397 self.get_inner(section, item) |
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398 .map(|(_, value)| value.bytes.as_ref()) |
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399 } |
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400 |
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401 /// Returns the raw value bytes of the first one found, or `None`. |
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402 pub fn get_with_origin( |
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403 &self, |
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404 section: &[u8], |
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405 item: &[u8], |
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406 ) -> Option<(&[u8], &ConfigOrigin)> { |
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407 self.get_inner(section, item) |
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408 .map(|(layer, value)| (value.bytes.as_ref(), &layer.origin)) |
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409 } |
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410 |
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411 /// Returns the layer and the value of the first one found, or `None`. |
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412 fn get_inner( |
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413 &self, |
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414 section: &[u8], |
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415 item: &[u8], |
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416 ) -> Option<(&ConfigLayer, &ConfigValue)> { |
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417 for layer in self.layers.iter().rev() { |
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418 if !layer.trusted { |
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419 continue; |
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420 } |
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421 if let Some(v) = layer.get(§ion, &item) { |
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422 return Some((&layer, v)); |
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423 } |
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424 } |
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425 None |
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426 } |
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427 |
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428 /// Return all keys defined for the given section |
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429 pub fn get_section_keys(&self, section: &[u8]) -> HashSet<&[u8]> { |
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430 self.layers |
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431 .iter() |
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432 .flat_map(|layer| layer.iter_keys(section)) |
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433 .collect() |
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434 } |
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435 |
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436 /// Returns whether any key is defined in the given section |
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437 pub fn has_non_empty_section(&self, section: &[u8]) -> bool { |
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438 self.layers |
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439 .iter() |
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440 .any(|layer| layer.has_non_empty_section(section)) |
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441 } |
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442 |
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443 /// Yields (key, value) pairs for everything in the given section |
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444 pub fn iter_section<'a>( |
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445 &'a self, |
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446 section: &'a [u8], |
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447 ) -> impl Iterator<Item = (&[u8], &[u8])> + 'a { |
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448 // TODO: Use `Iterator`’s `.peekable()` when its `peek_mut` is |
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449 // available: |
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450 // https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.peek_mut |
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451 struct Peekable<I: Iterator> { |
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452 iter: I, |
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453 /// Remember a peeked value, even if it was None. |
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454 peeked: Option<Option<I::Item>>, |
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455 } |
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456 |
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457 impl<I: Iterator> Peekable<I> { |
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458 fn new(iter: I) -> Self { |
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459 Self { iter, peeked: None } |
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460 } |
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461 |
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462 fn next(&mut self) { |
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463 self.peeked = None |
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464 } |
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465 |
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466 fn peek_mut(&mut self) -> Option<&mut I::Item> { |
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467 let iter = &mut self.iter; |
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468 self.peeked.get_or_insert_with(|| iter.next()).as_mut() |
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469 } |
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470 } |
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471 |
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472 // Deduplicate keys redefined in multiple layers |
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473 let mut keys_already_seen = HashSet::new(); |
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474 let mut key_is_new = |
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475 move |&(key, _value): &(&'a [u8], &'a [u8])| -> bool { |
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476 keys_already_seen.insert(key) |
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477 }; |
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478 // This is similar to `flat_map` + `filter_map`, except with a single |
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479 // closure that owns `key_is_new` (and therefore the |
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480 // `keys_already_seen` set): |
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481 let mut layer_iters = Peekable::new( |
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482 self.layers |
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483 .iter() |
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484 .rev() |
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485 .map(move |layer| layer.iter_section(section)), |
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486 ); |
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487 std::iter::from_fn(move || loop { |
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488 if let Some(pair) = layer_iters.peek_mut()?.find(&mut key_is_new) { |
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489 return Some(pair); |
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490 } else { |
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491 layer_iters.next(); |
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492 } |
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493 }) |
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494 } |
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495 |
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496 /// Get raw values bytes from all layers (even untrusted ones) in order |
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497 /// of precedence. |
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498 #[cfg(test)] |
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499 fn get_all(&self, section: &[u8], item: &[u8]) -> Vec<&[u8]> { |
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500 let mut res = vec![]; |
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501 for layer in self.layers.iter().rev() { |
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502 if let Some(v) = layer.get(§ion, &item) { |
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503 res.push(v.bytes.as_ref()); |
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504 } |
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505 } |
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506 res |
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507 } |
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508 } |
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509 |
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510 #[cfg(test)] |
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511 mod tests { |
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512 use super::*; |
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513 use pretty_assertions::assert_eq; |
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514 use std::fs::File; |
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515 use std::io::Write; |
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516 |
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517 #[test] |
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518 fn test_include_layer_ordering() { |
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519 let tmpdir = tempfile::tempdir().unwrap(); |
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520 let tmpdir_path = tmpdir.path(); |
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521 let mut included_file = |
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522 File::create(&tmpdir_path.join("included.rc")).unwrap(); |
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523 |
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524 included_file.write_all(b"[section]\nitem=value1").unwrap(); |
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525 let base_config_path = tmpdir_path.join("base.rc"); |
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526 let mut config_file = File::create(&base_config_path).unwrap(); |
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527 let data = |
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528 b"[section]\nitem=value0\n%include included.rc\nitem=value2\n\ |
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529 [section2]\ncount = 4\nsize = 1.5 KB\nnot-count = 1.5\nnot-size = 1 ub"; |
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530 config_file.write_all(data).unwrap(); |
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531 |
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532 let sources = vec![ConfigSource::AbsPath(base_config_path)]; |
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533 let config = Config::load_from_explicit_sources(sources) |
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534 .expect("expected valid config"); |
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535 |
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536 let (_, value) = config.get_inner(b"section", b"item").unwrap(); |
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537 assert_eq!( |
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538 value, |
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539 &ConfigValue { |
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540 bytes: b"value2".to_vec(), |
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541 line: Some(4) |
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542 } |
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543 ); |
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544 |
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545 let value = config.get(b"section", b"item").unwrap(); |
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546 assert_eq!(value, b"value2",); |
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547 assert_eq!( |
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548 config.get_all(b"section", b"item"), |
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549 [b"value2", b"value1", b"value0"] |
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550 ); |
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551 |
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552 assert_eq!(config.get_u32(b"section2", b"count").unwrap(), Some(4)); |
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553 assert_eq!( |
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554 config.get_byte_size(b"section2", b"size").unwrap(), |
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555 Some(1024 + 512) |
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556 ); |
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557 assert!(config.get_u32(b"section2", b"not-count").is_err()); |
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558 assert!(config.get_byte_size(b"section2", b"not-size").is_err()); |
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559 } |
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560 } |