author | Simon Sapin <simon.sapin@octobus.net> |
Mon, 08 Feb 2021 23:08:44 +0100 | |
changeset 46504 | 2e5dd18d6dc3 |
parent 46499 | eace48b4a786 |
child 46505 | a25033eb43b5 |
permissions | -rw-r--r-- |
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// layer.rs |
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// |
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// Copyright 2020 |
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// Valentin Gatien-Baron, |
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// Raphaël Gomès <rgomes@octobus.net> |
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// |
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// This software may be used and distributed according to the terms of the |
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// GNU General Public License version 2 or any later version. |
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use crate::errors::{HgError, IoResultExt}; |
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use crate::utils::files::{get_bytes_from_path, get_path_from_bytes}; |
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use format_bytes::{write_bytes, DisplayBytes}; |
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use lazy_static::lazy_static; |
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use regex::bytes::Regex; |
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use std::collections::HashMap; |
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use std::path::{Path, PathBuf}; |
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lazy_static! { |
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static ref SECTION_RE: Regex = make_regex(r"^\[([^\[]+)\]"); |
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static ref ITEM_RE: Regex = make_regex(r"^([^=\s][^=]*?)\s*=\s*((.*\S)?)"); |
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/// Continuation whitespace |
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static ref CONT_RE: Regex = make_regex(r"^\s+(\S|\S.*\S)\s*$"); |
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static ref EMPTY_RE: Regex = make_regex(r"^(;|#|\s*$)"); |
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static ref COMMENT_RE: Regex = make_regex(r"^(;|#)"); |
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/// A directive that allows for removing previous entries |
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static ref UNSET_RE: Regex = make_regex(r"^%unset\s+(\S+)"); |
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/// A directive that allows for including other config files |
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static ref INCLUDE_RE: Regex = make_regex(r"^%include\s+(\S|\S.*\S)\s*$"); |
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} |
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/// All config values separated by layers of precedence. |
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/// Each config source may be split in multiple layers if `%include` directives |
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/// are used. |
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/// TODO detail the general precedence |
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#[derive(Clone)] |
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pub struct ConfigLayer { |
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/// Mapping of the sections to their items |
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sections: HashMap<Vec<u8>, ConfigItem>, |
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/// All sections (and their items/values) in a layer share the same origin |
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pub origin: ConfigOrigin, |
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/// Whether this layer comes from a trusted user or group |
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pub trusted: bool, |
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} |
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impl ConfigLayer { |
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pub fn new(origin: ConfigOrigin) -> Self { |
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ConfigLayer { |
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sections: HashMap::new(), |
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trusted: true, // TODO check |
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origin, |
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} |
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} |
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/// Parse `--config` CLI arguments and return a layer if there’s any |
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pub(crate) fn parse_cli_args( |
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cli_config_args: impl IntoIterator<Item = impl AsRef<[u8]>>, |
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) -> Result<Option<Self>, ConfigError> { |
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fn parse_one(arg: &[u8]) -> Option<(Vec<u8>, Vec<u8>, Vec<u8>)> { |
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use crate::utils::SliceExt; |
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let (section_and_item, value) = split_2(arg, b'=')?; |
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let (section, item) = split_2(section_and_item.trim(), b'.')?; |
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Some(( |
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section.to_owned(), |
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item.to_owned(), |
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value.trim().to_owned(), |
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)) |
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} |
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fn split_2(bytes: &[u8], separator: u8) -> Option<(&[u8], &[u8])> { |
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let mut iter = bytes.splitn(2, |&byte| byte == separator); |
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let a = iter.next()?; |
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let b = iter.next()?; |
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Some((a, b)) |
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} |
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let mut layer = Self::new(ConfigOrigin::CommandLine); |
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for arg in cli_config_args { |
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let arg = arg.as_ref(); |
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if let Some((section, item, value)) = parse_one(arg) { |
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layer.add(section, item, value, None); |
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} else { |
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Err(HgError::abort(format!( |
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"malformed --config option: \"{}\" \ |
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(use --config section.name=value)", |
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String::from_utf8_lossy(arg), |
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)))? |
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} |
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} |
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if layer.sections.is_empty() { |
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Ok(None) |
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} else { |
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Ok(Some(layer)) |
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} |
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} |
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/// Returns whether this layer comes from `--config` CLI arguments |
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pub(crate) fn is_from_command_line(&self) -> bool { |
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if let ConfigOrigin::CommandLine = self.origin { |
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true |
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} else { |
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false |
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} |
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} |
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/// Add an entry to the config, overwriting the old one if already present. |
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pub fn add( |
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&mut self, |
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section: Vec<u8>, |
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110 |
item: Vec<u8>, |
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111 |
value: Vec<u8>, |
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112 |
line: Option<usize>, |
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113 |
) { |
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114 |
self.sections |
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115 |
.entry(section) |
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116 |
.or_insert_with(|| HashMap::new()) |
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117 |
.insert(item, ConfigValue { bytes: value, line }); |
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118 |
} |
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119 |
|
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120 |
/// Returns the config value in `<section>.<item>` if it exists |
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121 |
pub fn get(&self, section: &[u8], item: &[u8]) -> Option<&ConfigValue> { |
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Some(self.sections.get(section)?.get(item)?) |
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123 |
} |
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124 |
|
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125 |
pub fn is_empty(&self) -> bool { |
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126 |
self.sections.is_empty() |
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127 |
} |
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128 |
|
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129 |
/// Returns a `Vec` of layers in order of precedence (so, in read order), |
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130 |
/// recursively parsing the `%include` directives if any. |
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131 |
pub fn parse(src: &Path, data: &[u8]) -> Result<Vec<Self>, ConfigError> { |
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132 |
let mut layers = vec![]; |
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133 |
|
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134 |
// Discard byte order mark if any |
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135 |
let data = if data.starts_with(b"\xef\xbb\xbf") { |
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136 |
&data[3..] |
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137 |
} else { |
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138 |
data |
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139 |
}; |
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140 |
|
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141 |
// TODO check if it's trusted |
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142 |
let mut current_layer = Self::new(ConfigOrigin::File(src.to_owned())); |
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143 |
|
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144 |
let mut lines_iter = |
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145 |
data.split(|b| *b == b'\n').enumerate().peekable(); |
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146 |
let mut section = b"".to_vec(); |
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147 |
|
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148 |
while let Some((index, bytes)) = lines_iter.next() { |
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149 |
if let Some(m) = INCLUDE_RE.captures(&bytes) { |
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150 |
let filename_bytes = &m[1]; |
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151 |
// `Path::parent` only fails for the root directory, |
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152 |
// which `src` can’t be since we’ve managed to open it as a |
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153 |
// file. |
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154 |
let dir = src |
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155 |
.parent() |
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156 |
.expect("Path::parent fail on a file we’ve read"); |
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157 |
// `Path::join` with an absolute argument correctly ignores the |
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158 |
// base path |
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159 |
let filename = dir.join(&get_path_from_bytes(&filename_bytes)); |
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160 |
let data = std::fs::read(&filename).for_file(&filename)?; |
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161 |
layers.push(current_layer); |
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162 |
layers.extend(Self::parse(&filename, &data)?); |
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163 |
current_layer = Self::new(ConfigOrigin::File(src.to_owned())); |
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164 |
} else if let Some(_) = EMPTY_RE.captures(&bytes) { |
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165 |
} else if let Some(m) = SECTION_RE.captures(&bytes) { |
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166 |
section = m[1].to_vec(); |
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167 |
} else if let Some(m) = ITEM_RE.captures(&bytes) { |
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168 |
let item = m[1].to_vec(); |
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169 |
let mut value = m[2].to_vec(); |
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170 |
loop { |
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171 |
match lines_iter.peek() { |
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172 |
None => break, |
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173 |
Some((_, v)) => { |
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174 |
if let Some(_) = COMMENT_RE.captures(&v) { |
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175 |
} else if let Some(_) = CONT_RE.captures(&v) { |
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176 |
value.extend(b"\n"); |
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177 |
value.extend(&m[1]); |
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178 |
} else { |
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179 |
break; |
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180 |
} |
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181 |
} |
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182 |
}; |
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183 |
lines_iter.next(); |
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184 |
} |
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185 |
current_layer.add( |
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186 |
section.clone(), |
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187 |
item, |
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188 |
value, |
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189 |
Some(index + 1), |
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190 |
); |
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191 |
} else if let Some(m) = UNSET_RE.captures(&bytes) { |
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192 |
if let Some(map) = current_layer.sections.get_mut(§ion) { |
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193 |
map.remove(&m[1]); |
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194 |
} |
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195 |
} else { |
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196 |
return Err(ConfigParseError { |
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197 |
origin: ConfigOrigin::File(src.to_owned()), |
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198 |
line: Some(index + 1), |
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199 |
bytes: bytes.to_owned(), |
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200 |
} |
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201 |
.into()); |
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202 |
} |
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203 |
} |
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204 |
if !current_layer.is_empty() { |
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205 |
layers.push(current_layer); |
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206 |
} |
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207 |
Ok(layers) |
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208 |
} |
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209 |
} |
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210 |
|
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211 |
impl DisplayBytes for ConfigLayer { |
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212 |
fn display_bytes( |
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213 |
&self, |
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214 |
out: &mut dyn std::io::Write, |
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215 |
) -> std::io::Result<()> { |
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216 |
let mut sections: Vec<_> = self.sections.iter().collect(); |
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217 |
sections.sort_by(|e0, e1| e0.0.cmp(e1.0)); |
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218 |
|
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219 |
for (section, items) in sections.into_iter() { |
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220 |
let mut items: Vec<_> = items.into_iter().collect(); |
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221 |
items.sort_by(|e0, e1| e0.0.cmp(e1.0)); |
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222 |
|
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223 |
for (item, config_entry) in items { |
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224 |
write_bytes!( |
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225 |
out, |
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b"{}.{}={} # {}\n", |
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section, |
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item, |
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&config_entry.bytes, |
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&self.origin, |
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)? |
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} |
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} |
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Ok(()) |
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} |
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} |
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/// Mapping of section item to value. |
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/// In the following: |
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/// ```text |
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/// [ui] |
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/// paginate=no |
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/// ``` |
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/// "paginate" is the section item and "no" the value. |
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pub type ConfigItem = HashMap<Vec<u8>, ConfigValue>; |
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|
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#[derive(Clone, Debug, PartialEq)] |
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pub struct ConfigValue { |
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/// The raw bytes of the value (be it from the CLI, env or from a file) |
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pub bytes: Vec<u8>, |
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/// Only present if the value comes from a file, 1-indexed. |
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pub line: Option<usize>, |
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} |
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#[derive(Clone, Debug)] |
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pub enum ConfigOrigin { |
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/// From a configuration file |
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File(PathBuf), |
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/// From a `--config` CLI argument |
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CommandLine, |
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/// From environment variables like `$PAGER` or `$EDITOR` |
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Environment(Vec<u8>), |
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/* TODO cli |
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* TODO defaults (configitems.py) |
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* TODO extensions |
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* TODO Python resources? |
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* Others? */ |
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} |
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impl DisplayBytes for ConfigOrigin { |
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fn display_bytes( |
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&self, |
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out: &mut dyn std::io::Write, |
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) -> std::io::Result<()> { |
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match self { |
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ConfigOrigin::File(p) => out.write_all(&get_bytes_from_path(p)), |
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ConfigOrigin::CommandLine => out.write_all(b"--config"), |
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ConfigOrigin::Environment(e) => write_bytes!(out, b"${}", e), |
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} |
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} |
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} |
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#[derive(Debug)] |
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pub struct ConfigParseError { |
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pub origin: ConfigOrigin, |
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pub line: Option<usize>, |
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pub bytes: Vec<u8>, |
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} |
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|
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#[derive(Debug, derive_more::From)] |
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pub enum ConfigError { |
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Parse(ConfigParseError), |
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Other(HgError), |
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} |
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fn make_regex(pattern: &'static str) -> Regex { |
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Regex::new(pattern).expect("expected a valid regex") |
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} |