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annotate rust/hg-core/src/config/layer.rs @ 46504:2e5dd18d6dc3

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rhg: Add support for --config CLI arguments Differential Revision: https://phab.mercurial-scm.org/D9971
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 08 Feb 2021 23:08:44 +0100
parents eace48b4a786
children a25033eb43b5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 // layer.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 crate::errors::{HgError, IoResultExt};
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11 use crate::utils::files::{get_bytes_from_path, get_path_from_bytes};
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12 use format_bytes::{write_bytes, DisplayBytes};
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13 use lazy_static::lazy_static;
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14 use regex::bytes::Regex;
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15 use std::collections::HashMap;
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16 use std::path::{Path, PathBuf};
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17
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18 lazy_static! {
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19 static ref SECTION_RE: Regex = make_regex(r"^\[([^\[]+)\]");
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20 static ref ITEM_RE: Regex = make_regex(r"^([^=\s][^=]*?)\s*=\s*((.*\S)?)");
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21 /// Continuation whitespace
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22 static ref CONT_RE: Regex = make_regex(r"^\s+(\S|\S.*\S)\s*$");
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23 static ref EMPTY_RE: Regex = make_regex(r"^(;|#|\s*$)");
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24 static ref COMMENT_RE: Regex = make_regex(r"^(;|#)");
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25 /// A directive that allows for removing previous entries
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26 static ref UNSET_RE: Regex = make_regex(r"^%unset\s+(\S+)");
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27 /// A directive that allows for including other config files
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28 static ref INCLUDE_RE: Regex = make_regex(r"^%include\s+(\S|\S.*\S)\s*$");
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29 }
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30
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31 /// All config values separated by layers of precedence.
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32 /// Each config source may be split in multiple layers if `%include` directives
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33 /// are used.
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34 /// TODO detail the general precedence
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35 #[derive(Clone)]
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36 pub struct ConfigLayer {
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37 /// Mapping of the sections to their items
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38 sections: HashMap<Vec<u8>, ConfigItem>,
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39 /// All sections (and their items/values) in a layer share the same origin
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40 pub origin: ConfigOrigin,
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41 /// Whether this layer comes from a trusted user or group
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42 pub trusted: bool,
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43 }
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44
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45 impl ConfigLayer {
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46 pub fn new(origin: ConfigOrigin) -> Self {
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47 ConfigLayer {
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48 sections: HashMap::new(),
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49 trusted: true, // TODO check
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50 origin,
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51 }
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52 }
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53
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54 /// Parse `--config` CLI arguments and return a layer if there’s any
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55 pub(crate) fn parse_cli_args(
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56 cli_config_args: impl IntoIterator<Item = impl AsRef<[u8]>>,
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57 ) -> Result<Option<Self>, ConfigError> {
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58 fn parse_one(arg: &[u8]) -> Option<(Vec<u8>, Vec<u8>, Vec<u8>)> {
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59 use crate::utils::SliceExt;
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60
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61 let (section_and_item, value) = split_2(arg, b'=')?;
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62 let (section, item) = split_2(section_and_item.trim(), b'.')?;
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63 Some((
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64 section.to_owned(),
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65 item.to_owned(),
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66 value.trim().to_owned(),
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67 ))
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68 }
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69
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70 fn split_2(bytes: &[u8], separator: u8) -> Option<(&[u8], &[u8])> {
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71 let mut iter = bytes.splitn(2, |&byte| byte == separator);
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72 let a = iter.next()?;
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73 let b = iter.next()?;
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74 Some((a, b))
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75 }
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76
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77 let mut layer = Self::new(ConfigOrigin::CommandLine);
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78 for arg in cli_config_args {
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79 let arg = arg.as_ref();
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80 if let Some((section, item, value)) = parse_one(arg) {
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81 layer.add(section, item, value, None);
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82 } else {
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83 Err(HgError::abort(format!(
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84 "malformed --config option: \"{}\" \
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85 (use --config section.name=value)",
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86 String::from_utf8_lossy(arg),
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87 )))?
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88 }
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89 }
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90 if layer.sections.is_empty() {
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91 Ok(None)
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92 } else {
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93 Ok(Some(layer))
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94 }
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95 }
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96
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97 /// Returns whether this layer comes from `--config` CLI arguments
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98 pub(crate) fn is_from_command_line(&self) -> bool {
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99 if let ConfigOrigin::CommandLine = self.origin {
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100 true
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101 } else {
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102 false
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103 }
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104 }
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105
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106 /// Add an entry to the config, overwriting the old one if already present.
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107 pub fn add(
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108 &mut self,
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109 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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122 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(&section) {
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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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226 b"{}.{}={} # {}\n",
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227 section,
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228 item,
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229 &config_entry.bytes,
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230 &self.origin,
46187
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231 )?
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232 }
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233 }
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234 Ok(())
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235 }
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236 }
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237
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238 /// Mapping of section item to value.
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239 /// In the following:
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240 /// ```text
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241 /// [ui]
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242 /// paginate=no
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243 /// ```
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244 /// "paginate" is the section item and "no" the value.
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245 pub type ConfigItem = HashMap<Vec<u8>, ConfigValue>;
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246
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247 #[derive(Clone, Debug, PartialEq)]
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248 pub struct ConfigValue {
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249 /// The raw bytes of the value (be it from the CLI, env or from a file)
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250 pub bytes: Vec<u8>,
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251 /// Only present if the value comes from a file, 1-indexed.
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252 pub line: Option<usize>,
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253 }
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254
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255 #[derive(Clone, Debug)]
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256 pub enum ConfigOrigin {
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257 /// From a configuration file
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258 File(PathBuf),
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259 /// From a `--config` CLI argument
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260 CommandLine,
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261 /// From environment variables like `$PAGER` or `$EDITOR`
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262 Environment(Vec<u8>),
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263 /* TODO cli
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264 * TODO defaults (configitems.py)
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265 * TODO extensions
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266 * TODO Python resources?
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267 * Others? */
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268 }
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269
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270 impl DisplayBytes for ConfigOrigin {
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271 fn display_bytes(
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272 &self,
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273 out: &mut dyn std::io::Write,
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274 ) -> std::io::Result<()> {
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275 match self {
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276 ConfigOrigin::File(p) => out.write_all(&get_bytes_from_path(p)),
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277 ConfigOrigin::CommandLine => out.write_all(b"--config"),
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278 ConfigOrigin::Environment(e) => write_bytes!(out, b"${}", e),
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279 }
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280 }
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281 }
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282
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283 #[derive(Debug)]
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284 pub struct ConfigParseError {
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285 pub origin: ConfigOrigin,
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286 pub line: Option<usize>,
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287 pub bytes: Vec<u8>,
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288 }
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289
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290 #[derive(Debug, derive_more::From)]
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291 pub enum ConfigError {
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292 Parse(ConfigParseError),
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293 Other(HgError),
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294 }
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295
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296 fn make_regex(pattern: &'static str) -> Regex {
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297 Regex::new(pattern).expect("expected a valid regex")
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298 }