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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) = arg.split_2(b'=')?;
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let (section, item) = section_and_item.trim().split_2(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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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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item: Vec<u8>,
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value: Vec<u8>,
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line: Option<usize>,
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) {
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self.sections
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.entry(section)
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.or_insert_with(|| HashMap::new())
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.insert(item, ConfigValue { bytes: value, line });
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}
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/// Returns the config value in `<section>.<item>` if it exists
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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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}
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pub fn is_empty(&self) -> bool {
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self.sections.is_empty()
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}
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/// Returns a `Vec` of layers in order of precedence (so, in read order),
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/// recursively parsing the `%include` directives if any.
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pub fn parse(src: &Path, data: &[u8]) -> Result<Vec<Self>, ConfigError> {
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let mut layers = vec![];
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// Discard byte order mark if any
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let data = if data.starts_with(b"\xef\xbb\xbf") {
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&data[3..]
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} else {
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data
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};
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// TODO check if it's trusted
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let mut current_layer = Self::new(ConfigOrigin::File(src.to_owned()));
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let mut lines_iter =
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data.split(|b| *b == b'\n').enumerate().peekable();
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let mut section = b"".to_vec();
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while let Some((index, bytes)) = lines_iter.next() {
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if let Some(m) = INCLUDE_RE.captures(&bytes) {
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let filename_bytes = &m[1];
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// `Path::parent` only fails for the root directory,
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// which `src` can’t be since we’ve managed to open it as a
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// file.
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let dir = src
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.parent()
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.expect("Path::parent fail on a file we’ve read");
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// `Path::join` with an absolute argument correctly ignores the
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// base path
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let filename = dir.join(&get_path_from_bytes(&filename_bytes));
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let data = std::fs::read(&filename).for_file(&filename)?;
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layers.push(current_layer);
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layers.extend(Self::parse(&filename, &data)?);
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current_layer = Self::new(ConfigOrigin::File(src.to_owned()));
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} else if let Some(_) = EMPTY_RE.captures(&bytes) {
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} else if let Some(m) = SECTION_RE.captures(&bytes) {
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section = m[1].to_vec();
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} else if let Some(m) = ITEM_RE.captures(&bytes) {
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let item = m[1].to_vec();
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let mut value = m[2].to_vec();
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loop {
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match lines_iter.peek() {
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None => break,
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Some((_, v)) => {
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if let Some(_) = COMMENT_RE.captures(&v) {
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} else if let Some(_) = CONT_RE.captures(&v) {
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value.extend(b"\n");
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value.extend(&m[1]);
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} else {
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break;
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}
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}
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};
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lines_iter.next();
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}
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current_layer.add(
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section.clone(),
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item,
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value,
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Some(index + 1),
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);
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} else if let Some(m) = UNSET_RE.captures(&bytes) {
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if let Some(map) = current_layer.sections.get_mut(§ion) {
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map.remove(&m[1]);
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}
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} else {
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return Err(ConfigParseError {
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origin: ConfigOrigin::File(src.to_owned()),
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line: Some(index + 1),
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bytes: bytes.to_owned(),
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}
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.into());
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}
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}
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if !current_layer.is_empty() {
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layers.push(current_layer);
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}
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Ok(layers)
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}
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}
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impl DisplayBytes for ConfigLayer {
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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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let mut sections: Vec<_> = self.sections.iter().collect();
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sections.sort_by(|e0, e1| e0.0.cmp(e1.0));
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for (section, items) in sections.into_iter() {
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let mut items: Vec<_> = items.into_iter().collect();
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items.sort_by(|e0, e1| e0.0.cmp(e1.0));
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for (item, config_entry) in items {
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write_bytes!(
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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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#[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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#[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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}
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