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|
//! Implements parsing and applying .gitignore files.
//! Also manages a stack of such files, because more than one
//! can apply for a dir (i.e when entering a directory we
//! may add a gitignore file to the stack)
use std::{
fs::File,
io::{BufRead, BufReader, Result},
path::Path,
};
use glob;
use regex::Regex;
/// a simple rule of a gitignore file
#[derive(Clone)]
struct GitIgnoreRule {
ok: bool, // does this rule when matched means the file is good? (usually false)
directory: bool, // whether this rule only applies to directories
filename: bool, // does this rule apply to just the filename
pattern: glob::Pattern,
pattern_options: glob::MatchOptions,
}
impl GitIgnoreRule {
fn from(line: &str, dir: &Path) -> Option<GitIgnoreRule> {
if line.starts_with('#') {
return None; // comment line
}
let r = regex!(
r"(?x)
^\s*
(!)? # 1 : negation
(.+?) # 2 : pattern
(/)? # 3 : directory
\s*$
"
);
if let Some(c) = r.captures(line) {
if let Some(p) = c.get(2) {
let mut p = p.as_str().to_string();
let has_separator = p.contains('/');
if has_separator && p.starts_with('/') {
p = dir.to_string_lossy().to_string() + &p;
}
if let Ok(pattern) = glob::Pattern::new(&p) {
let pattern_options = glob::MatchOptions {
case_sensitive: true, // not really sure about this one
require_literal_leading_dot: false,
require_literal_separator: has_separator,
};
return Some(GitIgnoreRule {
ok: c.get(1).is_some(), // if negation
pattern,
directory: c.get(3).is_some(),
filename: !has_separator,
pattern_options,
});
}
}
}
None
}
}
/// The rules of a gitignore file
#[derive(Clone)]
pub struct GitIgnoreFile {
rules: Vec<GitIgnoreRule>,
}
impl GitIgnoreFile {
pub fn new(path: &Path) -> Result<GitIgnoreFile> {
let f = File::open(path)?;
let parent = path.parent().unwrap();
let mut rules: Vec<GitIgnoreRule> = Vec::new();
for line in BufReader::new(f).lines() {
if let Some(rule) = GitIgnoreRule::from(&line?, &parent) {
rules.push(rule);
}
}
// the last rule applicable to a path is the right one. So
// we reverse the list to easily iterate from the last one to the first one
rules.reverse();
debug!(
"loaded .gitignore file {:?} with {} rules",
path,
rules.len()
);
Ok(GitIgnoreFile { rules })
}
}
/// A stack of the gitignore files applying to a directory.
#[derive(Clone)]
pub struct GitIgnoreFilter {
pub files: Vec<GitIgnoreFile>, // the last one is the deepest one
}
impl GitIgnoreFilter {
pub fn applicable_to(mut dir: &Path) -> GitIgnoreFilter {
let mut filter = GitIgnoreFilter { files: Vec::new() };
debug!("searching applicable gifs for {:?}", dir);
loop {
debug!(" looking in {:?}", dir);
let ignore_file = dir.join(".gitignore");
if let Ok(gif) = GitIgnoreFile::new(&ignore_file) {
debug!(" adding {:?}", &ignore_file);
filter.files.push(gif);
}
if is_git_repo(dir) {
debug!(" break because git repo");
break;
}
if let Some(parent) = dir.parent() {
dir = parent;
} else {
break;
}
}
filter
}
pub fn extended_to(
&self,
dir: &Path,
) -> GitIgnoreFilter {
let ignore_file = dir.join(".gitignore");
if let Ok(gif) = GitIgnoreFile::new(&ignore_file) {
// if the current folder is a repository, then
// we reset the chain: we don't want the .gitignore
// files of super repositories
// (see https://github.com/Canop/broot/issues/160)
let mut files = if is_git_repo(dir) { // we'll assume it's a .git folder
debug!("entering a git repo {:?}", dir);
self.files.clone()
} else {
debug!("subfolder {:?} in same repo", dir);
Vec::new()
};
files.push(gif);
GitIgnoreFilter { files }
} else {
self.clone()
}
}
pub fn accepts(&self, path: &Path, filename: &str, directory: bool) -> bool {
for file in &self.files {
for rule in &file.rules {
if rule.directory && !directory {
continue;
}
let ok = if rule.filename {
rule.pattern.matches_with(filename, rule.pattern_options)
} else {
rule.pattern.matches_path_with(path, rule.pattern_options)
};
if ok {
return rule.ok;
}
}
}
true
}
}
fn is_git_repo(dir: &Path) -> bool {
dir.join(".git").exists()
}
|
