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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 glob;
use regex::Regex;
use std::fs::File;
use std::io::{BufRead, BufReader, Result};
use std::path::{Path, PathBuf};
/// 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> {
lazy_static! {
static ref RE: Regex = Regex::new(
r"(?x)
^\s*
(!)? # 1 : negation
(.+?) # 2 : pattern
(/)? # 3 : directory
\s*$
"
)
.unwrap();
}
if line.starts_with('#') {
return None; // comment line
}
if let Some(c) = RE.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.
pub struct GitIgnoreFilter {
pub files: Vec<GitIgnoreFile>, // the last one is the deepest one
}
impl GitIgnoreFilter {
pub fn applicable_to(path: &Path) -> GitIgnoreFilter {
let mut filter = GitIgnoreFilter { files: Vec::new() };
for ignore_file in GitIgnoreFilesFinder::for_dir(path) {
match GitIgnoreFile::new(&ignore_file) {
Ok(gif) => {
filter.files.push(gif);
}
Err(e) => {
info!("reading GIF failed: {:?}", e);
}
}
}
filter
}
pub fn extended_to(&self, dir: &Path) -> GitIgnoreFilter {
let mut files = self.files.clone();
let ignore_file = dir.join(".gitignore");
if let Ok(gif) = GitIgnoreFile::new(&ignore_file) {
files.push(gif);
}
GitIgnoreFilter { files }
}
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
}
}
/// an iterator to find all applicable git_ignore files
pub struct GitIgnoreFilesFinder<'a> {
dir: &'a Path,
}
impl<'a> GitIgnoreFilesFinder<'a> {
fn for_dir(dir: &'a Path) -> GitIgnoreFilesFinder<'a> {
GitIgnoreFilesFinder { dir }
}
}
impl<'a> Iterator for GitIgnoreFilesFinder<'a> {
type Item = PathBuf; // I don't really see a way to deal with only &'a Path as join makes a PathBuf
fn next(&mut self) -> Option<PathBuf> {
loop {
let ignore_file = self.dir.join(".gitignore");
match self.dir.parent() {
Some(parent) => {
self.dir = parent;
if ignore_file.exists() {
return Some(ignore_file);
}
}
None => {
return None;
}
}
}
}
}
|
