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use std::{
fs::{self, File, ReadDir},
io::{self, BufRead, BufReader, Error, ErrorKind, Read},
path::{Path, PathBuf},
};
use crate::filter;
#[derive(Debug)]
pub struct FileDiscovery<F> where F: filter::Filter {
filter: F,
recursive: bool,
current: ReadDir,
sub_dirs: Option<Vec<PathBuf>>,
}
impl<F> Iterator for FileDiscovery<F> where F: filter::Filter {
type Item = io::Result<PathBuf>;
fn next(&mut self) -> Option<Self::Item> {
loop {
match self.current.next() {
Some(entry) => match entry {
Ok(entry) => match entry.file_type() {
Ok(file_type) => {
let path = entry.path();
let is_symlink = file_type.is_symlink();
if file_type.is_dir() || (is_symlink && path.is_dir()) {
if self.recursive == false || is_symlink {
continue;
}
if self.filter.accept(&path) == false {
continue;
}
match self.sub_dirs.as_mut() {
Some(sub_dirs) => sub_dirs.push(path),
None => self.sub_dirs = Some(vec![path]),
};
} else if file_type.is_file() || (is_symlink && path.is_file()) {
if self.filter.accept(&path) == false {
continue;
}
return Some(Ok(path));
}
},
Err(err) => return Some(Err(err)),
},
Err(err) => return Some(Err(err)),
},
None => match self.sub_dirs.as_mut() {
None => return None,
Some(sub_dirs) => match sub_dirs.len() {
0 => return None,
_ => match fs::read_dir(sub_dirs.remove(0)) {
Ok(new) => self.current = new,
Err(err) => return Some(Err(err)),
},
},
},
};
}
}
}
pub fn find_files<P, F>(dir: P, recursive: bool, filter: F) -> io::Result<FileDiscovery<F>> where P: AsRef<Path>, F: filter::Filter {
Ok(FileDiscovery {
filter,
recursive,
current: fs::read_dir(dir)?,
sub_dirs: None,
})
}
pub fn read<R>(src: R, limit: Option<usize>) -> io::Result<Vec<u8>> where R: Read {
let mut reader = BufReader::new(src);
let mut result = vec![];
loop {
let len = {
let buf = reader.fill_buf()?;
if buf.is_empty() {
return Ok(result);
}
if let Some(limit) = limit {
match result.len().checked_add(buf.len()) {
Some(new_len) => if new_len > limit {
return Err(Error::new(ErrorKind::Other, "Data exceeds limit"));
},
None => return Err(Error::new(ErrorKind::Other, "Too much data to read")),
};
}
result.extend(buf);
buf.len()
};
reader.consume(len);
}
}
pub fn read_to_string<R>(src: R, limit: Option<usize>) -> io::Result<String> where R: Read {
String::from_utf8(read(src, limit)?).map_err(|e| Error::new(ErrorKind::InvalidInput, e))
}
pub fn read_file<P>(file: P, limit: Option<usize>) -> io::Result<Vec<u8>> where P: AsRef<Path> {
read(File::open(file)?, limit)
}
pub fn read_file_to_string<P>(file: P, limit: Option<usize>) -> io::Result<String> where P: AsRef<Path> {
read_to_string(File::open(file)?, limit)
}