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//! Print the SHA256 sum of each regular file in the current directory recursively.
use std::{fs::File, path::PathBuf};
use parseq::ParallelIterator;
use sha2::{Digest, Sha256};
use walkdir::WalkDir;
fn main() {
WalkDir::new(".")
.sort_by_file_name()
.into_iter()
.filter_map(|entry| match entry {
Ok(entry) if entry.file_type().is_file() => Some(Ok(entry.into_path())),
Ok(_) => None,
Err(err) => Some(Err(Error::WalkdirError(err))),
})
.map_parallel(|item| {
item.and_then(|path| {
let mut file =
File::open(&path).map_err(|err| Error::IoError(path.clone(), err))?;
let mut hasher = Sha256::new();
std::io::copy(&mut file, &mut hasher)
.map_err(|err| Error::IoError(path.clone(), err))?;
Ok((path, hasher.finalize()))
})
})
.for_each(|item| match item {
Ok((path, hash)) => println!("{:x} {}", hash, path.display()),
Err(err) => eprintln!("{err}"),
});
}
#[derive(Debug)]
enum Error {
WalkdirError(walkdir::Error),
IoError(PathBuf, std::io::Error),
}
impl std::error::Error for Error {}
impl std::fmt::Display for Error {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Error::WalkdirError(err) => {
if let Some(path) = err.path() {
write!(f, "{}: {}", path.display(), err)
} else {
write!(f, "{err}")
}
}
Error::IoError(path, err) => write!(f, "{}: {}", path.display(), err),
}
}
}
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