1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
use std::io;
use walkdir;
use walkdir::WalkDir;
use std::fs::File;
use std::io::prelude::*;
use seahash::hash as hashvec;


fn noice_err(e: walkdir::Error) -> io::Error {
    match e.into_io_error() {
        Some(e) => e,
        None => io::Error::new(io::ErrorKind::Other, "Unknown Error"),
    }
}

pub fn hash<P: AsRef<std::path::Path>>(dir: P) -> Result<u64, io::Error> {
    let mut buffer: Vec<u8> = vec![];
    let mut hashes: Vec<u64> = vec![];
    for entry in WalkDir::new(dir).into_iter() {
        let entry = entry.map_err(noice_err)?.into_path();
        if entry.is_file(){
            File::open(entry)?.read_to_end(&mut buffer)?;
            hashes.push(hashvec(&buffer));
        }    
    }
    let mut final_hash: Vec<u8> = vec![];
    hashes.sort_unstable();
    for elem in hashes{
        //TODO: Don't
        //TODON'T: keep
        let bys: [u8; 8] = unsafe{std::mem::transmute::<u64, [u8;8]>(elem)};
        final_hash.extend(&bys)
    }

    
    Ok(hashvec(&final_hash))
}

#[cfg(test)]
mod tests {
    use super::*;
    #[test]
    fn it_works() {
        assert_eq!(2 + 2, 4);
    }
}