tempfile-fast 0.3.6

Support for Linux-specific tempfile extensions
Documentation 
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extern crate tempfile;
extern crate tempfile_fast;

use std::fs;
use std::io::Read;
use std::io::Seek;
use std::io::SeekFrom;
use std::io::Write;

use tempfile_fast::PersistError;
use tempfile_fast::PersistableTempFile;

#[test]
fn empty_on_linux() {
    let temp_dir = tempfile::Builder::default()
        .prefix("tempfile-deleted")
        .tempdir()
        .unwrap();
    let tmp = PersistableTempFile::new_in(&temp_dir).unwrap();

    // Will only actually be deleted on (modern) linux:
    #[cfg(target_os = "linux")]
    {
        assert_eq!(0, fs::read_dir(&temp_dir).unwrap().count());
    }

    let dest = temp_dir.path().to_path_buf().join("foo");

    tmp.persist_noclobber(&dest).unwrap();
    assert!(dest.exists());
}

#[test]
fn overwrite() {
    let temp_dir = tempfile::Builder::default()
        .prefix("tempfile-deleted")
        .tempdir()
        .unwrap();
    let root = temp_dir.path();
    let mut sub = root.to_path_buf();
    sub.push("sub");
    fs::create_dir(&sub).unwrap();

    let mut dest = sub.to_path_buf();
    dest.push("dest");
    {
        fs::File::create(&dest).unwrap();
    }

    let tmp = PersistableTempFile::new_in(&sub).unwrap();
    let mut tmp = match tmp.persist_noclobber(&dest) {
        Ok(()) => unreachable!(),
        Err(e) => {
            let e_checked: PersistError = e;
            e_checked.file
        }
    };

    tmp.write_all(b"yello").unwrap();

    assert!(tmp.persist_by_rename(&dest).is_ok());

    {
        let mut s = String::new();
        fs::File::open(&dest)
            .unwrap()
            .read_to_string(&mut s)
            .unwrap();
        assert_eq!(s, "yello");
    }

    assert_eq!(1, fs::read_dir(sub).unwrap().count());
    assert_eq!(
        1,
        fs::read_dir(root).unwrap().count(),
        "didn't create anything in the parent directory, either"
    );
}

fn write_hi<W: Write>(mut thing: W) -> W {
    thing.write_all(b"hi").unwrap();
    thing
}

fn read<R: Read>(mut thing: R) -> String {
    let mut s = String::new();
    thing.read_to_string(&mut s).unwrap();
    s
}

#[test]
fn read_write() {
    let temp_dir = tempfile::Builder::default()
        .prefix("tempfile-deleted")
        .tempdir()
        .unwrap();
    let mut tmp = PersistableTempFile::new_in(temp_dir.path()).unwrap();
    write_hi(&mut tmp);
    let mut tmp = write_hi(tmp);

    assert_eq!(1, tmp.seek(SeekFrom::Current(-3)).unwrap());

    assert_eq!("ihi", read(&mut tmp));

    assert_eq!(0, tmp.seek(SeekFrom::Start(0)).unwrap());
    assert_eq!("hihi", read(tmp));
}