decompression

Do you plan on generating declaration files for supporting Typescript?
You could either have them as part of the repo or contribute to https://github.com/DefinitelyTyped/DefinitelyTyped/

Thanks in advance!

I've forked a small modification to SevenZipFile.writeall and SevenZipFile._writeall so as to enable flattening the zip and picking specific files (eg through glob). It could probably do with some refinement.
@miurahr, penny for your thoughts?

Instead of panicking like this:

# src/ is a folder
$ cargo run -q -- c src src.xz
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src/commands.rs:70:85
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Should give a helpful error message, saying that its impossible to compress a folder with .xz.

Same applies for .gz,