Add unescape_ascii fn

[leighmcculloch]

The bstr crate has an escape_ascii function on Bstr which is really helpful for producing a string version of a Bstr that can be printed, or placed in places that only ascii can be used.

It'd be helpful if there was an unescape_ascii function for producing a [u8]/Bstr from the escaped string produced by escape_ascii.

Then it would be possible to round-trip Bstr into places only ascii strings can be passed.

[BurntSushi]

Can you link to the escape_ascii method that's in this crate that you're talking about?

[leighmcculloch]

https://docs.rs/bstr/latest/bstr/struct.BStr.html#method.escape_ascii

Although I realize now that is coming from the core lib. 😳

[BurntSushi]

Correct. It's not a method in this library. This library does have escape_bytes and unescape_bytes, though it doesn't limit itself to ASCII.

Otherwise your use case sounds more like something that is a bit niche and might be deserving of something bespoke on your end.

[leighmcculloch]

As it turns out escape_bytes is exactly what I was looking for. Thanks. And thanks for making this crate ♥️.