From the maintainer Li Haoyi: I'm putting a 500USD bounty on this issue, payable by bank transfer on a merged PR implementing this.

Success criteria is a design and implementation of zip file handling in OS-Lib: zipping, unzipping, listing-without-unzipping, usage as a filesystem so you can generate os.Paths to read and write inside the zip without unzipping, etc. Along with tests exercising the logic, updated documentation, and documented limitations (e.g. not all filesystem operations can take place inside a zip file). This is to be done in the OS-Lib style, with default parameters, nested objects with apply methods as necessary, and exception-based error handling.

I'm loving all the filesystem handling stuff, particularly walking the file system, but it all falls down when I hit a zip file (actually a jar in this case, but whatevs). The only remotely friendly way I've found to deal with zip files in scala is better-files. At the moment I've just pulled in the dep for handling the jars, but it'd be awesome to have support for zip files baked into os-lib, particularly the ability to walk into jars and copy files to jars as easily as os-lib makes these operations on regular files/folders.