Implement file cache

[ChrisBr]

First approach to implement a file cache.

• Implement functionality to prune cache
• Add error message when using --with-cache and `--autocorrect`` options together
• Implement specs

#158

Co-authored-by: Mike Dalessio mike.dalessio@gmail.com

[zachfeldman]

@ChrisBr @flavorjones hi 👋 ! I was thinking of picking this work back up and trying to get something merged around this again. It would really help lower the time of our linting step locally!

Were there any particular road blocks around getting this solution merged? I tried running it locally and it seemed to skip files on cache hits, so I suppose that's half the battle. Just wondering if ya'll remember hitting some insurmountable challenge trying to write this PR or other priorities took over.

[ChrisBr]

@zachfeldman no particular roadblocks just some work left todo

• Implement functionality to prune cache
• Add error message when using --with-cache and --autocorrect options together
• Implement specs

Feel free to pick this up and finish it.

[zachfeldman]

Got started today with a pruning commit that seems to work with my experiments:
7496dbb

will continue and try to get the rest of the checklist! I think I'll also add a clear command in addition to clean (which I should just rename prune).

[zachfeldman]

@ChrisBr @flavorjones opened up a PR with the requirements and a bit more along with specs:
#268

definitely appreciate any feedback on it!