Run Rubocop on files that've changed in Git

copchanged.sh

#!/bin/bash

rubocop $(git diff --name-only --diff-filter=d main...) --force-exclusion "$@"

--porcelain creates a future proof short list of changed files, sed then cuts out the first three characters of each line to ensure we don't have the actual status of each file. This leaves a nice set of changed files to pass into rubocop.

--force-exclusion means that even if the list of files includes files that are listed as excluded in your rubocop config file you won't get output for those files.

We then use "$@" to pass through all other parameters. This allows you to use this as your base rubocop command with modifiers if you want.

I should consider using something like git diff --name-only --diff-filter=d develop... to diff off of develop for this. So that I can see issues with my whole branch rather than just the current staging area.

Would be good if it was off of the parent branch rather than just develop however.

I've updated this to use the contents of files-diff for gathering the changed files. Typically I have that as a separate script that I use instead:

#!/bin/bash

rubocop $(files-diff) --force-exclusion "$@"