Our CI server is setup to run rubocop (ruby linter) after every checkin. On my local development machine I prefer to lint files that have recently changed and not the entire code base.

Add this code to a shell script and it will lint all files that have been staged. Note it uses the autofix rubocop option, optionally you could run it on non-staged files without the autofix flag.

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git diff --name-only --cached | grep '\.rb' | xargs rubocop -a

Don’t forget to git add . after rubocop finds/fixes any code style violations in your staged files.