But you told me you'd never forget!

pre-commit

#!/usr/bin/env ruby

status = `git status -s`
ignore = ["db/schema.rb"]
check = status.split("\n")
              .select { |line| ["A", "M"].include?(line[0..1].strip) }
              .select { |line| line[-3..-1] == ".rb" }
              .map { |line| line[3..-1] }
check -= ignore

ok = system("rubocop -R #{check.join(' ')}")
exit(ok)

Just because bash nerd

git status --porcelain | cut -c4- | grep .rb | xargs bundle exec rubocop -a