コミット前にrubocop適用して自動修正するフック

pre-commit

#!/usr/bin/env ruby

files = `git diff --cached --name-only | grep .rb`.split
exit 0 if files.empty?

ok = true
files.each do |file|
  next unless File.exist?(file)
  result = system "rubocop", "--auto-correct", file
  ok = false if result == false
end

exit(ok ? 0 : 1)