Overcommit+Pronto+個別チェッカーで変なRubyコード（変更分＋新規分）をコミットさせない ref: https://qiita.com/vochicong/items/b63d573dbdc24dfe02ad

.overcommit.yml

PreCommit:
  CustomScript:
    enabled: true
    command: ['bin/precommit.sh']

file3.sh

overcommit --install

precommit-part1.sh

#!/usr/bin/env bash
set -x

# Pronto crashes on checking files not yet committed,
# therefore we reset them once and re-add later
newrubies=$(git diff --name-only --diff-filter=A HEAD |\
            grep -e '\.\(rb\|rake\)$' | tr '\n' ' ')
[ -z "${newrubies// }" ] && exit

git reset $newrubies
status=0
bin/pronto run --staged || let ++status
git add $newrubies

precommit-part2.sh

# Check those new files that not checked by Pronto
bin/flay `echo $newrubies`
bin/flog `echo $newrubies`
bin/reek -s `echo $newrubies` --failure-exit-code 0
bin/rubocop `echo $newrubies` || let ++status

exit $status