Git pre-commit hook that runs ESLint

pre-commit

#!/bin/bash
TOPLEVEL=$(git rev-parse --show-toplevel)
ESLINT_CMD="${TOPLEVEL}/node_modules/.bin/eslint"

if [[ ! -x "$ESLINT_CMD" ]]; then
  echo "\t\033[41mPlease install ESlint\033[0m (npm i --save --save-exact --dev eslint)"
  exit 1
fi

STAGED_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep ".jsx\{0,1\}$")

if [[ "$STAGED_FILES" = "" ]]; then
  exit 0
fi

echo "ESLint'ing ${#STAGED_FILES[@]} files"

$ESLINT_CMD "${STAGED_FILES[@]}"

ESLINT_EXIT="$?"

if [[ "${ESLINT_EXIT}" == 0 ]]; then
  printf "\n\033[42m\e[90mCOMMIT SUCCEEDED\033[0m\n"
else
  git reset HEAD ${STAGED_FILES}
  printf "\n\033[41m\e[90mCOMMIT FAILED\033[0m Fix ESLint errors and try again\n"
  exit 1
fi

exit $?