Simple GIT pre-commit hook for linting

pre-commit

#!/usr/bin/env bash

echo "> Running pre-commit script"

PWD=$(pwd)
BIN_PRETTIER="$PWD/node_modules/prettier/bin-prettier.js"

mapfile files < <(git diff-index --diff-filter=d --cached --name-only HEAD)
files_c=${#files[@]}

for (( i=0; i<files_c; i++ ));
do
  file=${files[$i]}
  file=${file%$'\n'}

  out=$file
  # lint JavaScript & TypeScript files with Prettier
  if [[ "$PWD/$file" =~ \.(js|jsx|ts|tsx)$ ]];
  then
    if [[ ! $(node -v) ]]; then
      echo "Node does not exist"
      continue
    fi
    if [[ ! -f "$BIN_PRETTIER" ]];
    then
      echo "Prettier does not exist"
      continue
    fi

    out="$(node "$BIN_PRETTIER" "$PWD/$file" --write)"
    out="${out//\\//}"
  fi

  printf "\r> %d/%d %s \033[K" "$((i + 1))" "$files_c" "$out"

  git add "$PWD/$file"
done

printf "\r\u221A Done \033[K"

exit 0