Funny script to replace git commit and change time of commit

alias-git-commit.sh

#!/bin/sh

COUNTER_FILE="${HOME}/bin/.counter_date"

get_counter() {
  # Read counter file
  if [ -f "${COUNTER_FILE}" ]; then
    # Check if file is same day that today
    COUNTER_FILE_DATE=$(date -r "${COUNTER_FILE}" +"%Y%m%d")
    CURRENT_FILE_DATE=$(date +"%Y%m%d")

    if [ "${COUNTER_FILE_DATE}" -eq "${CURRENT_FILE_DATE}" ]; then
      COUNTER=$(cat "${COUNTER_FILE}")

      COUNTER=$(expr ${COUNTER} + 1)
    else
      # Reinit counter file
      COUNTER=0
      rm -f "${COUNTER_FILE}"
    fi
  else
    COUNTER=0
  fi
}

# Check only if git commit
if [ "$1" = "commit" ]; then
  if [ -d '.git' ]; then
    GIT_LOCAL_CONFIG=$(git config --list --local)

    IS_GITHUB_REPOSITORY=$(echo ${GIT_LOCAL_CONFIG} | grep 'github')
    IS_EMAIL=$(echo ${GIT_LOCAL_CONFIG}| grep 'user.email')
    IS_USERNAME=$(echo ${GIT_LOCAL_CONFIG} | grep 'user.name')

    if [ -n "${IS_GITHUB_REPOSITORY}" ]; then
      if [ -n "${IS_EMAIL}" ] && [ -n "${IS_USERNAME}" ]; then
        get_counter

        # Take today, set hour to 19:00 and add minutes
        NEW_DATE=$(date -d "19:00 today + ${COUNTER} minutes" +'%Y-%m-%d %H:%M:%S')

        echo "** Change happy hour ! **"
        echo ">> ${NEW_DATE}"

        export GIT_COMMITTER_DATE="${NEW_DATE}"
        export GIT_AUTHOR_DATE="${NEW_DATE}"
      else
        echo "fatal: this is github repository without username and email set !" >&2

        exit 255
      fi
    fi
  else
    echo "fatal: not a git repository: .git" >&2

    exit 128
  fi
fi

git "$@"

RESULT=$?

unset GIT_COMMITTER_DATE
unset GIT_AUTHOR_DATE

# Counter set, save it only if git OK
if [ -n "${COUNTER}" ] && [ ${RESULT} -eq 0 ]; then
  echo "${COUNTER}" > "${COUNTER_FILE}"
fi

exit ${RESULT}