A script to chain Heroku commands for deploying Django projects

heroku.sh

STAGINGAPP=staging-app-name
PRODUCTIONAPP=production-app-name

case "$1" in
  staging)
    APPNAME=$STAGINGAPP
    ;;
  production)
    APPNAME=$PRODUCTIONAPP
    ;;
  promote)
    heroku pipeline:diff --app=$STAGINGAPP
    read -p "Is this ready to promote to production? (y/n) " CONFIRM

    case "$CONFIRM" in
      y)
        ;;
      Y)
        ;;
      *)
        echo "Not promoting to production"
        exit
        ;;
    esac

    printf "Promoting to production...\n"
    heroku pipeline:promote --app=$STAGINGAPP
    heroku run python myapp/manage.py migrate --app=$PRODUCTIONAPP
    exit
    ;;
  *)
    usage
    exit
    ;;
esac

case "$2" in
  deploy)
    git push heroku-$APPNAME master
    heroku run python myapp/manage.py migrate --app=$PRODUCTIONAPP
    exit
    ;;
  dj)
    heroku run python myapp/manage.py "${@:3}" --app=$APPNAME
    exit
    ;;
esac

printf "\nExecuting in the $1 environment\n"
printf "heroku ${@:2} --app=$APPNAME\n\n"

heroku "${@:2}" --app="$APPNAME"