Bump Git Tag - Shell Script

tag.sh

function tag() {
  VERSION=`git describe --abbrev=0 --tags`
  VERSION_BITS=("${(@s/./)VERSION}")
  MAJOR=$VERSION_BITS[1]
  MINOR=$VERSION_BITS[2]
  HF=$VERSION_BITS[3]


  if [ "$1" = "major" ];
  then
    MAJOR=$((MAJOR+1))
    MINOR='0'
    HF='0'
  elif [ "$1" = "minor" ];
  then
    MINOR=$((MINOR+1))
    HF='0'
  elif [ "$1" = "hotfix" ];
  then
    HF=$((HF+1))
  fi

  NEW_TAG="$MAJOR.$MINOR.$HF"

  echo "Want to bump tag from $VERSION to $NEW_TAG (y/n)"
  read yn
   case $yn in
       [Yy]* ) git tag $NEW_TAG;;
       [Nn]* ) return;;
       * ) echo "Please answer yes or no.";;
   esac

}