git-_tag

#!/bin/bash
# Vinicius Knob


USAGE=$(cat << EOF
Usage: ${0##*/} [OPTIONS...]

Extension for git tag.

Available options are
    -h, --help           shows help
    -o, --obliterate     deletes tag from local and remote
    -p, --prune          removes all local tags and fetch the actives
    -r, --replace        replaces the hash of a local and remote tag
EOF
)


die() {
    printf '%s\n' "$1" >&2
    exit 1
}


tag_name=0
commit=0


while :; do
    case $1 in
        -h|-\?|--help)
            echo "$USAGE"
            exit
            ;;
        -o|--obliterate)
            if [ "$2" ]; then
                tag_name="$2"
            else
                die 'ERROR: "--obliterate" requires a non-empty option argument'
            fi
            option="obliterate"
            shift
            ;;
        -p|--prune)
            option="prune"
            shift
            ;;
        -r|--replace)
            if [ "$2" ]; then
                tag_name="$2"
            else
                die 'ERROR: "--replace" requires a non-empty option argument'
            fi
            if [ "$3" ]; then
                commit="$3"
            else
                commit="HEAD"
            fi
            option="replace"
            shift
            ;;
        --)              # End of all options.
            shift
            break
            ;;
        -?*)
            printf 'WARN: unknown option (ignored): %s\n' "$1" >&2
            ;;
        *)               # Default case: No more options, so break out of the loop.
            break
    esac
    shift
done


# https://git-scm.com/book/en/v2/Git-Basics-Tagging
if [ "$option" == "obliterate" ]
then
    printf '\nRemoving remote...\n'
    git push origin --delete "$tag_name"

    printf '\nRemoving local...\n'
    git tag --delete "$tag_name"
fi


# https://stackoverflow.com/questions/1841341/remove-local-git-tags-that-are-no-longer-on-the-remote-repository
if [ "$option" == "prune" ]
then
    printf '\nRemoving local tags...\n'
    git tag --list | xargs git tag --delete

    printf '\nFetching active tags...\n'
    git fetch --tags
fi


# https://stackoverflow.com/questions/8044583/how-can-i-move-a-tag-on-a-git-branch-to-a-different-commit
if [ "$option" == "replace" ]
then
    printf '\nReplacing existing tag...\n'
    git tag --force --annotate "$tag_name" "$commit"

    printf '\nPushing modification...\n'
    git push --force origin "$tag_name"
fi