#!/usr/bin/env bash

VERSION_PREFIX="v"

# shellcheck disable=SC1083
BUILD_NUMBER=$(git rev-list --count --all)
BRANCH_NAME=$(git branch --show-current)
COMMIT=$(git rev-parse HEAD)
VERSION=$(git tag | sort | grep "${VERSION_PREFIX}" | tail -n 1 | cut -c$((${#VERSION_PREFIX} + 1))-)

if [ "${VERSION}" == "" ]; then
    VERSION="0.1.0-dev"
fi

function show_help() {
    echo "$0 [param]"
    echo ""
    echo "Parameters:"
    echo ""
    echo "  branch          Show branch."
    echo "  build_number    Show build number (commits count)."
    echo "  commit          Show commit hash."
    echo "  version         Show version (real or '0.1.0-dev' if no version tags present)."
}

case $1 in
branch)
    echo "${BRANCH_NAME}"
    ;;
build_number)
    echo "${BUILD_NUMBER}"
    ;;
commit)
    echo "${COMMIT}"
    ;;
version)
    echo "${VERSION}"
    ;;
*)
    show_help
    ;;
esac