#!/bin/sh
# TODO: Think of a way to generate version without git repository for source tarballs. Making the script overwrite
#       itself with a static version sounds good enough, really.
try_tag() {
	local tag
	if tag=$(git describe --exact-match --tags --dirty=-dirty 2>/dev/null); then
		case "${tag}" in
			*-dirty) return 1;;
			*) echo "${tag}"; return 0;;
		esac
	fi
	return 1
}


if ! version=$(try_tag); then
	fmt=%Y%m%d
	set -- $(git rev-list --date=format:${fmt} --pretty=%ad --no-commit-header --since=yesterday HEAD)
	if [ $# -gt 0 ]; then
		suffix=$#
		git diff-index --quiet HEAD -- || suffix=$(( $# + 1 ))
		version="$1.${suffix}"
	else
		version="$(date +${fmt}).1"
	fi
fi
echo "${version}"