#!/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=$(try_tag); then
	fmt=%Y%m%d
	if git diff-index --quiet HEAD --; then
		latest="$(git rev-list -1 --date=format:${fmt} --pretty=%ad --no-commit-header HEAD)"
		modified=0
	else
		latest="$(date +${fmt})"
		modified=1
	fi
	count=$(git rev-list --date=format:${fmt} --pretty=%ad --no-commit-header HEAD | sed -n /${latest}/p | wc -l)
	count=$(( ${count} + ${modified} ))
	version="${latest}.${count}"
fi
echo "${version}"