#!/bin/sh

set -Ceu

# Print a version tag.
# - If VERSION is marked with +, then invoke hg to include
#   . number of commits since tag,
#   . commit id, and
#   . whether the tree is dirty.
# - If VERSION is not marked, report it verbatim without running hg.

main=`dirname -- "$0"`
version=`cat -- "$main"/VERSION`
case $version in
*+)
	version=${version%+}
	tag_dist=`hg log -r . --template '{latesttag}-{latesttagdistance}'`
	id_dirty=`hg id -i`
	case $tag_dist in
	v$version-0-*)	tag_dist=$version;;
	v$version-*)	tag_dist=${tag_dist#v}-m;;
	*)		echo >&2 "inconsistent version: $version, $full";;
	esac
	case $id_dirty in
	*+)		id_dirty=${id_dirty%+}-dirty;;
	esac
	echo ${tag_dist}${id_dirty}
	;;
*)
	echo $version
	;;
esac