#! /bin/sh

[ -n "$PROJROOT" ] || { echo "Require environment var PROJROOT" >&2; exit 1; }

echo " -> Checking Version" >&2
version_parts=$(grep -i version $PROJROOT/Changes | head -n 1 | sed -ne 's/Version *\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)[^0-9]*\([-0-9]*\)/\1 \2 \3 \4/p')
read major minor release date <<END
$version_parts
END
extra=''
if [ -z "$major" -o -z "$date" ]; then
	echo "Can't get version from ./Changes" >&2
	exit 1
fi
echo "    Changes version is $major.$minor.$release ($date)" >&2

if [ -d "$PROJROOT/.git" ]; then
	export GIT_DIR="$PROJROOT/.git"
	export GIT_WORK_TREE="$PROJROOT"
	head_hash=$(git log -n 1 --format=format:%h)
	tag_hash=$(git log -n 1 --format=format:%h v$major.$minor.$release -- 2>/dev/null)
	git_dirty=$(git status --porcelain | wc -l)
	if [ "$git_dirty" -gt 0 -o "$tag_hash" != "$head_hash" ]; then
		echo "    Git state differs from ./Changes" >&2
		extra="$head_hash"
		date="$(git log -n 1 --format=format:%ci | sed -e 's/ /T/;s/ //')"
		if [ "$git_dirty" -gt 0 ]; then
			extra="$extra+changes"
			date=`date "+%Y-%m-%dT%H:%M:%S"`;
		fi
	fi
fi

echo "    Version is $major $minor $release $extra $date" >&2;

[ -n "$extra" ] && suffix="-$extra" || suffix='';

echo " -> Regenerating Version.c" >&2
cat <<END
/* Generated by build-version.sh */

const int CGLVER_Major=$major;
const int CGLVER_Minor=$minor;
const int CGLVER_Release=$release;
const char* CGLVER_Extra="$extra";
const char* CGLVER_Date="$date";
const char* CGLVER_String="$major.$minor.$release$suffix";

END