+#!/bin/sh
+
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2008 Jean Privat <jean@pryen.org>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This program is used to generate version number from git refs.
+# The version number is stored in a dedicated Nit module.
+
+gen_version() {
+cat > nit_version.nit<<END
+# This file was generated by git-gen-version.sh
+package nit_version
+meth nit_version: String do return "$*"
+END
+echo "Version $*"
+}
+
+# Are we in the nitc.nit directory?
+if [ ! -f nitc.nit ]; then
+ if [ -f src/nitc.nit ]; then
+ cd src
+ else
+ echo "Error: no nitc.nit found." >&2
+ exit 1
+ fi
+fi
+
+VN=$(git describe --tags --always HEAD)
+if [ -z "$VN" ]; then
+ VN="undefined"
+fi
+if [ -n "$1" ]; then
+ VN="${VN}_$1"
+fi
+if [ -n "$(git diff HEAD)" ]; then
+ VN="${VN}_dirty"
+fi
+
+gen_version "$VN"