#!/bin/sh

set -e

H_FILE=$1
NEW_VERSION=$2

VERSION_H_NEEDS_UPDATE=1
if [ -z "$NEW_VERSION" ]; then
  NEW_VERSION=`git describe --tags --dirty | sed 's,^release-,,;s,-,+,;s,-,~,;'`
fi

if [ -n  "`echo -e $NEW_VERSION | grep  Format`" ]; then
  NEW_VERSION="unknown-version"
fi

# version.h exists => check if it containts the up-to-date version
if [ -f ${H_FILE} ]; then
  OLD_VERSION=`sed 's/.*"\(.*\)".*/\1/' < ${H_FILE}`
  if [ "${OLD_VERSION}" = "${NEW_VERSION}" ]; then
    VERSION_H_NEEDS_UPDATE=0
  fi
fi

if [ $VERSION_H_NEEDS_UPDATE -eq 1 ]; then
  echo "#define PACKAGE_VERSION \"${NEW_VERSION}\"" > ${H_FILE}
fi