#!/bin/sh

BUILD_NUMBER=0
BUILD_FILE=build_number

if test "$1" = "--"; then
  num="$2"
  if test ! -z "${num##*[!0-9]*}"; then
    echo $2 > $BUILD_FILE
  else
    rm   $BUILD_FILE
  fi
#  echo $BUILD_NUMBER
#  exit
fi

if test -e $BUILD_FILE; then   # file exist
  BN=$(cat $BUILD_FILE)
  if test -n "$BN"; then       # file has content
    BUILD_NUMBER="$BN"
  fi
fi

echo $((BUILD_NUMBER + 1)) > $BUILD_FILE

echo $BUILD_NUMBER