#!/bin/sh
bison243 -d -t -o grammar.cc grammar.y
if [ -f grammar.hh ]
then
  mv grammar.hh grammar.cc.h
fi
if [ -f grammar.h ]
then
  if diff -w grammar.cc.h grammar.h >/dev/null
  then
    echo grammar.h was okay
    command rm grammar.cc.h
  else
    echo generating new grammar.h
    mv grammar.cc.h grammar.h
  fi
else
  echo generating grammar.h
  mv grammar.cc.h grammar.h
fi