#!/bin/sh

if [ "$1" = "" ]; then
  echo "Usage: prism3to4 <file> [<outfile>]"
  exit
fi

if [ "$2" = "" ]; then
  java -cp ~/prism-parser/classes parser.Prism3To4 "$1"
else
  if [ "$2" = "$1" ]; then
    ( java -cp ~/prism-parser/classes parser.Prism3To4 "$1" > "$2".new && mv "$2".new "$2" ) || rm "$2".new
  else
    java -cp ~/prism-parser/classes parser.Prism3To4 "$1" > "$2"
  fi
fi