#!/bin/bash

#

# $Id$

#

# SML/NJ startup script (for 0.93).

#

# Global vars: INFILE OUTFILE MLTEXT TERMINATE NOWRITE ISABELLE_TMP,

# and from settings

## diagnostics

function fail_out()

{

  echo "Unable to create output heap file: \"$OUTFILE\"" >&2

  exit 2

}

## prepare databases

if [ -z "$INFILE" ]; then

  INFILE="$ML_HOME/sml"

  EXIT="val exit: int -> unit = System.Unsafe.CInterface.exit;"

else

  EXIT=""

fi

MOVE=""

if [ -z "$OUTFILE" ]; then

  COMMIT='fun commit () = (output (std_err, "Error - Database is not opened for writing.\n"); false);'

else

  if [ "$INFILE" -ef "$OUTFILE" ]; then

    OUTDIR=$(dirname "$OUTFILE")/tmp

    OUTFILE=$OUTDIR/$(basename "$OUTFILE")

    mkdir -p "$OUTDIR" || fail_out

    MOVE=true

  fi

  [ -f "$OUTFILE" ] && { chmod +w "$OUTFILE" || fail_out; }

  COMMIT="fun commit () = not (exportML\"$OUTFILE\");"

fi

## run it!

MLTEXT="$EXIT $COMMIT $MLTEXT"

MLEXIT="commit();"

if [ -z "$TERMINATE" ]; then

  FEEDER_OPTS=""

else

  FEEDER_OPTS="-q"

fi

$ISABELLE_HOME/lib/scripts/feeder -p -h "$MLTEXT" -t "$MLEXIT" $FEEDER_OPTS | \

  { read FPID; $INFILE $ML_OPTIONS; RC=$?; kill -HUP $FPID; exit $RC; }

RC=$?

## fix heap file

[ -n "$OUTFILE" -a -f "$OUTFILE" -a -n "$NOWRITE" ] && chmod -w "$OUTFILE"

if [ -n "$MOVE" -a -f "$OUTFILE" ]; then

  rm -f "$INFILE" || fail_out

  mv "$OUTFILE" "$INFILE" || fail_out

fi

exit $RC