#!/bin/bash

#

# $Id$

# Author: Markus Wenzel, TU Muenchen

# License: GPL (GNU GENERAL PUBLIC LICENSE)

#

# SML/NJ startup script (for 0.93).

export -n INFILE OUTFILE COMPRESS MLTEXT TERMINATE NOWRITE

## diagnostics

function fail_out()

{

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

  exit 2

}

function check_mlhome_file()

{

  if [ ! -f "$1" ]; then

    echo "Unable to locate $1" >&2

    echo "Please check your ML_HOME setting!" >&2

    exit 2

  fi

}

## prepare databases

if [ -z "$INFILE" ]; then

  INFILE="$ML_HOME/sml"

  check_mlhome_file "$INFILE"

  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"