#!/usr/bin/env bash

#

# $Id$

# Author: Markus Wenzel, TU Muenchen

# License: GPL (GNU GENERAL PUBLIC LICENSE)

#

# Moscow ML 2.00 startup script

export -n INFILE OUTFILE COPYDB COMPRESS MLTEXT TERMINATE NOWRITE

## diagnostics

function fail_out()

{

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

  exit 2

}

## prepare databases

MOSML="mosml -P sml90"

if [ -z "$INFILE" ]; then

  EXIT='load "OS"; fun exit 0 = (OS.Process.exit OS.Process.success): unit | exit _ = OS.Process.exit OS.Process.failure;'

else

  EXIT=""

  echo "Cannot load images yet!" >&2

  exit 2

fi

if [ -z "$OUTFILE" ]; then

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

else

  COMMIT="fun commit () = true;"

  echo "WARNING: cannot save images yet!" >&2

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

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; "$ML_HOME"/$MOSML $ML_OPTIONS 2>&1; RC="$?"; kill -HUP "$FPID"; exit "$RC"; }

RC="$?"

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

exit "$RC"