#!/usr/bin/env bash

 #

 # $Id$

 # Author: Markus Wenzel, TU Muenchen

 # License: GPL (GNU GENERAL PUBLIC LICENSE)

 #

 # MLWorks startup script (for 1.0r2 or later).

 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

 if [ -z "$INFILE" ]; then

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

   MLWORKS="mlworks-basis -tty"

 else

   EXIT=""

   MLWORKS="mlimage -load $INFILE -tty"

 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 () = (Shell.saveImage (\"$OUTFILE\", false); true);"

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

 RC="$?"

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

 exit "$RC"