#!/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 = 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

MLTEXT="$EXIT $COMMIT $MLTEXT"

MLEXIT="commit();"

## run it!

START_SML="$INFILE $ML_OPTIONS"

if [ -n "$TERMINATE" ]; then

  echo "$MLTEXT" "$MLEXIT" | $START_SML

  RC=$?

elif [ -z "$MLTEXT" ]; then

  sh -c "{ $ISABELLE_HOME/lib/scripts/ucat; echo '$MLEXIT'; } | $START_SML"

  RC=$?

else

  sh -c "{ echo '$MLTEXT'; $ISABELLE_HOME/lib/scripts/ucat; echo '$MLEXIT'; } | $START_SML"

  RC=$?

fi

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

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

  rm -f "$INFILE" || fail_out

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

fi

exit $RC