#!/bin/bash

#

# $Id$

#

# SML/NJ startup script (for 1.06 or later).

#

# Global vars: INFILE OUTFILE COPYDB MLTEXT OPTIONS TERMINATE,

# and from settings

## diagnostics

function fail()

{

  echo "$1"

  exit 2

}

## locations and settings

SML="$ML_HOME/bin/sml"

## prepare databases

function fail_out()

{

  fail "Unable to create output heap file: \"$OUTFILE\""

}

if [ -z "$OUTFILE" ]; then

  DB="$INFILE"

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

elif [ -n "$INFILE" -a "$INFILE" != "$OUTFILE" ]; then           # FIXME ! -ef !?

  [ -f "$OUTFILE" ] && { rm -f "$OUTFILE" || fail_out }

  cp "$INFILE" "$OUTFILE" || fail_out

  chmod +w "$OUTFILE"

  DB="$INFILE"

  COMMIT="fun commit() = (exportML\"$OUTFILE\"; ());"

else

  DB="$INFILE"

  COMMIT="fun commit() = (exportML\"$OUTFILE\"; ());"

fi

[ -n "$DB" ] && DB="@SMLload=$DB"

MLTEXT="$COMMIT $MLTEXT"

## run it!

START_SML="$SML $ML_OPTIONS $OPTIONS $DB"

if [ -n "$TERMINATE" ]; then

  echo "$MLTEXT" | $START_SML

  RC=$?

elif [ -z "$MLTEXT" ]; then

  $START_SML

  RC=$?

else

  TMP_FILE=/tmp/mltext-$$

  echo "$MLTEXT" >$TMP_FILE

  $ISABELLE_HOME/lib/scripts/ucat $TMP_FILE - | $START_SML

  RC=$?

  rm $TMP_FILE

fi

exit $RC