#!/usr/bin/env bash

 #

 # Author: Markus Wenzel, TU Muenchen

 #

 # Poly/ML 4.x 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

 }

 function check_file()

 {

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

     echo "Unable to locate $1" >&2

     echo "Please check your ML system settings!" >&2

     exit 2

   fi

 }

 ## Poly/ML executable and database

 ML_DBASE_PREFIX=""

 POLY="$ML_HOME/poly"

 check_file "$POLY"

 if [ -z "$ML_DBASE" ]; then

   if [ ! -e "$ML_HOME/ML_dbase" -a "$(basename "$ML_HOME")" = bin ]; then

     ML_DBASE_HOME="$(cd "$ML_HOME"; cd "$(pwd -P)"; cd ../lib/poly; pwd)"

   else

     ML_DBASE_HOME="$ML_HOME"

   fi

   if [ -z "$COPYDB" ]; then

     ML_DBASE_PREFIX="$ML_DBASE_HOME/"

     ML_DBASE="ML_dbase"

   else

     ML_DBASE="$ML_DBASE_HOME/ML_dbase"

   fi

   export POLYPATH="$ML_DBASE_HOME"

 else

   export POLYPATH="$(dirname "$ML_DBASE")"

 fi

 DISCGARB_OPTIONS="-d -c"

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

 ## prepare databases

 if [ -z "$INFILE" ]; then

   check_file "$ML_DBASE_PREFIX$ML_DBASE"

   INFILE="$ML_DBASE"

   MLTEXT="val use = PolyML.use; $EXIT $MLTEXT"

   DISCGARB_OPTIONS="$DISCGARB_OPTIONS -S max"

 else

   COPYDB=true

 fi

 if [ -z "$OUTFILE" ]; then

   DB="$INFILE"

   ML_OPTIONS="-r $ML_OPTIONS"

 elif [ "$INFILE" -ef "$OUTFILE" ]; then

   DB="$INFILE"

 elif [ -n "$COPYDB" ]; then

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

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

   chmod +w "$OUTFILE" || fail_out

   DB="$OUTFILE"

 else

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

   echo "PolyML.make_database \"$OUTFILE\"; PolyML.quit();" | "$POLY" -r "$INFILE"

   [ -f "$OUTFILE" ] || fail_out

   DB="$OUTFILE"

 fi

 ## run it!

 if [ -z "$TERMINATE" ]; then

   FEEDER_OPTS=""

 else

   FEEDER_OPTS="-q"

 fi

 DB_INFO="$(ls -l "$DB" 2>/dev/null)"

 "$ISABELLE_HOME/lib/scripts/feeder" -p -h "$MLTEXT" $FEEDER_OPTS | {

   read FPID; "$POLY" $ML_OPTIONS "$DB";

   RC="$?"; kill -HUP "$FPID"; exit "$RC"; }

 RC="$?"

 NEW_DB_INFO="$(ls -l "$DB" 2>/dev/null)"

 [ -n "$OUTFILE" -a -n "$COMPRESS" -a "$DB_INFO" != "$NEW_DB_INFO" ] && \

   "$POLY" $DISCGARB_OPTIONS "$OUTFILE"

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

 exit "$RC"