#!/usr/bin/env bash

 #

 # Author: Makarius

 #

 # Poly/ML 5.1/5.2 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

 }

 ## compiler executables and libraries

 POLY="$ML_HOME/poly"

 check_file "$POLY"

 if [ "$(basename "$ML_HOME")" = bin ]; then

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

 else

   POLYLIB="$ML_HOME"

 fi

 export LD_LIBRARY_PATH="$POLYLIB:$LD_LIBRARY_PATH"

 export DYLD_LIBRARY_PATH="$POLYLIB:$DYLD_LIBRARY_PATH"

 ## prepare databases

 if [ -z "$INFILE" ]; then

   INIT=""

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

 else

   check_file "$INFILE"

   INIT="(Signal.signal (2, Signal.SIG_HANDLE (fn _ => Process.interruptConsoleProcesses ())); PolyML.SaveState.loadState \"$INFILE\" handle Fail msg => (TextIO.output (TextIO.stdErr, msg ^ \"\\n\"); OS.Process.exit OS.Process.failure));"

   EXIT=""

 fi

 if [ -z "$OUTFILE" ]; then

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

 else

   if [ -z "$COMPRESS" ]; then

     COMMIT="fun commit () = (TextIO.output (TextIO.stdOut, \"Exporting $OUTFILE\n\"); PolyML.SaveState.saveState \"$OUTFILE\"; true);"

   else

     COMMIT="fun commit () = (PolyML.shareCommonData PolyML.rootFunction; TextIO.output (TextIO.stdOut, \"Exporting $OUTFILE\n\"); PolyML.SaveState.saveState \"$OUTFILE\"; true);"

   fi

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

 fi

 ## run it!

 MLTEXT="$INIT $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; "$POLY" -q $ML_OPTIONS; RC="$?"; kill -HUP "$FPID"; exit "$RC"; }

 RC="$?"

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

 exit "$RC"