#!/bin/bash
#
# $Id$
#
# Proof General interface wrapper for classic Isabelle.


## diagnostics

PRG=$(basename $0)

function usage()
{
  echo
  echo "Usage: $PRG [OPTIONS] [FILES ...]"
  echo
  echo "  Options are:"
  echo "    -l NAME      logic image name (default \$ISABELLE_LOGIC=$ISABELLE_LOGIC)"
  echo "    -p NAME      Emacs program name (default xemacs)"
  echo "    -u BOOL      use .emacs file (default true)"
  echo "    -w BOOL      use window system (default true)"
  echo
  echo "Starts Proof General for Isabelle/classic with proof documents FILES"
  echo "(default Scratch.thy)."
  echo
  echo "  PROOFGENERAL_OPTIONS=$PROOFGENERAL_OPTIONS"
  echo
  exit 1
}

function fail()
{
  echo "$1" >&2
  exit 2
}


## process command line

export PROOFGENERAL_HOME=$(cd $(dirname "$0"); cd ..; echo $PWD)


# options

LOGIC="$ISABELLE_LOGIC"
PROGNAME="xemacs"
INITFILE="true"
WINDOWSYSTEM="true"

function getoptions()
{
  OPTIND=1
  while getopts "l:p:u:w:" OPT
  do
    case "$OPT" in
      l)
        LOGIC="$OPTARG"
        ;;
      p)
        PROGNAME="$OPTARG"
        ;;
      u)
        INITFILE="$OPTARG"
        ;;
      w)
        WINDOWSYSTEM="$OPTARG"
        ;;
      \?)
        usage
        ;;
    esac
  done
}

getoptions $PROOFGENERAL_OPTIONS

getoptions "$@"
shift $(($OPTIND - 1))


# args

FILES="$@"
shift $#

[ -z "$FILES" ] && FILES="Scratch.thy"


## main

ARGS=""

[ "$INITFILE" = false ] && ARGS="$ARGS -q"

if [ "$WINDOWSYSTEM" = true -a -n "$DISPLAY" ]; then
  ARGS="$ARGS -T Isabelle"
else
  ARGS="$ARGS -nw"
fi


ARGS="$ARGS -l $PROOFGENERAL_HOME/isa/interface-setup.el"
ARGS="$ARGS -l $PROOFGENERAL_HOME/generic/proof-site.el"

for FILE in "$ISABELLE_HOME/etc/proofgeneral-settings.el" \
    "$ISABELLE_HOME_USER/etc/proofgeneral-settings.el"
do
  [ -f "$FILE" ] && ARGS="$ARGS -l $FILE"
done

export PROOFGENERAL_ASSISTANTS=isa
export PROOFGENERAL_LOGIC="$LOGIC"
exec $PROGNAME $ARGS $FILES