#!/bin/sh
#
# $Id: dimacs2hol,v 1.3 2005/04/26 17:50:57 wenzelm Exp $
# Author: Tjark Weber
# Copyright 2004
#
# DESCRIPTION: convert DIMACS CNF files into Isabelle/HOL theories


## diagnostics

PRG="$(basename "$0")"

usage()
{
  echo
  echo "Usage: $PRG FILES"
  echo
  echo "  Convert files in DIMACS CNF format [1] into Isabelle/HOL theories."
  echo
  echo "  For each CNF file, a theory file (with '.thy' appended to the original"
  echo "  filename) is generated.  The CNF files are not modified."
  echo
  echo "  This script is not too strict about the format of the input file.  However,"
  echo "  in rare cases it may produce a theory that will not be accepted by"
  echo "  Isabelle/HOL (e.g. when a CNF file contains '\\end{verbatim}' or '*}' in a"
  echo "  comment)."
  echo
  echo "  Each CNF file must contain at least one clause, and may not contain empty"
  echo "  clauses (i.e. '0' immediately followed by another '0')."
  echo
  echo "  The CNF formula is negated, so that an unsatisfiable formula becomes"
  echo "  provable."
  echo
  echo "  [1] ftp://dimacs.rutgers.edu/pub/challenge/satisfiability/doc/satformat.dvi"
  echo
  exit 1
}


## process command line

[ "$#" -eq 0 -o "$1" = "-?" ] && usage


## main

#set by configure
AUTO_PERL=perl

"$AUTO_PERL" -w "$ISABELLE_HOME/lib/scripts/dimacs2hol.pl" "$@"