#!/bin/sh
#
# dgibson.sh - run the dgibson entry
#
# usage:
#	dgibson.sh [data_file]

# parse args
#
if [ $# -eq 0 ]; then
    DATA="./dgibson.data1"
else
    DATA="$1"
fi
if [ ! -f "$DATA" ]; then
    echo "$0: no data found in $DATA" 1>&2
    exit 1
fi

# for the initial data.name if needed
#
if [ ! -f "data.name" ]; then
    rm -f data.name
    echo "$DATA" > data.name
fi
if [ ! -f life.d ]; then
    # force a new life setup
    echo "/" > data.name
fi
rm -f data.name2
echo "$DATA" > data.name2

# note if we are running a new form
#
if cmp -s data.name data.name2; then
    :
else
    rm -f life.d
    cp "$DATA" life.d
    rm -f data.name
    echo "$DATA" > data.name
    cat life.d
fi

# build a new copy of the program
#
rm -f dgibson
make dgibson

# form the next generation
#
chmod +w life.d
dgibson | tee life.d