#!/bin/sh

#
# %CopyrightBegin%
#
# Copyright Ericsson AB 2017. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# %CopyrightEnd%
#

#
# Usage:
#   fixpoint <output files> -- <command>
#
#   This script repeatedly runs <command> until all <output files>
#   stops changing between runs. This of course does not work well
#   with any arbitrary command :-)
#

files=

while [ $# -gt 0 ]; do
    if [ "$1" = "--" ]; then
	shift
	cmd=${1+"$@"}
	break;
    fi
    files="$files $1"
    shift
done

if [ "$cmd" = "" ]; then
    echo "$prog: Missing command" 1>&2
    exit 1
fi

changed=true

echo $files

while [ $changed = true ]; do
    echo $cmd
    eval $cmd 1>/dev/null 2>/dev/null
    changed=false
    for f in $files; do
	if [ -e "$f" ]; then
	    if [ -e "$f.prev" ]; then
		diff "$f" "$f.prev" 1>/dev/null 2>/dev/null || changed=true
	    else
		changed=true
	    fi
	    cp "$f" "$f.prev"
	else
	    if [ -e "$f.prev" ]; then
		changed=true
		rm "$f.prev"
	    fi
	fi
    done
done