#! /bin/sh -e
###
### Cheesy configuration script.
###
### (c) 2018 Straylight/Edgeware
###

###----- Licensing notice ---------------------------------------------------
###
### This file is part of the preload-hacks package.
###
### Preload-hacks are free software; you can redistribute it and/or modify
### them under the terms of the GNU General Public License as published by
### the Free Software Foundation; either version 2 of the License, or (at
### your option) any later version.
###
### Preload-hacks are distributed in the hope that it will be useful, but
### WITHOUT ANY WARRANTY; without even the implied warranty of
### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
### Public License for more details.
###
### You should have received a copy of the GNU General Public License along
### with preload-hacks; if not, write to the Free Software Foundation, Inc.,
### 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

## Check for a `help' option.
case $1,$# in
  ,0) ;;
  -h,* | --help,*)
    echo "usage: $0 [--VAR=VAL ...] -- [VAR=VAL ...]"
    exit 0
    ;;
esac

## Find a relative path to the source directory.
case $0 in */*) ;; *) echo >&2 "$0: invoke as PATH/configure"; exit 2 ;; esac
srcdir=${0%/*}

## Build the actual makefile.
rm -f Makefile.new
cat >Makefile.new <<EOF
### -*-makefile-*-
srcdir = $srcdir
include \$(srcdir)/Make.rules
EOF

## Build a configuration fragment.
rm -f config.mk.new
exec 3>config.mk.new
cat >&3 <<EOF
### -*-makefile-*-

## Settings from \`configure'.
EOF

## Parse the options.
while :; do
  case $1,$# in
    ,0) break ;;
    --,*) shift; break ;;
    --*=*) o=${1#--}; k=${o%%=*} v=${o#*=}; echo >&3 "$k = $v" ;;
    --*,*) k=${1#--}; echo >&3 "$k = t" ;;
    *) break ;;
  esac
  shift
done

## Parse any remaining assignments.
while :; do
  case $1,$# in
    ,0) break ;;
    *=*) k=${1%%=*} v=${1#*=}; echo >&3 "$k = $v" ;;
    *) echo >&2 "$0: unexpected argument $1"; exit 2 ;;
  esac
  shift
done

## All over.
exec 3>&-
mv config.mk.new config.mk
mv Makefile.new Makefile