#!/bin/sh

# Defaults
output=sconfig.mk
conf=sconfig.conf

me=`basename $0`

prev=
for option; do
    if test -n "$prev"; then
        eval "$prev=\$option"
        prev=
        continue
    fi

    optarg=`expr "x$option" : 'x[^=]*=\(.*\)'`
    optsub=`expr substr "$option" 3 length "$option"`

    case $option in

    --conf | -c) prev=conf ;;
    --conf=*) conf=$optarg ;;
    -c*) conf=$optsub ;;

    --output | -o) prev=output ;;
    --output=*) output=$optarg ;;
    -o*) output=$optsub ;;

    --help)
        echo "This file should be called from a makefile."
        exit 0
        ;;

    -*)
        echo "$me: error: unrecognized option: $option
Try \`$0 --help' for more information." >&2
        exit 1
        ;;

    esac
done

cppflags="$CPPFLAGS"
ldflags="$LDFLAGS"

function error()
{
    msg=$1;
    code=3;
    if test $# -ge 2; then
        code=$2
    fi
    echo $msg >&2
    exit $code
}

function usepkg()
{
    cppflags="$cppflags `pkg-config --cflags $1`"
    test $? -gt 0 && error "Could not find package: '$1'"
    ldflags="$ldflags `pkg-config --libs $1`"
}

includes='/usr/include /usr/local/include'

function uselib()
{
    lib=$1
    header=$1.h
    if test $# -ge 2; then
        header=$2
    fi
    newcppflags=
    for dir in $includes; do
        if test -f $dir/$header; then
            newcppflags="-I$dir"
            break
        fi
    done

    if test -z "$newcppflags"; then
        error "Could not find library: '$lib'"
    fi
    if test "$newcppflags" != '-I/usr/include'; then
        cppflags="$cppflags $newcppflags"
    fi
    ldflags="$ldflags -l$lib"
}

source $conf

rm -rf $output
cat >$output <<OUTPUT
CPPFLAGS := $cppflags
LDFLAGS := $ldflags
OUTPUT