configure

#!/bin/sh

set -e

MYDIR="$(dirname "$(realpath "$0")")"
CONFIG_VAR_FILE=${MYDIR}/config.vars

WITH_KALEIDOSCOPE=1
WITH_BIFROST=1
ECHO=/bin/echo

OS=$(uname)

if [ $OS == "Darwin" ];
then
	STATIC=""
else
	STATIC="-static"
fi

usage_with_default()
{
    if [ $# = 4 ]; then
	if [ "$2" = 1 ]; then
	    DEF=$3
	else
	    DEF=$4
	fi
    else
	DEF=$2
    fi
    $ECHO "  $1 (default $DEF)"
}

usage()
{
    $ECHO "Usage: ./configure [setting=value] [options]"

    $ECHO ""
    $ECHO "Options include:"
    usage_with_default "--enable/disable-kaleidoscope" "WITH_KALEIDOSCOPE" "enable" "enable"
    $ECHO "    Add libkaleidoscope that contains some utilities to build transactions"
    usage_with_default "--enable/disable-bifrost" "WITH_BIFROST" "enable" "enable"
    $ECHO "    Add libbifrost, an implementation of a Bifrost client"
    $ECHO 1
}

add_var()
{
    if [ -n "$2" ]; then
        $ECHO "Setting $1... $2"
    else
        $ECHO "$1 not found"
    fi
    $ECHO "$1=$2" >> $CONFIG_VAR_FILE
    [ -z "$3" ] || echo "#define $1 $2" >> "$3"
}

for opt in "$@"; do
    case "$opt" in
	--enable-kaleidoscope) WITH_KALEIDOSCOPE=1;;
	--disable-kaleidoscope) WITH_KALEIDOSCOPE=0;;
	--enable-bifrost) WITH_BIFROST=1;;
	--disable-bifrost) WITH_BIFROST=0;;

	--help|-h) usage;;
	*)
	    $ECHO "Unknown option '$opt'" >&2
	    usage
	    ;;
    esac
done

# Empty file, overwrite if already present
$ECHO -n > $CONFIG_VAR_FILE

add_var WITH_KALEIDOSCOPE "$WITH_KALEIDOSCOPE"
add_var WITH_BIFROST "$WITH_BIFROST"

if [ -n "$STATIC" ];
then
	add_var STATIC "$STATIC"
fi