#!/bin/sh

usage()
{
    echo "Use environment variables to pass values:
    CC         - compiler (default: cc)
    CFLAGS     - flags for compiler
    LDFLAGS    - flags for linker
    OUT        - out file (default: csnake
    FIELD_SIZE - size of game field
    DEFX       - start x
    DEFY       - start y
    SLEEP      - sleep between frames (ms)"
    exit 1
}

while test $# -gt 0; do
    case "$1" in
        -h) usage
            ;;
        --help) usage
            ;;
    esac
    shift
done

CC=${CC:-cc}
CFLAGS=${CFLAGS:-}
LDFLAGS=${LDFLAGS:-}
OUT=${OUT:-csnake}
FIELD_SIZE=${FIELD_SIZE:-10}
DEFX=${DEFX:-0}
DEFY=${DEFY:-0}
SLEEP=${SLEEP:-1000}

echo "Makefile configuration:"
echo "Compiler: $CC"
echo "CFLAGS: $CFLAGS"
echo "LDFLAGS: $LDFLAGS"
echo "Out file: $OUT"
echo
echo "Code configuration:"
echo "Field size: $FIELD_SIZE"
echo "Start x: $DEFX"
echo "Start y: $DEFY"
echo "Sleep: $SLEEP"

echo "CC = $CC
CFLAGS = $CFLAGS
LDFLAGS = $LDFLAGS
OUT = $OUT" > config.mk

echo "#define FIELD_SIZE $FIELD_SIZE
#define DEFX $DEFX
#define DEFY $DEFY
#define SLEEP $SLEEP" > include/config.h