#!/bin/sh

prefix="/usr/local"

while [ $# -gt 0 ]; do
    arg=$1
    shift
    case "$arg" in
        "--redo" | "-r")
            if [ -f ./configvar_cache ]; then
                . ./configvar_cache
            fi
            ;;
        "--prefix" | "-p")
            prefix=$1
            shift
            ;;
        --prefix=*)
            prefix=`echo $arg | sed 's/^--prefix=//g'`
            ;;
        "--help" | "-h")
            echo "Usage:"
            echo "      --prefix | -p: The prefix to install to"
            exit
            ;;
        *) echo "Unrecognized argument $arg";;
    esac
done

OS=`uname`
MACH=`uname -m`

rm -f config.mk
rm -f config.h
rm -f mbld/config.myr
rm -f configvar_cache

echo export INST_ROOT=$prefix >> config.mk

echo "pkg config = " >> mbld/config.myr

symprefix='""'
defaultasm='Gnugaself'
sysinit=''
env='[][:]'
case $OS in
    *Linux*)
        echo 'export SYS=linux' >> config.mk
        echo export INST_MAN=$prefix/share/man/man >> config.mk
        echo 'const Sys = "Linux"' >> mbld/config.myr
        echo 'const Linkcmd = ["ld", "--gc-sections"]' >> mbld/config.myr
        echo 'const Dlflags = ["-dynamic-linker",' \
            '"/lib64/ld-linux-x86-64.so.2"]' >> mbld/config.myr
        echo "const Manpath = \"share/man/man\"" >> mbld/config.myr
        ;;
    *Darwin*)
	symprefix='"_"'
	defaultasm=Gnugasmacho
	sysinit='setenv("MACOSX_DEPLOYMENT_TARGET", "10.6", 0)'
        echo 'export SYS=osx' >> config.mk
        echo export INST_MAN=$prefix/share/man/man >> config.mk
        echo export MACOSX_DEPLOYMENT_TARGET=10.6 >> config.mk
        echo 'const Sys = "OSX"' >> mbld/config.myr
        echo 'const Linkcmd = ["ld", ' \
            '"-pagezero_size", "0x100000000",' \
            '"-macosx_version_min", "10.6",'\
            ']' >> mbld/config.myr
        echo "const Manpath = \"share/man/man\"" >> mbld/config.myr
        echo 'const Dlflags : byte[:][:] = [][:]' >> mbld/config.myr
	env='[("MACOSX_DEPLOYMENT_TARGET", "10.6")][:]'
        ;;
    *FreeBSD*)
        echo 'export SYS=freebsd' >> config.mk
        echo export INST_MAN=$prefix/man/man >> config.mk
        echo 'const Sys = "FreeBSD"' >> mbld/config.myr
        echo 'const Linkcmd = ["ld", "--gc-sections"]' >> mbld/config.myr
        echo 'const Dlflags : byte[:][:] = [][:]' >> mbld/config.myr
        echo "const Manpath = \"man/man\"" >> mbld/config.myr
        ;;
    *NetBSD*)
        echo 'export SYS=netbsd' >> config.mk
        echo export INST_MAN=$prefix/man/man >> config.mk
        echo 'const Sys = "NetBSD"' >> mbld/config.myr
        echo 'const Linkcmd = ["ld"]' >> mbld/config.myr
        echo 'const Dlflags : byte[:][:] = [][:]' >> mbld/config.myr
        echo "const Manpath = \"man/man\"" >> mbld/config.myr
        ;;
    *OpenBSD*)
        echo 'export SYS=openbsd' >> config.mk
        echo export INST_MAN=$prefix/man/man >> config.mk
        echo 'const Sys = "OpenBSD"' >> mbld/config.myr
        echo 'const Linkcmd = ["ld", "-nopie", "--gc-sections"]' >> mbld/config.myr
        echo 'const Dlflags = ["-dynamic-linker",' \
            '"/usr/libexec/ld.so"]' >> mbld/config.myr
        echo "const Manpath = \"man/man\"" >> mbld/config.myr
        ;;
    *)
        echo ''
        echo '********************************'
        echo 'Unknown system '$OS
        echo 'Cannot build'
        echo '********************************'
        rm -f config.h config.mk
        exit 1
        ;;
esac

# config.h
echo '#define Instroot "'$prefix'"' >> config.h
echo '#define Asmcmd {"as", "-o", NULL}' >> config.h
echo '#define Objsuffix ".o"' >> config.h
echo 'export SYSCLASS=posixy' >> config.mk
echo '#define Symprefix' $symprefix >> config.h
echo '#define Defaultasm' $defaultasm >> config.h
echo '#define Sysinit ' $sysinit >> config.h

# mbld mbld/config.myr
echo "const Instroot = \"$prefix\"" >> mbld/config.myr
echo "const Objsuffix = \".o\"" >> mbld/config.myr
echo "const Arcmd = [\"ar\", \"-rcs\"]" >> mbld/config.myr
echo "const Ascmd = [\"as\", \"-g\"]" >> mbld/config.myr
echo "const Directlib = false" >> mbld/config.myr
echo "const Runtime = \"_myrrt.o\"" >> mbld/config.myr

# paths to install to
echo "const Sharepath = \"share\"" >> mbld/config.myr
echo "const Binpath = \"bin\"" >> mbld/config.myr
echo "const Libpath = \"lib/myr\"" >> mbld/config.myr
echo "const Env : (byte[:], byte[:])[:] = $env" >> mbld/config.myr


case $MACH in
    *x86_64* | *amd64*)
	echo 'export ARCH=x64' >> config.mk
        echo 'const Arch = "x64"' >> mbld/config.myr
        ;;
    *)
        echo ''
        echo '********************************'
        echo 'Unknown arch '$MACH
        echo 'Cannot build'
        echo '********************************'
	;;
esac

echo ';;' >> mbld/config.myr

echo "prefix=$prefix" > configvar_cache
cat << EOF
    Building with:
        prefix=$prefix
EOF