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# $Id$

#######################################################################
# Helpers:

# Split $PATH into words:
oldifs="$IFS"
IFS="   :"
spacepath=`echo $PATH`
IFS="$oldifs"


in_path () {
    # Does $1 exist in $PATH?
    for d in $spacepath; do
        if test -x "$d/$1"; then
            return 0
        fi
    done
    return 1
}


get_path () {
    for d in $spacepath; do
        if test -x "$d/$1"; then
            echo "$d/$1"
            return
        fi
    done
}

#######################################################################
# Defaults

#--- Options ---
# value 0: off
# value 1: on
# defaults:

set_defaults () {
	# enable_FOO=XXX
	# with_FOO=XXX
    :
}

ocamlc=`get_path ocamlc`
set_defaults

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version="1.8.2"
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exec_suffix=""

#######################################################################
# Option parsing

#ehelp_FOO="XXX"
#whelp_FOO="XXX"

# Which options exist? eoptions for enable/disable, woptions for with/without:
eoptions=""
woptions=""

# Packages to include anyway:
requires=""

print_options () {
        for opt in $eoptions; do
                e="o=\$enable_$opt"
                eval "$e"
                uopt=`echo $opt | sed -e 's/_/-/g'`
                if [ $o -gt 0 ]; then
                        echo "    -enable-$uopt"
                else
                        echo "    -disable-$uopt"
                fi
        done
        for opt in $woptions; do
                e="o=\$with_$opt"
                eval "$e"
                uopt=`echo $opt | sed -e 's/_/-/g'`
                if [ $o -gt 0 ]; then
                        echo "    -with-$uopt"
                else
                        echo "    -without-$uopt"
                fi
        done
}


usage () {
        set_defaults
        cat <<_EOF_ >&2
usage: ./configure [ options ]

_EOF_
        for opt in $eoptions; do
                e="help=\$ehelp_$opt"
                eval "$e"
                uopt=`echo $opt | sed -e 's/_/-/g'`
                echo "-enable-$uopt:" >&2
                echo "-disable-$uopt:" >&2
                echo "        $help" >&2
        done
        for opt in $woptions; do
                e="help=\$whelp_$opt"
                eval "$e"
                uopt=`echo $opt | sed -e 's/_/-/g'`
                echo "-with-$uopt:" >&2
                echo "-without-$uopt:" >&2
                echo "        $help" >&2
        done
}




while [ "$#" -gt 0 ]; do
        case "$1" in
                -enable-*)
                        opt=`echo "$1" | sed -e 's/-enable-//' -e 's/-/_/g'`
                        check_eopt "$opt"
                        eval "enable_$opt=2"
                        shift
                        ;;
                -disable-*)
                        opt=`echo "$1" | sed -e 's/-disable-//' -e 's/-/_/g'`
                        check_eopt "$opt"
                        eval "enable_$opt=-1"
                        shift
                        ;;
                -with-*)
                        opt=`echo "$1" | sed -e 's/-with-//' -e 's/-/_/g'`
                        check_wopt "$opt"
                        eval "with_$opt=2"
                        shift
                        ;;
                -without-*)
                        opt=`echo "$1" | sed -e 's/-without-//' -e 's/-/_/g'`
                        check_wopt "$opt"
                        eval "with_$opt=-1"
                        shift
                        ;;
                -version)
                        echo "$version"
                        exit 0
                        ;;
                *)
                        usage
        esac
done

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echo "Welcome to Xstrp4 version $version" >&2
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######################################################################
# Check ocamlfind

printf "%s" "Checking for findlib... "
if ocamlfind query stdlib >/dev/null 2>/dev/null; then
    echo "found"
else
    echo "not found"
    echo "Make sure that ocamlfind is in your PATH, or download findlib"
    echo "from www.ocaml-programming.de"
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    echo "ERROR"
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    exit 1
fi

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######################################################################
# immutable strings

printf "%s" "Checking for -safe-string... "

string_opts=""
if ocamlc -safe-string >/dev/null 2>/dev/null; then
    echo "yes"
    string_opts="-safe-string"
else
    echo "no"
fi

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######################################################################
# Check camlp4 version


printf "%s" "Checking for camlp4... "
if camlp4; then
    if camlp4 -loaded-modules >/dev/null 2>/dev/null; then
	echo "3.10 style"
	camlp4_style="310"
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	camlp4_opts="-package camlp4 -syntax camlp4o -ppopt pa_extend.cmo -ppopt q_MLast.cmo"
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    else
	echo "3.09 style"
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	echo "This is no longer supported. Upgrade to at least O'Caml 3.10"
	echo "ERROR"
	exit 1
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    fi
else
    echo "not found"
    echo "Make sure the camlp4 command is in your PATH"
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    echo "ERROR"
    exit 1
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fi


######################################################################
# Write Makefile.conf

echo "Writing Makefile.conf"
cat <<_EOF_ >Makefile.conf
# The Xstrp4 version:
VERSION = $version

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# whether to enable -safe-string
STRING_OPTS = $string_opts

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# Camlp4 style:
CAMLP4_STYLE = $camlp4_style

# Camlp4 options:
CAMLP4_OPTS = $camlp4_opts
_EOF_

######################################################################
# Finish

echo
echo "Please check Makefile.conf."
echo
echo "You can now compile Xstrp4 by invoking"
echo "   make all"
echo "for the bytecode compiler, and optionally by invoking"
echo "   make opt"
echo "for the native-code compiler (if supported on your architecture)."
echo "Finally, a"
echo "   make install"
echo "will install the package(s)."