# Copyright Rene Rivera 2014-2015
# Distributed under the Boost Software License, Version 1.0.
# See http://www.boost.org/LICENSE_1_0.txt

rule get-dir-option ( option )
{
    local path
        = [ MATCH $(option)=(.*) : $(ARGV) ] ;
    local is-rooted
        = [ MATCH "^([/]+)" : $(path) ] [ MATCH "^(.:\\[^\\])" : $(path) ] ;
    if ! $(is-rooted)
    {
        local pwd = [ PWD ] ;
        path = $(pwd)/$(path) ;
    }
    # ECHO @@@ $(option) ==> $(path) ;
    return $(path) ;
}

BOOST_ROOT ?= [ get-dir-option --boost-root ] ;
BOOST_BUILD ?= [ get-dir-option --boost-build ] ;
BOOST_BUILD ?= $(BOOST_ROOT)/tools/build/src ;
INSTALL_PREFIX ?= $(PREFIX) ;
INSTALL_PREFIX ?= [ get-dir-option --prefix ] ;
INSTALL_PREFIX ?= $(.boost-build-file:D)/stage ;
INSTALL_PREFIX_EXEC ?= $(EPREFIX) ;
INSTALL_PREFIX_EXEC ?= [ get-dir-option --exec-prefix ] ;
INSTALL_PREFIX_EXEC ?= $(INSTALL_PREFIX)/bin ;

local error ;
local help ;
if ( --help in $(ARGV) ) || ( -h in $(ARGV) )
{
    help = YES ;
}
if ! $(error) && ! $(help) && ! $(BOOST_ROOT)
{
    error = "Boost root not specified or found." ;
}
if ! $(error) && ! $(help) && ! $(BOOST_BUILD)
{
    error = "Boost Build not specified or found." ;
}
if $(error) || $(help)
{
    EXIT
        "\nERROR: $(error)\n"
        "\nUsage:"
        "b2"
        "--boost-root=<BOOST_ROOT>"
        "[ --boost-build=<BOOST_BUILD> ]"
        "[ --prefix=<PREFIX> ]"
        "[ --exec-prefix=<EPREFIX> ]"
        "\n" ;
}

boost-build $(BOOST_BUILD) ;