#!/bin/sh

set -eu

trap config_failure 1 2 EXIT

usage()

{

	cat "$mb_project_dir"/config.usage

	if [ _$mb_use_custom_cfgdefs = _yes ]; then

		printf '\n\n%s%s\n' \

			" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" \

			"^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"

		printf '%s%s\n' \

			"| Listed above are configure's common switches " \

			"and environment variables.     |"

		printf '%s%s\n' \

			"| Found below are project-specific variables " \

			"and other customization options. |"

		printf '%s%s\n\n\n' \

			" ___________________________________________" \

			"__________________________________"

		cat "$mb_project_dir"/project/config/cfgdefs.usage

	fi

	exit 0

}

error_msg()

{

	echo "$@" >&2

}

warning_msg()

{

	echo "$@" >&2

}

init_vars()

{

	mb_project_dir=$(cd "$(dirname $0)" ; pwd)

	mb_pwd=$(pwd)

	mb_custom_cfgdefs_args=''

	mb_custom_cfgdefs_space=''

	sfrt_impl_dir=$mb_project_dir/sofort

	sfrt_config_dir=$sfrt_impl_dir/config

	sfrt_core_dir=$sfrt_impl_dir/core

	sfrt_config_vars=$sfrt_config_dir/config.vars

	sfrt_flag_vars=$sfrt_config_dir/flag.vars

	sfrt_cfgdefs_in=$sfrt_config_dir/cfgdefs.in

	mb_make_vars=$(cat $sfrt_config_vars \

		| grep -v -e '^#' -e '^$' | tr '[:lower:]' '[:upper:]')

	mb_impl_vars=$(cat $sfrt_config_vars \

		| grep -v -e '^#' -e '^$' | sed 's/^/mb_/g')

	mb_proj_vars=$(cat $sfrt_config_vars \

		| grep -v -e '^#' -e '^$' | sed 's/^/mb_default_/g')

	mb_flag_vars=$(cat $sfrt_flag_vars \

		| grep -v -e '^#' -e '^$')

	mb_vars="$mb_make_vars $mb_impl_vars $mb_proj_vars $mb_flag_vars"

	for mb_var in $mb_vars ; do

		mb_expr=$mb_var='${'$mb_var':-}'

		eval "$mb_expr"

	done

	# ccenv

	. $mb_project_dir/sofort/ccenv/ccenv.sh

	if ! [ -L ./ccenv ]; then

		if [ -d ./ccenv ]; then

			rm -f ./ccenv/host.mk

			rm -f ./ccenv/native.mk

			rmdir ./ccenv

		fi

	fi

	# config.project

	if [ -z "$mb_config" ]; then

		. $mb_project_dir/config.project

	else

		. "$mb_config"

	fi

	# project-specific config definitions

	if [ _$mb_use_custom_cfgdefs = _yes ]; then

		cat $sfrt_cfgdefs_in > cfgdefs.mk

	else

		printf '%s %s\n\n' \

				'# this project does not include' \

				'a custom config step.'           \

			> cfgdefs.mk

		cat $sfrt_cfgdefs_in >> cfgdefs.mk

		if [ -f $mb_project_dir/project/cfgdefs.in ]; then

			cat $mb_project_dir/project/cfgdefs.in >> cfgdefs.mk

		fi

	fi

	# user build-time overrides

	touch usrdefs.mk

	# project

	mb_nickname=$NICKNAME

	mb_source_dir=$SOURCE_DIR

	# dirs

	mb_prefix=$PREFIX

	mb_exec_prefix=$EXEC_PREFIX

	mb_bindir=$BINDIR

	mb_sbindir=$SBINDIR

	mb_libdir=$LIBDIR

	mb_includedir=$INCLUDEDIR

	mb_oldincludedir=$OLDINCLUDEDIR

	mb_mandir=$MANDIR

	mb_docdir=$DOCDIR

	mb_libexecdir=$LIBEXECDIR

	mb_sysconfdir=$SYSCONFDIR

	mb_sharedstatedir=$SHAREDSTATEDIR

	mb_localstatedir=$LOCALSTATEDIR

	mb_runstatedir=$RUNSTATEDIR

	mb_datarootdir=$DATAROOTDIR

	mb_datadir=$DATADIR

	mb_infodir=$INFODIR

	mb_localedir=$LOCALEDIR

	mb_htmldir=$HTMLDIR

	mb_dvidir=$DVIDIR

	mb_pdfdir=$PDFDIR

	mb_psdir=$PSDIR

	# build

	mb_build=$BUILD

	mb_host=$HOST

	mb_cchost=$CCHOST

	mb_cfghost=$CFGHOST

	mb_target=$TARGET

	mb_arch=$ARCH

	mb_compiler=$COMPILER

	mb_toolchain=$TOOLCHAIN

	mb_sysroot=$SYSROOT

	mb_cross_compile=$CROSS_COMPILE

	mb_shell=$SHELL

	# switches

	mb_cflags=$CFLAGS

	mb_cflags_debug=$CFLAGS_DEBUG

	mb_cflags_common=$CFLAGS_COMMON

	mb_cflags_cmdline=$CFLAGS_CMDLINE

	mb_cflags_config=$CFLAGS_CONFIG

	mb_cflags_sysroot=$CFLAGS_SYSROOT

	mb_cflags_os=$CFLAGS_OS

	mb_cflags_site=$CFLAGS_SITE

	mb_cflags_path=$CFLAGS_PATH

	mb_cflags_strict=$CFLAGS_STRICT

	mb_cflags_util=$CFLAGS_UTIL

	mb_cflags_last=$CFLAGS_LAST

	mb_cflags_once=$CFLAGS_ONCE

	mb_ldflags=$LDFLAGS

	mb_ldflags_debug=$LDFLAGS_DEBUG

	mb_ldflags_common=$LDFLAGS_COMMON

	mb_ldflags_cmdline=$LDFLAGS_CMDLINE

	mb_ldflags_config=$LDFLAGS_CONFIG

	mb_ldflags_sysroot=$LDFLAGS_SYSROOT

	mb_ldflags_path=$LDFLAGS_PATH

	mb_ldflags_strict=$LDFLAGS_STRICT

	mb_ldflags_util=$LDFLAGS_UTIL

	mb_ldflags_last=$LDFLAGS_LAST

	mb_ldflags_once=$LDFLAGS_ONCE

	mb_pe_subsystem=$PE_SUBSYSTEM

	mb_pe_image_base=$PE_IMAGE_BASE

	mb_pe_config_defs=$PE_CONFIG_DEFS

	mb_elf_eh_frame=$ELF_EH_FRAME

	mb_elf_hash_style=$ELF_HASH_STYLE

	mb_elf_config_defs=$ELF_CONFIG_DEFS

	# overrides

	mb_user_cc=$CC

	mb_user_cpp=$CPP

	mb_user_cxx=$CXX

	mb_native_cc=$NATIVE_CC

	mb_native_cpp=$NATIVE_CPP

	mb_native_cxx=$NATIVE_CXX

	mb_native_host=$NATIVE_HOST

	mb_native_cfghost=$NATIVE_CFGHOST

	mb_native_cflags=$NATIVE_CFLAGS

	mb_native_ldflags=$NATIVE_LDFLAGS

}

verify_build_directory()

{

	if [ "$mb_project_dir" = "$mb_pwd" ]; then

		if [ _$mb_require_out_of_tree = _yes ]; then

			error_msg "$mb_package: out-of-tree builds are required."

			error_msg "please invoke configure again from a clean build directory."

			exit 1

		else

			mb_project_dir='.'

		fi

	fi

	rm -f Makefile Makefile.host Makefile.tmp Makefile.failed

}

verify_source_directory()

{

	if [ -z "$mb_source_dir" ]; then

		if [ _$mb_require_source_dir = _yes ]; then

			error_msg "$mb_package: specifying an external source directory is required."

			error_msg "you can set the source directory either via --source-dir=<path>,"

			error_msg "or by setting the SOURCE_DIR variable."

			exit 1

		fi

	fi

}

common_defaults()

{

	# git

	if [ -n "$mb_source_dir" ]; then

		if [ -d "$mb_source_dir/.git" ]; then

			mb_git_reference_index="\$(SOURCE_DIR)/.git/index"

		fi

	elif [ -d "$mb_project_dir/.git" ]; then

		mb_git_reference_index="\$(PROJECT_DIR)/.git/index"

	fi

	# project

	[ -z "$mb_nickname" ] 		&& mb_nickname=$mb_package

	[ -z "$mb_source_dir" ] 	&& mb_source_dir=$mb_project_dir

	[ -z "$mb_avoid_version" ] 	&& mb_avoid_version='no'

	# pkgconfig

	[ -z "$mb_pkgname" ]		&& mb_pkgname="$mb_default_pkgname"

	[ -z "$mb_pkgdesc" ]		&& mb_pkgdesc="$mb_default_pkgdesc"

	[ -z "$mb_pkgusrc" ]		&& mb_pkgusrc="$mb_default_pkgusrc"

	[ -z "$mb_pkgrepo" ]		&& mb_pkgrepo="$mb_default_pkgrepo"

	[ -z "$mb_pkgpsrc" ]		&& mb_pkgpsrc="$mb_default_pkgpsrc"

	[ -z "$mb_pkgdurl" ]		&& mb_pkgdurl="$mb_default_pkgdurl"

	[ -z "$mb_pkgdefs" ]		&& mb_pkgdefs="$mb_default_pkgdefs"

	[ -z "$mb_pkglibs" ]		&& mb_pkglibs="$mb_default_pkglibs"

	# dirs

	[ -z "$mb_prefix" ] 		&& [ -z "$mb_prefix_set" ] \

					&& mb_prefix='/usr/local'

	[ -z "$mb_exec_prefix" ] 	&& [ -z "$mb_exec_prefix_set" ]	\

					&& mb_exec_prefix=$mb_prefix

	[ -z "$mb_bindir" ] 		&& [ -z "$mb_bindir_set" ] \

					&& [ -z "$mb_bindir_basename" ] \

					&& mb_bindir=$mb_exec_prefix/bin

	[ -z "$mb_bindir" ] 		&& [ -z "$mb_bindir_set" ] \

					&& mb_bindir=$mb_exec_prefix/$mb_bindir_basename

	[ -z "$mb_sbindir" ] 		&& mb_sbindir=$mb_exec_prefix/sbin

	[ -z "$mb_libdir" ] 		&& mb_libdir=$mb_exec_prefix/lib

	[ -z "$mb_includedir" ]		&& mb_includedir=$mb_prefix/include

	[ -z "$mb_oldincludedir" ]	&& mb_oldincludedir=$mb_prefix/include

	[ -z "$mb_datarootdir" ] 	&& mb_datarootdir=$mb_prefix/share

	[ -z "$mb_mandir" ] 		&& mb_mandir=$mb_datarootdir/man

	[ -z "$mb_docdir" ] 		&& mb_docdir=$mb_datarootdir/doc

	[ -z "$mb_libexecdir" ]		&& mb_libexecdir=$mb_exec_prefix/libexec

	[ -z "$mb_sysconfdir" ] 	&& mb_sysconfdir=$mb_exec_prefix/etc

	[ -z "$mb_sharedstatedir" ] 	&& mb_sharedstatedir=$mb_prefix/com

	[ -z "$mb_localstatedir" ] 	&& mb_localstatedir=$mb_prefix/var

	[ -z "$mb_runstatedir" ] 	&& mb_runstatedir=$mb_localstatedir/run

	[ -z "$mb_datarootdir" ] 	&& mb_datarootdir=$mb_prefix/share

	[ -z "$mb_datadir" ] 		&& mb_datadir=$mb_datarootdir

	[ -z "$mb_infodir" ] 		&& mb_infodir=$mb_datarootdir/info

	[ -z "$mb_localedir" ] 		&& mb_localedir=$mb_datarootdir/locale

	[ -z "$mb_htmldir" ] 		&& mb_htmldir=$mb_docdir

	[ -z "$mb_dvidir" ] 		&& mb_dvidir=$mb_docdir

	[ -z "$mb_pdfdir" ] 		&& mb_pdfdir=$mb_docdir

	[ -z "$mb_psdir" ] 		&& mb_psdir=$mb_docdir

	# switches

	[ -z "$mb_cflags_debug" ]	&& mb_cflags_debug=$mb_default_cflags_debug

	[ -z "$mb_cflags_common" ]	&& mb_cflags_common=$mb_default_cflags_common

	[ -z "$mb_cflags_cmdline" ]	&& mb_cflags_cmdline=$mb_default_cflags_cmdline

	[ -z "$mb_cflags_config" ]	&& mb_cflags_config=$mb_default_cflags_config

	[ -z "$mb_cflags_sysroot" ]	&& mb_cflags_sysroot=$mb_default_cflags_sysroot

	[ -z "$mb_cflags_os" ]		&& mb_cflags_os=$mb_default_cflags_os

	[ -z "$mb_cflags_site" ]	&& mb_cflags_site=$mb_default_cflags_site

	[ -z "$mb_cflags_path" ]	&& mb_cflags_path=$mb_default_cflags_path

	[ -z "$mb_cflags_strict" ]	&& mb_cflags_strict=$mb_default_cflags_strict

	[ -z "$mb_cflags_util" ]	&& mb_cflags_util=$mb_default_cflags_util

	[ -z "$mb_cflags_last" ]	&& mb_cflags_last=$mb_default_cflags_last

	[ -z "$mb_cflags_once" ]	&& mb_cflags_once=$mb_default_cflags_once

	[ -z "$mb_ldflags_debug" ]	&& mb_ldflags_debug=$mb_default_ldflags_debug

	[ -z "$mb_ldflags_common" ]	&& mb_ldflags_common=$mb_default_ldflags_common

	[ -z "$mb_ldflags_cmdline" ]	&& mb_ldflags_cmdline=$mb_default_ldflags_cmdline

	[ -z "$mb_ldflags_config" ]	&& mb_ldflags_config=$mb_default_ldflags_config

	[ -z "$mb_ldflags_sysroot" ]	&& mb_ldflags_sysroot=$mb_default_ldflags_sysroot

	[ -z "$mb_ldflags_path" ]	&& mb_ldflags_path=$mb_default_ldflags_path

	[ -z "$mb_ldflags_strict" ]	&& mb_ldflags_strict=$mb_default_ldflags_strict

	[ -z "$mb_ldflags_util" ]	&& mb_ldflags_util=$mb_default_ldflags_util

	[ -z "$mb_ldflags_last" ]	&& mb_ldflags_last=$mb_default_ldflags_last

	[ -z "$mb_ldflags_once" ]	&& mb_ldflags_once=$mb_default_ldflags_once

	# config

	[ -z "$mb_all_static" ]		&& mb_all_static='no'

	[ -z "$mb_all_shared" ]		&& mb_all_shared='no'

	[ -z "$mb_disable_frontend" ]	&& mb_disable_frontend='no'

	[ -z "$mb_disable_static" ]	&& mb_disable_static='no'

	[ -z "$mb_disable_shared" ]	&& mb_disable_shared='no'

	# host/target

	[ -z "$mb_host" ] 		&& mb_host=$mb_target

	[ -z "$mb_target" ] 		&& mb_target=$mb_host

	# sysroot

	if [ -n "$mb_sysroot" ]; then

		if [ -z "$mb_cflags_sysroot" ]; then

			mb_cflags_sysroot="--sysroot=$mb_sysroot"

		fi

		if [ -z "$mb_ldflags_sysroot" ]; then

			mb_ldflags_sysroot="--sysroot=$mb_sysroot"

		fi

	fi

	# debug

	if [ _$mb_debug = _yes ]; then

		if [ -z "$mb_cflags_debug" ]; then

			mb_cflags_debug='-g3 -O0'

		fi

	fi

	# inherited cflags & ldflags

	mb_cflags_cmdline="$mb_cflags_cmdline $mb_cflags"

	mb_ldflags_cmdline="$mb_ldflags_cmdline $mb_ldflags"

}

config_flags()

{

	mb_ldflags_tmp=" $mb_ldflags "

	mb_ldflags_libs=$(echo "$mb_ldflags_tmp" | sed 's/ -static / /g')

	if [ "$mb_ldflags_tmp" != "$mb_ldflags_libs" ]; then

		mb_ldflags="$mb_ldflags_libs"

		mb_ldflags_util="$mb_ldflags_util -static"

	fi

	# ccstrict

	if [ _$mb_ccstrict = _yes ]; then

		mb_cflags_strict='-Wall -Werror -Wextra -Wundef'

	fi

	# ldstrict

	if [ _$mb_ldstrict = _yes ]; then

		mb_ldflags_strict='-Wl,--no-undefined'

	fi

}

config_copy()

{

	mb_vars=$(cut -d'=' -f1 $sfrt_config_vars \

			| grep -v '^#')

	mb_sed_substs=" \

		$(for __var in $mb_vars; do                  \

			printf '%s"$%s"%s' "-e 's^@$__var@^'" \

				"mb_$__var" "'^g' ";           \

		done)"

	eval sed $mb_sed_substs \

		$mb_project_dir/Makefile.in    \

			| sed -e 's/[ \t]*$//g' \

			> $mb_pwd/Makefile.tmp

}

config_ccenv()

{

	mkdir -p ./ccenv

	touch ./ccenv/host.mk

	touch ./ccenv/native.mk

	ccenv_set_host_variables

	ccenv_set_native_variables

	config_copy

}

config_custom()

{

	if [ _$mb_use_custom_cfgdefs = _yes ]; then

		eval . $mb_project_dir/project/config/cfgdefs.sh \

			"$mb_custom_cfgdefs_args"

		config_copy

	fi

	if [ _$mb_use_custom_usrdefs = _yes ]; then

		. $mb_project_dir/project/usrdefs.sh

	fi

}

config_cfghost()

{

	if [ -z "$mb_cfghost" ]; then

		mb_cfghost=$mb_cchost

	fi

	sed		-e 's^@cchost@^'"$mb_cchost"'^g'     \

			-e 's^@cfghost@^'"$mb_cfghost"'^g'   \

		$mb_pwd/Makefile.tmp > $mb_pwd/Makefile.host

	rm  $mb_pwd/Makefile.tmp

	mv  $mb_pwd/Makefile.host $mb_pwd/Makefile

}

config_host()

{

	make -s host.tag && return 0

	error_msg "configure was able to generate a Makefile for the selected host,"

	error_msg "however the host-targeting compiler was found to be missing"

	error_msg "at least one of the required headers or features."

	exit 2

}

config_status()

{

	printf "\n\n"

	make .display

	printf "\nconfiguration completed successfully.\n\n"

}

config_failure()

{

	if [ -f Makefile ]; then

		mb_error='failed to use the generated Makefile.'

		printf '\n%s: error: %s\n' "${0}" "$mb_error" >&2

		mv Makefile Makefile.failed

	fi

	exit 2

}

config_success()

{

	trap '' EXIT

	exit 0

}

# one: init

init_vars

verify_build_directory

# two: args

for arg ; do

	case "$arg" in

		--help)

			usage

			;;

		--help=ccenv)

			ccenv_usage

			;;

		# ccenv

		--cross-compile=*)

			mb_cross_compile=${arg#*=}

			;;

		--compiler=*)

			mb_compiler=${arg#*=}

			;;

		--toolchain=*)

			mb_toolchain=${arg#*=}

			;;

		--zealous)

			mb_agnostic=yes

			mb_zealous=

			;;

		--zealous=*)

			mb_zealous=${arg#*=}

			;;

		--ccenv=*)

			mb_ccenv=${arg#*=}

			;;

		# dirs

		--prefix=*)

			mb_prefix_set=yes

			mb_prefix=${arg#*=}

			;;

		--exec-prefix=*)

			mb_exec_prefix_set=yes

			mb_exec_prefix=${arg#*=}

			;;

		--bindir=*)

			mb_bindir_set=yes

			mb_bindir=${arg#*=}

			;;

		--sbindir=*)

			mb_sbindir=${arg#*=}

			;;

		--libdir=*)

			mb_libdir=${arg#*=}

			;;

		--includedir=*)

			mb_includedir=${arg#*=}

			;;

		--oldincludedir=*)

			mb_oldincludedir=${arg#*=}

			;;

		--mandir=*)

			mb_mandir=${arg#*=}

			;;

		--libexecdir=*)

			mb_libexecdir=${arg#*=}

			;;

		--sysconfdir=*)

			mb_sysconfdir=${arg#*=}

			;;

		--sharedstatedir=*)

			mb_sharedstatedir=${arg#*=}

			;;

		--localstatedir=*)

			mb_localstatedir=${arg#*=}

			;;

		--runstatedir=*)

			mb_runstatedir=${arg#*=}

			;;

		--datarootdir=*)

			mb_datarootdir=${arg#*=}

			;;

		--datadir=*)

			mb_datadir=${arg#*=}

			;;

		--infodir=*)

			mb_infodir=${arg#*=}

			;;

		--localedir=*)

			mb_localedir=${arg#*=}

			;;

		--htmldir=*)

			mb_htmldir=${arg#*=}

			;;

		--dvidir=*)

			mb_dvidir=${arg#*=}

			;;

		--pdfdir=*)

			mb_pdfdir=${arg#*=}

			;;

		--psdir=*)

			mb_psdir=${arg#*=}

			;;

		# build

		--build=*)

			mb_build=${arg#*=}

			;;

		--host=*)

			mb_host=${arg#*=}

			;;

		--cchost=*)

			mb_cchost=${arg#*=}

			;;

		--cfghost=*)

			mb_cfghost=${arg#*=}

			;;

		--target=*)

			mb_target=${arg#*=}

			;;

		--arch=*)

			mb_arch=${arg#*=}

			;;

		--sysroot=*)

			mb_sysroot=${arg#*=}

			;;

		--shell=*)

			mb_shell=${arg#*=}

			;;

		--debug)

			mb_debug=yes

			;;

		# config

		--all-static)

			mb_all_static=yes

			;;

		--all-shared)

			mb_all_shared=yes

			;;

		--disable-frontend)

			mb_disable_frontend=yes

			;;

		--disable-app)

			mb_disable_frontend=yes

			;;

		--enable-frontend)

			mb_disable_frontend='no'

			;;

		--enable-app)

			mb_disable_frontend='no'

			;;

		--disable-static)

			mb_disable_static=yes

			;;

		--disable-shared)

			mb_disable_shared=yes

			;;

		--enable-static)

			mb_disable_static='no'

			;;

		--enable-shared)

			mb_disable_shared='no'

			;;

		# convenience

		--strict)

			mb_ccstrict=yes

			mb_ldstrict=yes

			;;

		--ccstrict)

			mb_ccstrict=yes

			;;

		--ldstrict)

			mb_ldstrict=yes

			;;

		# project

		--nickname=*)

			mb_nickname=${arg#*=}

			;;

		--program-prefix=*)

			mb_program_prefix=${arg#*=}

			;;

		--avoid-version)

			mb_avoid_version=yes

			;;

		--source-dir=*)

			mb_source_dir=${arg#*=}

			;;

		# pkgconfig

		--pkgname=*)

			mb_pkgname=${arg#*=}

			;;

		--pkgdesc=*)

			mb_pkgdesc=${arg#*=}

			;;

		--pkgusrc=*)

			mb_pkgusrc=${arg#*=}

			;;

		--pkgrepo=*)

			mb_pkgrepo=${arg#*=}

			;;

		--pkgpsrc=*)

			mb_pkgpsrc=${arg#*=}

			;;

		--pkgdurl=*)

			mb_pkgdurl=${arg#*=}

			;;

		--pkgdefs=*)

			mb_pkgdefs=${arg#*=}

			;;

		--pkglibs=*)

			mb_pkglibs=${arg#*=}

			;;

		# compatibility

		--enable-dependency-tracking)

			;;

		--disable-dependency-tracking)

			;;

		*)

			if [ _$mb_use_custom_cfgdefs = _yes ]; then

				mb_escaped_arg=\'$(printf '%s\n' "$arg" | sed -e "s/'/'\\\\''/g")\'

				mb_escaped_arg="$mb_custom_cfgdefs_space$mb_escaped_arg"

				mb_custom_cfgdefs_args="$mb_custom_cfgdefs_args$mb_escaped_arg"

				mb_custom_cfgdefs_space=' '

			else

				error_msg ${arg#}: "unsupported config argument."

				exit 2