#!/bin/sh
#
# configure [ <options> ]

# usage
#
# Prints usage.
#
usage()
{
	cat << EOF

Usage: $0 <options>
options:
  --floppy <floppy location>  Specifies the location of the floppy
                              (device or image).
  --bochs-debug               Enables bochs serial debug emulation (activated 
                              via kernel settings file).
  --cross-tools-prefix <prefix>
                              Assume cross compilation. <prefix> should be a
                              path to the directory where the cross
                              compilation tools are located, plus the platform
                              prefix, e.g. "/path/to/tools/i586-pc-beos-".
                              This overrides the HAIKU_* tool variables.
  --build-cross-tools <build tools dir>
                              Assume cross compilation. <build tools dir>
                              defines the location of the build tools sources.
                              They will be compiled and placed in the output
                              directory under "cross-tools". The HAIKU_* tools
                              variables will be set accordingly.
  --target=TARGET             Select build target platform. [default=${target}]
                              valid targets=r5,bone,dano,haiku
  --include-gpl-addons        Include GPL licensed add-ons.
  --help                      Prints out this help.

environment variables:
  HAIKU_AR                    The static library archiver. Defaults to "ar".
  HAIKU_CC                    The compiler. Defaults to "gcc".
  HAIKU_LD                    The linker. Defaults to "ld".
  HAIKU_OBJCOPY               The objcopy to be used. Defaults to "objcopy".
  HAIKU_RANLIB                The static library indexer. Defaults to "ranlib".
  HAIKU_CPPFLAGS              The preprocessor flags. Defaults to "".
  HAIKU_CCFLAGS               The C flags. Defaults to "".
  HAIKU_CXXFLAGS              The C++ flags. Defaults to "".
  HAIKU_LDFLAGS               The linker flags. Defaults to "".
  HAIKU_ARFLAGS               The flags passed to HAIKU_AR for archiving.
                              Defaults to "ru".
  HAIKU_UNARFLAGS             The flags passed to HAIKU_AR for unarchiving.
                              Defaults to "x".
EOF
}

# assertparam
#
# Checks whether at least one parameter is left.
#
assertparam()
{
	if [ $2 \< 2 ]; then
		echo $0: \`$1\': Parameter expected.
		exit 1
	fi
}

# standard_gcc_settings
#
# Sets the variables for a GCC platform.
#
standard_gcc_settings()
{
	# PLATFORM_LINKLIBS
	gcclib=`$HAIKU_CC -print-libgcc-file-name`
	gccdir=`dirname ${gcclib}`
	haikuGCCVersion=`$HAIKU_CC -dumpversion`
	haikuGCCMachine=`$HAIKU_CC -dumpmachine`
	
	HAIKU_GCC_LIB_DIR=${gccdir}
	HAIKU_GCC_LIBGCC=${gccdir}/libgcc.a
	HAIKU_GCC_GLUE_CODE="crtbegin.o crtend.o"
	HAIKU_GCC_HEADERS_DIR=${gccdir}/include
	HAIKU_GCC_LIBGCC_OBJECTS=`ar t ${HAIKU_GCC_LIBGCC}`
}

# set_default_value
#
# Set the value for a variable, if no value is set yet.
#
set_default_value()
{
	local var=$1;
	# any better way?
	(set -u; (eval "echo \${$var}") &> /dev/null) || eval "$var=$2"
}

# get_build_tool_path
#
# Gets a usable absolute path of a build tool.
#
get_build_tool_path()
{
	local var="HAIKU_$1"
	local tool=$2
	local path="${crossToolsPrefix}$tool"
	
	if [ -f "$path" ]; then
		# get absolute path
		local oldPwd=$(pwd)
		cd $(dirname "$path")
		path="$(pwd)/$(basename "$path")"
		cd $oldPwd
	else
		which "$path" &> /dev/null || {
			echo "Build tool \"$path\" not found." >&2
			exit 1
		}
	fi
	
	eval "$var=$path"
}

# get cwd and the source directory
currentDir=`pwd`
cd `dirname $0`
sourceDir=`pwd`
cd $currentDir

# default parameter values
#
platform=`uname`
haikuGCCVersion=
floppy=
bochs_debug=0
include_gpl_addons=0
target=haiku
crossToolsPrefix=
buildCrossTools=

set_default_value HAIKU_AR			ar
set_default_value HAIKU_CC			gcc
set_default_value HAIKU_LD			ld
set_default_value HAIKU_OBJCOPY		objcopy
set_default_value HAIKU_RANLIB		ranlib
set_default_value HAIKU_CPPFLAGS	""
set_default_value HAIKU_CCFLAGS		""
set_default_value HAIKU_CXXFLAGS	""
set_default_value HAIKU_LDFLAGS		""
set_default_value HAIKU_ARFLAGS		ru
set_default_value HAIKU_UNARFLAGS	x

# parse parameters
#
while [ $# \> 0 ] ; do
	case "$1" in
		--include-gpl-addons)	include_gpl_addons=1; shift 1;;
		--floppy)		assertparam "$1" $#; floppy=$2; shift 2;;
		--bochs-debug)	bochs_debug=1; shift 1;;
		--target=*)     target=`echo $1 | cut -d'=' -f2-`; shift 1;;
		--cross-tools-prefix) assertparam "$1" $#; crossToolsPrefix=$2; shift 2;;
		--build-cross-tools) assertparam "$1" $#; buildCrossTools=$2; shift 2;;
		--help | -h)	usage; exit 0;;
		*)				echo Invalid argument: \`$1\'; exit 1;;
	esac
done

# check parameters
#
if [ -n "$floppy" ]; then
	case "$floppy" in
		/*)	;;
		*)	echo "Warning: non-absolute floppy path. Parameter ignored.";
			floppy=;;
	esac
fi

# detect the build platform
case "${platform}" in
	BeOS)	revision=`uname -r`
			case "$revision" in
				6.*)	buildPlatform=dano ;;
				5.1)	buildPlatform=dano ;;
				5.0.4)	buildPlatform=bone ;;
				5.0*)	buildPlatform=r5 ;;
				*)		echo Unknown BeOS version: $revision
						exit 1 ;;
			esac
			;;
	Linux)	buildPlatform=linux ;;
	*)		echo Unsupported platform: ${platform}
			exit 1 ;;
esac

# create output directory
if [ "$currentDir" = "$sourceDir" ]; then
	outputDir=$currentDir/generated
else
	outputDir=$currentDir
fi
buildOutputDir=$outputDir/build
buildAttributesDir=$outputDir/attributes
mkdir -p $buildOutputDir || exit 1

# build cross tools from sources
if [ -n "$buildCrossTools" ]; then
	"$sourceDir/build/scripts/build_cross_tools"  "$sourceDir" \
		"$buildCrossTools" || exit 1
	crossToolsPrefix=$outputDir/cross-tools/bin/i586-pc-beos-
fi

# cross tools
if [ -n "$crossToolsPrefix" ]; then
	get_build_tool_path AR ar
	get_build_tool_path CC gcc
	get_build_tool_path LD ld
	get_build_tool_path OBJCOPY objcopy
	get_build_tool_path RANLIB ranlib
fi

# prepare gcc settings
standard_gcc_settings

# Generate BuildConfig
cat << EOF > $buildOutputDir/BuildConfig
# BuildConfig
# Note: This file has been automatically generated by configure.

FLOPPY_PATH			?= "${floppy}" ;
BOCHS_DEBUG_HACK	?= ${bochs_debug} ;
INCLUDE_GPL_ADDONS	?= ${include_gpl_addons} ;
TARGET_PLATFORM 	?= ${target} ;
HOST_PLATFORM		?= ${buildPlatform} ;

HAIKU_GCC_RAW_VERSION	?= ${haikuGCCVersion} ;
HAIKU_GCC_MACHINE		?= ${haikuGCCMachine} ;
HAIKU_GCC_LIB_DIR		?= ${HAIKU_GCC_LIB_DIR} ;
HAIKU_GCC_HEADERS_DIR	?= ${HAIKU_GCC_HEADERS_DIR} ;
HAIKU_GCC_LIBGCC		?= ${HAIKU_GCC_LIBGCC} ;

HAIKU_BUILD_ATTRIBUTES_DIR	?= ${buildAttributesDir} ;

HAIKU_AR			?= ${HAIKU_AR} ;
HAIKU_CC			?= ${HAIKU_CC} ;
HAIKU_LD			?= ${HAIKU_LD} ;
HAIKU_OBJCOPY		?= ${HAIKU_OBJCOPY} ;
HAIKU_RANLIB		?= ${HAIKU_RANLIB} ;
HAIKU_CPPFLAGS		?= ${HAIKU_CPPFLAGS} ;
HAIKU_CCFLAGS		?= ${HAIKU_CCFLAGS} ;
HAIKU_CXXFLAGS		?= ${HAIKU_CXXFLAGS} ;
HAIKU_LDFLAGS		?= ${HAIKU_LDFLAGS} ;
HAIKU_ARFLAGS		?= ${HAIKU_ARFLAGS} ;
HAIKU_UNARFLAGS		?= ${HAIKU_UNARFLAGS} ;

EOF

# Libgcc.a objects

cat << EOF > $buildOutputDir/libgccObjects
# libgcc.a objects to be linked against libroot.so
# Note: This file has been automatically generated by configure.

HAIKU_GCC_LIBGCC_OBJECTS	?= ${HAIKU_GCC_LIBGCC_OBJECTS} ;
EOF

# Generate Timezones binaries bindings

timezoneSources="africa antarctica asia australasia europe northamerica
	southamerica pacificnew etcetera factory backward"

cat << EOF > $buildOutputDir/Timezones
# Timezones used for the build
# Note: This file has been automatically generated by configure.

HAIKU_TIME_ZONE_SOURCES = ${timezoneSources} ;

EOF

for source in ${timezoneSources}; do
	f=$sourceDir/src/data/etc/timezones/$source

TZOBJECTS=`gawk '/^Zone/ { print $2 } /^Link/ { print $3 } ' $f `

cat << EOF >> $buildOutputDir/Timezones
TZ_OBJECTS on <timezone-source>${source} ?= $TZOBJECTS ;
EOF
done

# Generate a boot strap Jamfile in the output directory, if it is not in
# the source dir.

if [ "$currentDir" != "$sourceDir" ]; then

cat << EOF > $outputDir/Jamfile
# automatically generated Jamfile

HAIKU_TOP			= ${sourceDir} ;
HAIKU_OUTPUT_DIR	= ${outputDir} ;

include [ FDirName \$(HAIKU_TOP) Jamfile ] ;

EOF

fi