#!/bin/sh
# Try and be like autotools configure, but without autotools

# Ensure that we do not inherit these from env
STRLCPY=
STRLCAT=
OS=
BUILD=
HOST=
TARGET=
DEBUG=
BUILD_API_DOCS=
BUILD_PIE=
EXTERNAL_PROPLIB=

usage()
{
	cat <<_EOF
\`configure' configures XBPS to adapt to many kinds of systems.

By default, \`make install' will install all the files in
\`/usr/local/sbin', \`/usr/local/lib' etc.  You can specify
an installation prefix other than \`/usr/local' using \`--prefix',
for instance \`--prefix=\$HOME'.

--prefix=DIR		install architecture-independent files in PREFIX
--sbindir=DIR		system admin executables [PREFIX/sbin]
--libdir=DIR		object code libraries [PREFIX/lib]
--includedir=DIR	C header files [PREFIX/include]
--mandir=DIR		man documentation [PREFIX/share/man]
--datadir=DIR		read-only architecture-independent data [PREFIX/share]

--debug			Build with debugging code and symbols
--with-pie		Build XBPS programs as PIE (default disabled)
--with-api-docs		install XBPS API Library documentation (default disabled)
--with-external-proplib	Use external proplib [default disabled]

_EOF
	exit 1
}

for x; do
	opt=${x%%=*}
	var=${x#*=}
	case "$opt" in
	--debug) DEBUG=yes;;
	--prefix) PREFIX=$var;;
	--sbindir) SBINDIR=$var;;
	--mandir) MANDIR=$var;;
	--datadir) SHAREDIR=$var;;
	--build) BUILD=$var;;
	--host) HOST=$var;;
	--target) TARGET=$var;;
	--includedir) INCLUDEDIR=$var;;
	--libdir) LIBDIR=$var;;
	--datadir|--infodir) ;; # ignore autotools
	--with-api-docs) BUILD_API_DOCS=$var;;
	--with-pie) BUILD_PIE=$var;;
	--with-external-proplib) EXTERNAL_PROPLIB=$var;;
	--help) usage;;
	*) echo "$0: WARNING: unknown option $opt" >&2;;
	esac
done

: ${SED:=sed}

: ${PREFIX:=/usr/local}
: ${SYSCONFDIR:=${PREFIX}/etc}
: ${SBINDIR:=${PREFIX}/sbin}
: ${LIBDIR:=${PREFIX}/lib}
: ${SHAREDIR:=${PREFIX}/share}
: ${MANDIR:=${PREFIX}/share/man}
: ${INCLUDEDIR:=${PREFIX}/include}
: ${TOPDIR:=..}

_which()
{
	x="$(which "$1" 2>/dev/null)"
	if [ -n "$x" ]; then
		echo "$x"
		return 0
	fi
	for x in /sbin/"$1" /usr/sbin/"$1" \
		/usr/pkg/sbin/"$1" /usr/local/sbin/"$1"
	do
		if [ -e "$x" ]; then
			echo "$x"
			return 0
		fi
	done
	return 1
}

CONFIG_H=config.h
CONFIG_MK=config.mk

if [ -z "$BUILD" ]; then
	BUILD=`uname -m`-unknown-`uname -s | tr '[:upper:]' '[:lower:]'`
fi
if [ -z "$HOST" ]; then
	[ -z "$TARGET" ] && TARGET=$BUILD
	HOST=$TARGET
fi
if [ -z "$TARGET" ]; then
	[ -z "$HOST" ] && HOST=$BUILD
	TARGET=$HOST
fi

if [ -z "$OS" ]; then
	# Derive OS from cpu-manufacturer-os-kernel
	CPU=${TARGET%%-*}
	REST=${TARGET#*-}
	MANU=${REST%%-*}
	REST=${REST#*-}
	OS=${REST%%-*}
	REST=${REST#*-}
	KERNEL=${REST%%-*}
fi

echo "Configuring xbps for ... $OS"
rm -f $CONFIG_H $CONFIG_MK
echo "# Common vars used by XBPS on $OS." >$CONFIG_MK
echo "/* $OS */" >$CONFIG_H

echo "TOPDIR ?=	$TOPDIR" >>$CONFIG_MK
echo "PREFIX ?=	$PREFIX" >>$CONFIG_MK
echo "SBINDIR ?= $SBINDIR" >>$CONFIG_MK
echo "INCLUDEDIR ?=	$INCLUDEDIR" >>$CONFIG_MK
echo "LIBDIR ?=	$LIBDIR" >>$CONFIG_MK
echo "MANDIR ?=	$MANDIR" >>$CONFIG_MK
echo "SHAREDIR ?= $SHAREDIR" >>$CONFIG_MK

[ -z "$DEBUG" ] && DEBUG=no
[ -z "$BUILD_PIE" ] && BUILD_PIE_VAL=no

if [ -z "$CC" ]; then
	printf "Looking for compiler ... "
	for b in $TARGET- ""; do
		for cc in gcc pcc icc cc clang; do
			if type $b$cc >/dev/null 2>&1; then
				CC=$b$cc
				echo "$CC"
				break
			fi
		done
		[ -n "$CC" ] && break
	done
	if [ -z "$CC" ]; then
		echo
		echo "no suitable compiler found - aborting" >&2
		exit 1
	fi
else
	echo "Using compiler $CC"
fi
echo "CC = 		$CC" >>$CONFIG_MK
echo "CFLAGS = 		-fPIC -DPIC" >>$CONFIG_MK
echo "LDFLAGS =  	-L\$(TOPDIR)/lib -L\$(LIBDIR)" >>$CONFIG_MK
echo "CPPFLAGS = 	-I. -I\$(TOPDIR) -I\$(TOPDIR)/include" >>$CONFIG_MK
echo "CPPFLAGS +=	-DHAVE_CONFIG_H" >>$CONFIG_MK

if [ -n "$DEBUG" -a "$DEBUG" != no -a "$DEBUG" != false ]; then
	echo "Building with debugging symbols."
	echo "INSTALL_STRIPPED =" >>$CONFIG_MK
	echo "CFLAGS +=	-g" >>$CONFIG_MK
	echo "CPPFLAGS +=	-DDEBUG" >>$CONFIG_MK
else
	echo "INSTALL_STRIPPED =	-s" >>$CONFIG_MK
fi

case "$OS" in
linux)
	echo "CPPFLAGS += 	-D_XOPEN_SOURCE=600 -D_GNU_SOURCE" >>$CONFIG_MK
	echo "CPPFLAGS += 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE" >> $CONFIG_MK
	echo "CPPFLAGS += 	-D_LARGE_FILES" >> $CONFIG_MK
	;;
*)
	;;
esac


#
# Check if external proplib should be used instead.
#
if [ -z "$EXTERNAL_PROPLIB" ]; then
	EXTERNAL_PROPLIB_VALUE=no
	echo "CPPFLAGS +=	-I\$(TOPDIR)/lib/portableproplib" >>$CONFIG_MK
else
	EXTERNAL_PROPLIB_VALUE=yes
	echo "USE_EXTERNAL_PROPLIB =	1" >>$CONFIG_MK
	echo "LDFLAGS +=	-lprop" >>$CONFIG_MK
	echo "STATIC_PROPLIB =	-lprop" >> $CONFIG_MK
fi


# Add CPPFLAGS and CFLAGS to CC for testing features
XCC="$CC `$SED -n -e 's/CPPLAGS+=*\(.*\)/\1/p' $CONFIG_MK`"
XCC="$XCC `$SED -n -e 's/CFLAGS+=*\(.*\)/\1/p' $CONFIG_MK`"

check_compiler_flag()
{
	local flag="$1"
	local mode="$2"
	local var="$3"
	local rv=0

	if [ -z "$var" ]; then
		var="CFLAGS"
	fi

	printf "Checking if $CC supports -${mode}${flag} ... "
	cat <<EOF >_ccflag.c
#include <stdio.h>
int main(void) { return 0; }
EOF
	if $XCC -${mode}${flag} _ccflag.c -o _ccflag 2>_ccflag.err; then
		if ! test -s _ccflag.err; then
			if [ "$mode" = "W" ]; then
				echo "CPPFLAGS +=	-${mode}${flag}" >>$CONFIG_MK
			else
				echo "$var +=	-${mode}${flag}" >>$CONFIG_MK
			fi
			echo "yes."
		else
			rv=1
			echo "no."
		fi
	else
		rv=1
		echo "no."
	fi
	rm -f _ccflag.c _ccflag _ccflag.err
	return $rv
}

#
# Check for some compiler warning flags.
#
for f in all extra error shadow "format=2" missing-prototypes \
	missing-declarations nested-externs \
	cast-align cast-qual pointer-arith comment unused-macros \
	declaration-after-statement stack-protector; do
	check_compiler_flag ${f} W
done

#
# Check for some compiler flags.
#
check_compiler_flag stack-protector-all f
if [ $? -ne 0 ]; then
	check_compiler_flag stack-protector f
fi
if [ $? -eq 0 ]; then
	check_compiler_flag "param ssp-buffer-size=1" -
fi
if [ $? -eq 0 ]; then
	echo "CPPFLAGS +=	-D_FORTIFY_SOURCE=2" >>$CONFIG_MK
fi
check_compiler_flag "visibility=default" f SHAREDLIB_CFLAGS
check_compiler_flag "std=c99"

#
# Check if -fPIE and -pie are supported if --build-pie is set.
#
if [ -n "$BUILD_PIE" ]; then
	BUILD_PIE_VAL=yes
	echo "Building programs as PIE (Position Independent Executable)."
	check_compiler_flag PIE f PROG_CFLAGS
	check_compiler_flag pie "" PROG_LDFLAGS
fi

#
# Check for strlcpy().
#
printf "Checking for strlcpy() ... "
cat <<EOF >_strlcpy.c
#include <string.h>
int main(void) {
	const char s1[] = "foo";
	char s2[10];
	strlcpy(s2, s1, sizeof(s2));
	return 0;
}
EOF
if $XCC _strlcpy.c -o _strlcpy 2>/dev/null; then
	STRLCPY=yes
else
	STRLCPY=no
fi
echo "$STRLCPY."
rm -f _strlcpy.c _strlcpy
if [ "$STRLCPY" = no ]; then
	echo "COMPAT_SRCS +=	compat/strlcpy.o" >>$CONFIG_MK
	echo "#include \"strlcpy.h\"" >>$CONFIG_H
	echo "CPPFLAGS +=	-DHAVE_STRLCPY" >> $CONFIG_MK
fi

#
# Check for strlcat().
printf "Checking for strlcat() ... "
cat <<EOF > _strlcat.c
#include <string.h>
int main(void) {
	const char src[] = "foo"
	char dst[10];
	strlcat(dst, src, sizeof(dst));
	return 0;
}
EOF
if $XCC _strlcat.c -o _strlcat 2>/dev/null; then
	STRLCAT=yes
else
	STRLCAT=no
fi
echo "$STRLCAT."
rm -f _strlcat.c _strlcat
if [ "$STRLCAT" = no ]; then
	echo "COMPAT_SRCS +=	compat/strlcat.o" >>$CONFIG_MK
	echo "#include \"strlcat.h\"" >>$CONFIG_H
	echo "CPPFLAGS +=	-DHAVE_STRLCAT" >>$CONFIG_MK
fi

#
# If building API library documentation, doxygen and graphviz are required.
#
if [ -n "$BUILD_API_DOCS" ]; then
	echo "Building API documentation via doxygen and graphviz."
	printf "Checking for doxygen ..."
	DOXYGEN_BIN=$(_which doxygen)
	if [ -z "$DOXYGEN_BIN" ]; then
		echo "not found, exiting."
		exit 1
	else
		echo yes
	fi
	printf "Checking for graphviz ... "
	DOT_BIN=$(_which dot)
	if [ -z "$DOT_BIN" ]; then
		echo "dot(1) command not found, exiting."
		exit 1
	else
		echo yes
	fi

	echo "BUILD_API_DOCS=	yes" >> $CONFIG_MK
	BUILD_API_DOCS_VALUE=yes
else
	BUILD_API_DOCS_VALUE=no
fi

#
# pkg-config is required to know dependencies for static linking.
#
printf "Checking for pkg-config ... "
PKGCONFIG_BIN=$(_which pkg-config)
if [ -z "$PKGCONFIG_BIN" ]; then
	echo "not found, exiting."
	exit 1
else
	echo yes
fi

#
# zlib with pkg-config support is required.
#
printf "Checking for zlib via pkg-config ..."
if ! $PKGCONFIG_BIN --exists zlib; then
	echo "zlib.pc file not found, exiting."
	exit 1
else
	echo "found version $($PKGCONFIG_BIN --modversion zlib)."
fi

echo "STATIC_LIBS = -lz \$(STATIC_PROPLIB) -lpthread" >>$CONFIG_MK

#
# OpenSSL libssl with pkg-config support is required.
#
printf "Checking for OpenSSL via pkg-config ..."
if ! $PKGCONFIG_BIN --exists libssl; then
	echo "libssl.pc file not found, exiting."
	exit 1
else
	echo "found version $($PKGCONFIG_BIN --modversion libssl)."
fi

echo "STATIC_LIBS +=	$($PKGCONFIG_BIN --libs --static libssl)" >>$CONFIG_MK

#
# libarchive >= 2.8.0 with pkg-config support is required.
#
printf "Checking for libarchive via pkg-config ... "
if ! $PKGCONFIG_BIN --exists libarchive; then
	echo "libarchive.pc file not found, exiting."
	exit 1
else
	echo "found version $($PKGCONFIG_BIN --modversion libarchive)."
fi

echo "STATIC_LIBS +=	$($PKGCONFIG_BIN --libs --static libarchive)" >>$CONFIG_MK

echo
echo "  XBPS has been configured with the following options:"
echo
echo "   SBINDIR =		$SBINDIR"
echo "   LIBDIR =		$LIBDIR"
echo "   INCLUDEDIR =		$INCLUDEDIR"
echo "   SHAREDIR =		$SHAREDIR"
echo "   MANDIR =		$MANDIR"
echo "   BUILD_API_DOCS =	$BUILD_API_DOCS_VALUE"
echo "   BUILD_PIE =		$BUILD_PIE_VAL"
echo "   DEBUG =		$DEBUG"
echo "   EXTERNAL PROPLIB =	$EXTERNAL_PROPLIB_VALUE"
echo
echo "  You can now run make && make install clean."
echo

exit 0