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

# Ensure that we do not inherit these from env
DEBUG=
LIBDHCPCD=no
WITH_DHCPCD_ONLINE=yes
WITH_GTK=
WITH_QT=
NOTIFY=yes
INCLUDEDIR=
UI=

for x; do
	opt=${x%%=*}
	var=${x#*=}
	[ "$var" = "$opt" ] && var=
	case "$opt" in
	--os|OS) OS=$var;;
	--with-cc|CC) CC=$var;;
	--debug) DEBUG=$var;;
	--disable-debug) DEBUG=no;;
	--enable-debug) DEBUG=yes;;
	--prefix) prefix=$var;;
	--sysconfdir) SYSCONFDIR=$var;;
	--bindir) BINDIR=$var;;
	--libexecdir) LIBEXECDIR=$var;;
	--statedir|--localstatedir) STATEDIR=$var;;
	--rundir) RUNDIR=$var;;
	--mandir) MANDIR=$var;;
	--with-ccopts|CFLAGS) CFLAGS=$var;;
	CPPFLAGS) CPPFLAGS=$var;;
	--build) BUILD=$var;;
	--host) HOST=$var;;
	--target) TARGET=$var;;
	--libdir) LIBDIR=$var;;
	--includedir) eval INCLUDEDIR="$INCLUDEDIR${INCLUDEDIR:+ }$var";;
	--datadir|--infodir) ;; # ignore autotools
	--disable-maintainer-mode|--disable-dependency-tracking) ;;
	--with-dhcpcd-online) WITH_DHCPCD_ONLINE=${var:-yes};;
	--without-dhcpcd-online) WITH_DHCPCD_ONLINE=no;;
	--with-gtk|--with-gtk+) WITH_GTK=${var:-yes};;
	--without-gtk|--without-gtk+) WITH_GTK=no;;
	--with-qt) WITH_QT=${var:-yes};;
	--without-qt) WITH_QT=no;;
	--enable-notification) NOTIFY=yes;;
	--disable-notification) NOTIFY=no;;
	--help) echo "See the README file for available options"; exit 0;;
	*) echo "$0: WARNING: unknown option $opt" >&2;;
	esac
done

: ${INSTALL:=install}
: ${SED:=sed}

: ${PREFIX:=${prefix:=/usr/local}}
: ${SYSCONFDIR:=$PREFIX/etc}
: ${BINDIR:=$PREFIX/bin}
: ${LIBEXECDIR:=$PREFIX/libexec}
: ${STATEDIR:=/var}
: ${MANDIR:=${PREFIX:-/usr}/share/man}

: ${ICONDIR:=$PREFIX/share/dhcpcd/icons}

eval SYSCONFDIR="$SYSCONFDIR"
eval LIBDIR="$LIBDIR"
eval LIBEXECDIR="$LIBEXECDIR"
eval STATEDIR="$STATEDIR"
eval DBDIR="$DBDIR"
eval RUNDIR="$RUNDIR"
eval MANDIR="$MANDIR"

_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 "$BUILD" ]; then
	# autoconf target triplet: cpu-vendor-os
	BUILD=$(uname -m)-unknown-$(uname -s | tr '[:upper:]' '[:lower:]')
fi
: ${HOST:=$BUILD}

if [ -z "$OS" ]; then
	echo "Deriving operating system from ... $HOST"
	# Derive OS from cpu-vendor-[kernel-]os
	CPU=${HOST%%-*}
	REST=${HOST#*-}
	if [ "$CPU" != "$REST" ]; then
		VENDOR=${REST%%-*}
		REST=${REST#*-}
		if [ "$VENDOR" != "$REST" ]; then
			# Use kernel if given, otherwise os
			OS=${REST%%-*}
		else
			# 2 tupple
			OS=$VENDOR
			VENDOR=
		fi
	fi

        # Work with cpu-kernel-os, ie Debian
	case "$VENDOR" in
	linux*|kfreebsd*) OS=$VENDOR; VENDOR= ;;
	esac
	# Special case
	case "$OS" in
	gnu*) OS=hurd;; # No HURD support as yet
	esac
fi

echo "Configuring dhcpcd for ... $OS"
rm -f $CONFIG_H $CONFIG_MK
echo "# $OS" >$CONFIG_MK
echo "/* $OS */" >$CONFIG_H

VERSION=$($SED -ne 's/VERSION=	//p' Makefile)
echo "#define VERSION		\"$VERSION\"" >>$CONFIG_H

for x in PREFIX SYSCONFDIR BINDIR; do
	eval v=\$$x
	# Make files look nice for import
	l=$((10 - ${#x}))
	unset t
	[ $l -gt 3 ] && t="	"
	echo "$x=$t	$v" >>$CONFIG_MK
	unset t
	[ $l -gt 2 ] && t="	"
	echo "#define $x$t	\"$v\"" >>$CONFIG_H
done
echo "#define ICONDIR		\"$ICONDIR\"" >>$CONFIG_H
echo "MANDIR=		$MANDIR" >>$CONFIG_MK

# Always obey CC.
# However, if CC is not specified and we are given GNU style
# --host or --build targets the expectation is we try and match that
# to a compiler.
if [ -n "$CC" ]; then
	HOSTCC=
else
	CC=cc
	_COMPILERS="cc clang gcc pcc icc"
fi
if [ -n "$HOSTCC" ]; then
	for _CC in $_COMPILERS; do
		_CC=$(_which "$HOSTCC$_CC")
		if [ -x "$_CC" ]; then
			CC=$_CC
			break
		fi
	done
fi
if ! type "$CC" >/dev/null 2>&1; then
	for _CC in $_COMPILERS; do
		_CC=$(_which "$_CC")
		if [ -x "$_CC" ]; then
			CC=$_CC
			break
		fi
	done
fi

echo "Using compiler .. $CC"
cat <<EOF >_test.c
int main(void) {
	return 0;
}
EOF
_CC=false
if $CC _test.c -o _test >/dev/null 2>&1; then
	[ -x _test ] && _CC=true
fi
rm -f _test.c _test
if ! $_CC; then
	echo "$CC does not create executables"
	exit 1
fi
[ "$CC" != cc ] && echo "CC=	$CC" >>$CONFIG_MK
$CC --version | $SED -e '1!d'

# Set to blank, then append user config
# We do this so our SED call to append to XCC remains portable
if [ -n "$CFLAGS" ]; then
	echo "CFLAGS=" >>$CONFIG_MK
	echo "CFLAGS+=	$CFLAGS" >>$CONFIG_MK
fi
if [ -n "$CPPFLAGS" ]; then
	echo "CPPFLAGS=" >>$CONFIG_MK
	echo "CPPFLAGS+=	$CPPFLAGS" >>$CONFIG_MK
fi
if [ -n "$LDFLAGS" ]; then
	echo "LDFLAGS=" >>$CONFIG_MK
	echo "LDFLAGS+=	$LDFLAGS" >>$CONFIG_MK
fi

for x in $INCLUDEDIR; do
	echo "CPPFLAGS+=	-I$x" >>$CONFIG_MK
done

if [ -z "$DEBUG" -a -f .fslckout ]; then
	printf "Found fossil checkout ... "
	DEBUG=yes
else
	DEBUG=no
fi
if [ "$DEBUG" != no -a "$DEBUG" != false ]; then
	echo "Adding debugging CFLAGS"
	cat <<EOF >>$CONFIG_MK
CFLAGS+=	-g -Wall -Wextra -Wshadow -Wformat=2
CFLAGS+=	-Wmissing-prototypes -Wmissing-declarations
CFLAGS+=	-Wmissing-noreturn -Wmissing-format-attribute
CFLAGS+=	-Wnested-externs
CFLAGS+=	-Winline -Wwrite-strings -Wcast-align -Wcast-qual
CFLAGS+=	-Wpointer-arith -Wstrict-overflow
CFLAGS+=	-Wdeclaration-after-statement
CFLAGS+=	-Wconversion
EOF
	case "$OS" in
	mirbsd*|openbsd*);; # OpenBSD has many redundant decs in system headers
	*)		echo "CFLAGS+=	-Wredundant-decls" >>$CONFIG_MK;;
	esac
else
	# Disable assertations
	echo "CFLAGS+=	-DNDEBUG" >>$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`"

if [ -z "$GETTEXT" ]; then
	printf "Testing for gettext ... "
	cat <<EOF >_gettext.c
#include <libintl.h>
int main(void) {
	gettext("foo");
	return 0;
}
EOF
	LIB_INTL=
	if $XCC _gettext.c -o _gettext 2>/dev/null; then
		GETTEXT=yes
	elif $XCC _gettext.c -o _gettext -lintl 2>/dev/null; then
		GETTEXT="yes (-lintl)"
		LIB_INTL=-lintl
		QMAKE_CONFIG="CONFIG+=has_libintl"
	else
		GETTEXT=no
	fi
	echo "$GETTEXT"
	rm -f _gettext.c _gettext
fi
if [ "$GETTEXT" != no ]; then
	echo "#define HAS_GETTEXT" >>$CONFIG_H
	echo "LIB_INTL=	$LIB_INTL" >>$CONFIG_MK
fi

if [ -z "$STRLCPY" ]; then
	printf "Testing 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
fi
if [ "$STRLCPY" = no ]; then
	echo "#define strlcpy(dst, src, n) " \
	    "((size_t)snprintf(dst, n, \"%s\", src))" \
	    >>$CONFIG_H
fi

if [ -z "$LIBDIR" ]; then
	printf "lib directory name ... "
	case `readlink /lib` in
		"") LIBNAME="lib";;
		*) LIBNAME=$(basename `readlink /lib`);;
	esac
	echo "$LIBNAME"
	echo "LIBNAME=	$LIBNAME" >>$CONFIG_MK
	LIBDIR=${PREFIX}/${LIBNAME}
	echo "LIBDIR=		\${PREFIX}/\${LIBNAME}" >>$CONFIG_MK
else
	echo "LIBDIR=	$LIBDIR" >>$CONFIG_MK
fi

# We normally want to build in the static library
if [ "$LIBDHCPCD" = yes ]; then
	x="-ldhcpcd"
	echo "LIB_DHCPCD_INSTALL=	_libinstall" >>$CONFIG_MK
else
	x="-Wl,-Bstatic -ldhcpcd -Wl,-Bdynamic"
fi
echo "LIB_DHCPCD=	$x" >>$CONFIG_MK

# Due to our use of pkg-config, pass --as-needed to ld so we only link
# what we actually need.
echo "LDADD+=		-Wl,--as-needed" >>$CONFIG_MK

if [ "$WITH_GTK" = yes -o -z "$WITH_GTK" ]; then
	if pkg-config --cflags gtk+-2.0 >/dev/null 2>&1; then
		WITH_GTK="gtk+-2.0"
	elif pkg-config --cflags gtk+-3.0 >/dev/null 2>&1; then
		WITH_GTK="gtk+-3.0"
	fi
elif [ -n "$WITH_GTK" -a "$WITH_GTK" != no ]; then
	if ! pkg-config --cflags $WITH_GTK >/dev/null; then
		echo "$0: no suitable GTK+ library has been found" >&2
		exit 1
	fi
fi
	
if [ -n "$WITH_GTK" -a "$WITH_GTK" != no ]; then
	PKG="$WITH_GTK"
	if [ "$NOTIFY" = yes ]; then
		PKG="$PKG${PKG:+ }libnotify"
		echo "NOTIFY=		-DNOTIFY" >>$CONFIG_MK
	fi
	GTK_CFLAGS=$(pkg-config --cflags $PKG)
	[ $? != 0 -a "$WITH_GTK" = yes ] && exit 1
	GTK_LIBS=$(pkg-config --libs $PKG)
	[ $? != 0 -a "$WITH_GTK" = yes ] && exit 1
	echo "GTK+ CFLAGS=$GTK_CFLAGS"
	echo "GTK+ LIBS=$GTK_LIBS"
	echo "GTK_CFLAGS=	$GTK_CFLAGS" >>$CONFIG_MK
	echo "GTK_LIBS=	$GTK_LIBS" >>$CONFIG_MK
	UI="$UI${UI:+ }dhcpcd-gtk"
fi

DHCPCD_QT=false
if [ "WITH_QT" = yes -o -z "$WITH_QT" ]; then
	if type qmake >/dev/null 2>&1; then
		UI="$UI${UI+ }dhcpcd-qt"
		DHCPCD_QT=true
	fi
elif [ -n "$WITH_QT" -a "$WITH_QT" != no ]; then
	if type qmake >/dev/null 2>&1; then
		UI="$UI${UI+ }dhcpcd-qt"
		DHCPCD_QT=true
	else
		echo "$0: no suitable QT library has been found" >&2
		exit 1
	fi
fi

if [ -n "$UI" ]; then
	echo "MKICONS=	icons" >>$CONFIG_MK
fi

if [ -n "$WITH_DHCPCD_ONLINE" -a "$WITH_DHCPCD_ONLINE" != no ]; then
	UI="dhcpcd-online${UI:+ }$UI"
fi
echo "UI=		$UI" >>$CONFIG_MK

echo
echo "   SYSCONFDIR =		$SYSCONFDIR"
echo "   BINDIR =		$BINDIR"
echo "   LIBDIR = 		$LIBDIR"
echo "   ICONDIR = 		$ICONDIR"
echo "   MANDIR =		$MANDIR"
echo "   UI =			$UI"
echo

echo "MKDIR=		\${TOPDIR}/mk" >>$CONFIG_MK

if $DHCPCD_QT; then
	QMAKE_CONFIG="$QMAKE_CONFIG PREFIX=$PREFIX MANDIR=$MANDIR"
	if ! (cd src/dhcpcd-qt; qmake $QMAKE_CONFIG dhcpcd-qt.pro); then
		echo "$0: failed to configure dhcpcd-qt" >&2
		exit 1
	fi
fi