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

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

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) ;;
	--icondir) ICONDIR=$var;;
	--with-gtk|--with-gtk+) WITH_GTK=${var:-yes};;
	--without-gtk|--without-gtk+) WITH_GTK=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 "$BUILD" ]; then
	BUILD=`uname -m`-unknown-`uname -s | tr '[:upper:]' '[:lower:]'`
fi
if [ -z "$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=${TARGET#*-}
	if [ "$CPU" != "$REST" ]; then
		MANU=${REST%%-*}
		REST=${REST#*-}
		if [ "$MANU" != "$REST" ]; then
			OS=${REST%%-*}
			REST=${REST#*-}
			if [ "$OS" != "$REST" ]; then
				KERNEL=${REST%%-*}
			else
				# 3 tupple
				KERNEL=$OS
				OS=$MANU
				MANU=
			fi
		else
			# 2 tupple
			OS=$MANU
			MANU=
		fi
	fi
fi

echo "Configuring dhcpcd-ui 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 ICONDIR; 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

if [ -z "$CC" ]; then
	printf "Looking for compiler ... "
	for b in $TARGET- ""; do
		for cc in gcc pcc icc cc; 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

if [ -z "$CFLAGS" ]; then
	CFLAGS="-O2"
fi
echo "CFLAGS=		$CFLAGS" >>$CONFIG_MK
if [ -n "$CPPLAGS" ]; then
	echo "CPPLAGS=		$CPPLAGS" >>$CONFIG_MK
fi
for x in $INCLUDEDIR; do
	echo "CPPFLAGS+=	-I$x" >>$CONFIG_MK
done

if [ -n "$DEBUG" -a "$DEBUG" != no -a "$DEBUG" != false ]; then
	echo "Enabling memory debugging"
	echo "CPPFLAGS+=	-DDEBUG_MEMORY" >>$CONFIG_MK
elif [ -z "$DEBUG" -a -d .git ]; then
	printf "Found git ... "
	DEBUG=yes
	echo "LDADD+=		-Wl,-rpath=../libdhcpcd" >>$CONFIG_MK
else
	DEBUG=no
fi
if [ "$DEBUG" != no -a "$DEBUG" != false ]; then
	echo "Adding debugging CFLAGS"
	cat <<EOF >>$CONFIG_MK
CFLAGS+=	-Wall -Wextra -Wimplicit -Wshadow -Wformat=2
CFLAGS+=	-Wmissing-prototypes -Wmissing-declarations
CFLAGS+=	-Wmissing-noreturn -Wmissing-format-attribute
CFLAGS+=	-Wredundant-decls  -Wnested-externs
CFLAGS+=	-Winline -Wwrite-strings -Wcast-align -Wcast-qual
CFLAGS+=	-Wpointer-arith
CFLAGS+=	-Wdeclaration-after-statement -Wsequence-point
CFLAGS+=	-fno-common
EOF
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 "$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 [ "$STRLCPY" = no ]; then
	echo "#define strlcpy(dst, src, n) snprintf(dst, n, \"%s\", src)" \
	>>$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

# Get DBus CFLAGS
DBUS_CFLAGS=$(pkg-config --cflags dbus-1) || exit 1
DBUS_LIBS=$(pkg-config --libs dbus-1) || exit 1
echo "DBus CFLAGS=$DBUS_CFLAGS"
echo "DBus LIBS=$DBUS_LIBS"
echo "DBUS_CFLAGS=	$DBUS_CFLAGS" >>$CONFIG_MK
echo "DBUS_LIBS=	$DBUS_LIBS" >>$CONFIG_MK

UI=
if [ "$WITH_GTK" = yes -o -z "$WITH_GTK" ]; then
	PKG="dbus-1 gtk+-2.0"
	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

if [ -z "$UI" ]; then
	echo "no UI is available, not building." >&2
	exit 1
fi
echo "UI=		$UI" >>config.mk

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

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