#!/bin/bash
 
# bmpanel configuration script
 
#----------------------------------------------------------------------------
# help message
#----------------------------------------------------------------------------
help() {
	echo "Options:"
	echo -e "  --help             print this help and exit"
	echo -e "  --prefix=PREFIX    specify install path [default=/usr]"
	echo -e "  --debug            enable debug mode"
	echo -e "  --mem-debug        become a memleak hunter"
	echo -e "  --optimize         extra optimizations"
	echo -e "  --ugly             enable ugly verbose mode"
	echo -e "  --with-ev          implement event loop with libev"
	echo -e "  --with-event       implement event loop with libevent"
	echo -e "  --with-composite   enable compositing mode (EXPERIMENTAL)"
}
 
TIMERFDMSG="\n***************************************************************************\nWARNING! Probably you have an old glibc library and/or an old linux kernel,\nyou need glibc >= 2.8 and the linux kernel >= 2.6.22 to compile this panel.\n***************************************************************************\n"
LIBEVMSG="\n***************************************************************************\nWARNING! You selected --with-ev options, but it looks like you have no\nlibev, please make sure that libev was installed in compiler-known place.\n***************************************************************************\n"
LIBEVENTMSG="\n***************************************************************************\nWARNING! You selected --with-event options, but it looks like you have no\nlibevent, please make sure that libevent was installed in compiler-known\nplace.\n***************************************************************************\n"
 
#----------------------------------------------------------------------------
# globals
#----------------------------------------------------------------------------
CFLAGS="-Wall"
LIBS=""
PACKAGES=""
 
#----------------------------------------------------------------------------
# helper functions
#----------------------------------------------------------------------------
append_libs_and_cflags() {
	CFLAGS="${CFLAGS} `pkg-config --cflags ${PACKAGES}`"
	LIBS="${LIBS} `pkg-config --libs ${PACKAGES}`"
}
 
check_header() {
	local HEADER=$1
	local MSG=$2
	echo -n "checking for $HEADER... "
 
	cat <<EOF > tmp.c && gcc tmp.c 2> /dev/null
#include <$1>
int main() { return 0; }
EOF
 
	RESULT=$?
	rm -rf tmp.c
	rm -rf a.out
 
	if [ $RESULT -ne 0 ]; then
		echo "no"
		if [[ -n $MSG ]]; then
			echo -e $MSG
		fi
		return
	fi
	echo "yes"
}
 
check_event_header() {
	local MSG=$1
	echo -n "checking for event.h... "
 
	cat <<EOF > tmp.c && gcc tmp.c 2> /dev/null
#include <sys/types.h>
#include <event.h>
int main() { return 0; }
EOF
 
	RESULT=$?
	rm -rf tmp.c
	rm -rf a.out
 
	if [ $RESULT -ne 0 ]; then
		echo "no"
		if [[ -n $MSG ]]; then
			echo -e $MSG
		fi
		return
	fi
	echo "yes"
}
 
check_pkg_version() {
	local PACKAGE=$1
	local VERSION=$2
	echo -n "checking for $PACKAGE >= $VERSION... "
	if ! (pkg-config --exists --atleast-version=${VERSION} ${PACKAGE}); then
		echo "no"
		exit 1
	fi
	echo "yes"
	PACKAGES="${PACKAGES} ${PACKAGE}" 
}
 
check_pkg() {
	local PACKAGE=$1
	echo -n "checking for $PACKAGE... "
	if ! (pkg-config --exists ${PACKAGE}); then
		echo "no"
		exit 1
	fi
	echo "yes"
	PACKAGES="${PACKAGES} ${PACKAGE}" 
}
 
yes_no() {
	local VAR=$1
	if [ $VAR -eq 1 ]; then
		echo "yes"
	else
		echo "no"
	fi
}
 
#----------------------------------------------------------------------------
# parse command line options
#----------------------------------------------------------------------------
PREFIX="/usr"
DEBUG=0
MEMDEBUG=0
OPTIMIZE=0
UGLY=0
WITH_EV=0
WITH_EVENT=0
WITH_COMPOSITE=0
 
while [ $# -gt 0 ]; do
	case $1 in
		--help)
			help
			exit 0
			;;
		--prefix=*)
			PREFIX=`echo $1 | sed 's/--prefix=//'`
			;;
		--debug)
			DEBUG=1
			;;
		--mem-debug)
			MEMDEBUG=1
			;;
		--optimize)
			OPTIMIZE=1
			;;
		--ugly)
			UGLY=1
			;;
		--with-ev)
			WITH_EV=1
			;;
		--with-event)
			WITH_EVENT=1
			;;
		--with-composite)
			WITH_COMPOSITE=1
			;;
		*)
			echo "unknown option $1"
			help
			exit 1
			;;
	esac
	shift
done
 
#----------------------------------------------------------------------------
# general flow
#----------------------------------------------------------------------------
echo "checking for installed devel packages"
if [ $WITH_EV -eq 1 ]; then
	check_header ev.h "$LIBEVMSG"
elif [ $WITH_EVENT -eq 1 ]; then
	check_event_header "$LIBEVENTMSG"
else
	check_header sys/timerfd.h "$TIMERFDMSG"
fi
check_pkg_version imlib2 1.4.0
check_pkg x11
 
if [ $WITH_COMPOSITE -eq 1 ]; then
	check_pkg xrender
	check_pkg xcomposite
	CFLAGS="$CFLAGS -DWITH_COMPOSITE"
fi
 
check_pkg fontconfig
append_libs_and_cflags
 
if [ $MEMDEBUG -eq 1 ]; then
	CFLAGS="$CFLAGS -DMEMDEBUG"
fi
 
 
if [ $WITH_EV -eq 1 ]; then
	CFLAGS="$CFLAGS -DWITH_EV"
	LIBS="$LIBS -lev"
elif [ $WITH_EVENT -eq 1 ]; then
	CFLAGS="$CFLAGS -DWITH_EVENT"
	LIBS="$LIBS -levent"
fi
 
if [ $DEBUG -eq 1 ]; then
	CFLAGS="$CFLAGS -g -O0 -DLOG_ASSERT_ENABLED -DDEBUG"
else
	if [ $OPTIMIZE -eq 1 ]; then
		CFLAGS="$CFLAGS -O2 -march=native"
	fi
fi
 
CFLAGS="$CFLAGS -DPREFIX=\\\\\\\"$PREFIX\\\\\\\""
 
CFLAGS=`echo $CFLAGS | xargs`
LIBS=`echo $LIBS | xargs`
 
echo ""
echo "---------- summary ----------"
echo "  CFLAGS : $CFLAGS"
echo "    LIBS : $LIBS"
echo "  PREFIX : $PREFIX"
echo -n "   DEBUG : "; yes_no $DEBUG
echo -n "MEMDEBUG : "; yes_no $MEMDEBUG
echo -n "OPTIMIZE : "; yes_no $OPTIMIZE
echo -n "    UGLY : "; yes_no $UGLY
echo "-----------------------------"
echo ""
 
echo "writing .mk/config.mk..."
mkdir -p .mk
echo "PREFIX:=$PREFIX" > .mk/config.mk
echo "UGLY:=$UGLY" >> .mk/config.mk
echo "DEBUG:=$DEBUG" >> .mk/config.mk
echo "CFLAGS+=$CFLAGS" >> .mk/config.mk
echo "LIBS+=$LIBS" >> .mk/config.mk
echo "configure done"