#!/bin/sh
# $Id$
# vim: syntax=sh
PKG_NAME="@PKG_NAME@"
EXPORTS="CC AR CFLAGS LDFLAGS LIBS"

PREFIX="/usr/local"
SKIP=0
HAVE=""

for i in $@; do
	case "$i" in
		--prefix=*)
			PREFIX="`echo "$i" | sed "s/--prefix=//g"`"
			;;
	esac
done

echo "Configuring $PKG_NAME"

. ./config

for i in $EXPORTS; do
	if [ "x`eval echo \\\$$i`" = "x" ]; then
		eval $i=""
	fi
	export $i
done

if [ "x$PKGCONF" = "x" ]; then
	for i in pkg-config; do
		FOUND=no
		( $i --version >/dev/null 2>/dev/null ) && FOUND=yes
		if [ "$FOUND" = "yes" ]; then
			echo "Found working pkg-config: $i"
			PKGCONF="$i"
		fi
		if [ ! "x$PKGCONF" = "x" ]; then
			break
		fi
	done
else
	echo "Using user-provided pkg-config: $PKGCONF"
fi

if [ "x$PKGCONF" = "x" ]; then
	echo "pkg-config not found, will not use it"
fi

if [ "x$CC" = "x" ]; then
	for i in gcc clang cc; do
		FOUND=no
		( echo "int main(){return 0;}" | $i -x c -o /dev/null - >/dev/null 2>/dev/null ) && FOUND=yes
		if [ "$FOUND" = "yes" ]; then
			echo "Found working C compiler: $i"
			CC="$i"
		fi
		if [ ! "x$CC" = "x" ]; then
			break
		fi
	done
else
	echo "Using user-provided C compiler: $CC"
fi

if [ "x$CC" = "x" ]; then
	echo "C compiler not found"
	exit 1
fi

if [ "x$AR" = "x" ]; then
	for i in gar ar; do
		FOUND=no
		( $i --version >/dev/null 2>&1 ) && FOUND=yes
		if [ "$FOUND" = "yes" ]; then
			echo "Found working archiver: $i"
			AR="$i"
		fi
		if [ ! "x$AR" = "x" ]; then
			break
		fi
	done
else
	echo "Using user-provided archiver: $AR"
fi

if [ "x$AR" = "x" ]; then
	echo "Archiver not found"
	exit 1
fi

if [ "x$RANLIB" = "x" ]; then
	for i in granlib ranlib; do
		FOUND=no
		( $i --version >/dev/null 2>&1 ) && FOUND=yes
		if [ "$FOUND" = "yes" ]; then
			echo "Found working ranlib: $i"
			RANLIB="$i"
		fi
		if [ ! "x$RANLIB" = "x" ]; then
			break
		fi
	done
else
	echo "Using user-provided ranlib: $RANLIB"
fi

if [ "x$RANLIB" = "x" ]; then
	echo "Ranlib not found"
	exit 1
fi

CFLAGS="$CFLAGS -fPIC"

if [ ! "x$PKGCONF" = "x" ]; then
	for i in $TRY_PKGCONF; do
		CFLAGS="$CFLAGS `$PKGCONF --cflags $i`"
		LIBS="$LIBS `$PKGCONF --libs $i`"
	done
fi

if [ "$SKIP" = "0" ]; then
	for i in $REQUIRED_HEADERS; do
		FOUND=no
		echo -n "Checking if header $i exists... "
		( printf "#include <$i>\nint main(){return 0;}" | $CC -c $CFLAGS -x c -o /dev/null - >/dev/null 2>/dev/null ) && FOUND=yes
		if [ "$FOUND" = "yes" ]; then
			echo "yes"
		else
			echo "no"
			if [ "$OPTIONAL" = "1" ]; then
				SKIP=1
				echo "This is optional package, simply not building"
				break
			else
				echo "Cannot continue"
				exit 1
			fi
		fi
	done
fi

if [ "$SKIP" = "0" ]; then
	for i in $REQUIRED_LIBS; do
		FOUND=no
		echo -n "Checking if library $i exists... "
		( printf "int main(){return 0;}" | $CC $CFLAGS $LDFLAGS -x c -o /dev/null - -l$i >/dev/null 2>/dev/null ) && FOUND=yes
		if [ "$FOUND" = "yes" ]; then
			echo "yes"
			LIBS="$LIBS -l$i"
		else
			echo "no"
			if [ "$OPTIONAL" = "1" ]; then
				SKIP=1
				echo "This is optional package, simply not building"
				break
			else
				echo "Cannot continue"
				exit 1
			fi
		fi
	done
fi

if [ "$SKIP" = "0" ]; then
	for i in $OPTIONAL_FUNCTIONS; do
		FOUND=no
		HEADER="`echo $i | sed 's/.*@//g'`"
		SYMBOL="`echo $i | sed 's/@.*//g'`"
		DEF=0
		echo -n "Checking if $SYMBOL exists in $HEADER... "
		( printf "#include <$HEADER>\nint main(){void* sym = $SYMBOL;return 0;}" | $CC -c $CFLAGS -Werror -x c -o /dev/null - >/dev/null 2>/dev/null ) && FOUND=yes
		if [ "$FOUND" = "yes" ]; then
			echo "yes"
			DEF=1
		else
			echo "no"
		fi
		HAVE="$HAVE HAVE_`echo $HEADER | sed 's%\.%_%g' | sed 's%/%_%g' | tr "[a-z]" "[A-Z]"`__`echo $SYMBOL | sed 's%/%_%g' | tr "[a-z]" "[A-Z]"`=$DEF"
	done
fi

if [ "$SKIP" = "0" ]; then
	for i in $OPTIONAL_VALUES; do
		FOUND=no
		HEADER="`echo $i | sed 's/.*@//g'`"
		SYMBOL="`echo $i | sed 's/@.*//g'`"
		DEF=0
		echo -n "Checking if $SYMBOL exists in $HEADER... "
		( printf "#include <$HEADER>\nint main(){(void)$SYMBOL;return 0;}" | $CC -c $CFLAGS -Werror -x c -o /dev/null - >/dev/null 2>/dev/null ) && FOUND=yes
		if [ "$FOUND" = "yes" ]; then
			echo "yes"
			DEF=1
		else
			echo "no"
		fi
		HAVE="$HAVE HAVE_`echo $HEADER | sed 's%\.%_%g' | sed 's%/%_%g' | tr "[a-z]" "[A-Z]"`__`echo $SYMBOL | sed 's%/%_%g' | tr "[a-z]" "[A-Z]"`=$DEF"
	done
fi

if [ "$SKIP" = "0" ]; then
	for i in $OPTIONAL_LIBS; do
		FOUND=no
		echo -n "Checking if library $i exists... "
		( printf "int main(){return 0;}" | $CC $CFLAGS $LDFLAGS -Werror -x c -o /dev/null - -l$i >/dev/null 2>/dev/null ) && FOUND=yes
		if [ "$FOUND" = "yes" ]; then
			echo "yes"
			LIBS="$LIBS -l$i"
		else
			echo "no"
		fi
	done
fi

if [ "$SKIP" = "0" ]; then
	echo "Generating config.h"
	echo "#ifndef __CONFIG_H__" > config.h
	echo "#define __CONFIG_H__" >> config.h
	for i in $HAVE; do
		echo "#define `echo $i | sed "s/=/ /g"`" >> config.h
	done
	echo "#endif" >> config.h
fi

echo "Generating Makefile"
echo "# This file was auto-generated" > Makefile
echo "CC=$CC" >> Makefile
echo "AR=$AR" >> Makefile
echo "RANLIB=$RANLIB" >> Makefile
echo "CFLAGS=$CFLAGS" >> Makefile
echo "LDFLAGS=$LDFLAGS" >> Makefile
echo "LIBS=$LIBS" >> Makefile
echo >> Makefile
echo ".SUFFIXES: .c .o" >> Makefile
echo ".PHONY: all clean install" >> Makefile
echo "all: $TARGET" >> Makefile
echo >> Makefile
echo "clean:" >> Makefile
echo "	rm -f *.o *.so $TARGET" >> Makefile
echo >> Makefile
echo "$TARGET: $OBJS" >> Makefile
if [ "$SKIP" = "1" ]; then
	echo "	@echo Not building" >> Makefile
elif [ "$TYPE" = "static" ]; then
	echo "	\$(AR) rc $TARGET $OBJS" >> Makefile
	echo "	\$(RANLIB) $TARGET" >> Makefile
elif [ "$TYPE" = "exec" ]; then
	echo "	\$(CC) \$(LDFLAGS) -o $TARGET $OBJS \$(LIBS)" >> Makefile
elif [ "$TYPE" = "shared" -o "$TYPE" = "driver" ]; then
	echo "	\$(CC) \$(LDFLAGS) -shared -o $TARGET $OBJS \$(LIBS)" >> Makefile
fi
echo >> Makefile
echo "install: all" >> Makefile
if [ "$SKIP" = "1" ]; then
	echo "	@echo Not installing" >> Makefile
elif [ "$TYPE" = "static" ]; then
	:
elif [ "$TYPE" = "exec" ]; then
	echo "	mkdir -p $PREFIX/bin" >> Makefile
	echo "	cp $TARGET $PREFIX/bin/$TARGET" >> Makefile
elif [ "$TYPE" = "driver" ]; then
	echo "	mkdir -p $PREFIX/lib/multiview" >> Makefile
	echo "	cp $TARGET $PREFIX/lib/multiview/$TARGET" >> Makefile
elif [ "$TYPE" = "shared" ]; then
	echo "	mkdir -p $PREFIX/lib" >> Makefile
	echo "	cp $TARGET $PREFIX/lib/$TARGET" >> Makefile
fi
echo >> Makefile
echo ".c.o:" >> Makefile
echo "	\$(CC) \$(CFLAGS) -c -o \$@ \$<" >> Makefile