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#! /bin/sh

set -e

default_prefix=/usr/local
prefix=$default_prefix
default_CC='c99'
# FILE_OFFSET_BITS=64 is required for large file support on 32-bit platforms.
default_CFLAGS='-O1 -Wall -MD'
default_LDFLAGS=""

CC=${CC:-$default_CC}

help()
{
	cat <<-EOF
$0 [OPTION ...]

--prefix      Set installation directory [$default_prefix]

Some influential environment variables:
  CC                  C compiler [$default_CC]
  CFLAGS              C compiler flags [$default_CFLAGS]
  LDFLAGS             Link-time flags [$default_LDFLAGS]
EOF
}

while true; do
	split_arg=0

	if printf "%s" "$1" | grep -e '=' > /dev/null
	then
		key="$(printf "%s" "$1" | cut -d '=' -f1)"
		value="$(printf "%s" "$1" | cut -d '=' -f2)"
		split_arg=1
	else
		key="$1"
		value="$2"
	fi

	case "$key" in
		--prefix ) prefix="$value"; shift; test $split_arg -eq 0 && shift ;;
		-h | --help ) help; exit 0 ;;
		* ) test "$1" != "" && help && exit 1 || break ;;
	esac
done

if pkg-config sqlite3
then
	proj_CFLAGS="$proj_CFLAGS $(pkg-config --cflags sqlite3)"
	proj_LDFLAGS="$proj_LDFLAGS $(pkg-config --libs sqlite3)"
	tk_LDFLAGS="$tk_LDFLAGS $(pkg-config --libs sqlite3)"
else
	echo "Error: sqlite3 not found" >&2
	exit 1
fi

if pkg-config libcjson
then
	proj_CFLAGS="$proj_CFLAGS $(pkg-config --cflags libcjson)"
	proj_LDFLAGS="$proj_LDFLAGS $(pkg-config --libs libcjson)"
	tk_LDFLAGS="$tk_LDFLAGS $(pkg-config --libs libcjson)"
else
	echo "Error: libcjson not found." >&2
	exit 1
fi

if pkg-config libsodium
then
	proj_CFLAGS="$proj_CFLAGS $(pkg-config --cflags libsodium)"
	proj_LDFLAGS="$proj_LDFLAGS $(pkg-config --libs libsodium)"
	tk_LDFLAGS="$tk_LDFLAGS $(pkg-config --libs libsodium)"
else
	echo "Error: libsodium not found" >&2
	exit 1
fi

if pkg-config dynstr
then
	in_tree_dynstr=0
	proj_CFLAGS="$proj_CFLAGS $(pkg-config --cflags dynstr)"
	proj_LDFLAGS="$proj_LDFLAGS $(pkg-config --libs dynstr)"
	tk_LDFLAGS="$tk_LDFLAGS $(pkg-config --libs dynstr)"
else
	echo "Info: dynstr not found. Using in-tree copy" >&2
	in_tree_dynstr=1
	proj_CFLAGS="$proj_CFLAGS -Ilibweb/dynstr/include"
	proj_LDFLAGS="$proj_LDFLAGS -Llibweb/dynstr -ldynstr"
	tk_LDFLAGS="$tk_LDFLAGS -Llibweb/dynstr -ldynstr"
fi

if pkg-config libweb
then
	in_tree_libweb=0
	proj_CFLAGS="$proj_CFLAGS $(pkg-config --cflags libweb)"
	proj_LDFLAGS="$proj_LDFLAGS $(pkg-config --libs libweb)"
else
	echo "Info: libweb not found. Using in-tree copy" >&2
	in_tree_libweb=1
	proj_CFLAGS="$proj_CFLAGS -Ilibweb/include"
	proj_LDFLAGS="$proj_LDFLAGS -Llibweb -lweb"

	if [ -f libweb/Makefile ]
	then
		echo "Info: Re-configuring libweb" >&2
		(cd libweb && CFLAGS="$CFLAGS" LDFLAGS="$LDFLAGS" ./configure \
			--prefix="$prefix")
	fi
fi

proj_CFLAGS="$proj_CFLAGS $default_CFLAGS $CFLAGS"
proj_LDFLAGS="$proj_LDFLAGS $default_LDFLAGS $LDFLAGS"
tk_LDFLAGS="$tk_LDFLAGS $LDFLAGS"

cleanup()
{
	rm -f $F
}

F=/tmp/Makefile.nanobbs
trap cleanup EXIT

cat <<EOF > $F
.POSIX:

CC = $CC
PREFIX = $prefix
DST = $prefix/bin
CFLAGS = $CFLAGS
LDFLAGS = $LDFLAGS
PROJ_CFLAGS = $proj_CFLAGS
PROJ_LDFLAGS = $proj_LDFLAGS
TK_LDFLAGS = $tk_LDFLAGS
EOF

cat <<"EOF" >> $F
PROJECT = nanobbs
DEPS = $(OBJECTS:.o=.d)
OBJECTS = \
	auth.o \
	astrftime.o \
	db.o \
	db_post.o \
	db_section.o \
	db_topic.o \
	default_prv_policy.o \
	default_style.o \
	default_terms.o \
	ep_create.o \
	ep_index.o \
	ep_login.o \
	ep_logout.o \
	ep_passwd.o \
	ep_signup.o \
	ep_style.o \
	ep_ucp.o \
	ep_view.o \
	form_badreq.o \
	form_category.o \
	form_footer.o \
	form_head.o \
	form_login.o \
	form_post.o \
	form_section.o \
	form_shortpwd.o \
	form_topic.o \
	form_unauthorized.o \
	gencookie.o \
	getul.o \
	getul_n.o \
	jwt.o \
	login_get.o \
	main.o \
	op.o \
	sanitize.o

TK_OBJECTS = \
	jwt.o \
	tokengen.o

all: $(PROJECT) tokengen

.c.o:
	$(CC) $(PROJ_CFLAGS) -c $< -o $@

install: all
	mkdir -p $(DST)
	install nanobbs tokengen $(DST)
	+cd doc && $(MAKE) PREFIX=$(PREFIX) install

FORCE:
$(PROJECT): $(OBJECTS)
	$(CC) $(OBJECTS) $(PROJ_LDFLAGS) -o $@

tokengen: $(TK_OBJECTS)
	$(CC) $(TK_OBJECTS) $(TK_LDFLAGS) -o $@
EOF

if [ $in_tree_dynstr -ne 0 ]
then
cat <<"EOF" >> $F
DYNSTR = libweb/dynstr/libdynstr.a
$(PROJECT) tokengen: $(DYNSTR)
$(DYNSTR): FORCE
	+cd libweb/dynstr && $(MAKE) CC=$(CC)
EOF
fi

if [ $in_tree_libweb -ne 0 ]
then
cat <<"EOF" >> $F
LIBWEB_MK = libweb/Makefile
$(LIBWEB_MK):
	cd libweb && CFLAGS="$(CFLAGS)" LDFLAGS="$(LDFLAGS)" \
		./configure --prefix=$(PREFIX)
LIBWEB = libweb/libweb.a
$(PROJECT): $(LIBWEB)
$(LIBWEB): $(LIBWEB_MK) FORCE
	+cd libweb && $(MAKE) CC=$(CC)
libweb: $(LIBWEB)
EOF
fi

cat <<"EOF" >> $F
clean:
	rm -f $(OBJECTS) $(TK_OBJECTS) $(DEPS)
EOF

if [ $in_tree_dynstr -ne 0 ]
then
cat <<"EOF" >> $F
	+cd libweb/dynstr && $(MAKE) clean
EOF
fi

if [ $in_tree_libweb -ne 0 ]
then
cat <<"EOF" >> $F
	+test -f $(LIBWEB_MK) && cd libweb && $(MAKE) clean || :
EOF
fi

cat <<"EOF" >> $F
distclean: clean
	rm -f nanobbs tokengen
	rm Makefile
EOF

# dynstr has no distclean target as of the time of this writing.

if [ $in_tree_libweb -ne 0 ]
then
cat <<"EOF" >> $F
	+test -f $(LIBWEB_MK) && cd libweb && $(MAKE) distclean || :
EOF
fi

cat <<"EOF" >> $F
-include $(DEPS)
EOF

mv $F Makefile