VERSION=$(shell git describe --tags --always --dirty)\:$(shell date +'%Y%m%d')

SRC_DIR := src
BUILD_DIR := build
OUT_DIR := lib

ifeq ($(LUA_VERSION),)
	LUA_VERSION := 5.1
endif

ifeq ($(PREFIX),)
	PREFIX := /usr/local/lib/lua/$(LUA_VERSION)/lutango
endif

LUT_INCLUDE := $(SRC_DIR)

SRCS := $(shell find . -name '*.cpp')
OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
SONAME := core.so.$(VERSION)
SOLINK := core.so

CC = g++
CXX = $(CC)

CFLAGS = -shared -fpic -D_REENTRANT -DVERSION=\"$(VERSION)\" -I$(LUT_INCLUDE) -Wl,--no-undefined
CFLAGS += $(shell pkg-config --cflags tango lua$(LUA_VERSION))
LDFLAGS = $(shell pkg-config --libs tango lua$(LUA_VERSION))
CPPFLAGS += $(CFLAGS)

dir-guard=@mkdir -p $(@D)

.PHONY: default clean install

default: $(OUT_DIR)/$(SONAME)

$(OUT_DIR)/$(SONAME): $(OBJS)
	$(dir-guard)
	$(CXX) $^ $(CPPFLAGS) $(LDFLAGS) -o $@

$(BUILD_DIR)/%.cpp.o: %.cpp
	$(dir-guard)
	$(CXX) $(CPPFLAGS) -c $< -o $@

clean:
	rm -rf build
	rm -rf lib

install:
	install -d $(PREFIX)
	install -m 644 $(SRC_DIR)/*.lua $(PREFIX)
	install -s -m 644 $(OUT_DIR)/$(SONAME) $(PREFIX)
	ln -sf $(PREFIX)/$(SONAME) $(PREFIX)/$(SOLINK)