CFGS=$(wildcard config/*.cfg.sh)
SRCS=$(wildcard common/*.cpp) $(wildcard linux/*.cpp)
TARGET=Blinker

CPP=g++
CONFIG=
DEFINE=-DBLINKER_CONFIG="\"$(CONFIG)\""
INCLUDE=-Icommon -Ilinux
CFLAGS=-Wall -Wextra -Werror -O2 -g2
LDFLAGS=
LIBS=-lBlinkenLib

CFGS_BASE=$(patsubst %.cfg.sh,%,$(CFGS))
CFGS_MK=$(addsuffix .cfg.mk,$(CFGS_BASE))
SRCS_BASE=$(patsubst %.cpp,%,$(SRCS))
DEPS=$(addsuffix .d,$(SRCS_BASE))
OBJS=$(addsuffix .o,$(SRCS_BASE))

.PHONY: all clean distclean
.SUFFIXES:
.SECONDARY:

all: $(TARGET)

ifneq ($(MAKECMDGOALS),clean)
  ifneq ($(MAKECMDGOALS),distclean)
    include config.mk
    include deps
  endif
endif

config.mk: $(CFGS_MK)
	cat /dev/null $^ >$@

%.cfg.mk: %.cfg.sh
	sh $< >$@

deps: $(DEPS)
	cat /dev/null $^ >$@

%.d: %.cpp Makefile config.mk
	$(CPP) $(DEFINE) $(INCLUDE) $(CFLAGS) -M -o $@ $<
	sed -i 1s!^!$(dir $<)! $@

%.o: %.cpp Makefile
	$(CPP) $(DEFINE) $(INCLUDE) $(CFLAGS) -c -o $@ $<

$(TARGET): $(OBJS)
	$(CPP) $(LDFLAGS) -o $@ $+ $(LIBS)

clean:
	rm -f deps $(DEPS) $(OBJS) $(TARGET)

distclean: clean
	rm -f config.mk $(CFGS_MK)