PATHS := ${shell echo */ | grep -v "*/"}
OBJ := ${subst cpp,o,${shell echo *.cpp | grep -v "*.cpp"}}

.PHONY: build
build : $(PATHS)
   @echo ═════════════════════════════════════════
   @echo [*] Linking 
   @echo ═════════════════════════════════════════
   mkdir -p build
   -mv ${shell find src -type f -name "*.o"} build
   $(CXX) $(CXXFLAGS) ${shell echo build/*.o} -lSDL2 -lSDL2_image -o NewSuperTux

.PHONY: subdirectory
subdirectory : $(PATHS) $(OBJ)
   rm makefile
   @echo ------- Finished $*/ -------

.PHONY: clean
clean :
   @echo ═════════════════════════════════════════
   @echo [*] Cleaning up 
   @echo ═════════════════════════════════════════
   rm -rf build

%/ :
   @echo ═════════════════════════════════════════
   @echo [!] Entering subdirectory $*/
   @echo ═════════════════════════════════════════
   cp makefile $*/
   cd $* && make subdirectory

%.o : %.cpp
   @echo ═════════════════════════════════════════
   @echo [*] Compiling $^
   @echo ═════════════════════════════════════════
   $(CXX) $(CXXFLAGS) -c $^

.PHONY: FORCE

%/ : FORCE
    boom