# ----- define these variables
# CACHED_FILES     = $(TOPDIR)/VERSION
# CACHED_VARS      = VERSION
.PHONY: cache clean.cache

CACHED_FILES                ?= $(VERSION_FILE) $(wildcard $(TOPDIR)/make/project.conf)
CACHED_VARS                 ?= PROJECT PREREQ_BUILD PREREQ_RUN PREREQ VERSION HEX_VERSION \
				FULL_NAME WHICH PYTHON ECHO TEST BROWSER SED RM PWD ID CUT TR \
				AWK GETENT XARGS FIND PRINTF PLATFORM_INFO OS_NAME_VERSION \
				CAT BIN_INSTALL SUDO \
				JW_PKG_LD_LIBRARY_PATH JW_PKG_EXE_PATH JW_PKG_PYTHON_PATH

CACHED_VARS_ONLY_PROJECT    ?= \
	PROJECT \
	PREREQ_BUILD \
	PREREQ_RUN \
	PREREQ \
	VERSION \
	HEX_VERSION \
	FULL_NAME \
	JW_PKG_LD_LIBRARY_PATH \
	JW_PKG_EXE_PATH \
	JW_PKG_PYTHON_PATH

# We need this to cache JW_PKG_PYTHON_PATH
include $(JWBDIR)/make/py-path.mk

all: cache
clean: clean.cache
clean.cache:
	rm -f $(CACHE_PROJECT_MK)

cache: $(CACHE_PROJECT_MK)
$(CACHE_PROJECT_MK): $(CACHED_FILES) $(JWBDIR)/make/cache.mk
ifneq ($(wildcard $(CACHE_PROJECT_MK)),)
	rm -f $@
	make $@
else
	@echo 'ifneq ($$(JW_PKG_NO_CACHE),true)' | tee $@.tmp
	@echo $(foreach v,$(CACHED_VARS),$v = $(value $(v)) EOL) | \
		$(SED) 's/\s\+EOL/\n/g;' | \
		$(SED) 's/\s*\(\S\+\)\s*=\s*\(.*\)\s*/ifndef \1\n  \1 = \2\nendif\n/g;' | \
		$(SED) 's|$(realpath $(TOPDIR))|$$(TOPDIR)|g' | \
		$(SED) 's|$(realpath $(PROJECTS_DIR))|$$(PROJECTS_DIR)|g' | \
		$(GREP) . | \
		tee -a $@.tmp
	@echo 'endif # ifneq ($$(JW_PKG_NO_CACHE),true)' | tee -a $@.tmp
	mv $@.tmp $@
endif