SHELL=/bin/bash

VARIABLES_AT_MAKEFILE_START := $(.VARIABLES)

TARGETS=build_config.inc

.PHONY: all

all: $(TARGETS)

########################################################################
# Variables to adjust at each new integrated project
########################################################################

PRODUCT_NAME=rasm
# URL set in git submodule

# You must set EXTRACT_DIR_NAME to match archive content.
EXTRACT_DIR_NAME=$(PRODUCT_NAME)

# If only one generated executable file, set BUILD_TARGET_FILE to path to it.
# It several generated executable files, do not set BUILD_TARGET_FILE.
BUILD_DIR=$(EXTRACT_DIR_NAME)
BUILD_TARGET_FILE=$(BUILD_DIR)/${PRODUCT_NAME}.exe

$(EXTRACT_DIR_NAME)/.unpacked:
	@echo "************************************************************************"
	@echo "**************** Extracting source from: $^"
	@echo "************************************************************************"
	git submodule update --init $(PRODUCT_NAME)
	touch $@
	@echo "************************************************************************"
	@echo "**************** Source extracted to: $(@D)"
	@echo "************************************************************************"

PATCHNAME=$(EXTRACT_DIR_NAME)_build_patch.patch

.PHONY: patch

patch: $(EXTRACT_DIR_NAME)/.patched

ifeq ($(wildcard $(PATCHNAME)),)
$(EXTRACT_DIR_NAME)/.patched: $(EXTRACT_DIR_NAME)/.unpacked
	@echo "************************************************************************"
	@echo "**************** No patch to apply to: $^"
	@echo "************************************************************************"
	touch $@
	@echo "************************************************************************"
	@echo "**************** Source patched in: $(@D)"
	@echo "************************************************************************"
else
$(EXTRACT_DIR_NAME)/.patched: $(PATCHNAME) $(EXTRACT_DIR_NAME)/.unpacked
	@echo "************************************************************************"
	@echo "**************** Patching source in: $^"
	@echo "************************************************************************"
	#patch -p0 < $< # No patch needed here
	touch $@
	@echo "************************************************************************"
	@echo "**************** Source patched in: $(@D)"
	@echo "************************************************************************"
endif

BUILD_TARGET_FILE?=$(EXTRACT_DIR_NAME)/$(PRODUCT_NAME).exe

$(BUILD_TARGET_FILE): $(EXTRACT_DIR_NAME)/.patched
	@echo "************************************************************************"
	@echo "**************** Configuring and build in: $^"
	@echo "************************************************************************"
	$(MAKE) -C "$(BUILD_DIR)" --print-directory
	touch "$@"
	@echo "************************************************************************"
	@echo "**************** Configured and built in: $(@D)"
	@echo "************************************************************************"

build_config.inc: bin/$(PRODUCT_NAME) Makefile
	(set -eu ; \
	{ \
	echo "# with bash do \"source\" this file." ; \
	cd "$(<D)" ; \
	echo "export PATH=\"\$${PATH}:$$PWD\"" ; \
	} >$@ ; )

.PHONY: run

run: bin/$(PRODUCT_NAME)
	$<

bin/$(PRODUCT_NAME): $(BUILD_TARGET_FILE)
	mkdir -p bin
	cp -avf $< $@

.PHONY: install

install: $(BUILD_TARGET_FILE)
	@ if [[ -z "$(PREFIX_BIN)" ]] ; then echo >&2 "PREFIX_BIN not set. Aborting." ; exit 1 ; fi
	@echo "************************************************************************"
	@echo "**************** Installing: $^"
	@echo "************************************************************************"
	cp -fv $(BUILD_TARGET_FILE) $(PREFIX_BIN)/$(PRODUCT_NAME)
	@echo "************************************************************************"
	@echo "**************** Configured and built in: $(@D)"
	@echo "************************************************************************"


clean:
	-$(MAKE) -C "$(BUILD_DIR)" clean
	-rm -f $(BUILD_TARGET_FILE)

mrproper:
	-rm -f $(BUILD_TARGET_FILE)
	-rm -f $(TARGETS)
	-rm -rf $(EXTRACT_DIR_NAME) ._$(EXTRACT_DIR_NAME) *~
	-rm -f $(PRODUCT_NAME)

distclean: mrproper


########################################################################
# Debug the makefile
########################################################################
$(foreach v,                                        \
  $(filter-out $(VARIABLES_AT_MAKEFILE_START) VARIABLES_AT_MAKEFILE_START,$(.VARIABLES)), \
  $(info $(v) = $($(v))))