DIRNAME    := $(patsubst %-src.tar.bz2,%,$(notdir $(SRCPATH)))
GNUTAR     ?= gtar
GNUSED     ?= gsed
HC_TARNAME ?= $(DIRNAME)-boot-$(PLATFORM).tar.bz2

all: work/pack-hc-pkg.stamp

work/extract-src.stamp:
	$(GNUTAR) -jxf $(SRCPATH) -C work
	touch $@

work/patch-src.stamp: work/extract-src.stamp
	@echo "Executing an inner shell."
	@echo "Apply some patches to the source tree if you want to, then exit."
	@echo "(pwd: `pwd`/$(DIRNAME))"
	@cd "work/$(DIRNAME)" && "$(SHELL)"
	touch $@

work/duplicate-target.stamp: work/patch-src.stamp
	cp -rp "work/$(DIRNAME)" "work/$(DIRNAME)-target"
	touch $@

work/rename-host.stamp: work/duplicate-target.stamp
	mv "work/$(DIRNAME)" "work/$(DIRNAME)-host"
	touch $@

work/$(DIRNAME)-target/Makefile: work/rename-host.stamp
	cd "work/$(DIRNAME)-target" && \
		./configure -C --enable-hc-boot
	touch $@

work/$(DIRNAME)-target/mk/build.mk: files/target-build.mk work/$(DIRNAME)-target/Makefile
	cp -f $< $@

work/build-boot-files.stamp: work/$(DIRNAME)-target/mk/build.mk
	$(MAKE) -C "work/$(DIRNAME)-target" bootstrapping-files
	touch $@

work/$(DIRNAME)-host/Makefile: work/build-boot-files.stamp
	cd "work/$(DIRNAME)-host" && \
		./configure \
			--with-iconv-includes=/usr/pkg/include \
			--with-iconv-libraries=/usr/pkg/lib
	touch $@

work/$(DIRNAME)-host/mk/build.mk: files/host-build.mk work/$(DIRNAME)-host/Makefile
	cp -f $< $@

work/copy-boot-files.stamp: work/$(DIRNAME)-host/mk/build.mk
	for i in dist-ghcconstants dist-derivedconstants ghcautoconf.h; do \
		rm -rf "work/$(DIRNAME)-host/includes/$$i" && \
		cp -pr \
			"work/$(DIRNAME)-target/includes/$$i" \
			"work/$(DIRNAME)-host/includes"; \
	done
	touch $@

work/build-hc.stamp: work/copy-boot-files.stamp
	$(MAKE) -C "work/$(DIRNAME)-host"
	touch $@

work/build-boot-tarball.stamp: work/build-hc.stamp
	cd "work/$(DIRNAME)-host" && ../../files/mkboot
	touch $@

work/extract-boot-tarball.stamp: work/build-boot-tarball.stamp
	mkdir -p "work/$(DIRNAME)"
	$(GNUTAR) -xf "work/$(DIRNAME)-host/boot.tar" -C "work/$(DIRNAME)"
	touch $@

work/replace-paths.stamp: work/extract-boot-tarball.stamp
	cd "work/$(DIRNAME)" && \
		$(GNUSED) -i \
			-e 's#/usr/pkg#[[PREFIX]]#g' \
			-e 's#'`pwd`'-host#[[GHC_SOURCE_PATH]]#g' \
			inplace/lib/package.conf.d/*.conf \
			*/package.conf.inplace \
			*/*/package-data.mk \
			*/*/*/package-data.mk \
			*/*/*/*/package-data.mk
	touch $@

work/pack-hc-pkg.stamp: work/replace-paths.stamp
	$(GNUTAR) -jcf "work/$(HC_TARNAME)" -C "work" $(DIRNAME)
	touch $@
	@echo "Done. Upload \"work/$(HC_TARNAME)\" to somewhere."