COMMIT:=$(shell test -d .git && (git show 2>/dev/null | head -1 | cut -d' ' -f 2) || cat .tarball-version)
TARBALL_DIR:=$(PACKAGE)-$(VERSION)
TARBALL:=$(OUT)/$(TARBALL_DIR).tar.gz

OPT_CLEAN:=$(OPT_CLEAN) $(TARBALL) .tarball-version

GIT_ARCHIVE_HEAD:=git archive HEAD --
GIT_LS_FILES:=git ls-files
ifeq ($(wildcard .git),)
GIT_ARCHIVE_HEAD:=tar -cf-
GIT_LS_FILES:=find
endif

.tarball-version:
	echo $(COMMIT) > $@

dist: $(TARBALL)

tree-clean-p:
	test ! -d .git || git diff --exit-code > /dev/null
	test ! -d .git || git diff --cached --exit-code > /dev/null
	@echo commit:$(COMMIT)

$(TARBALL): tree-clean-p .tarball-version ChangeLog
	mkdir -p $(OUT)
	($(GIT_LS_FILES) --exclude=$(OUT);\
		echo $^ | tr ' ' '\n' | grep -Ev 'tree-clean-p')\
		| tar --transform=s,^,$(TARBALL_DIR)/,S -T- -czf $@

ChangeLog: tree-clean-p
	build-aux/gitlog-to-changelog > $@

install:
	mkdir -p  $(DESTDIR)$(PREFIX)/bin
	install mes $(DESTDIR)$(PREFIX)/bin/mes
	install scripts/elf.mes $(DESTDIR)$(PREFIX)/bin/elf.mes
	install scripts/mescc.mes $(DESTDIR)$(PREFIX)/bin/mescc.mes
	install scripts/repl.mes $(DESTDIR)$(PREFIX)/bin/repl.mes
	install scripts/paren.mes $(DESTDIR)$(PREFIX)/bin/paren.mes
	mkdir -p $(DESTDIR)$(PREFIX)/share/mes
	$(GIT_ARCHIVE_HEAD) module\
		| tar -C $(DESTDIR)$(PREFIX)/share/mes -xf-

release: tree-clean-p check dist
	git tag v$(VERSION)
	git push --tags origin master
	git push origin master