BASE_PKG = tacc-pkg.el
DEFINE_PACKAGE = $(shell sed 's/"/\\"/g' $(BASE_PKG))

NAME_SCRIPT = "(princ (cadr '$(DEFINE_PACKAGE)))"
VERSION_SCRIPT = "(princ (caddr '$(DEFINE_PACKAGE)))"
EMACS := $(shell command -v emacs 2> /dev/null)
ifndef EMACS
EMACS = $(error "emacs installation not found in PATH")
endif
EMACS_BATCH = $(EMACS) --batch --eval
NAME = $(shell $(EMACS_BATCH) $(NAME_SCRIPT))
MAIN_EL = $(NAME).el
VERSION = $(shell $(EMACS_BATCH) $(VERSION_SCRIPT))
QUALIFIED_NAME = $(NAME)-$(VERSION)
PACKAGE = $(QUALIFIED_NAME).tar
SUPPLEMENTAL = chime.wav tick.wav tags-history
SUPPLEMENTAL_NESTED = $(SUPPLEMENTAL:%=$(QUALIFIED_NAME)/%)

INSTALL_SCRIPT = "(package-install-file \"./$(PACKAGE)\")"
DELETE_SCRIPT = "(progn (package-initialize) (package-delete \"$(NAME)\"))"

all: $(PACKAGE)
.PHONY: all load-test install uninstall cleanup clean
.SILENT:

$(QUALIFIED_NAME):
	echo "Making package directory"
	mkdir $(QUALIFIED_NAME)

$(QUALIFIED_NAME)/$(MAIN_EL) $(QUALIFIED_NAME)/$(BASE_PKG) $(SUPPLEMENTAL_NESTED): $(QUALIFIED_NAME)/%: % $(QUALIFIED_NAME)
	cp -v $< $(QUALIFIED_NAME)

$(PACKAGE): $(SUPPLEMENTAL_NESTED) $(QUALIFIED_NAME)/$(BASE_PKG) $(QUALIFIED_NAME)/$(MAIN_EL)
	echo "Packing..."
	tar -cf $(PACKAGE) $(QUALIFIED_NAME)
	echo "Done. $(PACKAGE) is a portable emacs package"

load-test:
	echo "Checking script correctness"
	$(EMACS) -q -nw --script $(MAIN_EL)

install: $(PACKAGE)
	echo "Installing..."
	$(EMACS_BATCH) $(INSTALL_SCRIPT)
	echo "$(PACKAGE) installed."

# There's no good uninstall?
uninstall:
	echo "There is no good way to uninstall an emacs package from command line."
	echo "You need to run M-x package-delete $(NAME) from inside emacs."
	echo "Sorry :/"

# Cleanup gets rid intermediates and clutter, never the target
cleanup:
	rm -rfv $(QUALIFIED_NAME)
	rm -fv *~

# Clean leaves the source tree in it's base state
clean: cleanup
	rm -fv $(PACKAGE)