BIN 	:= "nexclamation"
SYMLINK	:= "n!"
COMPL	:= "completion"
PREF	:= "./.installation_prefix"

all:
	@echo Nothing to do. Available targets: install, uninstall, set-prefix
	@echo
	@echo Deafult PREFIX for root user: /usr/local
	@echo Deafult PREFIX for non-root user: ~/.local
	@echo Set up custom installation PREFIX by:
	@echo make PREFIX=/your/path install

install: set-prefix
	$(eval PREFIX := $(shell cat $(PREF)))
	@echo Installation PREFIX $(PREFIX)
	COMPDIR="$(PREFIX)/share/bash-completion/completions"; \
	mkdir -p "$(PREFIX)" && \
	mkdir -p "$$COMPDIR" && \
	cp "$(BIN)" "$(PREFIX)/bin/$(BIN)" && \
	ln -s "$(PREFIX)/bin/$(BIN)" "$(PREFIX)/bin/$(SYMLINK)" && \
	cp "$(COMPL)" "$$COMPDIR/$(BIN)"
	@echo Successfully installed

uninstall:
	$(eval PREFIX := $(shell cat $(PREF)))
	@echo Installation PREFIX $(PREFIX)
	COMPDIR="$(PREFIX)/share/bash-completion/completions"; \
	rm -f "$(PREFIX)/bin/$(BIN)" && \
	rm -f "$(PREFIX)/bin/$(SYMLINK)" && \
	rm -f "$$COMPDIR/$(BIN)"
	@echo Successfully uninstalled

set-prefix:
	if [ "$$UID" == "0" ]; then \
	echo $${PREFIX:-/usr/local} > $(PREF); else \
	echo $${PREFIX:-$$HOME/.local} > $(PREF); fi;