.PHONY: help build extract

TMUX   := https://github.com/tmux/tmux.git
LATEST  = $(shell git ls-remote --tags $(TMUX) \
					      | egrep 'refs/tags/[0-9]+(\.[0-9]+)+[a-z]*$$' \
								| tail -1 | cut -d/ -f3)

IMAGE   = tmux:$(LATEST)

help: ## Display this help message
	@echo "Latest: $(LATEST)"
	@echo "Usage:"
	@sed -nE "s/^([^:]+):\s+##\s+(.+)$$/\tmake \\1\t- \\2/p" \
		$(lastword $(MAKEFILE_LIST))

build: ## Build tmux in a docker image
	docker build \
		--build-arg VERSION=$(LATEST) \
		--tag $(IMAGE) \
		--rm .

extract: ## Extract the binaries from the docker image
	docker run \
		-ti --rm \
		-u $(shell id -u):$(shell id -g) \
		-v $(CURDIR):/mnt/cwd \
		-w /usr/local/lib \
		$(IMAGE) tar czf /mnt/cwd/tmux_v$(LATEST).tar.gz tmux_v$(LATEST)