Makefile

MODULE   = $(shell $(GO) list -m)
DATE    ?= $(shell date +%FT%T%z)
VERSION ?= $(shell git describe --tags --always --dirty --match=v* 2> /dev/null || \
			cat .version 2> /dev/null || echo v0)
PKGS     = $(or $(PKG),$(shell $(GO) list ./...))
BIN      = bin

GO      = go
TIMEOUT = 15
V = 0
Q = $(if $(filter 1,$V),,@)
M = $(shell if [ "$$(tput colors 2> /dev/null || echo 0)" -ge 8 ]; then printf "\033[34;1m▶\033[0m"; else printf "▶"; fi)

.SUFFIXES:
.PHONY: all
all: fmt lint gen | $(BIN) ; $(info $(M) building executable…) @ ## Build program binary
	$Q $(GO) build \
		-tags release \
		-ldflags '-X main.Version=$(VERSION) -X main.BuildDate=$(DATE)' \
		-o $(BIN)/$(basename $(MODULE))

# Tools

$(BIN):
	@mkdir -p $@
$(BIN)/%: | $(BIN) ; $(info $(M) building $(PACKAGE)…)
	$Q env GOBIN=$(abspath $(BIN)) $(GO) install $(PACKAGE)

GOIMPORTS = $(BIN)/goimports
$(BIN)/goimports: PACKAGE=golang.org/x/tools/cmd/goimports@latest

REVIVE = $(BIN)/revive
$(BIN)/revive: PACKAGE=github.com/mgechev/revive@latest

.PHONY: lint
lint: | $(REVIVE) ; $(info $(M) running golint…) @ ## Run golint
	$Q $(REVIVE) -formatter friendly -set_exit_status ./...

.PHONY: fmt
fmt: | $(GOIMPORTS) ; $(info $(M) running gofmt…) @ ## Run gofmt on all source files
	$Q $(GOIMPORTS) -local $(MODULE) -w $(shell $(GO) list -f '{{$$d := .Dir}}{{range $$f := .GoFiles}}{{printf "%s/%s\n" $$d $$f}}{{end}}{{range $$f := .CgoFiles}}{{printf "%s/%s\n" $$d $$f}}{{end}}{{range $$f := .TestGoFiles}}{{printf "%s/%s\n" $$d $$f}}{{end}}' $(PKGS))

# Misc

.PHONY: clean
clean: ; $(info $(M) cleaning…)	@ ## Cleanup everything
	@rm -rf $(BIN) test $(GENERATED)

.PHONY: help
help:
	@grep -hE '^[ a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | \
		awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-17s\033[0m %s\n", $$1, $$2}'

.PHONY: version
version:
	@echo $(VERSION)

.PHONY: gen
gen: ; $(info $(M) generating roots file…) @ ## Generate roots file
	$Q $(GO) generate