BINNAME = gomonop
BINDIR = $(CURDIR)/bin
TARGETS = linux/amd64 linux/386 linux/arm linux/arm64

SRC := $(shell find . -type f -name '*.go' -print) go.mod go.sum
GOHOSTOS = $(shell go env GOHOSTOS)
GOHOSTARCH ?= $(shell go env GOHOSTARCH)

GIT_TAG    = $(shell git describe --tags --abbrev=0 --exact-match 2>/dev/null)
GIT_COMMIT = $(shell git rev-parse --short HEAD 2>/dev/null)
GIT_STATUS = $(shell test -n "`git status --porcelain`" && echo "dirty" || echo "clean")

ifneq ($(VERSION),)
	BINARY_VERSION = $(VERSION)
endif
BINARY_VERSION ?= $(GIT_TAG)

LDFLAGS += -w -s
ifneq ($(BINARY_VERSION),)
	LDFLAGS += -X nocternity.net/gomonop/pkg/version.version=${BINARY_VERSION}
endif
LDFLAGS += -X nocternity.net/gomonop/pkg/version.commit=${GIT_COMMIT}
LDFLAGS += -X nocternity.net/gomonop/pkg/version.status=${GIT_STATUS}


.PHONY: all
all: build

.PHONY: build
build: GOOS=$(GOHOSTOS)
build: GOARCH=$(GOHOSTARCH)
build: build-target symlink

.PHONY: symlink
symlink:
	@ln -sf $(BINDIR)/$(GOOS)-$(GOARCH)/$(BINNAME) $(BINDIR)/$(BINNAME)

.PHONY: build-target
build-target: LDFLAGS += -X nocternity.net/gomonop/pkg/version.target=${GOOS}/${GOARCH}
build-target: $(BINDIR)/$(GOOS)-$(GOARCH)/$(BINNAME)

$(BINDIR)/$(GOOS)-$(GOARCH)/$(BINNAME): $(SRC)
	@mkdir -p $(BINDIR)/$(GOOS)-$(GOARCH)
	@CGO_ENABLED=0 go build -ldflags "$(LDFLAGS)" -o $(BINDIR)/$(GOOS)-$(GOARCH)/$(BINNAME) .

.PHONY: test
test: build
	@go test -v ./...

.PHONY: build-cross
build-cross:
	@for target in $(TARGETS); do \
		$(MAKE) build-target GOOS=`echo $$target | cut -d / -f 1` GOARCH=`echo $$target | cut -d / -f 2`; \
	done

.PHONY: clean
clean:
	@rm -rf $(BINDIR)