DIST := dist
GO ?= go
SHASUM ?= shasum -a 256

ifneq ($(DRONE_TAG),)
	VERSION ?= $(subst v,,$(DRONE_TAG))
	LONG_VERSION ?= $(VERSION)
else
	ifneq ($(DRONE_BRANCH),)
		VERSION ?= $(subst release/v,,$(DRONE_BRANCH))
	else
		VERSION ?= master
	endif
	LONG_VERSION ?= $(shell git describe --tags --always | sed 's/-/+/' | sed 's/^v//')
endif

LDFLAGS := $(LDFLAGS) -X "main.Version=$(LONG_VERSION)"

.PHONY: build
build:
	$(GO) build -ldflags '-s -w $(LDFLAGS)'

.PHONY: lint
lint:
	@hash golangci-lint > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
		export BINARY="golangci-lint"; \
		curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.23.1; \
	fi
	golangci-lint run --timeout 5m

.PHONY: fmt
fmt:
	$(GO) fmt ./...

.PHONY: test
test:
	$(GO) test -race ./...

.PHONY: release
release: release-dirs check-xgo release-windows release-linux release-darwin release-copy release-compress release-check

.PHONY: check-xgo
check-xgo:
	@hash xgo > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
		$(GO) get -u src.techknowlogick.com/xgo; \
	fi

.PHONY: release-dirs
release-dirs:
	mkdir -p $(DIST)/binaries $(DIST)/release

.PHONY: release-windows
release-windows:
	xgo -dest $(DIST)/binaries -ldflags '-linkmode external -extldflags "-static" $(LDFLAGS)' -targets 'windows/*' -out gpm-$(VERSION) .
ifeq ($(CI),drone)
	cp /build/* $(DIST)/binaries
endif

.PHONY: release-linux
release-linux:
	xgo -dest $(DIST)/binaries -ldflags '-linkmode external -extldflags "-static" $(LDFLAGS)' -targets 'linux/amd64,linux/386,linux/arm-5,linux/arm-6,linux/arm64,linux/mips64le,linux/mips,linux/mipsle' -out gpm-$(VERSION) .
ifeq ($(CI),drone)
	cp /build/* $(DIST)/binaries
endif

.PHONY: release-darwin
release-darwin:
	xgo -dest $(DIST)/binaries -tags 'netgo osusergo $(TAGS)' -ldflags '$(LDFLAGS)' -targets 'darwin/*' -out gpm-$(VERSION) .
ifeq ($(CI),drone)
	cp /build/* $(DIST)/binaries
endif

.PHONY: release-copy
release-copy:
	cd $(DIST); for file in `find /build -type f -name "*"`; do cp $${file} ./release/; done;

.PHONY: release-check
release-check:
	cd $(DIST)/release/; for file in `find . -type f -name "*"`; do echo "checksumming $${file}" && $(SHASUM) `echo $${file} | sed 's/^..//'` > $${file}.sha256; done;

.PHONY: release-compress
release-compress:
	@hash gxz > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
		$(GO) get -u github.com/ulikunitz/xz/cmd/gxz; \
	fi
	cd $(DIST)/release/; for file in `find . -type f -name "*"`; do echo "compressing $${file}" && gxz -k -9 $${file}; done;