build: Add Makefile

Makefile

@@ -0,0 +1,71 @@
+
+PKG ?= .
+APP := gitlab-exporter
+
+.PHONY: fmt
+fmt: ## Format source code
+	go fmt ${PKG}/...
+
+.PHONY: lint
+lint: ## Run set of static code analysis tools
+	golangci-lint run ${PKG}/...
+
+.PHONY: vet
+vet: ## Examine code for suspicious constructs
+	go vet ${PKG}/...
+
+.PHONY: graphql
+graphql: ## Generate the GitLab GraphQL API client code
+	genqlient internal/gitlab/graphql/genqlient.yaml
+
+.PHONY: protobuf
+protobuf:  ## Generate Protocol Buffer and gRPC code
+	protoc \
+		-I protos/ \
+		-I protos/vendor/opentelemetry-proto \
+		--go_out=. --go_opt=module=github.com/cluttrdev/gitlab-exporter \
+		--go-grpc_out=. --go-grpc_opt=module=github.com/cluttrdev/gitlab-exporter \
+		protos/gitlabexporter/protobuf/*.proto protos/gitlabexporter/protobuf/service/*.proto
+
+.PHONY: build
+build:  ## Create application binary
+	export output="bin/${APP}"; \
+	if [ -n "${output}" ]; then export output="${output}"; fi; \
+	export version=$$(make --no-print-directory version); \
+	go build \
+		-ldflags "-s -w -X 'main.version=$${version}'" \
+		-o "$${output}" \
+		${PKG}
+
+.PHONY: build-image
+build-image: ## Build container image
+	export version=$$(make --no-print-directory version); \
+	docker build \
+		--file Dockerfile \
+		--build-arg VERSION=$${version} \
+		--tag "${APP}:$${version/+/-}" \
+		.
+
+.PHONY: test
+test: ## Run tests
+	go test ${PKG}/...
+
+.PHONY: changes
+changes: ## Get commits since last release
+	from=$$(git describe --tags --abbrev=0 2>/dev/null); \
+	if [ -n "${from}" ]; then from="${from}"; fi; \
+	to=HEAD; \
+	if [ -n "${to}" ]; then to="${to}"; fi; \
+	git log --oneline --no-decorate $${from}..$${to}
+
+.PHONY: version
+version: ## Generate version from git tag and commit information
+	git describe --exact-match 2>/dev/null || echo $$(git describe --tags --abbrev=0)-dev.$$(git rev-list --count $$(git describe --tags --abbrev=0)..HEAD)+$$(git rev-parse --short=8 HEAD)
+
+.PHONY: help
+help: ## Display this help page
+	grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[33m%-30s\033[0m %s\n", $$1, $$2}'
+
+ifneq "${VERBOSE}" "1"
+.SILENT:
+endif