use go modules

vendor/github.com/spf13/cast/Makefile

@@ -0,0 +1,40 @@
+GOVERSION := $(shell go version | cut -d ' ' -f 3 | cut -d '.' -f 2)
+
+.PHONY: check fmt lint test test-race vet test-cover-html help
+.DEFAULT_GOAL := help
+
+check: test-race fmt vet lint ## Run tests and linters
+
+test: ## Run tests
+	go test ./...
+
+test-race: ## Run tests with race detector
+	go test -race ./...
+
+fmt: ## Run gofmt linter
+ifeq "$(GOVERSION)" "12"
+	@for d in `go list` ; do \
+		if [ "`gofmt -l -s $$GOPATH/src/$$d | tee /dev/stderr`" ]; then \
+			echo "^ improperly formatted go files" && echo && exit 1; \
+		fi \
+	done
+endif
+
+lint: ## Run golint linter
+	@for d in `go list` ; do \
+		if [ "`golint $$d | tee /dev/stderr`" ]; then \
+			echo "^ golint errors!" && echo && exit 1; \
+		fi \
+	done
+
+vet: ## Run go vet linter
+	@if [ "`go vet | tee /dev/stderr`" ]; then \
+		echo "^ go vet errors!" && echo && exit 1; \
+	fi
+
+test-cover-html: ## Generate test coverage report
+	go test -coverprofile=coverage.out -covermode=count
+	go tool cover -func=coverage.out
+
+help:
+	@grep -E '^[a-zA-Z0-9_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'