feat: set up project skeleton for new CLI (#1)

* docs: fill in README
* feat: initial setup of CLI, with help + version commands
* build: add linters and Makefile
* build: add initial CircleCI workflow

Makefile

@@ -0,0 +1,68 @@
+### Environment setup
+export GOPATH=$(shell go env GOPATH)
+export GOOS=$(shell go env GOOS)
+export GOARCH=$(shell go env GOARCH)
+export GOVERSION=$(shell go list -m -f '{{.GoVersion}}')
+
+ifeq ($(OS), Windows_NT)
+	VERSION := $(shell git describe --exact-match --tags 2>nil)
+else
+	VERSION := $(shell git describe --exact-match --tags 2>/dev/null)
+endif
+COMMIT := $(shell git rev-parse --short HEAD)
+
+LDFLAGS := $(LDFLAGS) -X main.commit=$(COMMIT) -X main.date=$(shell date -u +'%Y-%m-%dT%H:%M:%SZ')
+ifdef VERSION
+	LDFLAGS += -X main.version=$(VERSION)
+endif
+export GO_BUILD=go build -ldflags "$(LDFLAGS)"
+
+SOURCES := $(shell find . -name '*.go' -not -name '*_test.go') go.mod go.sum
+SOURCES_NO_VENDOR := $(shell find . -path ./vendor -prune -o -name "*.go" -not -name '*_test.go' -print)
+
+# Allow for `go test` to be swapped out by other tooling, i.e. `gotestsum`
+export GO_TEST=go test
+# Allow for a subset of tests to be specified.
+GO_TEST_PATHS=./...
+
+### Build / dependency management
+fmt: $(SOURCES_NO_VENDOR)
+	gofmt -w -s $^
+	go run github.com/daixiang0/gci -w $^
+
+bin/$(GOOS)/influx: $(SOURCES)
+	$(GO_BUILD) -o $@ ./cmd/$(shell basename "$@")
+
+influx: bin/$(GOOS)/influx
+
+vendor: go.mod go.sum
+	go mod vendor
+
+build: fmt influx
+
+clean:
+	$(RM) -r bin
+	$(RM) -r vendor
+
+### Linters
+checkfmt:
+	./etc/checkfmt.sh
+
+checktidy:
+	./etc/checktidy.sh
+
+staticcheck: $(SOURCES) vendor
+	go run honnef.co/go/tools/cmd/staticcheck -go $(GOVERSION) ./...
+
+vet:
+	go vet ./...
+
+# Testing
+test:
+	$(GO_TEST) $(GO_TEST_PATHS)
+
+test-race:
+	$(GO_TEST) -v -race -count=1 $(GO_TEST_PATHS)
+
+### List of all targets that don't produce a file
+.PHONY: influx fmt build checkfmt checktidy staticcheck vet test test-race