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+#!/usr/bin/make
+# Makefile manual (ru): <http://linux.yaroslavl.ru/docs/prog/gnu_make_3-79_russian_manual.html>
+# Makefile manual (en): <https://www.gnu.org/software/make/manual/html_node/index.html#SEC_Contents>
+
+SHELL = /bin/sh
+GO_VERSION = 1.17
+DOCKER_GO_RUN_ARGS = --rm -v "$(shell pwd):/src" -w "/src" -u "$(shell id -u):$(shell id -g)" -e "GOPATH=/tmp" -e "HOME=/tmp"
+
+.PHONY : help build fmt lint gotest test
+.DEFAULT_GOAL : help
+
+# This will output the help for each task. Thanks to https://marmelab.com/blog/2016/02/29/auto-documented-makefile.html
+help: ## Show this help
+ @printf "\033[33m%s:\033[0m\n" 'Available commands'
+ @awk 'BEGIN {FS = ":.*?## "} /^[a-zA-Z_-]+:.*?## / {printf " \033[32m%-11s\033[0m %s\n", $$1, $$2}' $(MAKEFILE_LIST)
+
+image: ## Build docker image with app
+ docker build -f ./Dockerfile -t rr:local .
+ @printf "\n \e[30;42m %s \033[0m\n\n" 'Now you can use image like `docker run --rm rr:local ...`';
+
+build: ## Build app binary file
+ docker run $(DOCKER_GO_RUN_ARGS) -e "CGO_ENABLED=0" "golang:$(GO_VERSION)-buster" \
+ go build -trimpath -ldflags "-s" -o ./rr ./cmd/rr
+
+fmt: ## Run source code formatter tools
+ docker run $(DOCKER_GO_RUN_ARGS) -e "GO111MODULE=off" "golang:$(GO_VERSION)-buster" \
+ sh -c 'go get golang.org/x/tools/cmd/goimports && $$GOPATH/bin/goimports -d -w .'
+ docker run $(DOCKER_GO_RUN_ARGS) "golang:$(GO_VERSION)-buster" \
+ sh -c 'gofmt -s -w -d .; go mod tidy'
+
+lint: ## Run app linters
+ docker run $(DOCKER_GO_RUN_ARGS) -t golangci/golangci-lint:v1.39-alpine golangci-lint run
+
+gotest: ## Run app tests
+ docker run $(DOCKER_GO_RUN_ARGS) -t "golang:$(GO_VERSION)-buster" go test -v -race -timeout 10s ./...
+
+test: lint gotest ## Run app tests and linters