Add travis config

.gitignore

@@ -1,2 +1,3 @@
 .idea
 dnslookup
+build

.travis.yml

@@ -0,0 +1,39 @@
+language: go
+sudo: false
+
+os:
+  - linux
+
+env:
+  - GO111MODULE=on
+  - GIMME_GO_VERSION=1.x
+
+go:
+  - 1.x
+  - 1.11
+
+script:
+  # Windows-386 build
+  - GOOS=windows GOARCH=386 VERSION=${TRAVIS_TAG:-dev} make release
+  # Windows-amd64 build
+  - GOOS=windows GOARCH=amd64 VERSION=${TRAVIS_TAG:-dev} make release
+  # Linux-386 build
+  - GOOS=linux GOARCH=386 VERSION=${TRAVIS_TAG:-dev} make release
+  # Linux-amd64 build
+  - GOOS=linux GOARCH=amd64 VERSION=${TRAVIS_TAG:-dev} make release
+  # Darwin-amd64 build
+  - GOOS=darwin GOARCH=amd64 VERSION=${TRAVIS_TAG:-dev} make release
+  # List build output
+  - ls -l build/dnslookup-*
+
+deploy:
+  provider: releases
+  api_key: $GITHUB_TOKEN
+  file:
+    - build/dnslookup-*.zip
+    - build/dnslookup-*.tar.gz
+  on:
+    repo: ameshkov/dnslookup
+    tags: true
+  file_glob: true
+  skip_cleanup: true

Makefile

@@ -0,0 +1,43 @@
+NAME=dnslookup
+BASE_BUILDDIR=build
+BUILDNAME=$(GOOS)-$(GOARCH)
+BUILDDIR=$(BASE_BUILDDIR)/$(BUILDNAME)
+VERSION?=dev
+
+ifeq ($(GOOS),windows)
+  ext=.exe
+  archiveCmd=zip -9 -r $(NAME)-$(BUILDNAME)-$(VERSION).zip $(BUILDNAME)
+else
+  ext=
+  archiveCmd=tar czpvf $(NAME)-$(BUILDNAME)-$(VERSION).tar.gz $(BUILDNAME)
+endif
+
+.PHONY: default
+default: build
+
+build: clean test
+	go build
+
+release: check-env-release
+	mkdir -p $(BUILDDIR)
+	cp LICENSE $(BUILDDIR)/
+	cp README.md $(BUILDDIR)/
+	GOOS=$(GOOS) GOARCH=$(GOARCH) go build -ldflags "-X main.VersionString=$(VERSION)" -o $(BUILDDIR)/$(NAME)$(ext)
+	cd $(BASE_BUILDDIR) ; $(archiveCmd)
+
+test:
+	go test -race -v -bench=. ./...
+
+clean:
+	go clean
+	rm -rf $(BASE_BUILDDIR)
+
+check-env-release:
+	@ if [ "$(GOOS)" = "" ]; then \
+		echo "Environment variable GOOS not set"; \
+		exit 1; \
+	fi
+	@ if [ "$(GOARCH)" = "" ]; then \
+		echo "Environment variable GOOS not set"; \
+		exit 1; \
+	fi

README.md

@@ -1,3 +1,7 @@
+[![Build Status](https://travis-ci.org/ameshkov/dnslookup.svg?branch=master)](https://travis-ci.org/ameshkov/dnslookup)
+[![Go Report Card](https://goreportcard.com/badge/github.com/ameshkov/dnslookup)](https://goreportcard.com/report/ameshkov/dnslookup)
+[![GolangCI](https://golangci.com/badges/github.com/ameshkov/dnslookup.svg)](https://golangci.com/r/github.com/ameshkov/dnslookup)
+
 # dnslookup
 
 Simple command line utility to make DNS lookups to the specified server.

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"encoding/hex"
+	"fmt"
 	"log"
 	"os"
 	"strings"
@@ -13,7 +14,12 @@ import (
 	"github.com/miekg/dns"
 )
 
+// See the makefile
+var VersionString = "undefined"
+
 func main() {
+	os.Stdout.WriteString(fmt.Sprintf("dnslookup %s", VersionString))
+
 	if len(os.Args) != 3 && len(os.Args) != 5 {
 		log.Printf("Wrong number of arguments")
 		usage()
@@ -60,14 +66,14 @@ func main() {
 		log.Fatalf("Cannot make the DNS request: %s", err)
 	}
 
-	_,_ = os.Stdout.WriteString("dnslookup result:")
-	_,_ = os.Stdout.WriteString(reply.String())
+	os.Stdout.WriteString("dnslookup result:")
+	os.Stdout.WriteString(reply.String())
 }
 
 func usage() {
-	log.Print("Usage: dnslookup <domain> <server> [<providerName> <serverPk>]")
-	log.Print("<domain>: mandatory, domain name to lookup")
-	log.Print("<server>: mandatory, server address. Supported: plain, tls:// (DOT), https:// (DOH), sdns:// (DNSCrypt)")
-	log.Print("<providerName>: optional, DNSCrypt provider name")
-	log.Print("<serverPk>: optional, DNSCrypt server public key")
+	os.Stdout.WriteString("Usage: dnslookup <domain> <server> [<providerName> <serverPk>]")
+	os.Stdout.WriteString("<domain>: mandatory, domain name to lookup")
+	os.Stdout.WriteString("<server>: mandatory, server address. Supported: plain, tls:// (DOT), https:// (DOH), sdns:// (DNSCrypt)")
+	os.Stdout.WriteString("<providerName>: optional, DNSCrypt provider name")
+	os.Stdout.WriteString("<serverPk>: optional, DNSCrypt server public key")
 }