Add a release system. (#550)

* feat: add release system.
* feat: goreleaser.
* review: minor changes.

.gitignore

@@ -2,3 +2,5 @@ lego.exe
 lego
 .lego
 .idea
+dist/
+builds/

.goreleaser.yml

@@ -0,0 +1,38 @@
+project_name: lego
+
+builds:
+  - binary: lego
+    goos:
+      - windows
+      - darwin
+      - linux
+      - freebsd
+      - openbsd
+      - solaris
+    goarch:
+      - amd64
+      - 386
+      - arm
+      - arm64
+    goarm:
+      - 7
+
+    ignore:
+      - goos: darwin
+        goarch: 386
+      - goos: openbsd
+        goarch: arm
+
+archive:
+  name_template: '{{ .ProjectName }}_v{{ .Version }}_{{ .Os }}_{{ .Arch }}{{ if .Arm
+    }}v{{ .Arm }}{{ end }}'
+  format: tar.gz
+  format_overrides:
+    - goos: windows
+      format: zip
+  files:
+    - LICENSE
+    - CHANGELOG.md
+
+release:
+  disable: true

.travis.yml

@@ -1,16 +1,35 @@
 language: go
+
 go:
-- 1.8.x
   - 1.9.x
-- tip
+  - 1.x
+
 services:
   - memcached
+
 env:
   - MEMCACHED_HOSTS=localhost:11211
-install:
-- go get -t ./...
-script:
-- go vet ./...
-- go test -v ./...
+
 before_install:
   - '[ "${TRAVIS_PULL_REQUEST}" = "false" ] && openssl aes-256-cbc -K $encrypted_26c593b079d9_key -iv $encrypted_26c593b079d9_iv -in .gitcookies.enc -out .gitcookies -d || true'
+
+install:
+  - go get -t ./...
+
+deploy:
+  - provider: script
+    skip_cleanup: true
+    script: curl -sL https://git.io/goreleaser | bash
+    on:
+      tags: true
+      condition: $TRAVIS_GO_VERSION =~ ^1\.10\.[0-9]+$
+
+  - provider: releases
+    api_key: ${GITHUB_TOKEN}
+    file: dist/lego_*
+    skip_cleanup: true
+    overwrite: true
+    file_glob: true
+    on:
+      tags: true
+      condition: $TRAVIS_GO_VERSION =~ ^1\.10\.[0-9]+$

Makefile

@@ -0,0 +1,15 @@
+.PHONY: all
+
+default: clean checks test build
+
+test: clean
+	go test -v -cover ./...
+
+clean:
+	rm -rf dist/ builds/ cover.out
+
+checks:
+	go vet ./...
+
+build: clean
+	go build

cli.go

@@ -7,7 +7,6 @@ import (
 	"log"
 	"os"
 	"path"
-	"strings"
 	"text/tabwriter"
 
 	"github.com/urfave/cli"
@@ -25,18 +24,15 @@ func logger() *log.Logger {
 	return Logger
 }
 
-var gittag string
+var (
+	version = "dev"
+)
 
 func main() {
 	app := cli.NewApp()
 	app.Name = "lego"
 	app.Usage = "Let's Encrypt client written in Go"
 
-	version := "0.4.1"
-	if strings.HasPrefix(gittag, "v") {
-		version = gittag
-	}
-
 	app.Version = version
 
 	acme.UserAgent = "lego/" + app.Version