update

// update polls(1) from tj/gh-polls on github
p := &update.Project{
	Command: "polls",
	Owner:   "tj",
	Repo:    "gh-polls",
	Version: "0.0.3",
}

// fetch the new releases
releases, err := p.LatestReleases()
if err != nil {
	log.Fatalf("error fetching releases: %s", err)
}

// no updates
if len(releases) == 0 {
	log.Println("no updates")
	return
}

// latest release
latest := releases[0]

// find the asset for this system
a := latest.FindTarball(runtime.GOOS, runtime.GOARCH)
if a == nil {
	log.Println("no binary for your system")
	return
}

// whitespace
fmt.Println()

path, err := a.DownloadProxy(progress.Reader)
if err != nil {
	log.Fatalf("error downloading: %s", err)
}

// replace the previous
if err := p.Install(path); err != nil {
	log.Fatalf("error installing: %s", err)
}

fmt.Printf("Updated to %s\n", latest.Version)

Output: