progress!

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

cmd/herald-worker/main.go

@@ -12,10 +12,13 @@ func main() {
 	for {
 
 		// Do the buldpack thing. 
-		herald.DownloadBuildpacks()
+		buildpacks := herald.GetBuildpacks()
+		for _, bp := range(buildpacks) {
+			log.Print(bp.Download())
+		}
 
 		log.Print("Sleeping for 5 minutes…")
-		
+
 		// Sleep for five minutes. 
 		time.Sleep(5*time.Minute)
 

herald.go

@@ -10,35 +10,56 @@ import "log"
 const BP_TARBALL_TEMPLATE = "https://github.com/heroku/heroku-buildpack-%s/archive/master.zip"
 var BUILDPACKS = []string { "python", "php", "nodejs" }
 
-func getBuildpackZipballs() []string {
-	collected := []string{}
-	
-	for _, bp := range(BUILDPACKS) {
-		// Add comment here. 
-		collected = append(collected, fmt.Sprintf(BP_TARBALL_TEMPLATE, bp))
-	}
-	
-	return collected
 
+type Version string
+
+type Buildpack struct{
+	Versions []Version
+	Tarball string
+	Path string
+	// ExecutablePath string
+	Name string
 }
 
-func DownloadBuildpacks() {
-	
-	// create temp directory
-	// use 'fake' for now
-	target, err := ioutil.TempDir("", "buildpacks")
-	if err != nil {
-		log.Fatal(err)
-	}
+func (b Buildpack) ZipballURI() string {
+	return fmt.Sprintf(BP_TARBALL_TEMPLATE, b.Name)
+}
 
+func (b Buildpack) Download() string {
+	target, _ := ioutil.TempDir("", "buildpacks")
+
+	log.Printf("Downloading '%s'…", b.Name)
+
+	getter.Get(target, b.ZipballURI())
+
+	return target
 	
-	// Download and unpack each Zipball from GitHub. 
-	for _, tb := range(getBuildpackZipballs()) {
-		log.Printf("Downloading '%s' to '%s'…", tb, target)
-		getter.Get(target, tb)
+}
+
+func NewBuildpack(name string) Buildpack {
+	return Buildpack{
+		// Path: nil,
+		// ExecutablePath: path + "/bin/execute",
+		Name: name,
 	}
 }
 
+func GetBuildpacks() []Buildpack {
+	// Download and unpack each Zipball from GitHub. 
+
+	buildpacks := []Buildpack{}
+	for _, bp := range(BUILDPACKS) {
+	// log.Printf("Downloading '%s'…", bp)
+
+	// err := getter.Get(target, tb)
+	// if err != nil {
+	// 	return err
+		buildpacks = append(buildpacks, NewBuildpack(bp))
+	}
+	
+	return buildpacks
+}
+
 // func ExecutesBuildpacks() {
 
 //  glob('*/updater/detect'