package main

import (
	"log"

	"gopkg.in/src-d/go-git.v4"
	"gopkg.in/src-d/go-git.v4/config"
	"gopkg.in/src-d/go-git.v4/storage/memory"
)

// Retrieve remote tags without cloning repository
func main() {

	// Create the remote with repository URL
	rem := git.NewRemote(memory.NewStorage(), &config.RemoteConfig{
		Name: "origin",
		URLs: []string{"https://github.com/Zenika/MARCEL"},
	})

	log.Print("Fetching tags...")

	// We can then use every Remote functions to retrieve wanted informations
	refs, err := rem.List(&git.ListOptions{})
	if err != nil {
		log.Fatal(err)
	}

	// Filters the references list and only keeps tags
	var tags []string
	for _, ref := range refs {
		if ref.Name().IsTag() {
			tags = append(tags, ref.Name().Short())
		}
	}

	if len(tags) == 0 {
		log.Println("No tags!")
		return
	}

	log.Printf("Tags found: %v", tags)
}