GetReposHandler

// GetReposHandler returns a list of (public) repositories for a given GitHub user
func (a *App) GetReposHandler(w http.ResponseWriter, r *http.Request) {
	user := r.FormValue("user")
	if user == "" {
		http.Error(w, "MISSING_ARG_USER", 400)
		return
	}

	repos, err := a.repos.Get(user)
	if err != nil {
		http.Error(w, "INTERNAL_ERROR", 500)
		return
	}

	b, err := json.Marshal(repos)
	if err != nil {
		http.Error(w, "INTERNAL_ERROR", 500)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	w.Write(b)
}