List reddit entries in golang

reddit.go

package main

import (
	"encoding/json"
	"flag"
	"fmt"
	"io/ioutil"
	"net/http"
)

type RedditEntry struct {
	Data struct {
		Children []struct {
			Data struct {
				Domain    string
				Subreddit string
				Url       string
				Title     string
			}
		}
	}
}

func (reddit *RedditEntry) List() {
	for _, entry := range reddit.Data.Children {
		fmt.Println(entry.Data.Title, "["+entry.Data.Url+"]", "\n")
	}
}

const (
	REDDIT = "http://www.reddit.com"
)

func err(e error) {
	if e != nil {
		panic(e)
	}
}

func main() {
	var subreddit string
	var listing string
	flag.StringVar(&subreddit, "sub", "", "The subreddit")
	flag.StringVar(&listing, "list", "new", "Kind of listing: how, new, random, controversial, top")
	flag.Parse()
	
	var request string
	if len(subreddit) > 0 {
		request = REDDIT + "/r/" + subreddit + "/" + listing + ".json"
	} else {
		request = REDDIT + "/" + listing + ".json"
	}

	resp, e := http.Get(request)
	err(e)
	defer resp.Body.Close()

	body, e := ioutil.ReadAll(resp.Body)
	err(e)

	var reddit RedditEntry
	e = json.Unmarshal(body, &reddit)
	err(e)
	reddit.List()
}