Ugly code

main.go

package main

import (
	"encoding/xml"

	"flag"
	"fmt"

	"net/http"
	"os"
	"text/template"
)

var (
	rssUrl string
	o      string
)

func init() {
	flag.StringVar(&rssUrl, "rss-url", "", "")
	flag.StringVar(&o, "output-file", "", "")
	flag.Parse()
}

func main() {
	if err := run(); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}

func run() error {
	// will get rss feed
	v, err := get_rssFeed()
	if err == nil {
		f, err := os.Create(o)
		if err != nil {
			return err
		}
		defer f.Close()

		tmpl, _ := template.New("").Parse(`{{range .Channel.Item}}
## {{.Title}}

{{.Description}}

{{.Link}}
{{end}}`)
		if err := tmpl.Execute(f, v); err != nil {
			return err
		}

		return nil
	} else {
		return err
	}
}

// get_rssFeed downloads the rss feed and returns
// the parsed rss feed
// error occurs either when:
// - the http request fails
// - the status code not 200
// - it fails to parse the xml content
func get_rssFeed() (*RssFeed, error) {
	resp, err := http.Get(rssUrl)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	if resp.StatusCode < 200 || resp.StatusCode > 299 {
		return nil, fmt.Errorf("unexpected status code %v for url %v", resp.StatusCode, rssUrl)
	}

	feed := RssFeed{}
	if err := xml.NewDecoder(resp.Body).Decode(&feed); err != nil {
		return nil, err
	}

	return &feed, nil
}

type RssFeed struct {
	XMLName xml.Name `xml:"rss"`
	Text    string   `xml:",chardata"`
	Version   string   `xml:"version,attr"`
	Atom    string   `xml:"atom,attr"`
	Channel struct     {
		Text            string `xml:",chardata"`
		Title         string `xml:"title"`
		Description  string `xml:"description"`
		Copyright   string `xml:"copyright"`
		Link        struct {
			Text string `xml:",chardata"`
			Href string `xml:"href,attr"`
			Rel  string `xml:"rel,attr"`
			Type string `xml:"type,attr"`
		} `xml:"link"`
	PubDate string `xml:"pubDate"`
		   Image   struct {
			Text  string `xml:",chardata"`
			URL   string `xml:"url"`
			Title string `xml:"title"`
			Link  string `xml:"link"`
		} `xml:"image"`
		Item []struct {
			Text        string `xml:",chardata"`
			Link        string `xml:"link"`
			Title       string `xml:"title"`
			Description string `xml:"description"`
			  PubDate     string `xml:"pubDate"`
			  Guid        struct {
				Text        string `xml:",chardata"`
				IsPermaLink string `xml:"isPermaLink,attr"`
			  } `xml:"guid"`
			Enclosure struct {
				Text   string `xml:",chardata"`
				URL    string `xml:"url,attr"`
				Type   string `xml:"type,attr"`
				Length string `xml:"length,attr"`
			} `xml:"enclosure"`
		} `xml:"item"`
	} `xml:"channel"`
}