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path: root/rss.go
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package main

import (
	"fmt"
	"log"
	"time"

	"dim13.org/rss"
	irc "github.com/fluffle/goirc/client"
)

type Feed struct {
	Name  string
	URL   string
	Every time.Duration
}

var Feeds = []Feed{
	{
		Name:  "LOR News",
		URL:   `https://www.linux.org.ru/section-rss.jsp?section=1`,
		Every: time.Hour,
	},
	{
		Name:  "LOR Forum",
		URL:   `https://www.linux.org.ru/section-rss.jsp?section=2&filter=tech`,
		Every: 5 * time.Minute,
	},
	{
		Name:  "LOR Gallery",
		URL:   `https://www.linux.org.ru/section-rss.jsp?section=3`,
		Every: 2 * time.Hour,
	},
	{
		Name:  "LOR Polls",
		URL:   `https://www.linux.org.ru/section-rss.jsp?section=5`,
		Every: 2 * time.Hour,
	},
	{
		Name:  "OpenNET",
		URL:   `http://www.opennet.ru/opennews/opennews_all_noadv.rss`,
		Every: 4 * time.Hour,
	},
}

type News struct {
	Feed
	rss.Item
}

func (n News) String() string {
	s := fmt.Sprintf("%v: %v", n.Name, n.Title)
	if n.Author != "" {
		s += fmt.Sprintf(" (%v) ", n.Author)
	} else {
		s += " - "
	}
	s += fmt.Sprintf("%v", n.Link)
	return s
}

func ShowNews(conn *irc.Conn, room string) {
	news := make(chan News)

	for _, f := range Feeds {
		go func(f Feed) {
			ticker := time.NewTicker(f.Every)
			defer ticker.Stop()
			for t := range ticker.C {
				r, err := rss.Fetch(f.URL)
				if err != nil {
					log.Println(f.Name, err)
					return
				}
				to := t.Add(-f.Every)
				for _, i := range r.Channel.Items {
					if i.PubDate.After(to) {
						news <- News{f, i}
					}
				}
			}
		}(f)
	}

	go func() {
		for n := range news {
			conn.Notice(room, n.String())
		}
	}()
}