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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
	Period time.Duration
}

var Feeds = []Feed{
	{
		Name:   "LOR News",
		URL:    `https://www.linux.org.ru/section-rss.jsp?section=1`,
		Period: time.Hour,
	},
	{
		Name:   "LOR Forum",
		URL:    `https://www.linux.org.ru/section-rss.jsp?section=2&filter=tech`,
		Period: time.Minute,
	},
	{
		Name:   "LOR Gallery",
		URL:    `https://www.linux.org.ru/section-rss.jsp?section=3`,
		Period: 2 * time.Hour,
	},
	{
		Name:   "LOR Polls",
		URL:    `https://www.linux.org.ru/section-rss.jsp?section=5`,
		Period: 2 * time.Hour,
	},
	{
		Name:   "OpenNET",
		URL:    `http://www.opennet.ru/opennews/opennews_all_noadv.rss`,
		Period: 4 * time.Hour,
	},
	{
		Name:   "Undeadly",
		URL:    `http://undeadly.org/cgi?action=rss`,
		Period: 2 * time.Hour,
	},
	{
		Name:   "Kernel",
		URL:    `https://www.kernel.org/feeds/kdist.xml`,
		Period: 6 * time.Hour,
	},
}

type News struct {
	Feed
	rss.Item
}

var news = make(chan News)

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, _ *irc.Line) {
	for n := range news {
		conn.Notice(*room, n.String())
	}
}

func init() {
	for _, f := range Feeds {
		go func(c chan News, f Feed) {
			ticker := time.NewTicker(f.Period)
			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.Period)
				for _, i := range r.Channel.Items {
					if i.PubDate.After(to) {
						c <- News{f, i}
					}
				}
			}
		}(news, f)
	}
}