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path: root/rss.go
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package main

import (
	"fmt"
	"log"
	"time"

	"dim13.org/rss"
)

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: 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,
	},
	{
		Name:  "Undeadly",
		URL:   `http://undeadly.org/cgi?action=rss`,
		Every: 2 * time.Hour,
	},
	{
		Name:  "Kernel",
		URL:   `https://www.kernel.org/feeds/kdist.xml`,
		Every: 6 * time.Hour,
	},
	{
		Name:  "Ted Unangst",
		URL:   `http://www.tedunangst.com/flak/rss`,
		Every: 6 * time.Hour,
	},
	{
		Name:  "Calomel",
		URL:   `https://calomel.org/calomel_rss.xml`,
		Every: 6 * time.Hour,
	},
	{
		Name:  "Golang News",
		URL:   `https://golangnews.com/index.xml`,
		Every: 6 * time.Hour,
	},
	{
		Name:  "Golang Weekly",
		URL:   `http://golangweekly.com/rss/1fg21ahk`,
		Every: 6 * 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 (f Feed) Watch(news chan News) {
	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
		}
		last := t.Add(-f.Every)
		for _, i := range r.Channel.Items {
			if i.PubDate.After(last) {
				news <- News{f, i}
			}
		}
	}
}

func watchNews(msg chan string) {
	news := make(chan News)
	for _, feed := range Feeds {
		go feed.Watch(news)
	}
	for n := range news {
		msg <- fmt.Sprint(n)
	}
}