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package main
import (
"bufio"
"html"
"html/template"
"io/ioutil"
"log"
"net/url"
"os"
"sort"
"strings"
"time"
"git.sr.ht/~sircmpwn/getopt"
"github.com/SlyMarbo/rss"
"github.com/mattn/go-runewidth"
"github.com/microcosm-cc/bluemonday"
)
type urlSlice []*url.URL
func (us *urlSlice) String() string {
var str []string
for _, u := range *us {
str = append(str, u.String())
}
return strings.Join(str, ", ")
}
func (us *urlSlice) Set(val string) error {
u, err := url.Parse(val)
if err != nil {
return err
}
*us = append(*us, u)
return nil
}
type Article struct {
Date time.Time
Link string
SourceLink string
SourceTitle string
Summary template.HTML
Title string
}
func main() {
var (
narticles = getopt.Int("n", 3, "article count")
perSource = getopt.Int("p", 1, "articles to take from each source")
summaryLen = getopt.Int("l", 256, "length of summaries")
urlsFile = getopt.String("S", "", "file with URLs of sources")
sources []*url.URL
)
getopt.Var((*urlSlice)(&sources), "s", "list of sources")
getopt.Usage = func() {
log.Fatalf("Usage: %s [-s https://source.rss...] < in.html > out.html",
os.Args[0])
}
err := getopt.Parse()
if err != nil {
panic(err)
}
if *urlsFile != "" {
file, err := os.Open(*urlsFile)
if err != nil {
panic(err)
}
sc := bufio.NewScanner(file)
for sc.Scan() {
(*urlSlice)(&sources).Set(sc.Text())
}
file.Close()
}
input, err := ioutil.ReadAll(os.Stdin)
if err != nil {
panic(err)
}
tmpl, err := template.
New("template").
Funcs(map[string]interface{}{
"date": func(t time.Time) string {
return t.Format("January 2, 2006")
},
"datef": func(fmt string, t time.Time) string {
return t.Format(fmt)
},
}).
Parse(string(input))
if err != nil {
panic(err)
}
log.Println("Fetching feeds...")
var feeds []*rss.Feed
for _, source := range sources {
feed, err := rss.Fetch(source.String())
if err != nil {
log.Printf("Error fetching %s: %s", source.String(), err.Error())
continue
}
feeds = append(feeds, feed)
log.Printf("Fetched %s", feed.Title)
}
if len(feeds) == 0 {
log.Fatal("Expected at least one feed to successfully fetch")
}
policy := bluemonday.StrictPolicy()
var articles []*Article
for _, feed := range feeds {
if len(feed.Items) == 0 {
log.Printf("Warning: feed %s has no items", feed.Title)
continue
}
items := feed.Items
if len(items) > *perSource {
items = items[:*perSource]
}
base, err := url.Parse(feed.UpdateURL)
if err != nil {
log.Fatal("failed parsing update URL of the feed")
}
feedLink, _ := url.Parse(feed.Link)
if err != nil {
log.Fatal("failed parsing canonical feed URL of the feed")
}
for _, item := range items {
raw_summary := item.Summary
if len(raw_summary) == 0 {
raw_summary = html.UnescapeString(item.Content)
}
summary := runewidth.Truncate(
policy.Sanitize(raw_summary), *summaryLen, "…")
itemLink, _ := url.Parse(item.Link)
if err != nil {
log.Fatal("failed parsing article URL of the feed item")
}
articles = append(articles, &Article{
Date: item.Date,
SourceLink: base.ResolveReference(feedLink).String(),
SourceTitle: feed.Title,
Summary: template.HTML(summary),
Title: item.Title,
Link: base.ResolveReference(itemLink).String(),
})
}
}
sort.Slice(articles, func(i, j int) bool {
return articles[i].Date.After(articles[j].Date)
})
if len(articles) < *narticles {
*narticles = len(articles)
}
articles = articles[:*narticles]
err = tmpl.Execute(os.Stdout, struct {
Articles []*Article
}{
Articles: articles,
})
if err != nil {
panic(err)
}
}
|
