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feed.go
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/
feed.go
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package bs
import (
"bytes"
"os"
"path/filepath"
"text/template"
"time"
"github.com/charmbracelet/log"
"github.com/tdewolff/minify/v2"
"github.com/tdewolff/minify/v2/json"
"github.com/tdewolff/minify/v2/xml"
)
// A data type that has all the data necessary to
// generate an Atom, RSS, and JSON feed
type Feed struct {
Title string
Subtitle string
Language string
Name string
Email string
Posts []*Post
// the domain name of the site (homepage, https://bensmith.sh)
AbsoluteUrl string
}
// Create a new `Feed` struct which will have data necessary to
// generate an Atom, RSS, and JSON feed
func NewFeed(posts []*Post) Feed {
return Feed{
Title: "Ben Smith’s Blog",
Subtitle: "Ben’s writings and thoughts about tech",
Language: "en",
AbsoluteUrl: "https://bensmith.sh",
Name: "Ben Smith",
Email: "bsmithdev@mailbox.org",
Posts: posts,
}
}
// Needed in Atom feed template to use the latest post's date as the content
// for the `<updated>` tag
func (feed Feed) GetNewestPostDate() string {
return feed.Posts[0].FormatRFC3339()
}
// Generate and write a new Feed to our build directory
func (feed Feed) Generate(slug string, feedType string) time.Time {
// split the slug into its surrounding directory and filename
slugDir, slugFilename := filepath.Split(slug)
// ensure that a valid `feedType` was supplied
var templateName string
switch feedType {
case "rss":
templateName = "rss.tmpl.xml"
case "atom":
templateName = "atom.tmpl.xml"
case "json":
templateName = "json.tmpl.json"
default:
log.Fatalf("`feedType` '%s' should be one of 'rss', 'atom', or 'json'.", feedType)
}
// load the text template
templatePath := filepath.Join(Dirs.Templates, templateName)
tmpl, err := template.ParseFiles(templatePath)
if err != nil {
log.Fatalf("failed to load `%s` template for `%s` feed", templatePath, feedType)
}
// create a new buffer and write the template to it
var buf bytes.Buffer
err = tmpl.Execute(&buf, feed)
if err != nil {
log.Fatalf("failed to execute `%s` template: %v", slugFilename, err)
}
// create the file to write to
outputDir := filepath.Join(Dirs.Build, slugDir)
if err := os.MkdirAll(outputDir, os.ModePerm); err != nil {
log.Fatalf("failed to create output directory: %v", err)
}
outputPath := filepath.Join(outputDir, slugFilename)
file, err := os.Create(outputPath)
if err != nil {
log.Fatalf("failed to create output file for `%s`: %v", outputPath, err)
}
defer file.Close()
// minify the XML or JSON and write the buffer to the file
var mimetype string
m := minify.New()
if slugFilename == "rss.json" {
mimetype = "application/json"
m.AddFunc(mimetype, json.Minify)
} else {
mimetype = "text/xml"
m.AddFunc(mimetype, xml.Minify)
}
mw := m.Writer(mimetype, file)
if mw.Write(buf.Bytes()); err != nil {
log.Fatalf("Couldn't minify the `%s` feed, %v", slugFilename, err)
}
if err := mw.Close(); err != nil {
log.Fatalf("Error executing the feed minfier's `io.Close` method, %v", err)
}
// log successful creation and return modified at time of output file
log.Infof("Created %s", slug)
info, _ := file.Stat()
return info.ModTime()
}