blog: also rewrite RSS links

blog.go

@@ -32,7 +32,7 @@ import (
 	"github.com/yuin/goldmark"
 )
 
-const rssBaseUrl = "https://github.com/thiagokokada/blog/blob/main"
+const blogBaseUrl = "https://github.com/thiagokokada/blog/blob/main"
 const readmeTemplate = `# Blog
 
 Mirror of my blog in https://kokada.capivaras.dev/.
@@ -149,12 +149,14 @@ func genRss(posts posts) string {
 		Title:       "kokada's blog",
 		Description: "# dd if=/dev/urandom of=/dev/brain0",
 	}
+	md := goldmark.New(goldmark.WithExtensions(NewLinkRewriter(blogBaseUrl, nil)))
+
 	var items []*feeds.Item
 	for el := posts.Back(); el != nil; el = el.Prev() {
 		post := el.Value
-		link := must1(url.JoinPath(rssBaseUrl, post.file))
+		link := must1(url.JoinPath(blogBaseUrl, post.file))
 		var buf bytes.Buffer
-		must(goldmark.Convert(post.contents, &buf))
+		must(md.Convert(post.contents, &buf))
 		items = append(items, &feeds.Item{
 			Title:       post.title,
 			Link:        &feeds.Link{Href: link},

link_rewriter.go

@@ -28,12 +28,13 @@ import (
 
 // linkRewriter is the main struct for your extension
 type linkRewriter struct {
-	posts posts
+	prefixUrl string
+	posts     posts
 }
 
 // NewLinkRewriter returns a new instance of LinkRewriter
-func NewLinkRewriter(posts posts) *linkRewriter {
-	return &linkRewriter{posts}
+func NewLinkRewriter(prefixUrl string, posts posts) *linkRewriter {
+	return &linkRewriter{prefixUrl, posts}
 }
 
 // Extend will be called by Goldmark to add your extension
@@ -63,12 +64,20 @@ func (e *linkRewriter) rewriteLink(l *ast.Link) {
 	}
 
 	if strings.HasPrefix(link, "/") {
-		post, ok := e.posts.Get(link[1:])
-		if ok {
-			dest := must1(url.JoinPath(mataroaBlogUrl, post.slug))
-			l.Destination = []byte(dest)
+		if e.posts != nil {
+			// If posts are not nil, it means we will grab the slug
+			// from posts
+			post, ok := e.posts.Get(link[1:])
+			if ok {
+				dest := must1(url.JoinPath(e.prefixUrl, post.slug))
+				l.Destination = []byte(dest)
+			} else {
+				log.Printf("[WARN]: did not find reference to link: %s\n", link)
+			}
 		} else {
-			log.Printf("[WARN]: did not find reference to link: %s\n", link)
+			// Else we will just append the prefixUrl to the link
+			dest := must1(url.JoinPath(e.prefixUrl, link))
+			l.Destination = []byte(dest)
 		}
 	}
 }

mataroa.go

@@ -108,7 +108,7 @@ func mustPostMataroaPost(md goldmark.Markdown, post post) (p mataroaResponse, r
 func publishToMataroa(posts posts) {
 	md := goldmark.New(
 		goldmark.WithRenderer(markdown.NewRenderer()),
-		goldmark.WithExtensions(NewLinkRewriter(posts)),
+		goldmark.WithExtensions(NewLinkRewriter(mataroaBlogUrl, posts)),
 	)
 	for el := posts.Front(); el != nil; el = el.Next() {
 		post := el.Value