add pagination to microblog

internal/microblog/microblog.go

@@ -6,6 +6,8 @@ import (
 	"gemini_site/internal/pocketbase"
 	"log/slog"
 	"os"
+	"regexp"
+	"strconv"
 	"strings"
 	"time"
 
@@ -131,8 +133,8 @@ func transformNostrPost(p pbPost) post {
 }
 
 // GetRecentPosts returns the most recent posts
-func (mb *MicroBlog) GetRecentPosts(limit int) ([]post, error) {
+func (mb *MicroBlog) GetRecentPosts(limit int, page int) ([]post, error) {
-	res, err := mb.pbClient.GetList("micro_blog_posts", 1, limit, "-posted")
+	res, err := mb.pbClient.GetList("micro_blog_posts", page, limit, "-posted")
 	if err != nil {
 		return nil, fmt.Errorf("failed to fetch posts from pocketbase: %w", err)
 	}
@@ -165,15 +167,36 @@ func (mb *MicroBlog) GetRecentPosts(limit int) ([]post, error) {
 	return filteredPosts, nil
 }
 
+func replaceLinks(content string) string {
+	// Regex: ^(https?://\S+)
+	// ^           : start of line
+	// https?      : http or https
+	// ://         : literal
+	// \S+         : one or more non-whitespace characters
+	re := regexp.MustCompile(`(?m)^(https?://\S+)`)
+	// Replace each match with "=> <url>"
+	return re.ReplaceAllStringFunc(content, func(match string) string {
+		return "=> " + match
+	})
+}
+
 // HandleBlogRequest handles Gemini requests for the microblog
 func (mb *MicroBlog) HandleBlogRequest(w gemini.ResponseWriter, req *gemini.Request) {
 	path := req.URL.Path
 
 	switch {
 	case path == "/microblog" || path == "/microblog/":
-		mb.serveIndex(w, req)
+		mb.serveIndex(w, req, 1)
+	case strings.HasPrefix(path, "/microblog/page/"):
+		pageNum := strings.TrimPrefix(path, "/microblog/page/")
+		num, err := strconv.Atoi(pageNum)
+		if err != nil {
+			w.WriteStatusMsg(gemini.StatusBadRequest, "Invalid page number")
+			return
+		}
+		mb.serveIndex(w, req, num)
 	// case strings.HasPrefix(path, "/microblog/post/"):
-	// 	postID := strings.TrimPrefix(path, "/microblog/post/")
+	// postID := strings.TrimPrefix(path, "/microblog/post/")
 	// 	mb.servePost(w, req, postID)
 	default:
 		w.WriteStatusMsg(gemini.StatusNotFound, "Page not found")
@@ -182,7 +205,8 @@ func (mb *MicroBlog) HandleBlogRequest(w gemini.ResponseWriter, req *gemini.Requ
 
 func drawPost(builder *strings.Builder, p post) {
 	builder.WriteString("+------------------------------------------+\n")
-	builder.WriteString(p.Content)
+	content := replaceLinks(p.Content)
+	builder.WriteString(content)
 	builder.WriteString("\n")
 	builder.WriteString(fmt.Sprintf("source: %s, id: %s...\n", p.Source, p.RemoteID[:10]))
 	builder.WriteString("+------------------------------------------+\n\n\n")
@@ -193,22 +217,24 @@ func drawPost(builder *strings.Builder, p post) {
 }
 
 // serveBlogIndex serves the main blog page with recent posts
-func (mb *MicroBlog) serveIndex(w gemini.ResponseWriter, req *gemini.Request) {
+func (mb *MicroBlog) serveIndex(w gemini.ResponseWriter, req *gemini.Request, pageNum int) {
 	w.WriteStatusMsg(gemini.StatusSuccess, "text/gemini")
 
 	var content strings.Builder
 	// content.WriteString("# Gemini Microblog\n\n")
 	// content.WriteString("Here are my microblog posts from various plantforms\n")
 	// Read and include the contents of ../../pages/microblog.gmi
-	page, err := os.ReadFile("./pages/microblog.gmi")
+	if pageNum == 1 {
-	if err != nil {
+		page, err := os.ReadFile("./pages/microblog.gmi")
-		slog.Error("Problem reading microblog page", "error", err)
+		if err != nil {
-		return
+			slog.Error("Problem reading microblog page", "error", err)
+			return
+		}
+		content.Write(page)
+		content.WriteString("\n")
 	}
-	content.Write(page)
-	content.WriteString("\n")
 
-	posts, err := mb.GetRecentPosts(20)
+	posts, err := mb.GetRecentPosts(20, pageNum)
 	if err != nil {
 		content.WriteString("Error fetching posts: " + err.Error() + "\n\n")
 	}
@@ -216,7 +242,7 @@ func (mb *MicroBlog) serveIndex(w gemini.ResponseWriter, req *gemini.Request) {
 	if len(posts) == 0 {
 		content.WriteString("No posts found.\n\n")
 	} else {
-		content.WriteString("## Recent Posts\n\n")
+		content.WriteString("## Posts\n\n")
 
 		for _, post := range posts {
 			drawPost(&content, post)
@@ -225,6 +251,8 @@ func (mb *MicroBlog) serveIndex(w gemini.ResponseWriter, req *gemini.Request) {
 
 	content.WriteString("## Nav\n\n")
 	// content.WriteString("=> /blog/new Write a new post\n")
+
+	content.WriteString(fmt.Sprintf("=> /microblog/page/%d Next page\n", pageNum+1))
 	content.WriteString("=> / Back to home\n")
 
 	w.WriteBody([]byte(content.String()))