improved list performance (1000 posts -> 118ms). #5

user.go

@@ -65,24 +65,31 @@ func (user User) Posts() ([]Post, error) {
 		}
 	}
 
-	// sort posts by date
+	type PostWithDate struct {
-	sort.Slice(posts, func(i, j int) bool {
+		post Post
-		_, markdownData_i := posts[i].MarkdownData()
+		date time.Time
-		_, markdownData_j := posts[j].MarkdownData()
+	}
 
-		date_i, err := time.Parse(time.RFC1123Z, markdownData_i.Date)
+	postDates := make([]PostWithDate, len(posts))
+	for i, post := range posts {
+		_, meta := post.MarkdownData()
+		date, err := time.Parse(time.RFC1123Z, meta.Date)
 		if err != nil {
 			// invalid date -> use 1970-01-01
-			date_i = time.Time{}
+			date = time.Time{}
 		}
-		date_j, err := time.Parse(time.RFC1123Z, markdownData_j.Date)
+		postDates[i] = PostWithDate{post: post, date: date}
-		if err != nil {
-			// invalid date -> use 1970-01-01
-			date_j = time.Time{}
 	}
-		return date_i.After(date_j)
+
+	// sort posts by date
+	sort.Slice(postDates, func(i, j int) bool {
+		return postDates[i].date.After(postDates[j].date)
 	})
 
+	for i, post := range postDates {
+		posts[i] = post.post
+	}
+
 	return posts, nil
 }
 

user_test.go

@@ -202,6 +202,29 @@ func TestPostsSortedByPublishingDateLatestFirst(t *testing.T) {
 	}
 }
 
+func TestPostsSortedByPublishingDateLatestFirst2(t *testing.T) {
+	user := getTestUser()
+	// Create a new post
+	posts := []*owl.Post{}
+	for i := 59; i >= 0; i-- {
+		post, _ := user.CreateNewPost("testpost")
+		content := "---\n"
+		content += "title: Test Post\n"
+		content += fmt.Sprintf("date: Wed, 17 Aug 2022 10:%02d:02 +0000\n", i)
+		content += "---\n"
+		content += "This is a test"
+		os.WriteFile(post.ContentFile(), []byte(content), 0644)
+		posts = append(posts, &post)
+	}
+
+	retPosts, _ := user.Posts()
+	for i, p := range retPosts {
+		if p.Id() != posts[i].Id() {
+			t.Error("Wrong Id, Got: " + p.Id())
+		}
+	}
+}
+
 func TestPostsSortedByPublishingDateBrokenAtBottom(t *testing.T) {
 	user := getTestUser()
 	// Create a new post