Use placeholder svg

diary.go

@@ -401,20 +401,36 @@ func renderDiaryYear(fsPath, urlPath string) template.HTML {
 
 	photos := yearPhotos(fsPath, urlPath)
 
-	entries, err := os.ReadDir(fsPath)
-	if err != nil {
-		return ""
-	}
-
-	var months []diaryMonthSummary
+	// Collect month numbers from both subdirectories and photo filenames so
+	// years that contain only photos (no diary entries) still list months.
+	monthSet := map[int]bool{}
+	monthDirs := map[int]string{}
+	entries, _ := os.ReadDir(fsPath)
 	for _, e := range entries {
 		if !e.IsDir() {
 			continue
 		}
-		monthNum, err := strconv.Atoi(e.Name())
-		if err != nil || monthNum < 1 || monthNum > 12 {
+		n, err := strconv.Atoi(e.Name())
+		if err != nil || n < 1 || n > 12 {
 			continue
 		}
+		monthSet[n] = true
+		monthDirs[n] = e.Name()
+	}
+	for _, p := range photos {
+		if p.Date.Year() == year {
+			monthSet[int(p.Date.Month())] = true
+		}
+	}
+
+	monthNums := make([]int, 0, len(monthSet))
+	for m := range monthSet {
+		monthNums = append(monthNums, m)
+	}
+	sort.Ints(monthNums)
+
+	var months []diaryMonthSummary
+	for _, monthNum := range monthNums {
 		var monthPhotos []diaryPhoto
 		for _, p := range photos {
 			if p.Date.Year() == year && int(p.Date.Month()) == monthNum {
@@ -422,10 +438,14 @@ func renderDiaryYear(fsPath, urlPath string) template.HTML {
 			}
 		}
 		monthDate := time.Date(year, time.Month(monthNum), 1, 0, 0, 0, 0, time.UTC)
+		dirName, ok := monthDirs[monthNum]
+		if !ok {
+			dirName = fmt.Sprintf("%02d", monthNum)
+		}
 		months = append(months, diaryMonthSummary{
 			ID:     monthDate.Format("2006-01"),
 			Name:   fmt.Sprintf("%s %d", germanMonths[monthDate.Month()], year),
-			URL:    path.Join(urlPath, e.Name()) + "/",
+			URL:    path.Join(urlPath, dirName) + "/",
 			Photos: monthPhotos,
 		})
 	}