Fix prev pagination

service/service.go

@@ -207,10 +207,9 @@ func (svc *service) ServeTimelinePage(ctx context.Context, client io.Writer,
 	var nextLink, prevLink string
 
 	var pg = mastodon.Pagination{
-		MaxID:   maxID,
-		SinceID: sinceID,
-		MinID:   minID,
-		Limit:   20,
+		MaxID: maxID,
+		MinID: minID,
+		Limit: 20,
 	}
 
 	statuses, err := c.GetTimelineHome(ctx, &pg)
@@ -218,14 +217,31 @@ func (svc *service) ServeTimelinePage(ctx context.Context, client io.Writer,
 		return err
 	}
 
+	if len(maxID) > 0 && len(statuses) > 0 {
+		hasPrev = true
+		prevLink = fmt.Sprintf("/timeline?min_id=%s", statuses[0].ID)
+	}
+	if len(minID) > 0 && len(pg.MinID) > 0 {
+		newStatuses, err := c.GetTimelineHome(ctx, &mastodon.Pagination{MinID: pg.MinID, Limit: 20})
+		if err != nil {
+			return err
+		}
+		newStatusesLen := len(newStatuses)
+		if newStatusesLen == 20 {
+			hasPrev = true
+			prevLink = fmt.Sprintf("/timeline?min_id=%s", pg.MinID)
+		} else {
+			i := 20 - newStatusesLen - 1
+			if len(statuses) > i {
+				hasPrev = true
+				prevLink = fmt.Sprintf("/timeline?min_id=%s", statuses[i].ID)
+			}
+		}
+	}
 	if len(pg.MaxID) > 0 {
 		hasNext = true
 		nextLink = fmt.Sprintf("/timeline?max_id=%s", pg.MaxID)
 	}
-	if len(pg.SinceID) > 0 {
-		hasPrev = true
-		prevLink = fmt.Sprintf("/timeline?since_id=%s", pg.SinceID)
-	}
 
 	data := renderer.NewTimelinePageTemplateData(statuses, hasNext, nextLink, hasPrev, prevLink)
 	err = svc.renderer.RenderTimelinePage(ctx, client, data)

static/main.css

@@ -135,3 +135,11 @@
 	font-size: 11pt;
 	font-family: initial;
 }
+
+.pagination {
+	margin: 4px;
+}
+
+.pagination a {
+	margin: 0 8px;
+}

templates/timeline.tmpl

@@ -16,10 +16,12 @@
 {{template "status.tmpl" .}}
 {{end}}
 
-{{if .HasNext}}
-	<a href="{{.NextLink}}"> next </a>
-{{end}}
-{{if .HasPrev}}
-	<a href="{{.PrevLink}}"> next </a>
-{{end}}
+<div class="pagination">
+	{{if .HasPrev}}
+		<a href="{{.PrevLink}}">prev</a>
+	{{end}}
+	{{if .HasNext}}
+		<a href="{{.NextLink}}">next</a>
+	{{end}}
+</div>
 {{template "footer.tmpl"}}