Timeline bugfix (#60)

* fix a stack overflow in the timeline

* go fmt

internal/timeline/index.go

@@ -10,6 +10,45 @@ import (
 )
 
 func (t *timeline) IndexBefore(statusID string, include bool, amount int) error {
+	filtered := []*gtsmodel.Status{}
+	offsetStatus := statusID
+
+	if include {
+		s := &gtsmodel.Status{}
+		if err := t.db.GetByID(statusID, s); err != nil {
+			return fmt.Errorf("IndexBefore: error getting initial status with id %s: %s", statusID, err)
+		}
+		filtered = append(filtered, s)
+	}
+
+grabloop:
+	for len(filtered) < amount {
+		statuses, err := t.db.GetStatusesWhereFollowing(t.accountID, "", offsetStatus, "", amount, false)
+		if err != nil {
+			if _, ok := err.(db.ErrNoEntries); ok {
+				break grabloop // we just don't have enough statuses left in the db so index what we've got and then bail
+			}
+			return fmt.Errorf("IndexBefore: error getting statuses from db: %s", err)
+		}
+
+		for _, s := range statuses {
+			timelineable, err := t.filter.StatusHometimelineable(s, t.account)
+			if err != nil {
+				continue
+			}
+			if timelineable {
+				filtered = append(filtered, s)
+			}
+			offsetStatus = s.ID
+		}
+	}
+
+	for _, s := range filtered {
+		if _, err := t.IndexOne(s.CreatedAt, s.ID, s.BoostOfID); err != nil {
+			return fmt.Errorf("IndexBefore: error indexing status with id %s: %s", s.ID, err)
+		}
+	}
+
 	return nil
 }
 
@@ -41,7 +80,7 @@ grabloop:
 
 	for _, s := range filtered {
 		if _, err := t.IndexOne(s.CreatedAt, s.ID, s.BoostOfID); err != nil {
-			return fmt.Errorf("IndexBehindAndIncluding: error indexing status with id %s: %s", s.ID, err)
+			return fmt.Errorf("IndexBehind: error indexing status with id %s: %s", s.ID, err)
 		}
 	}