X-Git-Url: https://git.giacomolli.uk/onechat/blobdiff_plain/d8f3785bb69288663f4cc46bf4d609c6770452d5..e86df5fad9aa2f280aad845adeefd239b0e944ae:/view.go

diff --git a/view.go b/view.go
index 4a6e567..9af1c21 100644
--- a/view.go
+++ b/view.go
@@ -88,13 +88,18 @@ func (v *View) Append(tree ViewNodeReader) (bool, error) {
 	line := NodeKey{0, v.end}
 	_, err := v.load(tree, line)
 	if err != nil {
-		return false, err
+		return false, fmt.Errorf("load appended leaf: %w", err)
 	}
 
 	v.lines = append(v.lines, line)
 	v.end++
 
-	return v.fit(tree)
+	merged, err := v.fit(tree)
+	if err != nil {
+		return merged, fmt.Errorf("fit appended view: %w", err)
+	}
+
+	return merged, nil
 }
 
 // load keeps the node of line when it is built, and tells if it is.
@@ -121,14 +126,18 @@ func (v *View) fit(tree ViewNodeReader) (bool, error) {
 	for v.merging && size > v.low {
 		best, err := v.mostDue(tree)
 		if err != nil || best < 0 {
-			return merged, err
+			if err != nil {
+				return merged, fmt.Errorf("choose merge candidate: %w", err)
+			}
+
+			return merged, nil
 		}
 
 		left, right := v.lines[best], v.lines[best+1]
 		parent := NodeKey{left.level + 1, left.index / 2}
 		_, err = v.load(tree, parent)
 		if err != nil {
-			return merged, err
+			return merged, fmt.Errorf("load merged parent: %w", err)
 		}
 
 		size += v.lineSize(parent) - v.lineSize(left) - v.lineSize(right)
@@ -341,7 +350,7 @@ func restoreView(state ViewState, high, low int, tree ViewNodeReader) (*View, er
 
 		built, err := v.load(tree, line)
 		if err != nil {
-			return nil, err
+			return nil, fmt.Errorf("load restored view node: %w", err)
 		}
 
 		if line.level > 0 && !built {