pcloud: add ListP interface - #4788

backend/pcloud/pcloud.go

@@ -629,11 +629,31 @@ func (f *Fs) listHelper(ctx context.Context, dir string, recursive bool, callbac
 // This should return ErrDirNotFound if the directory isn't
 // found.
 func (f *Fs) List(ctx context.Context, dir string) (entries fs.DirEntries, err error) {
+	return list.WithListP(ctx, dir, f)
+}
+
+// ListP lists the objects and directories of the Fs starting
+// from dir non recursively into out.
+//
+// dir should be "" to start from the root, and should not
+// have trailing slashes.
+//
+// This should return ErrDirNotFound if the directory isn't
+// found.
+//
+// It should call callback for each tranche of entries read.
+// These need not be returned in any particular order.  If
+// callback returns an error then the listing will stop
+// immediately.
+func (f *Fs) ListP(ctx context.Context, dir string, callback fs.ListRCallback) (err error) {
+	list := list.NewHelper(callback)
 	err = f.listHelper(ctx, dir, false, func(o fs.DirEntry) error {
-		entries = append(entries, o)
+		return list.Add(o)
-		return nil
 	})
-	return entries, err
+	if err != nil {
+		return err
+	}
+	return list.Flush()
 }
 
 // ListR lists the objects and directories of the Fs starting
@@ -1377,6 +1397,8 @@ var (
 	_ fs.DirMover        = (*Fs)(nil)
 	_ fs.DirCacheFlusher = (*Fs)(nil)
 	_ fs.PublicLinker    = (*Fs)(nil)
+	_ fs.ListRer         = (*Fs)(nil)
+	_ fs.ListPer         = (*Fs)(nil)
 	_ fs.Abouter         = (*Fs)(nil)
 	_ fs.Shutdowner      = (*Fs)(nil)
 	_ fs.Object          = (*Object)(nil)