use pttodo.NewRootFromFiles in cli

cmd/dump.go

@@ -15,18 +15,10 @@ func dump(config config) error {
 }
 
 func _dump(writer io.Writer, filepaths []string, tags []string, search, rootDisplay string) error {
-	var root pttodo.Root
-
-	for _, filepath := range filepaths {
-		subroot, err := pttodo.NewRootFromFile(filepath)
+	root, err := pttodo.NewRootFromFiles(filepaths...)
 	if err != nil {
 		return err
 	}
-		subroot.MoveScheduledToTodo()
-		root.MergeIn(subroot)
-	}
-
-	root.MoveScheduledToTodo()
 
 	var v interface{} = root
 	switch rootDisplay {