findDirectory :: BuildMaps -> FilePath -> DirectoryBuildMap
findDirectory (BuildMaps _ childrenMap) path =
  M.findWithDefault mempty path childrenMap
findDirectory :: BuildMaps -> FilePath -> DirectoryBuildMap
findDirectory (BuildMaps _ childrenMap) path =
  M.findWithDefault mempty path childrenMap
findDirectory (BuildMaps _ childrenMap) path =
  M.findWithDefault mempty path childrenMap