static public IFileStoreWriter WithMappedPath(
this IFileStoreWriter originalFileStore, System.Func <IImmutableList <string>, IImmutableList <string> > pathMap) =>
new DelegatingFileStoreWriter
{
SetFileContentDelegate = pathAndFileContent => originalFileStore.SetFileContent(pathMap(pathAndFileContent.path), pathAndFileContent.fileContent),
AppendFileContentDelegate = pathAndFileContent => originalFileStore.AppendFileContent(pathMap(pathAndFileContent.path), pathAndFileContent.fileContent),
DeleteFileDelegate = originalPath => originalFileStore.DeleteFile(pathMap(originalPath)),
};
public void DeleteFile(IImmutableList <string> path) => writer.DeleteFile(path);