public Option <FilePath> ExportSpec(ICommandSpec spec, FolderPath root, FileExtension Extension, bool FlattenHierarchy)
{
var ext = Extension ?? ".spec";
var dstFolder = FlattenHierarchy ? root : root.GetCombinedFolderPath(spec.CommandName.Identifier.Split('/').Last());
dstFolder.CreateIfMissing().Require();
var path = dstFolder + (new FileName(spec.SpecName) + ext);
var json = serializer.Encode(spec);
File.WriteAllText(path, json);
return(path);
}