public IEnumerable <Tuple <string[], DemoDetail[]> > GetDemosGroupedByFolder()
{
return(Demos
.GroupBy(
x => new DirectoryPath(baseDirectory, Path.GetDirectoryName(x.Path)),
y => y)
.OrderBy(x => x.Key.SplitPath.Length)
.Select(x => Tuple.Create(x.Key.SplitPath, x.ToArray())));
}