/// <summary>
/// Ensures that the higher directories iterate first before lower directories
/// </summary>
/// <param name="system">Filesystem to be run on</param>
/// <param name="path">Directory to start enumeration from</param>
/// <param name="includeSelf">Whether to include the starting directory in the return enumeration</param>
/// <param name="recursive">Whether to recursively enumerate subdirectories</param>
/// <returns>Enumerable of contained directories</returns>
public static IEnumerable <DirectoryPath> EnumerateDirectoryPaths(
this IDirectory system,
DirectoryPath path,
bool includeSelf,
bool recursive)
{
if (!system.Exists(path))
{
return(EnumerableExt <DirectoryPath> .Empty);
}
var ret = system.EnumerateDirectories(path)
.Select(x => new DirectoryPath(x));
if (recursive)
{
ret = ret
.Concat(system.EnumerateDirectories(path)
.SelectMany(d => system.EnumerateDirectoryPaths(d, includeSelf: false, recursive: true)));
}
if (includeSelf)
{
ret = path.AsEnumerable().Concat(ret);
}
return(ret);
}
