/// <summary>
/// Copies all the files and directories from the source directory recursively into this directory.
/// </summary>
/// <param name="this">The destination directory.</param>
/// <param name="source">The source directory.</param>
/// <param name="overwrite">Whether or not to overwrite existing files.</param>
/// <returns>An enumerable of copied files.</returns>
public static async IAsyncEnumerable <IFile> CopyFromDirectory(this IDirectory @this, IReadOnlyDirectory source, bool overwrite)
{
if (@this == source)
{
yield break;
}
// Do the parent directory
foreach (var f in source.EnumerateFiles())
{
yield return(await @this.CopyFromAsync(f, overwrite));
}
var queuedDirs =
source.EnumerateDirectories()
.Select(d => (@this, d)).ToList();
// BFS over all the children.
Queue <(IDirectory, IReadOnlyDirectory)> dirsToProcess = new (queuedDirs);
while (dirsToProcess.Count > 0)
{
var(parent, src) = dirsToProcess.Dequeue();
var dst = parent.OpenDirectory(src.Name);
foreach (var f in src.EnumerateFiles())
{
yield return(await dst.CopyFromAsync(f, overwrite));
}
var children = src.EnumerateDirectories()
.Select(d => (dst, d)).ToList();
foreach (var childDirectory in children)
{
dirsToProcess.Enqueue(childDirectory);
}
}
}
