/// <summary>
/// Copies a directory from a source filesystem to a destination filesystem and folder.
/// </summary>
/// <param name="fs">The source filesystem.</param>
/// <param name="srcFolder">The source folder.</param>
/// <param name="destFileSystem">The destination filesystem.</param>
/// <param name="dstFolder">The destination folder in the destination filesystem.</param>
/// <param name="overwrite"><c>true</c> to overwrite files.</param>
public static void CopyDirectory(this IFileSystem fs, UPath srcFolder, IFileSystem destFileSystem, UPath dstFolder, bool overwrite)
{
if (destFileSystem is null)
{
throw new ArgumentNullException(nameof(destFileSystem));
}
if (!fs.DirectoryExists(srcFolder))
{
throw new DirectoryNotFoundException($"{srcFolder} folder not found from source file system.");
}
if (dstFolder != UPath.Root)
{
destFileSystem.CreateDirectory(dstFolder);
}
var srcFolderFullName = srcFolder.FullName;
int deltaSubString = srcFolder == UPath.Root ? 0 : 1;
// Copy the files for the folder
foreach (var file in fs.EnumerateFiles(srcFolder))
{
var relativeFile = file.FullName.Substring(srcFolderFullName.Length + deltaSubString);
var destFile = UPath.Combine(dstFolder, relativeFile);
fs.CopyFileCross(file, destFileSystem, destFile, overwrite);
}
// Then copy the folder structure recursively
foreach (var srcSubFolder in fs.EnumerateDirectories(srcFolder))
{
var relativeDestFolder = srcSubFolder.FullName.Substring(srcFolderFullName.Length + deltaSubString);
var destSubFolder = UPath.Combine(dstFolder, relativeDestFolder);
CopyDirectory(fs, srcSubFolder, destFileSystem, destSubFolder, overwrite);
}
}
