internal static IEnumerable <Object> DuplicateAssets(IEnumerable <Object> assets)
{
AssetDatabase.Refresh();
var copiedPaths = new List <string>();
Object firstDuplicatedObjectToFail = null;
foreach (var asset in assets)
{
var assetPath = AssetDatabase.GetAssetPath(asset);
// if duplicating a sub-asset, then create a copy next to the main asset file
if (!String.IsNullOrEmpty(assetPath) && AssetDatabase.IsSubAsset(asset))
{
if (asset is ISubAssetNotDuplicatable)
{
firstDuplicatedObjectToFail = firstDuplicatedObjectToFail ? firstDuplicatedObjectToFail : asset;
continue;
}
var extension = NativeFormatImporterUtility.GetExtensionForAsset(asset);
// We dot sanitize or block unclean the asset filename (asset.name)
// since the assertdb will do it for us and has a whole tailored logic for that.
// It feels wrong that the asset name (that can apparently contain any char)
// is conflated with the orthogonal notion of filename. From the user's POV
// it will force an asset dup but with mangled names if the original name contained
// "invalid chars" for filenames.
// Path.Combine is not used here to avoid blocking asset names that might
// contain chars not allowed in filenames.
if ((new HashSet <char>(Path.GetInvalidFileNameChars())).Intersect(asset.name).Count() != 0)
{
Debug.LogWarning(string.Format("Duplicated asset name '{0}' contains invalid characters. Those will be replaced in the duplicated asset name.", asset.name));
}
var newPath = AssetDatabase.GenerateUniqueAssetPath(
string.Format("{0}{1}{2}.{3}",
Path.GetDirectoryName(assetPath),
Path.DirectorySeparatorChar,
asset.name,
extension)
);
AssetDatabase.CreateAsset(Object.Instantiate(asset), newPath);
copiedPaths.Add(newPath);
}
// otherwise duplicate the main asset file
else if (EditorUtility.IsPersistent(asset))
{
var newPath = AssetDatabase.GenerateUniqueAssetPath(assetPath);
if (newPath.Length > 0 && AssetDatabase.CopyAsset(assetPath, newPath))
{
copiedPaths.Add(newPath);
}
}
}
if (firstDuplicatedObjectToFail != null)
{
var errString = string.Format(
"Duplication error: One or more sub assets (with types of {0}) can not be duplicated directly, use the appropriate editor instead",
firstDuplicatedObjectToFail.GetType().Name
);
Debug.LogError(errString, firstDuplicatedObjectToFail);
}
AssetDatabase.Refresh();
return(copiedPaths.Select(AssetDatabase.LoadMainAssetAtPath));
}