ScriptableRenderPipeline/UnityProject/Assets/Editor/Material/AssetCallbacks/CreateShaderSubGraph.cs

using System.IO;

namespace UnityEditor.Graphs.Material
{
	public class CreateShaderSubGraph : EndNameEditActionCallback
	{
		[MenuItem("Assets/Create/Shader Sub-Graph", false, 209)]
		public static void CreateMaterialSubGraph()
		{
			ProjectWindowUtil.StartNameEditingIfProjectWindowExists(0, CreateInstance<CreateShaderSubGraph>(),
																	"New Shader SubGraph.ShaderSubGraph", null, null);
		}

		public override void Action(int instanceId, string pathName, string resourceFile)
		{
			var graph = CreateInstance<MaterialSubGraph>();
			graph.name = Path.GetFileName(pathName);
			AssetDatabase.CreateAsset(graph, pathName);
			graph.CreateSubAssets();
		}
	}
}