【Unity AssetGraph】Add load ignoresettings with custom menu

readme.md

【Unity】AssetGraphのLoadノードにおいてファイルやフォルダを無視する設定を追加できるカスタムメニュー

※簡単に追加できると思ったら非公開フィールドだったため、reflectionの練習がてら書いてみた

フォルダやアセットを選択して右クリックでメニューを実行するとLoadノードにファイル名やディレクトリ名が保存される（※AssetGraphのRefreshボタンを押す必要がある）

AssetGraphIgnorer.cs

using System;
using System.Collections;
using System.IO;
using System.Reflection;
using UnityEditor;
using UnityEngine;
using UnityEngine.AssetGraph;
using UnityEngine.AssetGraph.DataModel.Version2;

public class AssetGraphIgnorer
{
    private static string s_ignorePatternTypeName = "UnityEngine.AssetGraph.Loader+IgnorePattern";
    private static string s_fileTypeMaskTypeName = "UnityEngine.AssetGraph.Loader+IgnorePattern+FileTypeMask";
    private static string s_ignorePatternsFieldName = "m_ignorePatterns";
    private static string s_loadNodeCategoryName = "Load";


    [MenuItem("Assets/Ignore AssetPostprocessor")]
    private static void SetAsIgnoreAsset()
    {
        var guids = AssetDatabase.FindAssets("t:ConfigGraph", new[] { "Assets" });
        if (guids.Length != 1)
        {
            return;
        }

        if (Selection.activeObject == null)
        {
            Debug.LogWarning("Please select file or folder.");
            return;
        }

        var graphAsset = AssetDatabase.LoadAssetAtPath<ConfigGraph>(AssetDatabase.GUIDToAssetPath(guids[0]));

        foreach (var node in graphAsset.Nodes)
        {
            if (node.Operation.Object.Category.Equals(s_loadNodeCategoryName))
            {
                Loader loader = node.Operation.Object as Loader;
                FieldInfo[] fields = typeof(Loader).GetFields(BindingFlags.NonPublic | BindingFlags.Instance);
                foreach (var field in fields)
                {
                    if (field.Name.Equals(s_ignorePatternsFieldName))
                    {
                        var listObj = (IList)field.GetValue(loader);
                        var path = AssetDatabase.GetAssetPath(Selection.activeObject);
                        var fileName = Path.GetFileName(path);
                        var ignorePattern = CreateIgnorePattern(fileName, IsFolderSelected());
                        listObj.Add(ignorePattern);
                        field.SetValue(loader, listObj);
                    }
                }
            }
        }
        graphAsset.Save();
    }

    private static object CreateIgnorePattern(string pattern, bool isFolder)
    {
        var assembly = Assembly.GetAssembly(typeof(Loader));
        var ignorePatternType = assembly.GetType(s_ignorePatternTypeName);

        var enumType = assembly.GetType(s_fileTypeMaskTypeName);
        object enumInstance = Enum.ToObject(enumType, isFolder ? 2 : 1);
        var ignorePattern = ignorePatternType.GetConstructor(new [] {enumType, typeof(string)})?.Invoke(new [] {enumInstance, pattern});

        return ignorePattern;
    }

    private static bool IsFolderSelected()
    {
        var obj = Selection.activeObject;
        string path = obj == null ? "Assets" : AssetDatabase.GetAssetPath(obj.GetInstanceID());

        if (path.Length > 0)
        {
            if (Directory.Exists(path))
            {
                return true;
            }
            return false;
        }

        return false;
    }
}