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Packages/com.singularitygroup.hotreload/Editor/HotReloadSettingsEditor.cs

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+using System.IO;
+using UnityEditor;
+using UnityEngine;
+
+namespace SingularityGroup.HotReload.Editor {
+    static class HotReloadSettingsEditor {
+        /// Ensure settings asset file is created and saved
+        public static void EnsureSettingsCreated(HotReloadSettingsObject asset) {
+            if (!SettingsExists()) {
+                CreateNewSettingsFile(asset, HotReloadSettingsObject.editorAssetPath);
+            }
+        }
+
+        /// Load existing settings asset or return the default settings
+        public static HotReloadSettingsObject LoadSettingsOrDefault() {
+            if (SettingsExists()) {
+                return AssetDatabase.LoadAssetAtPath<HotReloadSettingsObject>(HotReloadSettingsObject.editorAssetPath);
+            } else {
+                // create an instance with default values
+                return ScriptableObject.CreateInstance<HotReloadSettingsObject>();
+            }
+        }
+
+        /// <summary>
+        /// Create settings asset file
+        /// </summary>
+        /// <remarks>Assume that settings asset doesn't exist yet</remarks>
+        /// <returns>The settings asset</returns>
+        static void CreateNewSettingsFile(HotReloadSettingsObject asset, string editorAssetPath) {
+            // create new settings asset
+            // ReSharper disable once AssignNullToNotNullAttribute
+            Directory.CreateDirectory(Path.GetDirectoryName(editorAssetPath));
+            if (asset == null) {
+                asset = ScriptableObject.CreateInstance<HotReloadSettingsObject>();
+            }
+            AssetDatabase.CreateAsset(asset, editorAssetPath);
+            // Saving the asset isn't needed right after you created it. Unity will save it at the appropriate time.
+            // Troy: I tested in Unity 2018 LTS, first Android build creates the asset file and asset is included in the build.
+        }
+
+        #region include/exclude in build
+
+        private static bool SettingsExists() {
+            return AssetExists(HotReloadSettingsObject.editorAssetPath);
+        }
+
+        private static bool AssetExists(string assetPath) {
+            return AssetDatabase.GetMainAssetTypeAtPath(assetPath) != null;
+        }
+
+        public static void AddOrRemoveFromBuild(bool includeSettingsInBuild) {
+            AssetDatabase.StartAssetEditing();
+            var so = LoadSettingsOrDefault();
+            try {
+                if (includeSettingsInBuild) {
+                    // Note: don't need to force create settings because we know the defaults in player.
+                    so.EnsurePrefabSetCorrectly();
+                    EnsureSettingsCreated(so);
+                } else {
+                    // this block shouldn't create the asset file, but it's also fine if it does
+                    so.EnsurePrefabNotInBuild();
+                }
+            } finally {
+                AssetDatabase.StopAssetEditing();
+            }
+        }
+
+        #endregion
+    }
+}