Support conditional include / exclude based on globs

Assets/Editor/SpriteAssistSettings.asset

@@ -17,10 +17,12 @@ MonoBehaviour:
   prefabRelativePath: 
   defaultTransparentShaderName: Unlit/Transparent
   defaultOpaqueShaderName: Unlit/Texture
-  defaultThickness: 0
   defaultTag: Untagged
   defaultLayer: 0
   defaultSortingLayerId: 0
   defaultSortingOrder: 0
   maxThumbnailPreviewCount: 10
   enableRenameMeshPrefabAutomatically: 0
+  inclusionMode: 0
+  inclusionGlobs:
+  - Example/Excluded/*

Assets/SpriteAssist/Editor/Import/SpritePostProcessor.cs

@@ -5,8 +5,11 @@ namespace SpriteAssist
 {
     public class SpritePostProcessor : AssetPostprocessor
     {
-        private void OnPostprocessSprites(Texture2D _, Sprite[] sprites)
+        private void OnPostprocessSprites(Texture2D tex, Sprite[] sprites)
         {
+            string path = AssetDatabase.GetAssetPath(tex);
+            if(!SpriteAssistSettings.instance.ShouldProcessSprite(path)) return;
+
             SpriteInspector.isSpriteReloaded = true;
 
             TextureImporter textureImporter = assetImporter as TextureImporter;

Assets/SpriteAssist/Editor/Inspector/SpriteInspector.cs

@@ -21,21 +21,32 @@ public class SpriteInspector : UnityInternalEditor<Sprite>
         protected override void OnEnable()
         {
             base.OnEnable();
-
-            SetSpriteProcessor(target, AssetDatabase.GetAssetPath(target));
-            AssemblyReloadEvents.afterAssemblyReload += OnAfterAssemblyReload;
+            if(SpriteAssistSettings.instance.ShouldProcessSprite(target as Sprite))
+            {
+                SetSpriteProcessor(target, AssetDatabase.GetAssetPath(target));
+                AssemblyReloadEvents.afterAssemblyReload += OnAfterAssemblyReload;
+            }
         }
 
         protected override void OnDisable()
         {
             base.OnDisable();
 
-            SpriteProcessor?.Dispose();
-            AssemblyReloadEvents.afterAssemblyReload -= OnAfterAssemblyReload;
+            if(SpriteProcessor != null)
+            {
+                SpriteProcessor?.Dispose();
+                AssemblyReloadEvents.afterAssemblyReload -= OnAfterAssemblyReload;
+            }
         }
 
         public override void OnInspectorGUI()
         {
+            if(SpriteProcessor == null)
+            {
+                base.OnInspectorGUI();
+                return;
+            }
+
             using (new EditorGUI.DisabledGroupScope(Application.isPlaying))
             {
                 using (var scroll = new EditorGUILayout.ScrollViewScope(_scrollPosition))
@@ -58,7 +69,7 @@ public override void OnPreviewGUI(Rect rect, GUIStyle background)
             base.OnPreviewGUI(rect, background);
 
             Sprite sprite = target as Sprite;
-            if (sprite == null)
+            if (SpriteProcessor == null || sprite == null)
             {
                 return;
             }

Assets/SpriteAssist/Editor/Settings/SpriteAssistInclusionMode.cs

@@ -0,0 +1,22 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace SpriteAssist
+{
+    /// <summary>
+    /// The include/exclude mode for SpriteAssist.
+    /// </summary>
+    public enum SpriteAssistInclusionMode
+    {
+        /// <summary>
+        /// All sprites except those listed in settings will be processed
+        /// </summary>
+        Exclude,
+
+        /// <summary>
+        /// Only sprites explicitly matched by those in settings will be processed
+        /// </summary>
+        Include
+    }
+}

Assets/SpriteAssist/Editor/Settings/SpriteAssistSettings.cs

@@ -1,8 +1,11 @@
-using UnityEditor;
+using System.Collections.Generic;
+using System.Text.RegularExpressions;
+using UnityEditor;
+using UnityEngine;
 
 namespace SpriteAssist
 {
-    [FilePath(SETTINGS_PATH, FilePathAttribute.Location.PreferencesFolder)]
+    [FilePath(SETTINGS_PATH, FilePathAttribute.Location.ProjectFolder)]
     public class SpriteAssistSettings : ScriptableSingleton<SpriteAssistSettings>
     {
         private const string SETTINGS_PATH = "Assets/Editor/SpriteAssistSettings.asset";
@@ -27,5 +30,77 @@ public class SpriteAssistSettings : ScriptableSingleton<SpriteAssistSettings>
         public int maxThumbnailPreviewCount = THUMBNAIL_COUNT;
 
         public bool enableRenameMeshPrefabAutomatically;
+
+        [Tooltip("Controls if sprites are automatically or explicitly marked for processing")]
+        public SpriteAssistInclusionMode inclusionMode;
+
+        [Tooltip("Pattern matching globs to describe included/excluded files. All relative to Assets/.")]
+        public string[] inclusionGlobs = {};
+
+        protected Dictionary<string,Regex> compiledRegexes = new Dictionary<string, Regex>();
+
+        public bool ShouldProcessSprite(Sprite s)
+        {
+            if(s == null)
+            {
+                return false;
+            }
+            string path = AssetDatabase.GetAssetPath(s);
+            return ShouldProcessSprite(path);
+        }
+
+        public bool ShouldProcessSprite(string path)
+        {
+            if(string.IsNullOrEmpty(path) || !path.StartsWith("Assets"))
+            {
+                return false;
+            }
+
+            foreach(string glob in inclusionGlobs)
+            {
+                Regex r = GetRegex(glob);
+                if(r.IsMatch(path))
+                {
+                    // Debug.Log($"[SpriteAssistSettings] {path} matches {glob}!");
+                    // return true if explicit inclusion is selected, otherwise false for explicit exclusion
+                    return inclusionMode == SpriteAssistInclusionMode.Include;
+                }
+                else
+                {
+                    // Debug.Log($"[SpriteAssistSettings] {path} does not match {glob}");
+                }
+            }
+            // fallthru: return true if "include by default", otherwise false
+            // Debug.Log($"[SpriteAssistSettings] No match for {path} found");
+            return inclusionMode == SpriteAssistInclusionMode.Exclude;
+        }
+
+        protected void OnValidate()
+        {
+            // we don't have granular information to decide if the globs have updated
+            // so just blow these away
+            compiledRegexes.Clear();
+        }
+
+        private Regex GetRegex(string glob)
+        {
+            Regex result = null;
+            if(!compiledRegexes.TryGetValue(glob, out result))
+            {
+                result = CompileGlob(glob);
+                compiledRegexes.Add(glob, result);
+            }
+            return result;
+        }
+
+        private Regex CompileGlob(string glob)
+        {
+            glob = "Assets/" + glob;
+            // Debug.Log($"[SpriteAssistSettings] compiling `${glob}`");
+            return new Regex(
+                "^" + Regex.Escape(glob).Replace(@"\*", ".*").Replace(@"\?", ".") + "$",
+                RegexOptions.IgnoreCase | RegexOptions.Singleline | RegexOptions.Compiled
+            );
+        }
     }
-}
+}