fix edge case where save constants aren't set correctly

docs/release-notes.md

@@ -11,6 +11,7 @@
 * For players:
   * Fixed error when running the Windows installer as administrator (thanks to LostLogic!).
   * Fixed `player_add` and `list_items` console commands not including some shirts _(in Console Commands)_.
+  * Fixed installer error on some older Windows systems (thanks to eddyballs!).
 
 * For mod authors:
   * Added `World.FurnitureListChanged` event (thanks to DiscipleOfEris!).
@@ -20,7 +21,7 @@
   * Fixed JSON schema for `i18n` files requiring the wrong value for the `$schema` field.
   * Fixed validation for mods with version `0.0.0`.
   * Fixed _loaded with custom settings_ trace log when using default settings.
-  * Fixed installer error on some older Windows systems (thanks to eddyballs!).
+  * Fixed `Constants.SaveFolderName` and `Constants.CurrentSavePath` not set correctly in rare cases.
 
 * For the web UI:
   * Updated the JSON validator/schema for Content Patcher 1.23.

src/SMAPI/Constants.cs

@@ -322,31 +322,42 @@ namespace StardewModdingAPI
         /// <summary>Get the name of the save folder, if any.</summary>
         private static string GetSaveFolderName()
         {
-            // save not available
+            return Constants.GetSaveFolder()?.Name;
-            if (Context.LoadStage == LoadStage.None)
-                return null;
-
-            // get basic info
-            string saveName = Game1.GetSaveGameName(set_value: false);
-            ulong saveID = Context.LoadStage == LoadStage.SaveParsed
-                ? SaveGame.loaded.uniqueIDForThisGame
-                : Game1.uniqueIDForThisGame;
-
-            // build folder name
-            return $"{new string(saveName.Where(char.IsLetterOrDigit).ToArray())}_{saveID}";
         }
 
         /// <summary>Get the path to the current save folder, if any.</summary>
         private static string GetSaveFolderPathIfExists()
         {
-            string folderName = Constants.GetSaveFolderName();
+            DirectoryInfo saveFolder = Constants.GetSaveFolder();
-            if (folderName == null)
+            return saveFolder?.Exists == true
+                ? saveFolder.FullName
+                : null;
+        }
+
+        /// <summary>Get the current save folder, if any.</summary>
+        private static DirectoryInfo GetSaveFolder()
+        {
+            // save not available
+            if (Context.LoadStage == LoadStage.None)
                 return null;
 
-            string path = Path.Combine(Constants.SavesPath, folderName);
+            // get basic info
-            return Directory.Exists(path)
+            string rawSaveName = Game1.GetSaveGameName(set_value: false);
-                ? path
+            ulong saveID = Context.LoadStage == LoadStage.SaveParsed
-                : null;
+                ? SaveGame.loaded.uniqueIDForThisGame
+                : Game1.uniqueIDForThisGame;
+
+            // get best match (accounting for rare case where folder name isn't sanitized)
+            DirectoryInfo folder = null;
+            foreach (string saveName in new[] { rawSaveName, new string(rawSaveName.Where(char.IsLetterOrDigit).ToArray()) })
+            {
+                folder = new DirectoryInfo(Path.Combine(Constants.SavesPath, $"{saveName}_{saveID}"));
+                if (folder.Exists)
+                    return folder;
+            }
+
+            // if save doesn't exist yet, return the default one we expect to be created
+            return folder;
         }
     }
 }