simplify solution

this also makes sure that we don't skip over any available numbers

Author: vkovec

Assets/FbxExporters/Editor/ConvertToModel.cs

@@ -77,10 +77,11 @@ private static List<GameObject> OnConvertInPlace (GameObject [] unityActiveGOs)
 
                 for(int n = 0; n < gosToExport.Length; n++){
                     var filename = gosToExport [n].name + ".fbx";
-                    if (File.Exists (Path.Combine(dirPath, filename))) {
-                        filename = IncrementFileName (dirPath, filename);
+                    var filePath = Path.Combine (dirPath, filename);
+                    if (File.Exists (filePath)) {
+                        filePath = IncrementFileName (dirPath, filename);
                     }
-                    filePaths[n] = Path.Combine (dirPath, filename);
+                    filePaths[n] = filePath;
                 }
 
                 string[] fbxFileNames = new string[filePaths.Length];
@@ -142,33 +143,24 @@ private static List<GameObject> OnConvertInPlace (GameObject [] unityActiveGOs)
 
             /// <summary>
             /// Check if the file exists, and if it does, then increment the name.
-            /// e.g. if filename is Sphere.fbx and it already exists, change it to Sphere1.fbx.
+            /// e.g. if filename is Sphere.fbx and it already exists, change it to Sphere 1.fbx.
             /// </summary>
             /// <returns>new file name.</returns>
             /// <param name="filename">Filename.</param>
             private static string IncrementFileName(string path, string filename)
             {
                 string fileWithoutExt = Path.GetFileNameWithoutExtension (filename);
                 string ext = Path.GetExtension (filename);
-                string pattern = string.Format (@"{0}{1}{2}", fileWithoutExt, "*", ext);
-                string[] files = Directory.GetFiles (path, pattern, SearchOption.TopDirectoryOnly);
-
-                int index = 0;
-                string groupName = "index";
-                pattern = string.Format (@"{0}{1}\{2}", fileWithoutExt, "[ ]*(?<"+groupName+">[0-9]*?)", ext);
-                foreach (var file in files) {
-                    var match = System.Text.RegularExpressions.Regex.Match (file, pattern);
-                    if (match.Success) {
-                        string indexMatch = match.Groups [groupName].Value;
-                        if (!string.IsNullOrEmpty(indexMatch)) {
-                            int i = -1;
-                            if (int.TryParse (indexMatch, out i) && i > index) {
-                                index = i;
-                            }
-                        }
-                    }
-                }
-                return string.Format ("{0} {1}{2}", fileWithoutExt, (index + 1), ext);
+
+                int index = 1;
+                string file = null;
+                do {
+                    file = string.Format ("{0} {1}{2}", fileWithoutExt, index, ext);
+                    file = Path.Combine(path, file);
+                    index++;
+                } while (File.Exists (file));
+
+                return file;
             } 
 
             private static void SetupImportedGameObject(GameObject orig, GameObject imported)