Add case check on case-insensitive systems in voicebank check

OpenUtau.Core/Classic/VoicebankErrorChecker.cs

@@ -101,20 +101,15 @@ public void Check() {
                     message = $"There are duplicate aliases.{message}"
                 });
             }
-            //Cross platform check
-            //Windows path is case insensitive, while MacOS path and Linux path are case sensitive.
-            //On Windows, check if the wave filename in oto.ini is the same as the filename in the file system.
-            if(OS.IsWindows()){
-                foreach(var otoSet in voicebank.OtoSets) {
-                    WindowsCaseCheck(otoSet);
-                }
-                WindowsCaseCheck(voicebank.BasePath, new string[]{
-                    "chatacter.txt", 
-                    "character.yaml", 
-                    "prefix.map",
-                    });
+            foreach(var otoSet in voicebank.OtoSets) {
+                CheckCaseMatchForFileReference(otoSet);
+                CheckDuplicatedNameIgnoringCase(otoSet);
             }
-            //TODO: On MacOS and Linux, check if there are files that have the same name but different case.
+            CheckCaseMatchForFileReference(voicebank.BasePath, new string[]{
+                "chatacter.txt", 
+                "character.yaml", 
+                "prefix.map",
+                });
         }
 
         bool TryGetFileDuration(string filePath, Oto oto, out double fileDuration) {
@@ -260,16 +255,16 @@ bool FindDuplication(out List<Oto> duplicates) {
         /// </summary>
         /// <param name="otoSet">otoSet to be checked</param>
         /// <returns></returns>
-        bool WindowsCaseCheck(OtoSet otoSet) {
-            return WindowsCaseCheck(
+        bool CheckCaseMatchForFileReference(OtoSet otoSet) {
+            return CheckCaseMatchForFileReference(
                 Directory.GetParent(otoSet.File).FullName, 
                 otoSet.Otos
                     .Select(oto => oto.Wav)
                     .Append(otoSet.File)//oto.ini itself
                     .ToHashSet());
         }
 
-        bool WindowsCaseCheck(string folder, IEnumerable<string> correctFileNames){
+        bool CheckCaseMatchForFileReference(string folder, IEnumerable<string> correctFileNames){
             bool valid = true;
             Dictionary<string, string> fileNamesLowerToActual = Directory.GetFiles(folder)
                 .Select(Path.GetFileName)
@@ -280,15 +275,36 @@ bool WindowsCaseCheck(string folder, IEnumerable<string> correctFileNames){
                 }
                 if (fileNamesLowerToActual[fileName.ToLower()] != fileName) {
                     valid = false;
-                    Infos.Add(new VoicebankError() {
+                    Errors.Add(new VoicebankError() {
                         message = $"Wrong case in file name: \n"
                             + $"expected: {Path.Join(folder,fileName)}\n"
                             + $"Actual: {Path.Join(folder,fileNamesLowerToActual[fileName.ToLower()])}\n"
-                            + $"voicebank may not work on another OS."
+                            + $"The voicebank may not work on another OS."
                     });
                 }
             }
             return valid;
         }
+
+        /// <summary>
+        /// Check if the file names are duplicated when converted to lower case.
+        /// </summary>
+        /// <param name="otoSet">otoSet to be checked</param>
+        /// <returns></returns>
+        bool CheckDuplicatedNameIgnoringCase(OtoSet otoSet) {
+            var wavNames = otoSet.Otos.Select(x => x.Wav).Distinct().ToList();
+            var duplicatedGroups = wavNames.GroupBy(x => x.ToLower())
+                .Where(group => group.Count() > 1)
+                .ToList();
+            foreach (var group in duplicatedGroups) {
+                Errors.Add(new VoicebankError() {
+                    message = $"Duplicated file names found when ignoreing case in oto set \"{otoSet.Name}\":"
+                    + string.Join(", ", group.Select(x => $"\"{x}\""))
+                    + ".\n"
+                    + "The voicebank may not work on another OS with case-sensitivity."
+                });
+            }
+            return duplicatedGroups.Count == 0;
+        }
     }
 }