baseline: OpenMU upstream b5a0961 (fresh source)

src/DataModel/CultureHelper.cs

@@ -0,0 +1,57 @@
+// <copyright file="CultureHelper.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.DataModel;
+
+using System.Globalization;
+using System.Resources;
+using Nito.Disposables;
+using Nito.Disposables.Internals;
+
+/// <summary>
+/// Helper class for culture related operations.
+/// </summary>
+public static class CultureHelper
+{
+    /// <summary>
+    /// Sets the temporary culture for the current thread.
+    /// Should be disposed after usage to revert to the previous culture.
+    /// Should not be used between async calls.
+    /// </summary>
+    /// <param name="cultureInfo">The culture information.</param>
+    /// <returns>A disposable to revert to the previous culture.</returns>
+    public static IDisposable SetTemporaryCulture(CultureInfo cultureInfo)
+    {
+        var oldUiCulture = CultureInfo.CurrentUICulture;
+        var oldCulture = CultureInfo.CurrentCulture;
+        CultureInfo.CurrentUICulture = cultureInfo;
+        CultureInfo.CurrentCulture = cultureInfo;
+
+        return Disposable.Create(() =>
+        {
+            CultureInfo.CurrentUICulture = oldUiCulture;
+            CultureInfo.CurrentCulture = oldCulture;
+        });
+    }
+
+    /// <summary>
+    /// Gets the available cultures for a specific resource.
+    /// </summary>
+    /// <typeparam name="TResources">The type of the resources.</typeparam>
+    /// <returns>An enumeration of <see cref="CultureInfo.TwoLetterISOLanguageName"/> of available cultures of the given resource type.</returns>
+    public static IEnumerable<CultureInfo> GetAvailableCultures<TResources>()
+    {
+        var resourceManager = new ResourceManager(typeof(TResources));
+
+        var cultures = CultureInfo.GetCultures(CultureTypes.AllCultures);
+        var result = cultures
+            .Except([CultureInfo.InvariantCulture])
+            .Where(culture => culture is { IsNeutralCulture: true, TwoLetterISOLanguageName: "en" }
+                              || !object.Equals(resourceManager.GetResourceSet(culture, true, false), null))
+            .WhereNotNull()
+            .ToList();
+
+        return result;
+    }
+}