Replace the date format option with a locale option (#1130)

DiscordChatExporter.Gui/ViewModels/Components/DashboardViewModel.cs

@@ -78,6 +78,11 @@ public class DashboardViewModel : PropertyChangedBase
                 // due to the channels being asynchronously loaded.
                 AvailableChannels = null;
                 SelectedChannels = null;
+
+                // Pull channels for the selected guild
+                // (ideally this should be called inside `PullGuilds()`,
+                // but Stylet doesn't support async commands)
+                PullChannels();
             }
         );
     }
@@ -88,14 +93,14 @@ public class DashboardViewModel : PropertyChangedBase
             Token = _settingsService.LastToken;
     }
 
-    public async ValueTask ShowSettingsAsync() =>
+    public async void ShowSettings() =>
         await _dialogManager.ShowDialogAsync(_viewModelFactory.CreateSettingsViewModel());
 
     public void ShowHelp() => ProcessEx.StartShellExecute(App.DocumentationUrl);
 
-    public bool CanPullGuildsAsync => !IsBusy && !string.IsNullOrWhiteSpace(Token);
+    public bool CanPullGuilds => !IsBusy && !string.IsNullOrWhiteSpace(Token);
 
-    public async ValueTask PullGuildsAsync()
+    public async void PullGuilds()
     {
         IsBusy = true;
         var progress = _progressMuxer.CreateInput();
@@ -118,9 +123,6 @@ public class DashboardViewModel : PropertyChangedBase
 
             AvailableGuilds = guilds;
             SelectedGuild = guilds.FirstOrDefault();
-
-            // Pull channels for the selected guild
-            await PullChannelsAsync();
         }
         catch (DiscordChatExporterException ex) when (!ex.IsFatal)
         {
@@ -142,10 +144,9 @@ public class DashboardViewModel : PropertyChangedBase
         }
     }
 
-    public bool CanPullChannelsAsync =>
-        !IsBusy && _discord is not null && SelectedGuild is not null;
+    public bool CanPullChannels => !IsBusy && _discord is not null && SelectedGuild is not null;
 
-    public async ValueTask PullChannelsAsync()
+    public async void PullChannels()
     {
         IsBusy = true;
         var progress = _progressMuxer.CreateInput();
@@ -206,13 +207,13 @@ public class DashboardViewModel : PropertyChangedBase
         }
     }
 
-    public bool CanExportAsync =>
+    public bool CanExport =>
         !IsBusy
         && _discord is not null
         && SelectedGuild is not null
         && SelectedChannels?.Any() is true;
 
-    public async ValueTask ExportAsync()
+    public async void Export()
     {
         IsBusy = true;
 
@@ -267,7 +268,8 @@ public class DashboardViewModel : PropertyChangedBase
                             dialog.ShouldFormatMarkdown,
                             dialog.ShouldDownloadAssets,
                             dialog.ShouldReuseAssets,
-                            _settingsService.DateFormat
+                            _settingsService.Locale,
+                            _settingsService.IsUtcNormalizationEnabled
                         );
 
                         await exporter.ExportChannelAsync(request, progress, cancellationToken);

DiscordChatExporter.Gui/ViewModels/Dialogs/SettingsViewModel.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
 using DiscordChatExporter.Gui.Models;
 using DiscordChatExporter.Gui.Services;
 using DiscordChatExporter.Gui.ViewModels.Framework;
@@ -37,10 +39,52 @@ public class SettingsViewModel : DialogScreen
         set => _settingsService.ThreadInclusionMode = value;
     }
 
-    public string DateFormat
+    public IReadOnlyList<string> AvailableLocales { get; } = new[]
+        {
+            // Current locale
+            CultureInfo.CurrentCulture.Name,
+            // Locales supported by the Discord app
+            "da-DK",
+            "de-DE",
+            "en-GB",
+            "en-US",
+            "es-ES",
+            "fr-FR",
+            "hr-HR",
+            "it-IT",
+            "lt-LT",
+            "hu-HU",
+            "nl-NL",
+            "no-NO",
+            "pl-PL",
+            "pt-BR",
+            "ro-RO",
+            "fi-FI",
+            "sv-SE",
+            "vi-VN",
+            "tr-TR",
+            "cs-CZ",
+            "el-GR",
+            "bg-BG",
+            "ru-RU",
+            "uk-UA",
+            "th-TH",
+            "zh-CN",
+            "ja-JP",
+            "zh-TW",
+            "ko-KR"
+        }.Distinct(StringComparer.OrdinalIgnoreCase).ToArray();
+
+    public string Locale
     {
-        get => _settingsService.DateFormat;
-        set => _settingsService.DateFormat = value;
+        get => _settingsService.Locale;
+        set => _settingsService.Locale = value;
+    }
+
+    public bool IsUtcNormalizationEnabled
+    {
+        get => _settingsService.IsUtcNormalizationEnabled;
+        set => _settingsService.IsUtcNormalizationEnabled = value;
     }
 
     public int ParallelLimit