ux: Add default terminal settings UI.

src/Resources/Locales/en_US.axaml

@@ -254,6 +254,14 @@
   <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">Theme</x:String>
   <x:String x:Key="Text.Preference.General" xml:space="preserve">GENERAL</x:String>
   <x:String x:Key="Text.Preference.General.AvatarServer" xml:space="preserve">Avatar Server</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminal" xml:space="preserve">Default Terminal/Shell</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminalOrShell.wt" xml:space="preserve">Windows Terminal</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminalOrShell.git-bash" xml:space="preserve">Git Bash (Shell)</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminalOrShell.pwsh" xml:space="preserve">PowerShell (Shell)</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminalOrShell.gnome" xml:space="preserve">Gnome</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminalOrShell.konsole" xml:space="preserve">Konsole</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminalOrShell.osascript" xml:space="preserve">AppleScript</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminalOrShell.xfce4" xml:space="preserve">xfce4</x:String>
   <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">Check for updates on startup</x:String>
   <x:String x:Key="Text.Preference.General.Locale" xml:space="preserve">Language</x:String>
   <x:String x:Key="Text.Preference.General.MaxHistoryCommits" xml:space="preserve">History Commits</x:String>

src/Resources/Locales/zh_CN.axaml

@@ -254,6 +254,14 @@
   <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">主题</x:String>
   <x:String x:Key="Text.Preference.General" xml:space="preserve">通用配置</x:String>
   <x:String x:Key="Text.Preference.General.AvatarServer" xml:space="preserve">头像服务</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminal" xml:space="preserve">默认终端</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminalOrShell.wt" xml:space="preserve">终端</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminalOrShell.git-bash" xml:space="preserve">Git Bash (Shell)</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminalOrShell.pwsh" xml:space="preserve">PowerShell (Shell)</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminalOrShell.gnome" xml:space="preserve">Gnome</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminalOrShell.konsole" xml:space="preserve">Konsole</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminalOrShell.osascript" xml:space="preserve">AppleScript</x:String>
+  <x:String x:Key="Text.Preference.General.DefaultTerminalOrShell.xfce4" xml:space="preserve">xfce4</x:String>
   <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">启动时检测软件更新</x:String>
   <x:String x:Key="Text.Preference.General.Locale" xml:space="preserve">显示语言</x:String>
   <x:String x:Key="Text.Preference.General.MaxHistoryCommits" xml:space="preserve">最大历史提交数</x:String>

src/ViewModels/Preference.cs

@@ -115,6 +115,19 @@ namespace SourceGit.ViewModels
             }
         }
 
+        public string DefaultTerminal
+        {
+            get => Models.AvatarManager.SelectedServer;
+            set
+            {
+                if (Models.AvatarManager.SelectedServer != value)
+                {
+                    Models.AvatarManager.SelectedServer = value;
+                    OnPropertyChanged(nameof(DefaultTerminal));
+                }
+            }
+        }
+
         public int MaxHistoryCommits
         {
             get => _maxHistoryCommits;

src/Views/Preference.axaml

@@ -20,6 +20,12 @@
         ExtendClientAreaToDecorationsHint="True"
         ExtendClientAreaChromeHints="NoChrome"
         SystemDecorations="{OnPlatform Full, Linux=None}">
+  
+  <Window.Resources>
+    <v:TerminalOrShellNameToBitmapConverter x:Key="TerminalOrShellNameToBitmapConverter" />
+    <v:TerminalOrShellNameToLocalizedNameConverter x:Key="TerminalOrShellNameToLocalizedNameConverter" />
+  </Window.Resources>
+  
   <Grid RowDefinitions="Auto,Auto" Margin="{OnPlatform 0, Linux=6}">
     <!-- Custom window shadow for Linux -->
     <Border Grid.Row="0" Grid.RowSpan="2"
@@ -67,7 +73,7 @@
           <TabItem.Header>
             <TextBlock Classes="tab_header" Text="{DynamicResource Text.Preference.General}"/>
           </TabItem.Header>
-          <Grid Margin="8" RowDefinitions="32,32,32,32,32,32" ColumnDefinitions="Auto,*">
+          <Grid Margin="8" RowDefinitions="32,32,32,32,32,32,32" ColumnDefinitions="Auto,*">
             <TextBlock Grid.Row="0" Grid.Column="0"
                        Text="{DynamicResource Text.Preference.General.Locale}"
                        HorizontalAlignment="Right"
@@ -96,10 +102,29 @@
             </ComboBox>
             
             <TextBlock Grid.Row="2" Grid.Column="0"
+                       Text="{DynamicResource Text.Preference.General.DefaultTerminal}"
+                       HorizontalAlignment="Right"
+                       Margin="0,0,16,0"/>
+            <ComboBox Grid.Row="2" Grid.Column="1"
+                      MinHeight="28"
+                      Padding="8,0"
+                      HorizontalAlignment="Stretch"
+                      SelectedItem="{Binding DefaultTerminal, Mode=TwoWay}">
+              <ComboBox.ItemTemplate>
+                <DataTemplate DataType="x:String">
+                  <StackPanel Orientation="Horizontal">
+                    <Image Width="16" Height="16" Source="{Binding Converter={StaticResource TerminalOrShellNameToBitmapConverter}}" />
+                    <TextBlock Text="{Binding Converter={StaticResource TerminalOrShellNameToLocalizedNameConverter}}" />
+                  </StackPanel>
+                </DataTemplate>
+              </ComboBox.ItemTemplate>
+            </ComboBox>
+
+            <TextBlock Grid.Row="3" Grid.Column="0"
                        Text="{DynamicResource Text.Preference.General.MaxHistoryCommits}"
                        HorizontalAlignment="Right"
                        Margin="0,0,16,0"/>
-            <Grid Grid.Row="2" Grid.Column="1" ColumnDefinitions="*,64">
+            <Grid Grid.Row="3" Grid.Column="1" ColumnDefinitions="*,64">
               <Slider Grid.Column="0"
                       Minimum="20000" Maximum="100000"
                       TickPlacement="BottomRight" TickFrequency="5000"
@@ -123,16 +148,16 @@
                          Text="{Binding MaxHistoryCommits}"/>
             </Grid>
 
-            <CheckBox Grid.Row="3" Grid.Column="1"
+            <CheckBox Grid.Row="4" Grid.Column="1"
                       Content="{DynamicResource Text.Preference.General.RestoreTabs}"
                       IsChecked="{Binding RestoreTabs, Mode=TwoWay}"/>
 
-            <CheckBox Grid.Row="4" Grid.Column="1"
+            <CheckBox Grid.Row="5" Grid.Column="1"
                       Height="32"
                       Content="{DynamicResource Text.Preference.General.UseFixedTabWidth}"
                       IsChecked="{Binding Source={x:Static vm:Preference.Instance}, Path=UseFixedTabWidth, Mode=TwoWay}"/>
 
-            <CheckBox Grid.Row="5" Grid.Column="1"
+            <CheckBox Grid.Row="6" Grid.Column="1"
                       Height="32"
                       Content="{DynamicResource Text.Preference.General.Check4UpdatesOnStartup}"
                       IsChecked="{Binding Source={x:Static vm:Preference.Instance}, Path=Check4UpdatesOnStartup, Mode=TwoWay}"/>

src/Views/Preference.axaml.cs

@@ -6,9 +6,12 @@ using System.Threading.Tasks;
 
 using Avalonia.Collections;
 using Avalonia.Controls;
+using Avalonia.Data.Converters;
 using Avalonia.Input;
 using Avalonia.Interactivity;
 using Avalonia.Media;
+using Avalonia.Media.Imaging;
+using Avalonia.Platform;
 using Avalonia.Platform.Storage;
 using Avalonia.Threading;
 
@@ -242,4 +245,42 @@ namespace SourceGit.Views
             }
         }
     }
+    
+    public sealed class TerminalOrShellNameToBitmapConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is string terminalName && !string.IsNullOrWhiteSpace(terminalName))
+            {
+                var icon = AssetLoader.Open(new Uri($"avares://SourceGit/Resources/ExternalTerminalIcons/{terminalName}.png", UriKind.RelativeOrAbsolute));
+                return  new Bitmap(icon);
+            }
+
+            return null;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotSupportedException();
+        }
+    }
+    
+    public sealed class TerminalOrShellNameToLocalizedNameConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is string terminalName && !string.IsNullOrWhiteSpace(terminalName))
+            {
+                var name = App.Text($"Text.Preference.General.DefaultTerminalOrShell.{terminalName}");
+                return name;
+            }
+
+            return null;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotSupportedException();
+        }
+    }
 }