Add search engine url setting

src/Markdowser/Models/Settings.cs

@@ -11,6 +11,8 @@ public class Settings
 
     public bool DarkMode { get; set; }
 
+    public string SearchEngineUrl { get; set; } = "https://duckduckgo.com/html/?kd=-1&k1=-1&q={0}";
+
     public string? HomeUrl { get; set; }
 
     public static void SaveSettings()

src/Markdowser/ViewModels/MainWindowViewModel.cs

@@ -220,7 +220,14 @@ public partial class MainWindowViewModel : ViewModelBase
             else
             {
                 // Search with duckduckgo
-                Url = $"https://duckduckgo.com/html/?kd=-1&k1=-1&q={Uri.EscapeDataString(Url)}";
+                try
+                {
+                    Url = string.Format(Settings.Current.SearchEngineUrl, Uri.EscapeDataString(Url));
+                }
+                catch (FormatException ex)
+                {
+                    WindowNotificationManager.Show(new Notification("Invalid Search Engine URL", $"{ex.Message}", NotificationType.Error));
+                }
             }
         }
 

src/Markdowser/ViewModels/SettingsViewModel.cs

@@ -10,6 +10,12 @@ public class SettingsViewModel : ViewModelBase
         set => Settings.Current.HomeUrl = value;
     }
 
+    public string SearchEngineUrl
+    {
+        get => Settings.Current.SearchEngineUrl;
+        set => Settings.Current.SearchEngineUrl = value;
+    }
+
     public bool DarkMode
     {
         get => Settings.Current.DarkMode;

src/Markdowser/Views/MainWindow.axaml

@@ -87,7 +87,7 @@
                 <Button Grid.Column="3" i:Attached.Icon="fa-solid fa-house" Command="{StaticResource HomeCommand}" />
 
                 <Grid Grid.Column="4">
-                    <TextBox IsVisible="{Binding !IsBusy}" Watermark="Search DuckDuckGo or type a URL" Text="{Binding Url}" BorderThickness="0">
+                    <TextBox IsVisible="{Binding !IsBusy}" Watermark="Search or type a URL" Text="{Binding Url}" BorderThickness="0">
                         <TextBox.KeyBindings>
                             <KeyBinding Gesture="Enter" Command="{Binding Browse}" />
                         </TextBox.KeyBindings>

src/Markdowser/Views/SettingsView.axaml

@@ -23,6 +23,9 @@
         <TextBlock Text="Dark Mode" />
         <ToggleSwitch IsChecked="{Binding DarkMode}" Command="{StaticResource ChangeThemeCommand}" />
 
+        <TextBlock Text="Search Engine URL" />
+        <TextBox Text="{Binding SearchEngineUrl}" Watermark="URL with {0} as encoded search query" />
+
         <TextBlock Text="Home URL" />
         <TextBox Text="{Binding HomeUrl}" Watermark="URL, or leave empty to use default" />
     </StackPanel>