Merge branch 'develop' into feature/cache

src/Markdowser/App.axaml.cs

@@ -3,10 +3,15 @@ using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Markup.Xaml;
 using Avalonia.Styling;
 
+using CuteUtils.Logging;
+
 using Markdowser.Models;
+using Markdowser.Utilities;
 using Markdowser.ViewModels;
 using Markdowser.Views;
 
+using System.IO;
+
 namespace Markdowser;
 
 public partial class App : Application
@@ -18,6 +23,11 @@ public partial class App : Application
 
     public override void OnFrameworkInitializationCompleted()
     {
+        if (!Directory.Exists(Configuration.ApplicationDataPath))
+        {
+            _ = Directory.CreateDirectory(Configuration.ApplicationDataPath);
+        }
+
         if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
         {
             desktop.MainWindow = new MainWindow
@@ -25,12 +35,23 @@ public partial class App : Application
                 DataContext = new MainWindowViewModel(),
             };
 
+            // Clear log files
+            GlobalState.Logger.ClearLogFile(LogSeverity.Debug);
+            GlobalState.Logger.ClearLogFile(LogSeverity.Info);
+            GlobalState.Logger.ClearLogFile(LogSeverity.Warn);
+            GlobalState.Logger.ClearLogFile(LogSeverity.Error);
+            GlobalState.Logger.ClearLogFile(LogSeverity.Fatal);
+
             desktop.MainWindow.Closing += (sender, e) =>
             {
+                GlobalState.Logger.LogInfo("Saving settings...");
                 Settings.SaveSettings();
+                GlobalState.Logger.LogInfo("Settings saved.");
             };
         }
 
+        GlobalState.Logger.LogInfo("Application started.");
+
         base.OnFrameworkInitializationCompleted();
 
         if (Current is not null)

src/Markdowser/Commands/HyperlinkCommand.cs

@@ -1,7 +1,6 @@
 using Markdowser.Utilities;
 
 using System;
-using System.Diagnostics;
 using System.Windows.Input;
 
 namespace Markdowser.Commands;
@@ -23,7 +22,7 @@ public class HyperlinkCommand : ICommand
     {
         if (parameter is string url)
         {
-            Debug.WriteLine($"Hyperlink clicked: {url}");
+            GlobalState.Logger.LogDebug($"Hyperlink clicked: {url}");
 
             if (Uri.IsWellFormedUriString(url, UriKind.Absolute))
             {
@@ -35,7 +34,7 @@ public class HyperlinkCommand : ICommand
             }
             else
             {
-                Debug.WriteLine($"Invalid URL: {url}");
+                GlobalState.Logger.LogDebug($"Invalid URL: {url}");
             }
         }
     }

src/Markdowser/Markdowser.csproj

@@ -7,6 +7,7 @@
     <ApplicationManifest>app.manifest</ApplicationManifest>
     <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
     <Version>0.1.0.0</Version>
+    <IncludeSourceRevisionInInformationalVersion>false</IncludeSourceRevisionInInformationalVersion>
   </PropertyGroup>
 
   <ItemGroup>
@@ -30,12 +31,14 @@
     <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
     <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.10" />
     <PackageReference Include="Avalonia.ReactiveUI" Version="11.0.10" />
+    <PackageReference Include="CuteUtils" Version="1.0.0" />
     <PackageReference Include="Markdown.Avalonia" Version="11.0.2" />
     <PackageReference Include="Projektanker.Icons.Avalonia" Version="9.1.2" />
     <PackageReference Include="Projektanker.Icons.Avalonia.FontAwesome" Version="9.1.2" />
     <PackageReference Include="Projektanker.Icons.Avalonia.MaterialDesign" Version="9.1.2" />
     <PackageReference Include="ReverseMarkdown" Version="4.3.0" />
     <PackageReference Include="Semi.Avalonia" Version="11.0.7.1" />
+    <PackageReference Include="Syroot.Windows.IO.KnownFolders" Version="1.3.0" />
   </ItemGroup>
 
   <ItemGroup>

src/Markdowser/Models/Settings.cs

@@ -1,6 +1,8 @@
 using Markdowser.Utilities;
 
+using System;
 using System.IO;
+using System.Reflection;
 using System.Text.Json;
 
 namespace Markdowser.Models;
@@ -15,6 +17,8 @@ public class Settings
 
     public string? HomeUrl { get; set; }
 
+    public string UserAgent { get; set; } = $"{Assembly.GetExecutingAssembly().GetName().Name}/{Assembly.GetExecutingAssembly().GetName().Version?.ToString()}";
+
     public static void SaveSettings()
     {
         if (!Directory.Exists(Configuration.ApplicationDataPath))
@@ -29,7 +33,15 @@ public class Settings
     {
         if (File.Exists(Configuration.SettingsFilePath))
         {
-            return JsonSerializer.Deserialize<Settings>(File.ReadAllText(Configuration.SettingsFilePath)) ?? new Settings();
+            try
+            {
+                return JsonSerializer.Deserialize<Settings>(File.ReadAllText(Configuration.SettingsFilePath)) ?? new Settings();
+            }
+            catch (Exception ex)
+            {
+                GlobalState.Logger.LogWarn(ex.Message);
+                return new Settings();
+            }
         }
         else
         {

src/Markdowser/Processing/IContentProcessor.cs

@@ -9,6 +9,10 @@ namespace Markdowser.Processing;
 
 internal interface IContentProcessor
 {
+    string Name { get; }
+
+    string Description { get; }
+
     bool CanProcess(HttpContentHeaders httpContentHeaders);
 
     Task<ContentViewModelBase> Process(HttpResponseMessage httpResponseMessage, IProgress<ProcessingProgress> progress);

src/Markdowser/Processing/Processors/CommonImageProcessor.cs

@@ -7,8 +7,13 @@ using System.Net.Http.Headers;
 using System.Threading.Tasks;
 
 namespace Markdowser.Processing.Processors;
+
 internal class CommonImageProcessor : IContentProcessor
 {
+    public string Name => "Common Image Processor";
+
+    public string Description => "Processes common image types (e.g. PNG, JPEG, GIF)";
+
     public bool CanProcess(HttpContentHeaders httpContentHeaders)
     {
         if (httpContentHeaders.ContentType?.MediaType == "image/svg+xml")
@@ -23,4 +28,4 @@ internal class CommonImageProcessor : IContentProcessor
     {
         return new CommonImageContentViewModel(httpResponseMessage.RequestMessage?.RequestUri?.Host?.ToString() ?? "Image", await httpResponseMessage.Content.ReadAsStreamAsync());
     }
-}
+}

src/Markdowser/Processing/Processors/HtmlProcessor.cs

@@ -1,10 +1,10 @@
 using HtmlAgilityPack;
 
+using Markdowser.Utilities;
 using Markdowser.ViewModels;
 using Markdowser.ViewModels.Content;
 
 using System;
-using System.Diagnostics;
 using System.IO;
 using System.Linq;
 using System.Net.Http;
@@ -19,6 +19,10 @@ internal partial class HtmlProcessor : IContentProcessor
 {
     private readonly ReverseMarkdown.Converter markdownConverter = new();
 
+    public string Name => "HTML Processor";
+
+    public string Description => "Processes HTML content";
+
     public HtmlProcessor()
     {
         markdownConverter.Config.UnknownTags = ReverseMarkdown.Config.UnknownTagsOption.Bypass;
@@ -52,11 +56,11 @@ internal partial class HtmlProcessor : IContentProcessor
         htmlDoc.LoadHtml(html.ToString());
         string title = htmlDoc.DocumentNode.SelectSingleNode("html/head/title")?.InnerText?.Trim() ?? httpResponseMessage.RequestMessage?.RequestUri?.ToString() ?? "Untitled";
 
-        Debug.WriteLine("Converting HTML to markdown...");
+        GlobalState.Logger.LogDebug("Converting HTML to markdown...");
 
         string markdown = markdownConverter.Convert(html.ToString());
 
-        Debug.WriteLine("Processing markdown...");
+        GlobalState.Logger.LogDebug("Processing markdown...");
 
         int currentLine = 0;
 

src/Markdowser/Program.cs

@@ -1,11 +1,17 @@
 using Avalonia;
 using Avalonia.ReactiveUI;
 
+using Markdowser.Utilities;
+
 using Projektanker.Icons.Avalonia;
 using Projektanker.Icons.Avalonia.FontAwesome;
 using Projektanker.Icons.Avalonia.MaterialDesign;
 
+using ReactiveUI;
+
 using System;
+using System.Reactive;
+using System.Threading.Tasks;
 
 namespace Markdowser;
 
@@ -17,8 +23,30 @@ internal static class Program
     [STAThread]
     public static void Main(string[] args)
     {
-        _ = BuildAvaloniaApp()
-        .StartWithClassicDesktopLifetime(args);
+        AppDomain.CurrentDomain.UnhandledException += (sender, e) =>
+        {
+            GlobalState.Logger.LogFatal(e.ExceptionObject.ToString() ?? "Unknown error.");
+        };
+
+        TaskScheduler.UnobservedTaskException += (sender, e) =>
+        {
+            GlobalState.Logger.LogFatal(e.Exception.ToString());
+        };
+
+        RxApp.DefaultExceptionHandler = Observer.Create<Exception>(ex =>
+        {
+            GlobalState.Logger.LogFatal(ex.ToString());
+        });
+
+        try
+        {
+            _ = BuildAvaloniaApp()
+                .StartWithClassicDesktopLifetime(args);
+        }
+        catch (Exception ex)
+        {
+            GlobalState.Logger.LogFatal(ex.ToString());
+        }
     }
 
     // Avalonia configuration, don't remove; also used by visual designer.

src/Markdowser/Utilities/Configuration.cs

@@ -1,12 +1,39 @@
-using System;
+using Syroot.Windows.IO;
+
+using System;
 using System.IO;
+using System.Runtime.InteropServices;
 
 namespace Markdowser.Utilities;
 
 internal static class Configuration
 {
-    public static string DownloadPath => Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
-    public static string ApplicationDataPath => Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), nameof(Markdowser));
+    public static string DownloadPath
+    {
+        get
+        {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                return KnownFolders.Downloads.Path;
+            }
+
+            return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "Downloads");
+        }
+    }
+
+    public static string ApplicationDataPath
+    {
+        get
+        {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "StoneRed", nameof(Markdowser));
+            }
+
+            return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "StoneRed", nameof(Markdowser));
+        }
+    }
 
     public static string SettingsFilePath => Path.Combine(ApplicationDataPath, "settings.json");
+    public static string LogFilePath => Path.Combine(ApplicationDataPath, $"{nameof(Markdowser)}.log");
 }

src/Markdowser/Utilities/GlobalState.cs

@@ -1,5 +1,7 @@
 using Avalonia.Controls;
 
+using CuteUtils.Logging;
+
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
@@ -16,6 +18,42 @@ internal static class GlobalState
 
     private static string url = string.Empty;
 
+    public static Logger Logger { get; } = new()
+    {
+        Config = new()
+        {
+            DebugConfig = new()
+            {
+                LogTarget = LogTarget.DebugConsole
+            },
+            InfoConfig = new()
+            {
+                LogTarget = LogTarget.DebugConsole | LogTarget.File,
+                FilePath = Configuration.LogFilePath
+            },
+            WarnConfig = new()
+            {
+                LogTarget = LogTarget.DebugConsole | LogTarget.File,
+                FilePath = Configuration.LogFilePath
+            },
+            ErrorConfig = new()
+            {
+                LogTarget = LogTarget.DebugConsole | LogTarget.File,
+                FilePath = Configuration.LogFilePath
+            },
+            FatalConfig = new()
+            {
+                LogTarget = LogTarget.DebugConsole | LogTarget.File,
+                FilePath = Configuration.LogFilePath
+            },
+            FormatConfig = new()
+            {
+                DebugConsoleFormat = new LogFormatBuilder().DateTime().Text(" ").LogSeverity(padding: -6).FilePath().Text(":").MemberName().Text(":").LineNumber().Text(Environment.NewLine).Message(),
+                FileFormat = new LogFormatBuilder().DateTime().Text(" ").LogSeverity(padding: -6).FilePath().Text(":").MemberName().Text(":").LineNumber().Text(Environment.NewLine).Message(),
+            }
+        }
+    };
+
     public static Stack<string> BackHistory { get; } = new();
 
     public static Stack<string> ForwardHistory { get; } = new();

src/Markdowser/Utilities/HttpPathResolver.cs

@@ -10,7 +10,6 @@ using Markdowser.Models;
 
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.IO;
 using System.Net.Http;
 using System.Threading.Tasks;
@@ -40,7 +39,7 @@ public class HttpPathResolver : IPathResolver
             relativeOrAbsolutePath = new Uri(new Uri(GlobalState.Url), relativeOrAbsolutePath).ToString();
         }
 
-        Debug.WriteLine($"Resolving image: {relativeOrAbsolutePath}");
+        GlobalState.Logger.LogDebug($"Resolving image: {relativeOrAbsolutePath}");
 
         HttpResponseMessage httpResponseMessage;
 
@@ -80,5 +79,7 @@ public class HttpPathResolver : IPathResolver
         {
             Dispatcher.UIThread.Post(() => vm.WindowNotificationManager.Show(new Notification("Error", message, NotificationType.Error)));
         }
+
+        GlobalState.Logger.LogError(message);
     }
 }

src/Markdowser/ViewModels/ContentViewModelBase.cs

@@ -1,6 +1,12 @@
-namespace Markdowser.ViewModels;
+using CuteUtils.Logging;
+
+using Markdowser.Utilities;
+
+namespace Markdowser.ViewModels;
 
 public abstract class ContentViewModelBase(string title)
 {
     public string Title { get; } = title;
+
+    public Logger Logger { get; } = GlobalState.Logger;
 }

src/Markdowser/ViewModels/MainWindowViewModel.cs

@@ -12,7 +12,6 @@ using ReactiveUI;
 
 using System;
 using System.Collections.ObjectModel;
-using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Net.Http;
 using System.Reflection;
@@ -48,7 +47,7 @@ public partial class MainWindowViewModel : ViewModelBase
 
             _ = this.RaiseAndSetIfChanged(ref currentTab!, value);
 
-            Url = currentTab?.Tag?.ToString() ?? string.Empty;
+            Url = value?.Tag?.ToString() ?? string.Empty;
 
             FetchUrl(true);
         }
@@ -134,18 +133,32 @@ public partial class MainWindowViewModel : ViewModelBase
 
     public ICommand CloseTab => ReactiveCommand.Create(() =>
     {
+        if (IsBusy)
+        {
+            WindowNotificationManager.Show(new Notification("Busy", "The browser is currently busy.", NotificationType.Warning));
+            return;
+        }
+
         if (Tabs.Count > 1)
         {
             int currentIndex = Tabs.IndexOf(CurrentTab);
-            _ = Tabs.Remove(CurrentTab);
 
             CurrentTab = currentIndex > 0 ? Tabs[currentIndex - 1] : Tabs[0];
+
+            Tabs.RemoveAt(currentIndex);
+
             this.RaisePropertyChanged(nameof(CloseTabEnabled));
         }
     });
 
     public ICommand NewTab => ReactiveCommand.Create(() =>
     {
+        if (IsBusy)
+        {
+            WindowNotificationManager.Show(new Notification("Busy", "The browser is currently busy.", NotificationType.Warning));
+            return;
+        }
+
         TabItem tab = new() { Header = "New Tab", Name = Guid.NewGuid().ToString() };
         Tabs.Add(tab);
         CurrentTab = tab;
@@ -163,7 +176,6 @@ public partial class MainWindowViewModel : ViewModelBase
 
     public MainWindowViewModel()
     {
-        httpClient.DefaultRequestHeaders.UserAgent.ParseAdd($"{nameof(Markdowser)}/{Assembly.GetExecutingAssembly().GetName().Version?.ToString()}");
         httpClient.Timeout = TimeSpan.FromSeconds(10);
 
         content = DefaultContent;
@@ -209,7 +221,7 @@ public partial class MainWindowViewModel : ViewModelBase
         if (string.IsNullOrWhiteSpace(Url))
         {
             Content = DefaultContent;
-            Debug.WriteLine("URL is empty.");
+            Logger.LogDebug("URL is empty.");
             CurrentTab.Header = "New Tab";
             return;
         }
@@ -234,12 +246,19 @@ public partial class MainWindowViewModel : ViewModelBase
             }
         }
 
+        httpClient.DefaultRequestHeaders.UserAgent.Clear();
+        if (!httpClient.DefaultRequestHeaders.UserAgent.TryParseAdd(Settings.Current.UserAgent))
+        {
+            WindowNotificationManager.Show(new Notification("Invalid User Agent", "Failed to set user agent.", NotificationType.Error));
+            return;
+        }
+
         IsBusy = true;
         Progress = 0;
 
         _ = Task.Run(async () =>
         {
-            Debug.WriteLine("Fetching URL...");
+            Logger.LogInfo($"Fetching URL: {Url}");
 
             try
             {
@@ -279,6 +298,8 @@ public partial class MainWindowViewModel : ViewModelBase
                 }
 
                 Dispatcher.UIThread.Post(() => CurrentTab.Header = Content.Title);
+
+                Logger.LogInfo($"Fetched URL: {Url}");
             }
             catch (HttpRequestException e)
             {
@@ -298,6 +319,8 @@ public partial class MainWindowViewModel : ViewModelBase
                 _ = errorMessage.AppendLine($"Failed to fetch URL: {e.Message}");
 
                 Content = new MarkdownContentViewModel("Error", errorMessage.ToString());
+
+                Logger.LogError(e.Message);
             }
             catch (Exception e)
             {
@@ -308,6 +331,8 @@ public partial class MainWindowViewModel : ViewModelBase
 
                 Content = new MarkdownContentViewModel("Error", errorMessage.ToString());
                 Dispatcher.UIThread.Post(() => CurrentTab.Header = $"Error: {e.GetType().Name}");
+
+                Logger.LogError(e.Message);
             }
             finally
             {

src/Markdowser/ViewModels/SettingsViewModel.cs

@@ -16,6 +16,12 @@ public class SettingsViewModel : ViewModelBase
         set => Settings.Current.SearchEngineUrl = value;
     }
 
+    public string UserAgent
+    {
+        get => Settings.Current.UserAgent;
+        set => Settings.Current.UserAgent = value;
+    }
+
     public bool DarkMode
     {
         get => Settings.Current.DarkMode;

src/Markdowser/ViewModels/ViewModelBase.cs

@@ -2,10 +2,14 @@
 using Avalonia.Controls.Notifications;
 using Avalonia.Platform;
 
+using CuteUtils.Logging;
+
 using Markdowser.Models;
+using Markdowser.Utilities;
 
 using ReactiveUI;
 
+using System.Diagnostics;
 using System.Reflection;
 
 namespace Markdowser.ViewModels;
@@ -13,12 +17,30 @@ namespace Markdowser.ViewModels;
 public class ViewModelBase : ReactiveObject
 {
     private WindowNotificationManager? windowNotificationManager;
-    public string Title => $"{nameof(Markdowser)} - {Assembly.GetExecutingAssembly().GetName().Version?.ToString()}";
+
+    public string Title
+    {
+        get
+        {
+            string title = nameof(Markdowser);
+            Assembly assembly = Assembly.GetExecutingAssembly();
+            FileVersionInfo fileVersionInfo = FileVersionInfo.GetVersionInfo(assembly.Location);
+            string? version = fileVersionInfo.ProductVersion;
+
+#if DEBUG
+            return $"{title} - Dev {version}";
+#else
+            return $"{title} - {version}";
+#endif
+        }
+    }
 
     public WindowIcon Icon => Settings.Current.DarkMode ? new WindowIcon(AssetLoader.Open(new("avares://Markdowser/Assets/Markdowser-Dark-Transparent.ico"))) : new WindowIcon(AssetLoader.Open(new("avares://Markdowser/Assets/Markdowser-Light-Transparent.ico")));
 
     public WindowNotificationManager WindowNotificationManager => windowNotificationManager!;
 
+    public Logger Logger => GlobalState.Logger;
+
     protected internal void InitializeWindowNotificationManager(Window window)
     {
         TopLevel? topLevel = TopLevel.GetTopLevel(window);

src/Markdowser/Views/Content/MarkdownContentView.axaml

@@ -26,7 +26,7 @@
     </UserControl.Resources>
 
     <Grid>
-        <md:MarkdownScrollViewer Margin="10 0 10 10" Markdown="{Binding Markdown}">
+        <md:MarkdownScrollViewer Margin="10 0 10 0" Markdown="{Binding Markdown}">
             <md:MarkdownScrollViewer.Styles>
                 <Style Selector="ctxt|CTextBlock">
                     <Setter Property="Foreground" Value="{DynamicResource SemiColorText0}" />

src/Markdowser/Views/MainWindow.axaml

@@ -45,9 +45,16 @@
 
     <Grid RowDefinitions="Auto, *, Auto">
         <Grid Grid.Row="0" ColumnDefinitions="*, Auto, Auto">
-            <TabControl Grid.Column="0" Theme="{DynamicResource ScrollTabControl}" SelectedItem="{Binding CurrentTab, Mode=TwoWay}" ItemsSource="{Binding Tabs}" />
-            <Button Grid.Column="1" Command="{Binding CloseTab}" IsEnabled="{Binding CloseTabEnabled}" HorizontalAlignment="Right" VerticalAlignment="Top" Height="32" i:Attached.Icon="fa-solid fa-xmark" />
-            <Button Grid.Column="2" Command="{Binding NewTab}" HorizontalAlignment="Right" VerticalAlignment="Top" Height="32" i:Attached.Icon="fa-solid fa-plus" />
+            <TabControl Grid.Column="0" SelectedItem="{Binding CurrentTab, Mode=TwoWay}" ItemsSource="{Binding Tabs}" IsEnabled="{Binding !IsBusy}" />
+            <Button Grid.Column="1" Command="{Binding CloseTab}" HorizontalAlignment="Right" VerticalAlignment="Stretch" i:Attached.Icon="fa-solid fa-xmark">
+                <Button.IsEnabled>
+                    <MultiBinding Converter="{x:Static BoolConverters.And}">
+                        <Binding Path="CloseTabEnabled" />
+                        <Binding Path="!IsBusy" />
+                    </MultiBinding>
+                </Button.IsEnabled>
+            </Button>
+            <Button Grid.Column="2" Command="{Binding NewTab}" HorizontalAlignment="Right" VerticalAlignment="Stretch" i:Attached.Icon="fa-solid fa-plus" IsEnabled="{Binding !IsBusy}" />
         </Grid>
 
         <Grid Grid.Row="1">
@@ -57,7 +64,7 @@
                 <ColumnDefinition Width="*" utils:ColumnDefinition.IsVisible="{Binding ShowSidePanel}" />
             </Grid.ColumnDefinitions>
 
-            <ContentControl IsEnabled="{Binding !IsBusy}" Margin="0 10 0 0" Content="{Binding Content}" />
+            <ContentControl IsEnabled="{Binding !IsBusy}" Content="{Binding Content}" />
 
             <GridSplitter Grid.Column="1" IsVisible="{Binding ShowSidePanel}" Background="{DynamicResource SemiColorTertiary}" ResizeDirection="Columns" />
             <TabControl  Grid.Column="2" IsVisible="{Binding ShowSidePanel}" Margin="10">
@@ -80,11 +87,25 @@
         </Grid>
 
         <Border Grid.Row="2" BorderThickness="0 2 0 0" CornerRadius="0" BorderBrush="{DynamicResource SemiColorTertiary}">
-            <Grid IsEnabled="{Binding !IsBusy}" ColumnDefinitions="Auto, Auto, Auto, Auto, *, Auto">
-                <Button Grid.Column="0" i:Attached.Icon="fa-solid fa-caret-left" IsEnabled="{Binding BackEnabled}" Command="{Binding Back}" />
-                <Button Grid.Column="1" i:Attached.Icon="fa-solid fa-caret-right" IsEnabled="{Binding ForwardEnabled}" Command="{Binding Forward}" />
-                <Button Grid.Column="2" i:Attached.Icon="fa-solid fa-rotate-right" Command="{Binding Reload}" />
-                <Button Grid.Column="3" i:Attached.Icon="fa-solid fa-house" Command="{StaticResource HomeCommand}" />
+            <Grid ColumnDefinitions="Auto, Auto, Auto, Auto, *, Auto">
+                <Button Grid.Column="0" i:Attached.Icon="fa-solid fa-caret-left" Command="{Binding Back}">
+                    <Button.IsEnabled>
+                        <MultiBinding Converter="{x:Static BoolConverters.And}">
+                            <Binding Path="BackEnabled" />
+                            <Binding Path="!IsBusy" />
+                        </MultiBinding>
+                    </Button.IsEnabled>
+                </Button>
+                <Button Grid.Column="1" i:Attached.Icon="fa-solid fa-caret-right" Command="{Binding Forward}">
+                    <Button.IsEnabled>
+                        <MultiBinding Converter="{x:Static BoolConverters.And}">
+                            <Binding Path="ForwardEnabled" />
+                            <Binding Path="!IsBusy" />
+                        </MultiBinding>
+                    </Button.IsEnabled>
+                </Button>
+                <Button Grid.Column="2" i:Attached.Icon="fa-solid fa-rotate-right" Command="{Binding Reload}" IsEnabled="{Binding !IsBusy}" />
+                <Button Grid.Column="3" i:Attached.Icon="fa-solid fa-house" Command="{StaticResource HomeCommand}" IsEnabled="{Binding !IsBusy}" />
 
                 <Grid Grid.Column="4">
                     <TextBox IsVisible="{Binding !IsBusy}" Watermark="Search or type a URL" Text="{Binding Url}" BorderThickness="0">

src/Markdowser/Views/SettingsView.axaml

@@ -28,5 +28,8 @@
 
         <TextBlock Text="Home URL" />
         <TextBox Text="{Binding HomeUrl}" Watermark="URL, or leave empty to use default" />
+
+        <TextBlock Text="User Agent" />
+        <TextBox Text="{Binding UserAgent}" Watermark="User agent string" />
     </StackPanel>
 </UserControl>