Add logging

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

@@ -30,12 +30,14 @@
     <!--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

@@ -1,5 +1,6 @@
 using Markdowser.Utilities;
 
+using System;
 using System.IO;
 using System.Reflection;
 using System.Text.Json;
@@ -32,7 +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/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;
@@ -56,11 +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/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;
 

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;
@@ -220,7 +219,7 @@ 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;
         }
@@ -257,7 +256,7 @@ public partial class MainWindowViewModel : ViewModelBase
 
         _ = Task.Run(async () =>
         {
-            Debug.WriteLine("Fetching URL...");
+            Logger.LogInfo($"Fetching URL: {Url}");
 
             try
             {
@@ -288,6 +287,8 @@ public partial class MainWindowViewModel : ViewModelBase
                 Content = await contentProcessorManager.ProcessContent(httpResponseMessage, new Progress<ProcessingProgress>(p => Progress = p.Percentage));
 
                 Dispatcher.UIThread.Post(() => CurrentTab.Header = Content.Title);
+
+                Logger.LogInfo($"Fetched URL: {Url}");
             }
             catch (HttpRequestException e)
             {
@@ -307,6 +308,8 @@ public partial class MainWindowViewModel : ViewModelBase
                 _ = errorMessage.AppendLine($"Failed to fetch URL: {e.Message}");
 
                 Content = new MarkdownContentViewModel("Error", errorMessage.ToString());
+
+                Logger.LogError(e.Message);
             }
             catch (Exception e)
             {
@@ -317,6 +320,8 @@ 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/ViewModelBase.cs

@@ -2,7 +2,10 @@
 using Avalonia.Controls.Notifications;
 using Avalonia.Platform;
 
+using CuteUtils.Logging;
+
 using Markdowser.Models;
+using Markdowser.Utilities;
 
 using ReactiveUI;
 
@@ -19,6 +22,8 @@ public class ViewModelBase : ReactiveObject
 
     public WindowNotificationManager WindowNotificationManager => windowNotificationManager!;
 
+    public Logger Logger => GlobalState.Logger;
+
     protected internal void InitializeWindowNotificationManager(Window window)
     {
         TopLevel? topLevel = TopLevel.GetTopLevel(window);