Add target validation action

MainWindow.xaml

@@ -69,6 +69,8 @@
                             <MenuItem Header="Reset to Defaults" Click="ResetConfig_Click"/>
                             <MenuItem Header="Reload Config" Click="ReloadConfig_Click"/>
                             <MenuItem Header="Open Config Folder" Click="OpenConfigFolder_Click"/>
+                            <Separator/>
+                            <MenuItem Header="Validate Targets" Click="ValidateTargets_Click"/>
                         </ContextMenu>
                     </Button.ContextMenu>
                 </Button>

MainWindow.xaml.cs

@@ -22,6 +22,7 @@ public partial class MainWindow : Window
     private List<int>? selectedPath;
     private string? loadedAutoIconPath;
     private System.Windows.Point dragStartPoint;
+    private sealed record TargetValidationIssue(string ItemPath, string Problem);
 
     public MainWindow()
     {
@@ -1343,6 +1344,159 @@ public partial class MainWindow : Window
         ConfigService.OpenConfigFolder();
     }
 
+    private void ValidateTargets_Click(object sender, RoutedEventArgs e)
+    {
+        if (controller is null)
+        {
+            return;
+        }
+
+        ApplyConfigFields();
+        List<TargetValidationIssue> issues = [];
+        ValidateTargets(controller.Config.Items, [], issues);
+
+        if (issues.Count == 0)
+        {
+            StatusText.Text = "Validation complete. No broken targets found.";
+            MessageBox.Show("No broken targets found.", "Taskbar Launcher");
+            return;
+        }
+
+        string message = $"Found {issues.Count} possible broken target(s):\n\n" +
+            string.Join("\n", issues.Take(20).Select(issue => $"- {issue.ItemPath}: {issue.Problem}"));
+        if (issues.Count > 20)
+        {
+            message += $"\n\nShowing first 20 of {issues.Count}.";
+        }
+
+        StatusText.Text = $"Validation found {issues.Count} possible broken target(s).";
+        MessageBox.Show(message, "Taskbar Launcher");
+    }
+
+    private static void ValidateTargets(IEnumerable<LauncherItem> items, List<string> parentNames, List<TargetValidationIssue> issues)
+    {
+        foreach (LauncherItem item in items)
+        {
+            List<string> itemPath = [.. parentNames, string.IsNullOrWhiteSpace(item.Title) ? "Untitled" : item.Title];
+            if (!item.IsDisabled && TryGetTargetIssue(item, out string? problem) && problem is not null)
+            {
+                issues.Add(new TargetValidationIssue(string.Join(" > ", itemPath), problem));
+            }
+
+            if (item.Children.Count > 0)
+            {
+                ValidateTargets(item.Children, itemPath, issues);
+            }
+        }
+    }
+
+    private static bool TryGetTargetIssue(LauncherItem item, out string? problem)
+    {
+        problem = null;
+
+        if (item.Type == LauncherItemType.Menu || item.IsDisabled)
+        {
+            return false;
+        }
+
+        if (string.IsNullOrWhiteSpace(item.Target))
+        {
+            problem = "Target is blank.";
+            return true;
+        }
+
+        string target = Environment.ExpandEnvironmentVariables(item.Target.Trim());
+        switch (item.Type)
+        {
+            case LauncherItemType.Folder:
+                if (!Directory.Exists(target))
+                {
+                    problem = "Folder does not exist.";
+                    return true;
+                }
+
+                return false;
+
+            case LauncherItemType.Website:
+                if (!Uri.TryCreate(target, UriKind.Absolute, out Uri? uri) ||
+                    (uri.Scheme != Uri.UriSchemeHttp && uri.Scheme != Uri.UriSchemeHttps))
+                {
+                    problem = "Website target is not a valid http or https URL.";
+                    return true;
+                }
+
+                return false;
+
+            case LauncherItemType.App:
+                if (!File.Exists(target) && !CommandExistsOnPath(target))
+                {
+                    problem = "Application or shortcut was not found.";
+                    return true;
+                }
+
+                return false;
+
+            case LauncherItemType.File:
+                if (!File.Exists(target))
+                {
+                    problem = "File does not exist.";
+                    return true;
+                }
+
+                return false;
+
+            default:
+                problem = "Item type is not recognized.";
+                return true;
+        }
+    }
+
+    private static bool CommandExistsOnPath(string target)
+    {
+        if (target.IndexOfAny([Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar]) >= 0)
+        {
+            return false;
+        }
+
+        string? pathValue = Environment.GetEnvironmentVariable("PATH");
+        if (string.IsNullOrWhiteSpace(pathValue))
+        {
+            return false;
+        }
+
+        string extension = Path.GetExtension(target);
+        IEnumerable<string> candidateNames = string.IsNullOrWhiteSpace(extension)
+            ? GetExecutableCandidateNames(target)
+            : [target];
+
+        foreach (string directory in pathValue.Split(Path.PathSeparator, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries))
+        {
+            foreach (string candidateName in candidateNames)
+            {
+                string candidatePath = Path.Combine(directory, candidateName);
+                if (File.Exists(candidatePath))
+                {
+                    return true;
+                }
+            }
+        }
+
+        return false;
+    }
+
+    private static IEnumerable<string> GetExecutableCandidateNames(string target)
+    {
+        string? pathExtValue = Environment.GetEnvironmentVariable("PATHEXT");
+        string[] extensions = string.IsNullOrWhiteSpace(pathExtValue)
+            ? [".EXE", ".CMD", ".BAT", ".COM"]
+            : pathExtValue.Split(Path.PathSeparator, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+
+        foreach (string extension in extensions)
+        {
+            yield return target + extension;
+        }
+    }
+
     private void About_Click(object sender, RoutedEventArgs e)
     {
         AboutWindow aboutWindow = new()

README.md

@@ -19,6 +19,7 @@ Download the compiled Windows release from:
 - Right-click launcher entries to pin or unpin them from the top
 - Right-click launcher entries or Settings items to temporarily disable them
 - Right-click app/file entries to open their containing folder
+- Validate missing app, file, and folder targets from Settings
 - Right-click item duplication in Settings
 - Right-click items in Settings to pin them to the top of their menu
 - Per-item icon and display mode

TaskbarLauncher.csproj

@@ -12,8 +12,8 @@
     <Authors>Ray Berezowski</Authors>
     <ApplicationIcon>Assets\AppIcon.ico</ApplicationIcon>
     <Version>1.0.1</Version>
-    <AssemblyVersion>1.0.1.9</AssemblyVersion>
+    <AssemblyVersion>1.0.1.10</AssemblyVersion>
-    <FileVersion>1.0.1.9</FileVersion>
+    <FileVersion>1.0.1.10</FileVersion>
     <InformationalVersion>1.0.1</InformationalVersion>
   </PropertyGroup>
 

docs/INSTALL.md

@@ -41,6 +41,7 @@ From Settings you can:
 - Right-click an item and choose **Pin to Top** to show it first in its menu
 - Right-click an item and choose **Disable Item** or **Enable Item** to hide or restore it
 - Right-click an app or file item and choose **Open Containing Folder**
+- Use **Config... > Validate Targets** to check for missing app, file, and folder targets
 - Set per-item icon sizes
 - Back up and restore `config.json`
 - Enable Start with Windows