Add Pandoc version and installation support

app/MindWork AI Studio/Pages/About.razor

@@ -19,13 +19,29 @@
                     <MudListItem T="string" Icon="@Icons.Material.Outlined.Memory" Text="@VersionDotnetRuntime"/>
                     <MudListItem T="string" Icon="@Icons.Material.Outlined.Build" Text="@VersionRust"/>
                     <MudListItem T="string" Icon="@Icons.Material.Outlined.DocumentScanner" Text="@VersionPdfium"/>
+                    <MudListItem T="string" Icon="@Icons.Material.Outlined.Article" Text="@this.versionPandoc"/>
                     <MudListItem T="string" Icon="@Icons.Material.Outlined.Widgets" Text="@MudBlazorVersion"/>
                     <MudListItem T="string" Icon="@Icons.Material.Outlined.Memory" Text="@TauriVersion"/>
                     <MudListItem T="string" Icon="@Icons.Material.Outlined.Translate" Text="@this.OSLanguage"/>
                 </MudList>
-                <MudButton Variant="Variant.Filled" Color="Color.Info" StartIcon="@Icons.Material.Filled.Update" OnClick="() => this.CheckForUpdate()">
+                <MudStack Row="true">
-                    @T("Check for updates")
+                    <MudButton Variant="Variant.Filled" Color="Color.Info" StartIcon="@Icons.Material.Filled.Update" OnClick="() => this.CheckForUpdate()">
-                </MudButton>
+                        @T("Check for updates")
+                    </MudButton>
+                    @if (this.pandocInstallation != default && !this.pandocInstallation.IsAvailable)
+                    {
+                        <MudButton Variant="Variant.Filled" Color="Color.Default" StartIcon="@Icons.Material.Filled.Download" OnClick="async () => await this.ShowPandocDialog()">
+                            @if (string.IsNullOrWhiteSpace(this.pandocInstallation.Version))
+                            {
+                                @T("Install Pandoc")
+                            }
+                            else
+                            {
+                                @T("Update Pandoc")
+                            }
+                        </MudButton>
+                    }
+                </MudStack>
             </ExpansionPanel>
 
             <ExpansionPanel HeaderIcon="@Icons.Custom.Brands.GitHub" HeaderText="@T("Community & Code")">

app/MindWork AI Studio/Pages/About.razor.cs

@@ -1,6 +1,7 @@
 using System.Reflection;
 
 using AIStudio.Components;
+using AIStudio.Dialogs;
 using AIStudio.Tools.Metadata;
 using AIStudio.Tools.Rust;
 using AIStudio.Tools.Services;
@@ -9,6 +10,8 @@ using Microsoft.AspNetCore.Components;
 
 using SharedTools;
 
+using DialogOptions = AIStudio.Dialogs.DialogOptions;
+
 namespace AIStudio.Pages;
 
 public partial class About : MSGComponentBase
@@ -16,6 +19,9 @@ public partial class About : MSGComponentBase
     [Inject]
     private RustService RustService { get; init; } = null!;
     
+    [Inject]
+    private IDialogService DialogService { get; init; } = null!;
+    
     [Inject]
     private ISnackbar Snackbar { get; init; } = null!;
     
@@ -24,6 +30,8 @@ public partial class About : MSGComponentBase
     private static readonly MetaDataArchitectureAttribute META_DATA_ARCH = ASSEMBLY.GetCustomAttribute<MetaDataArchitectureAttribute>()!;
     private static readonly MetaDataLibrariesAttribute META_DATA_LIBRARIES = ASSEMBLY.GetCustomAttribute<MetaDataLibrariesAttribute>()!;
     
+    private static string TB(string fallbackEN) => Tools.PluginSystem.I18N.I.T(fallbackEN, typeof(About).Namespace, nameof(About));
+
     private string osLanguage = string.Empty;
     
     private static string VersionApp => $"MindWork AI Studio: v{META_DATA.Version} (commit {META_DATA.AppCommitHash}, build {META_DATA.BuildNum}, {META_DATA_ARCH.Architecture.ToRID().ToUserFriendlyName()})";
@@ -44,6 +52,9 @@ public partial class About : MSGComponentBase
     
     private string VersionPdfium => $"{T("Used PDFium version")}: v{META_DATA_LIBRARIES.PdfiumVersion}";
     
+    private string versionPandoc = TB("Determine Pandoc version, please wait...");
+    private PandocInstallation pandocInstallation;
+
     private GetLogPathsResponse logPaths;
     
     #region Overrides of ComponentBase
@@ -52,11 +63,40 @@ public partial class About : MSGComponentBase
     {
         this.osLanguage = await this.RustService.ReadUserLanguage();
         this.logPaths = await this.RustService.GetLogPaths();
+        
         await base.OnInitializedAsync();
+        await this.DeterminePandocVersion();
     }
 
     #endregion
 
+    private async Task DeterminePandocVersion()
+    {
+        this.pandocInstallation = await Pandoc.CheckAvailabilityAsync(this.RustService, false);
+        var pandocInstallationType = this.pandocInstallation.IsLocalInstallation 
+            ? T("installed by AI Studio")
+            : T("installation provided by the system");
+        
+        switch (this.pandocInstallation)
+        {
+            case { CheckWasSuccessful: true, IsAvailable: true }:
+                this.versionPandoc = $"{this.T("Installed Pandoc version")}: v{this.pandocInstallation.Version} ({pandocInstallationType}) - OK";
+                break;
+            
+            case { CheckWasSuccessful: true, IsAvailable: false }:
+                this.versionPandoc = $"{this.T("Installed Pandoc version")}: v{this.pandocInstallation.Version} ({pandocInstallationType}) - {T("this version does not met the requirements")}";
+                break;
+            
+            default:
+                this.versionPandoc = TB("Installed Pandoc version: Pandoc is not installed or not available.");
+                break;
+        }
+        
+        this.StateHasChanged();
+    }
+    
+    private async Task ShowPandocDialog() => await this.DialogService.ShowAsync<PandocDialog>(T("Pandoc Installation"), DialogOptions.FULLSCREEN);
+    
     private async Task CopyStartupLogPath()
     {
         await this.RustService.CopyText2Clipboard(this.Snackbar, this.logPaths.LogStartupPath);