Added file type filtering to file selection dialogs (#442)

app/MindWork AI Studio/Tools/Rust/FileTypeFilter.cs

@@ -0,0 +1,18 @@
+// ReSharper disable NotAccessedPositionalProperty.Global
+namespace AIStudio.Tools.Rust;
+
+/// <summary>
+/// Represents a file type filter for file selection dialogs.
+/// </summary>
+/// <param name="FilterName">The name of the filter.</param>
+/// <param name="FilterExtensions">The file extensions associated with the filter.</param>
+public readonly record struct FileTypeFilter(string FilterName, string[] FilterExtensions)
+{
+    public static FileTypeFilter PDF => new("PDF Files", ["pdf"]);
+    
+    public static FileTypeFilter Text => new("Text Files", ["txt", "md"]);
+    
+    public static FileTypeFilter AllOffice => new("All Office Files", ["docx", "xlsx", "pptx", "doc", "xls", "ppt", "pdf"]);
+    
+    public static FileTypeFilter AllImages => new("All Image Files", ["jpg", "jpeg", "png", "gif", "bmp", "tiff"]);
+}

app/MindWork AI Studio/Tools/Rust/SelectFileOptions.cs

@@ -0,0 +1,10 @@
+namespace AIStudio.Tools.Rust;
+
+public sealed class SelectFileOptions
+{
+    public required string Title { get; init; }
+    
+    public PreviousFile? PreviousFile { get; init; }
+
+    public FileTypeFilter? Filter { get; init; }
+}

app/MindWork AI Studio/Tools/Services/RustService.FileSystem.cs

@@ -17,10 +17,16 @@ public sealed partial class RustService
         return await result.Content.ReadFromJsonAsync<DirectorySelectionResponse>(this.jsonRustSerializerOptions);
     }
     
-    public async Task<FileSelectionResponse> SelectFile(string title, string? initialFile = null)
+    public async Task<FileSelectionResponse> SelectFile(string title, FileTypeFilter? filter = null, string? initialFile = null)
     {
-        PreviousFile? previousFile = initialFile is null ? null : new (initialFile);
-        var result = await this.http.PostAsJsonAsync($"/select/file?title={title}", previousFile, this.jsonRustSerializerOptions);
+        var payload = new SelectFileOptions
+        {
+            Title = title,
+            PreviousFile = initialFile is null ? null : new (initialFile),
+            Filter = filter
+        };
+        
+        var result = await this.http.PostAsJsonAsync("/select/file", payload, this.jsonRustSerializerOptions);
         if (!result.IsSuccessStatusCode)
         {
             this.logger!.LogError($"Failed to select a file: '{result.StatusCode}'");