Enhancement: new builtin shortcuts: active_office_file

Fixes #2936

Add new builtin shortcut `{active_office_file}` to quickly access the active office file.

* Add a new method `GetActiveOfficeFilePath` in `Flow.Launcher.Infrastructure/Helper.cs` to retrieve the active office file path.
* Add a new builtin shortcut `{active_office_file}` in `Flow.Launcher.Infrastructure/UserSettings/Settings.cs` to use the `GetActiveOfficeFilePath` method.
* Update the `BuiltinShortcuts` list in `Flow.Launcher.Infrastructure/UserSettings/Settings.cs` to include the new `{active_office_file}` shortcut.

---

For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/Flow-Launcher/Flow.Launcher/issues/2936?shareId=XXXX-XXXX-XXXX-XXXX).

Flow.Launcher.Infrastructure/Helper.cs

@@ -1,9 +1,14 @@
-#nullable enable
+#nullable enable
 
 using System;
 using System.IO;
 using System.Text.Json;
 using System.Text.Json.Serialization;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using System.Linq;
+using System.Collections.Generic;
+using win32api = Microsoft.Win32;
 
 namespace Flow.Launcher.Infrastructure
 {
@@ -86,5 +91,41 @@ namespace Flow.Launcher.Infrastructure
 
             return formatted;
         }
+
+        public static string GetActiveOfficeFilePath()
+        {
+            var pid = GetActiveWindowProcessId();
+            var handle = win32api.OpenProcess(win32api.PROCESS_QUERY_INFORMATION | win32api.PROCESS_VM_READ, false, pid);
+            var exePath = win32api.GetModuleFileNameEx(handle, 0);
+            if (exePath.ToLower().Contains("winword.exe"))
+            {
+                return Path.GetFullPath(new win32api.Dispatch("Word.Application").ActiveDocument.FullName);
+            }
+            else if (exePath.ToLower().Contains("powerpnt.exe"))
+            {
+                return Path.GetFullPath(new win32api.Dispatch("PowerPoint.Application").ActivePresentation.FullName);
+            }
+            else if (exePath.ToLower().Contains("excel.exe"))
+            {
+                return Path.GetFullPath(new win32api.Dispatch("Excel.Application").ActiveWorkbook.FullName);
+            }
+            else
+            {
+                return null;
+            }
+        }
+
+        private static int GetActiveWindowProcessId()
+        {
+            var window = GetForegroundWindow();
+            var threadProcessId = GetWindowThreadProcessId(window, out var processId);
+            return processId;
+        }
+
+        [DllImport("user32.dll")]
+        private static extern IntPtr GetForegroundWindow();
+
+        [DllImport("user32.dll", SetLastError = true)]
+        private static extern uint GetWindowThreadProcessId(IntPtr hWnd, out int lpdwProcessId);
     }
 }

Flow.Launcher.Infrastructure/UserSettings/Settings.cs

@@ -231,7 +231,8 @@ namespace Flow.Launcher.Infrastructure.UserSettings
         public ObservableCollection<BuiltinShortcutModel> BuiltinShortcuts { get; set; } = new()
         {
             new BuiltinShortcutModel("{clipboard}", "shortcut_clipboard_description", Clipboard.GetText),
-            new BuiltinShortcutModel("{active_explorer_path}", "shortcut_active_explorer_path", FileExplorerHelper.GetActiveExplorerPath)
+            new BuiltinShortcutModel("{active_explorer_path}", "shortcut_active_explorer_path", FileExplorerHelper.GetActiveExplorerPath),
+            new BuiltinShortcutModel("{active_office_file}", "shortcut_active_office_file", Helper.GetActiveOfficeFilePath)
         };
 
         public bool DontPromptUpdateMsg { get; set; }