feat: Add recursive search for XLS files in subfolders

SharePointFunctions.ps1

@@ -248,21 +248,14 @@ function List-XlsFiles {
                 throw "Folder not found: $($_.Exception.Message)"
             }
             $items = Get-MgDriveItemChild -DriveId $drive.Id -DriveItemId $folderItem.id
+            
+            # Call the recursive function to process files and subfolders
+            $fileList = Get-XlsFilesRecursive -DriveId $drive.Id -DriveItemId $folderItem.id
         } else {
             $script:txtStatus.Text += "Searching in root folder`n"
-            $items = Get-MgDriveItemChild -DriveId $drive.Id -DriveItemId $root.Id
-        }
             
-        foreach ($item in $items) {
+            # Call the recursive function to process files and subfolders
-            $script:txtStatus.Text += "Checking file: $($item.Name)`n"
+            $fileList = Get-XlsFilesRecursive -DriveId $drive.Id -DriveItemId $root.Id
-            if ($item.Name -like "*.xls" -and $item.Name -notlike "*.xlsx") {
-                $fileList += [PSCustomObject]@{
-                    OriginalPath = $item.WebUrl
-                    OriginalFileName = $item.Name
-                    TempPath = "$($script:txtTempLib.Text)/$($item.Name)"
-                }
-                $script:txtStatus.Text += "Found XLS file: $($item.Name)`n"
-            }
         }
 
         if ($fileList.Count -gt 0) {
@@ -277,3 +270,37 @@ function List-XlsFiles {
         $script:txtStatus.Text += "Error listing files: $($_.Exception.Message)`n"
     }
 }
+
+# Recursive function to get XLS files from a folder and its subfolders
+function Get-XlsFilesRecursive {
+    param (
+        [string]$DriveId,
+        [string]$DriveItemId
+    )
+    
+    $allFiles = @()
+    
+    # Get items in the current folder
+    $items = Get-MgDriveItemChild -DriveId $DriveId -DriveItemId $DriveItemId
+    
+    foreach ($item in $items) {
+        $script:txtStatus.Text += "Checking item: $($item.Name)`n"
+        
+        # If it's a folder, recurse into it
+        if ($item.Folder) {
+            $script:txtStatus.Text += "Found folder: $($item.Name), recursing...`n"
+            $allFiles += Get-XlsFilesRecursive -DriveId $DriveId -DriveItemId $item.Id
+        }
+        # If it's an Excel file, add it to the list
+        elseif ($item.Name -like "*.xls" -or $item.Name -like "*.xlsx" -or $item.Name -like "*.xlsm") {
+            $script:txtStatus.Text += "Found XLS file: $($item.Name)`n"
+            $allFiles += [PSCustomObject]@{
+                OriginalPath = $item.WebUrl
+                OriginalFileName = $item.Name
+                TempPath = "$($script:txtTempLib.Text)/$($item.Name)"
+            }
+        }
+    }
+    
+    return $allFiles
+}