ClangFormat on Save via a C# Visual Commander extension

gistfile1.txt

using EnvDTE;
using EnvDTE80;

public class E : VisualCommanderExt.IExtension
{
  public void SetSite(EnvDTE80.DTE2 DTE_, Microsoft.VisualStudio.Shell.Package package)
  {
    DTE = DTE_;
    events = DTE.Events;
    documentEvents = events.DocumentEvents;
    documentEvents.DocumentSaved += OnDocumentSaved;  
  }

  public void Close()
  {
    documentEvents.DocumentSaved -= OnDocumentSaved;
  }

  private void OnDocumentSaved(EnvDTE.Document doc)
  {
    if (doc.Language == "C/C++")
    {
	Document current = DTE.ActiveDocument;
	doc.Activate();

	TextSelection selection = doc.Selection as TextSelection;
	int begin = selection.TopPoint.AbsoluteCharOffset;
	int end = selection.BottomPoint.AbsoluteCharOffset;

	selection.SelectAll();
	DTE.ExecuteCommand("Tools.ClangFormatSelection");

	if (!doc.Saved)
	{
	  doc.Save();
	}

	// As the old selection may not be selectable, be cautious.
	try { selection.MoveToAbsoluteOffset(begin, false); } catch {}
	try { selection.MoveToAbsoluteOffset(end, true); } catch {}

	current.Activate();
    }
  }

  private EnvDTE80.DTE2 DTE;
  private EnvDTE.Events events;
  private EnvDTE.DocumentEvents documentEvents;
}