private string RenderContentForExtension(string path, string content, string extension, DocumentFile document, string documentContent, LayoutFile layout)
{
var data = new CaseInsensitiveExpando();
data["Site"] = this.Site.GetAsDynamic();
data["Document"] = document.GetAsDynamic(documentContent);
data["Layout"] = layout == null ? null : layout.GetAsDynamic();
data["Books"] = this.Site.Books == null ? null : this.Site.Books.Select(b => b.GetAsDynamic(document)).ToList();
var engine = this.Engines[extension];
return(engine.Render(path, content, data));
}