1  use std::fmt::{self, Display};
 2  
 3  use apibara_core::node::v1alpha2::Cursor;
 4  
 5  /// A newtype to display a cursor that may be `None` as "genesis".
 6  pub struct DisplayCursor<'a>(pub &'a Option<Cursor>);
 7  
 8  impl<'a> Display for DisplayCursor<'a> {
 9      fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
10          match self.0 {
11              Some(cursor) => write!(f, "{}", cursor),
12              None => write!(f, "Cursor(genesis)"),
13          }
14      }
15  }