rarity,
            name,
          });
        }

        Ok(Box::new(outputs))
      }
      Some(crate::index::List::Spent) => Err(anyhow!("output spent.")),
      None => Err(anyhow!("output not found")),
    }
  }
}

fn list(outpoint: OutPoint, ranges: Vec<(u64, u64)>) -> Vec<Output> {
  let mut offset = 0;
  ranges
    .into_iter()
    .map(|(start, end)| {
      let size = end - start;
      let output = Output {
        output: outpoint,
        start,
        end,
        size,
        offset,
        name: Sat(start).name(),
        rarity: Sat(start).rarity(),
      };

      offset += size;

      output
    })
    .collect()
}

#[cfg(test)]
mod tests {
  use super::*;

  fn output(
    output: OutPoint,
    start: u64,
    end: u64,
    size: u64,
    offset: u64,
    rarity: Rarity,
    name: String,
  ) -> super::Output {
    super::Output {
      output,
      start,
      end,
      size,
      offset,
      name,
      rarity,
    }
  }

  #[test]
  fn list_ranges() {
    let outpoint =