Using nflreadr in packages

Re-exporting nflreadr functions

You can re-export nflreadr functions in your package by using the following roxygen template:

#' @inherit nflreadr::load_nextgen_stats
#' @export
# Need to add own examples if the function name is different
#' @examples
#' load_ng_stats(2020)
load_ng_stats <- nflreadr::load_nextgen_stats

Using progressr with from_url functions

The from_url family of functions can be adapted with the progressively() function decorator to signal progress. Here’s an example, adapted from the load_rosters() source code:

load_rosters <- function(seasons = 1999:2020){

  # Create a progressor function inside your function that knows how many "steps" there will be
  p <- progressr::progressor(steps = length(seasons)) 

  # Form the URLs to pass into rds_from_url
  urls <- paste0(

  # Use `progressively()` to wrap the existing function rds_from_url and 
  # call the `p()` progressor function as a signal immediately after each iteration
  out <- purrr::map_dfr(urls, progressively(rds_from_url,p))

This will cause p() to execute once for each rds_from_url call, effectively “signalling” progress.

In order to receive progress updates, the user must wrap the function (load_rosters, in this case) with progressr::with_progress() as shown here:


For more information, please see the progressr documentation.