A "progress bar" for plyr's
A named base::list that can be passed as argument
.progressto any of plyr function accepting that argument.
One can use use
doFuture::registerDoFuture() to run plyr functions
in parallel, e.g.
plyr::l_ply(..., .parallel = TRUE). Unfortunately,
.parallel = TRUE disables progress updates because, internally,
.progress = "none" whenever
.parallel = TRUE.
Thus, despite the future ecosystem and progressr would support
it, it is not possible to run dplyr in parallel and get progress
updates at the same time.