aurrera

The aurrera package makes adding a progress bar easy. Inspired by tqdm Python package, a progress bar is just a single function call away. Wrap the object you iterate on with aurrrera::pb() and use it in most iterators like lapply().

If you need a fine control over your progress bars, use progressr package instead.

Installation

You can install the development version of aurrera from GitHub with:

# install.packages("devtools")
devtools::install_github("turtletopia/aurrera")

User guide

Suppose we have some slowly processing function and a vector we want to apply this function to:

library(aurrera)

slow_paste <- function(...) {
  Sys.sleep(.2)
  paste(..., collapse = "")
}

x <- lapply(seq(3), function(i) sample(letters, 4))

This is the usual call you’d make:

lapply(x, slow_paste)
#> [[1]]
#> [1] "pshz"
#> 
#> [[2]]
#> [1] "ufmd"
#> 
#> [[3]]
#> [1] "pqrl"

To add a progress bar, simply wrap x in pb():

lapply(pb(x), slow_paste)
#> ================================================================================
#> [[1]]
#> [1] "pshz"
#> 
#> [[2]]
#> [1] "ufmd"
#> 
#> [[3]]
#> [1] "pqrl"

These are some of the other iterators you can use aurrera with:

sapply(pb(x), slow_paste)
#> ================================================================================
#> [1] "pshz" "ufmd" "pqrl"

purrr::map_chr(pb(x), slow_paste)
#> ================================================================================
#> [1] "pshz" "ufmd" "pqrl"

parallel::mclapply(pb(x), slow_paste)
#> ================================================================================
#> [[1]]
#> [1] "pshz"
#> 
#> [[2]]
#> [1] "ufmd"
#> 
#> [[3]]
#> [1] "pqrl"

plyr::llply(pb(x), slow_paste)
#> ================================================================================
#> [[1]]
#> [1] "pshz"
#> 
#> [[2]]
#> [1] "ufmd"
#> 
#> [[3]]
#> [1] "pqrl"

Reduce(slow_paste, pb(x))
#> ================================================================================
#> [1] "p us fh mz d pp us fh mz d qp us fh mz d rp us fh mz d l"

purrr::reduce(pb(x), slow_paste)
#> ================================================================================
#> [1] "p us fh mz d pp us fh mz d qp us fh mz d rp us fh mz d l"

library(foreach)
foreach::foreach(el = pb(x)) %do% slow_paste(el)
#> ================================================================================
#> [[1]]
#> [1] "pshz"
#> 
#> [[2]]
#> [1] "ufmd"
#> 
#> [[3]]
#> [1] "pqrl"

However, progress bars do not appear when using the old plain for loop… unless you make the iteration manually:

x_pb <- pb(x)
v <- character()
for (i in seq_along(x_pb)) {
  # Pretend the operation below makes sense
  v <- c(slow_paste(x_pb[[i]]), v)
}
#> ================================================================================
v
#> [1] "pqrl" "ufmd" "pshz"

Known bugs

• Progress bars do not appear when iterating within for loop, i.e. for (el in pb(iterable)). Use manual iteration instead (as presented above).

End notes

I believe in equal rights and treatment for everybody, regardless of their sexuality, gender identity, skin tone, nationality, and other features beyond human control. Thus, I do not allow gglgbtq to be used in any project that promotes hate based on the aforementioned factors.