`tick(0)` doesn't show progress bar.

[burchill]

On the GitHub README, it says:

It is good practice to call tick(0) at the beginning of the computation or download, which shows the progress bar immediately.

And then immediately gives the following example:

pb <- progress_bar$new(total = 100)
f <- function() {
  pb$tick(0)
  Sys.sleep(3)
  for (i in 1:100) {
    pb$tick()
    Sys.sleep(1 / 100)
  }
}
f()

However, when I run that, it doesn't immediately show the progress bar, and instead only shows it after the three second sleep. I've included a reprex below:

library(progress)
pb <- progress_bar$new(total = 100)
f <- function() {
  pb$tick(0)
  Sys.sleep(3)
  for (i in 1:100) {
    pb$tick()
    Sys.sleep(1 / 100)
  }
}
f()

^{Created on 2020-07-27 by the reprex package (v0.3.0)}

Session info

``` r devtools::session_info() #> ─ Session info ─────────────────────────────────────────────────────────────── #> setting value #> version R version 3.6.1 (2019-07-05) #> os macOS Sierra 10.12.6 #> system x86_64, darwin15.6.0 #> ui X11 #> language (EN) #> collate en_US.UTF-8 #> ctype en_US.UTF-8 #> tz America/New_York #> date 2020-07-27 #> #> ─ Packages ─────────────────────────────────────────────────────────────────── #> package * version date lib source #> assertthat 0.2.1 2019-03-21 [1] CRAN (R 3.6.0) #> backports 1.1.4 2019-04-10 [1] CRAN (R 3.6.0) #> callr 3.3.1 2019-07-18 [1] CRAN (R 3.6.0) #> cli 2.0.2 2020-02-28 [1] CRAN (R 3.6.0) #> crayon 1.3.4 2017-09-16 [1] CRAN (R 3.6.0) #> desc 1.2.0 2018-05-01 [1] CRAN (R 3.6.0) #> devtools 2.2.1 2019-09-24 [1] CRAN (R 3.6.0) #> digest 0.6.25 2020-02-23 [1] CRAN (R 3.6.0) #> ellipsis 0.3.1 2020-05-15 [1] CRAN (R 3.6.2) #> evaluate 0.14 2019-05-28 [1] CRAN (R 3.6.0) #> fansi 0.4.1 2020-01-08 [1] CRAN (R 3.6.0) #> fs 1.3.1 2019-05-06 [1] CRAN (R 3.6.0) #> glue 1.4.1 2020-05-13 [1] CRAN (R 3.6.2) #> highr 0.8 2019-03-20 [1] CRAN (R 3.6.0) #> hms 0.5.3 2020-01-08 [1] CRAN (R 3.6.0) #> htmltools 0.3.6 2017-04-28 [1] CRAN (R 3.6.0) #> knitr 1.28 2020-02-06 [1] CRAN (R 3.6.0) #> magrittr 1.5 2014-11-22 [1] CRAN (R 3.6.0) #> memoise 1.1.0 2017-04-21 [1] CRAN (R 3.6.0) #> pkgbuild 1.0.5 2019-08-26 [1] CRAN (R 3.6.0) #> pkgconfig 2.0.3 2019-09-22 [1] CRAN (R 3.6.0) #> pkgload 1.0.2 2018-10-29 [1] CRAN (R 3.6.0) #> prettyunits 1.0.2 2015-07-13 [1] CRAN (R 3.6.0) #> processx 3.4.1 2019-07-18 [1] CRAN (R 3.6.0) #> progress * 1.2.2 2019-05-16 [1] CRAN (R 3.6.0) #> ps 1.3.0 2018-12-21 [1] CRAN (R 3.6.0) #> R6 2.4.0 2019-02-14 [1] CRAN (R 3.6.0) #> Rcpp 1.0.2 2019-07-25 [1] CRAN (R 3.6.0) #> remotes 2.1.0 2019-06-24 [1] CRAN (R 3.6.0) #> rlang 0.4.7 2020-07-09 [1] CRAN (R 3.6.2) #> rmarkdown 1.15 2019-08-21 [1] CRAN (R 3.6.0) #> rprojroot 1.3-2 2018-01-03 [1] CRAN (R 3.6.0) #> sessioninfo 1.1.1 2018-11-05 [1] CRAN (R 3.6.0) #> stringi 1.4.3 2019-03-12 [1] CRAN (R 3.6.0) #> stringr 1.4.0 2019-02-10 [1] CRAN (R 3.6.0) #> testthat 2.2.1 2019-07-25 [1] CRAN (R 3.6.0) #> usethis 1.5.1 2019-07-04 [1] CRAN (R 3.6.0) #> vctrs 0.3.1 2020-06-05 [1] CRAN (R 3.6.2) #> withr 2.1.2 2018-03-15 [1] CRAN (R 3.6.0) #> xfun 0.9 2019-08-21 [1] CRAN (R 3.6.0) #> yaml 2.2.0 2018-07-25 [1] CRAN (R 3.6.0) #> #> [1] /Library/Frameworks/R.framework/Versions/3.6/Resources/library ```

[lumiamitie]

Hello, I got exactly same problem. It seems that changes that occurred within a period of time don't seem to affect the progress bar. And I found that there is a parameter named show_after which has a default value of 0.2 (seconds). So I put Sys.sleep(0.2) after every tick and the problem was solved.

pb <- progress::progress_bar$new(total = 100)
f <- function() {
  pb$tick(0)
  Sys.sleep(0.2)
  for (i in 1:100) {
    pb$tick()
    Sys.sleep(0.2)
  }
}
f()

[burchill]

Ugggh, after dplyr recommended using this package, I thought it would be just as finished as dplyr's progress_estimated(), but it looks like I'll be sticking with dplyr for as long as I can.

[mike-lawrence]

This is still broken. Anyone have any ideas?

[gaborcsardi]

Set show_after to zero. I.e.

pb <- progress_bar$new(total = 100, show_after = 0)
f <- function() {
  pb$tick(0)
  Sys.sleep(3)
  for (i in 1:100) {
    pb$tick()
    Sys.sleep(1 / 100)
  }
}
f()

[mike-lawrence]

Thanks! I for sure tried that and it didn't work when I did, but it works now. Must have been something else in my code preventing or overwriting it. Sorry for the false alarm!