progress is not updating the progress bar on a single line

[Moosquibe]

Hello,

I'm trying too use progress with IR kernel in jupyter and I keep getting an output like:

Any ideas on how to make it appear on a single line?

R version is 3.6.1
IRKernel is 1.1.1
progress is 1.2.2

[gaborcsardi]

It seems like it is not possible. What does this print for you?

{
  cat("foo")
  cat("\rbar\n")
}

[Moosquibe]

Just executing that block in a cell, I got

bar

[jgarces02]

Hi there,

I've got the same problem, with the following code...

pb <- progress_bar$new(total = length(filelist), format = "\nCorrecting divergent files [:bar] :percent eta: :eta")
    
for(i in 1:length(filelist)){
      pb$tick()
      aux <- read.table(filelist[i])
      
      Sys.sleep(1/100)
}

... and the output is a bit strange, multiline:

Correcting divergent files [>---------------------------------]   3% eta:  8s
Correcting divergent files [>---------------------------------]   4% eta:  6s
Correcting divergent files [=>--------------------------------]   6% eta:  9s
Correcting divergent files [=>--------------------------------]   7% eta:  9s
Correcting divergent files [==>-------------------------------]   8% eta: 10s
Correcting divergent files [==>-------------------------------]  10% eta: 12s
Correcting divergent files [===>------------------------------]  11% eta: 13s
Correcting divergent files [===>------------------------------]  13% eta: 15s
Correcting divergent files [====>-----------------------------]  14% eta: 14s
Correcting divergent files [====>-----------------------------]  15% eta: 17s
Correcting divergent files [=====>----------------------------]  17% eta: 18s
Correcting divergent files [=====>----------------------------]  18% eta: 22s
Correcting divergent files [======>---------------------------]  20% eta: 21s
Correcting divergent files [======>---------------------------]  21% eta: 20s
Correcting divergent files [=======>--------------------------]  23% eta: 19s
Correcting divergent files [=======>--------------------------]  24% eta: 18s
Correcting divergent files [========>-------------------------]  25% eta: 17s
Correcting divergent files [========>-------------------------]  27% eta: 16s
Correcting divergent files [=========>------------------------]  28% eta: 16s

Any idea what I'm doing wrong, please? Thanks in advance!

[lottedb-CS]

Hey @jgarces02 I believe your issue is caused by the newline "\n" in your format argument.
The newline is included every time the progress bar is updated and as such it appears on a new line every time.

If you do want a newline before the progress bar is printed (for instance if you are printing other things to the console beforehand) I would suggest including a newline before you start your progress bar. For instance:

pb <- progress_bar$new(total = length(filelist), format = "Correcting divergent files [:bar] :percent eta: :eta")

cat("\n")

for(i in 1:length(filelist)){
      pb$tick()
      aux <- read.table(filelist[i])
      
      Sys.sleep(1/100)
}

I hope this solves your issue (and potentially that of @Moosquibe as well)

[jgarces02]

Perfect, I catch it, I'll try as soon as possible. Thanks a lot for your help!