Paging during the command execution

[astrozot]

I am not sure this is possible, but it would be extremely useful to have TerminalPager work during the execution of a slow command. That would allow one, for example, to monitor the execution of slow scripts on remote servers.

[ronisbr]

Hi @astrozot !

This feature would be awesome, indeed! I think we can do this by using tasks and stdout redirection. Do you have an example of such slow process by any change so I can use it to test?

[astrozot]

Hi @ronisbr ,

thank you for your quick reply! Sure, here is a very simple function for your tests:

function f(n)
    for i in 1:n
        println(i)
        sleep(1)
    end
    println("done")
end

Ideally, one would like to see the output of @stdout_to_pager f(5) immediately, rather than after 5 seconds.

Thank you again and let me know if I can help any further.

[ronisbr]

The problem with that code is that it yields during println and sleep. For some other workload that does not yield, the task with TerminalPager will be locked. I will investigate if there is some workaround.

[astrozot]

Hi @ronisbr , sorry for the slow reaction, I missed your comment. I understand your point, but the current version of the TerminalPager does not show any output even if the code yields, as in my example. Still, arguably, the most interesting use cases would not have a sleep command that yield un their codes...