I3oris
commented
2 years ago Hello Vici37, thank you for coming with this.
The prompt starts instantaneously but then, the user get stuck (with no echo of its input) during the loading of the prelude. Adding the sleep 30 make the editing loop work correctly during these 30 second, but the prelude is only loaded after the delay and block the user until it finish. This end up to be just equivalent to display the prompt before loading prelude :/.
You can better see what happen (or when) with this:
spawn do
puts "load prelude"
load_prelude
puts "prelude loaded!"
end I have already thought to this problem before, but didn't found a easy solution. The main problem is that load_prelude will always be executed at once, with no way to execute code between (output echo, tabulation...). I think it's due to concurrency model.
Anyway, maybe just display the prompt before loading the prelude would be fine for now, it still better than wait before the prompt^^.
EDIT: This works fine with parallelism enabled! (flag -Dpreview_mt) Prelude is loaded in background while you can still edit the expression :grinning:.
The only thing to do then is to ensure than prelude is loaded before interpreting the code.
Vici37
Gist is that the stdlib could be more efficiently loaded in the background while the user is entering in their first line :) This cuts REPL startup time from ~1/2 second to instantaneously, and everything loads correctly.
I tested adding a
sleep 30in the spawn below to simulate user input before everything was loaded, and ended up seeing a much shorter list in the tab complete of what I could do (as expected). Waiting out the 30 seconds had everything load in the same session and tab complete "fixed" itself.