Noticeable blinking while typing

[cyangle]

I'm not sure if it's related to my setup or not.

I was connecting to a remote dev container with vscode and there's noticeable blinking using ic with vscode terminal. But I don't have this problem with the crystal repl.

Screen.Recording.2022-10-14.at.11.14.21.PM.mov

[I3oris]

Hello @cyangle, thank you reporting this!

Do you reproduce on a classical terminal emulator? I guess It too slow on the vscode terminal.
If you haven't already done it, you can try to build IC in release mode.

Maybe the --no-color could be a work around?

[cyangle]

It seems like a vscode problem. I turned on the local echo flag of the integrated terminal and it helps a lot.

Or maybe it's affected by project size.

I was trying ic with https://github.com/cyangle/stripe

Here's the cr file:
bin/console.cr

require "../src/stripe.cr"

Stripe.configure do |config|
  config.access_token = "sk_test_4eC39HqLyjWDarjtT1zdp7dc"
end

Stripe::ApiClient.default.default_headers["Stripe-Version"] = "2022-08-01"

api = Stripe::InvoiceitemsApi.new

il = api.get_invoiceitems

debugger

pp il

[I3oris]

On this commit, I've done several things that help to reduce blinking. Before, when typing a character, the screen was cleared up to the prompt, then some computations was done like re-highlight the expression, replace the cursor, then the expression was printed. Now the computations are done prior clearing the screen so the time between cleared screen and printed screen is extremely short. In addition (because seldom blinking was still present after that), I disallowed IO synchronization during the update, which almost killed the blinking on my side.

As soon I will release a new version of REPLy you would be able to see the changes in IC.