Fix Ctrl+C

[Brian Strauch (brianstrauch)]

Started using this package for the new confluent ai command. Ctrl+C becomes unusable after exiting (not sure if you're seeing this in confluent flink shell or not...) but there's an unmerged fix for it here: c-bata#239. This PR copies this commit over and I have already tested that it works!

[Yannick Pferr (YannickPferr)]

This breaks listening for CtrlC and other cancellation events in the flink shell, so I have to revert it.

To fix the issue you have with the ai command, you can instead save the terminal state before starting go-prompt, and then restore it to that state when exiting (that's what we did in flink shell). I can look into how to fix this inside of go-prompt directly in the future

[Gustavo de Morais (gustavodemorais)]

We actually had tried the same fix in the past and reverted it for the reason Yannick mentioned: #17

[Gustavo de Morais (gustavodemorais)]

Here's how we fixed it (what Yannick also mentioned we did for flink shell): https://github.com/confluentinc/cli/blob/main/pkg/flink/app/application.go#L68

We basically store stdinBefore before starting go-prompt and restore it as part of the cleanup when exiting go-prompt :) This way we had ctrl c not bugging and listening for keystrokes also works!

[Yannick Pferr (YannickPferr)]

Here's how you could do it for the ai command:
https://github.com/confluentinc/cli-internal/pull/103