Clear scrollback on terminal clear in watch mode

[ColCh]

Output grows really fast in watch mode, and after sometime it gets really hard to navigate through terminal output with scrollbar.

Clearing scrollback before each run will fix that.

OS X : hotkey is CMD+K. but in watch mode you fast get tired of pressing it each time

How to do it programmatically: printf '\e[3J' [1]

[1] VIA: http://apple.stackexchange.com/a/113168

P.S. It's only about watch mode

[cpojer]

We clear it every time we re-run tests. It just seems that terminals like iterm allow to scroll back up indefinitely.

I know @gaearon has done a ton of work with this.

[kentcdodds]

Hmmm... Interesting, when I hit CMD+K, it clears the terminal entirely and I can't scroll up (in contrast to the clear command which behaves similar to Jest's watch mode).

[ColCh]

@cpojer I'm using standart terminal app
@kentcdodds yes, that's the point, eliminate scrolling in watch mode

What you think guys?

[cpojer]

I'm happy to support this in Jest but I want to get some input from @gaearon first. Also, how does this behave on windows? Do we need to do a platform sniff and print different things or will this work on both?

[ColCh]

Tested on windows 7 cmd - printf '\e[3J' not works, but cls works

UPD echo -e '\e[3J' works on Ubuntu terminal nicely

[cpojer]

In this case, would you mind sending a PR with the new behavior for osx (and linux?) and the old one for windows? Can you double check it works well on linux, too?

[ColCh]

yes, but may be wait for @gaearon message? Interesting, what he can say on it

[gaearon]

Send a PR and I'll be happy to test it with a few edge cases I know have been broken in the past last time I tried to fix this.

[cpojer]

let's continue the conversation in the PR.

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