cli: add validate command

[melsonic]

/fixes #2410

[alixander]

Awesome, thanks for taking this!

For the error case, can we just print out the errors without "failed to validate"? Technically, it successfully validated it to be incorrect.

For success, I always like printing something out to let users know their command worked. "Success! [x.d2] is valid D2."

Can you add a test to e2etests-cli please?

[melsonic]

Awesome, thanks for taking this!

For the error case, can we just print out the errors without "failed to validate"? Technically, it successfully validated it to be incorrect.

Yeah, we should be able to do that.

For success, I always like printing something out to let users know their command worked. "Success! [x.d2] is valid D2."

Sure, I also thought about that, for better ux.

Can you add a test to e2etests-cli please?

I'll look into it.

[melsonic]

Hey @alixander, should we print "Success! input is valid D2." in case of Stdin.

[alixander]

Can you sign your commits please? We have it as an org-wide setting

[melsonic]

Hey @alixander, updated the PR with signed commits and updated with your suggested changes.

[alixander]

LGTM!