coloured console

[robstoll]

https://stackoverflow.com/questions/5762491/how-to-print-color-in-console-using-system-out-println

I am open for suggestions, the only thing I am opinionated is to use green for checkmarks and red for crosses in summary assertions.

[jGleitz]

I have personally used and would recommend jansi for any kind of escape sequence handling.

It has a nice API and automatically “strips ANSI escape codes if process output is being redirected and not attached to a terminal”.

Note: the application-wide AnsiConsole.systemInstall(); is not necessary. I usually use jansi through their AnsiConsole.out, and thus do not affect anything else.

Edit: I just realized that we are reporting errors through exceptions, not by directly printing them. That means, of course, that we cannot use jansi’s magic directly (we could use AnsiConsole.systemInstall();, though, but I do not like that).

However, we should definitely have logic that can handle the case that we are connected to a sink that does not support ANSI escape codes.

[robstoll]

In case of Scala we could use additionally
https://github.com/lihaoyi/PPrint