Add a command-line arg to output rationales along with check results?

Observed behaviour

The checks show a basic doc string in the cli output, for example:

Expected behaviour

There is additional information in the rationale that can be very helpful, for example:

When fixing FAILS and WARNS users sometimes need to look at the rationale in the source code to get more context on issues. It isn’t initially clear that you can or should do this.

We could add the rationale to the CLI output, which would make the output more verbose but might make using fontbakery easier for new users. For more experienced FontBakery users a flag could be used to hide the rationale part of the output.

[eliheuer]

Yeah, I like that, making it default would work. It would make it easier to notice when a rationale needs work and might push users to keep rationales updated and fill in the missing information.

[felipesanches]

I’d advocate for making it the default behaviour and then maybe add a --hide-rationale command-line arg.