Option to output the Reports as JSON to stdOut

[schriftgestalt]

instead of writing it to a file.

[schriftgestalt]

I’m hacking together something for myself. I’ll send a PR if I get it to work.

[simoncozens]

Thank you. I think it's a good idea.

[simoncozens]

Thinking about how this should appear in the command line, I guess the tidiest way to do it would be a kind of Unix-style -q --json - (only write the test output, write to - as stdout filename).

However, if you are thinking about using this as a way to get information into Glyphs.app, I think it would be worth a conversation about using fontspector-cli and creating a shared library to run the checks directly.

[schriftgestalt]

Happy to try to better integrate it. But is seems to work quite well. And to get the date from rust to objC it needs to be serialized to some c structures. So the detour through stdout is not so bad.