Add self-test mode like Anki works

[asakura42]

For example, if the answer is long or if you need to remember it in general. For example, to prepare for an exam where you do not need an absolutely accurate answer.

[ap4y]

I think it would be good to have and shouldn't be too hard to implement. I'll look into it when I'll get some free time.

[asakura42]

Pay attention to a similar project: https://github.com/gRastello/nao
Written in Go, but although at first glance your code looks more elaborate, it can offer alternative solutions to problems. For example, reading from csv is useful. Although it's one line of sed to remake csv into org, it would be easier not to doing this.

[ap4y]

nao looks interesting and it might be a better option for a terminal based reviews. Re csv: I personally think it's not an ideal format for decks due to lack of formatting options and potential complications you might have from the whitespace and commas. I will be happy to merge a PR for it but I'm not particularly interested in implementing it.