Add (broken) notional impl of selection-as-stdin
I'm not currently working on this. but I just wanted add a remark here that like was discussed earlier here, this PR is more of an example on how to implement stdin support, not something to be actually merged. So I'll convert this PR to a draft now.
Thank you @dathanb again for this example, I'll use it when I have time to look into this stdin feature (#89). It's also good for #64.
Just a short mention here, too. I've taken some example from this PR when implementing #64 / #275, and will take more example when implementing #89 / #283. I will probably not end up merging this particular PR, but just wanted to say that it will be utilized. 👍
I'll close this PR after #283 is released.
I'm closing this PR now, as #283 / 0.18.0 was released a couple of days ago. This code was not used, but in case any problems occur with #283, I might still come back here to check if there's something here that I could still learn from. 🙂