[Feature request] Custom shape

[thecaralice]

Would be cool to have other shapes available, e.g. famous donut.c; maybe even allow user to use custom shapes in some way

[diniremix]

...or as rohitdhas's shittier.

[fprasx]

This is actually really doable! Internally, the unformatter can generate a line of any length (we just set the desired length to 80 for block unformatting). So if you want to make shape, you just give it all the desired lengths you want, and then insert whitespace appproriately. I don't have time to work on this right now, but definitely might try it in the future :)