blacken-region

[leezu]

When working with existing code, it is useful to only re-format a certain region of a file. It would be great if blacken could support re-formatting only the highlighted region of a file.

[EddyPronk]

c-indent-defun also calculates the region so it applies it to a block like a function or class.

[proofit404]

Hi, it will be good to have.

Can anyone make PR for it?

[wbolster]

see #25 for a wider discussion about this