Is it possible to run formatter before saving?

[Stepan Bujnak]

I'm writing a lot of Go code. When editing a Go file in nano, I would like to run `goimports -w` which automatically formats the code right before saving. I can do that by binding it to a key combination, but I'm interested whether it would be possible to run the formatter automatically after pressing ^S or ^X and before saving the file. Thank you.