Emacs can do this with Ruby, Python... Hell, you can get it to eval buffer, region, line with anything that'll accept input and return a useful output. The eas

Emacs can do this with Ruby, Python... Hell, you can get it to eval buffer, region, line with anything that'll accept input and return a useful output. The ease at which one can get any language (or I/O machine) to play along with this workflow in Emacs is astonishing.