This post continues a topic that was introduced in smarter open-line few months back.

Often when editing code one wishes to open a line just above the current one, which is properly indented relative to the existing code, and position the cursor at its beginning. Such a feature is present in most IDEs, such as IntelliJ IDEA, Eclipse and NetBeans. It’s sometimes bound to Control+Shift+Enter. Last time I showed you how to implement a similar function called smart-open-line, this time we will implement smart-open-line-above. Just add this snippet to your .emacs (or .emacs.d/init.el or whatever):

(defun smart-open-line-above ()
  "Insert an empty line above the current line.
Position the cursor at it's beginning, according to the current mode."
  (move-beginning-of-line nil)
  (forward-line -1)

(global-set-key [(control shift return)] 'smart-open-line-above)

Evaluate the code (or restart Emacs) and you’ll be able to use M-x smart-open-line-above or Control+Shift+Enter (aka C-S-return).

Admittedly this keybinding kind of sucks, so here’s another option for you - M-o (used by default as the prefix for some font setting commands nobody ever uses) for smart-open-line and M-O for smart-open-line-above.

(global-set-key (kbd "M-o") 'smart-open-line)
(global-set-key (kbd "M-O") 'smart-open-line-above)

Another good option would be to fold the two commands into one and use a prefix argument to trigger the opening a new line above the current one.

These commands are available in crux as crux-smart-open-line-above and crux-smart-open-line. These commands are also available in prelude via the crux package.