无法将Enter绑定到Emacs中的'换行符和缩进!!! 很烦人

Question

Cannot get to bind Enter to newline-and-indent in Emacs !!! Very annoying.

I already tried everything on the following thread by changing 'mode' to ruby and still nothing:

How do I make Emacs auto-indent my C code?

I know that the problem is the RETURN key, since if I bind to something else, works fine. I tried [enter] , (kbd "enter") , (read-kbd-macro "enter") , (kbd "RET")

---

Follow-up 1.

This is what I get from Ch k RET

RET runs the command newline, which is an interactive compiled Lisp function.

It is bound to RET.

(newline &optional ARG)

Insert a newline, and move to left margin of the new line if it's blank. If use-hard-newlines' is non-nil, the newline is marked with the text-property hard'. With ARG, insert that many newlines. Call auto-fill-function' if the current column number is greater than the value of fill-column' and ARG is nil.

I dont know what to make of it or how to figure out if it's a global or local binding that gets in the way. trying to remap Cj also doesnt work.

Answer 1

As a previous comment says, use Ch k (describe-key) to see what the key is bound to at the point when it's not doing what you want. The (kbd "foo") syntax will be correct for whichever foo describe-key refers to it as.

Chances are that you are simply not defining that key in the appropriate keymap.

Note that major and minor mode keymaps take precedence over the global keymap, so you shouldn't necessarily be surprised if a global binding is overridden.

edit:

Myself, I have a hook function for common behaviours for all the programming modes I use, and it includes the sort of remapping you're after. The relevant part looks like this:

(defun my-coding-config ()
  (local-set-key (kbd "RET") (key-binding (kbd "M-j")))
  (local-set-key (kbd "<S-return>") 'newline)
  )

(mapc
 (lambda (language-mode-hook)
   (add-hook language-mode-hook 'my-coding-config))
 '(cperl-mode-hook
   css-mode-hook
   emacs-lisp-mode-hook
   ;; etc...
   ))

See Daimrod's answer for the explanation of why I'm re-binding RET to the current binding of Mj -- although I'm using comment-indent-new-line (or similar) instead of newline-and-indent (or similar), which does what I want in both comments and non-comments.

In Emacs 24, programming modes seem to derive from prog-mode , so you could probably (un-tested) reduce that list to prog-mode-hook plus any exceptions for third-party modes which don't yet do that.

Answer 2

As said earlier, use Ch k Cj because Cj is the standard key to do newline-and-indent .

If you open a new file, activate ruby-mode and try the previous command you will see why it doesn't work. Because ruby-mode doesn't have newline-and-indent but rather reindent-then-newline-and-indent . Yes that's stupid but you can either ask to the maintener to change it, or accept it.

However I suggest you to use Cj to do it because ruby-mode is not the only mode to do so, like paredit-mode which uses paredit-newline .