Customizing c-mode indentation behavior in Emacs 24.4

Question

Before Emacs 24.4, indentation in c-mode happened after typing things like ;, , and so on and I like this behavior.

But in Emacs 24.4, c-mode also indents on RET. This causes a lot of problems for me because if I want to insert a blank line, I need to press RET and then delete any spaces or tabs that electric- inserts.

So I would like to disable indent on RET, but keep all other electric-indent functionality, like indent on ;.

How can I achieve this?

I tried calling (electric-indent-local-mode -1) in c-mode hooks, but this disabled not only indent on RET, but also indent on ;, , and so on.

FWIW, the way I do it is that I hit RET either at the beginning of the next line, or at the of the previous line, depending on whether I just want to insert a blank line, or intend to actualy type text after thi RET. — Stefan, Nov 07 '14 at 14:22
FWIW, the [news for release 24.4](http://www.gnu.org/software/emacs/news/NEWS.24.4) notes that `electric-indent-mode` is now enabled by default; `RET` now inserts a newline and indents, while `C-j` inserts a newline but does not indent (basically swapping the functionality of `RET` and `C-j` from previous versions). — Dan, Nov 07 '14 at 14:36

paprika · Accepted Answer · 2014-11-07T17:47:20.407

4

You could rebind RET to electric-indent-just-newline like this:

(add-hook 'c-mode-hook
          (lambda() (local-set-key (kbd "<RET>") 'electric-indent-just-newline)))

edited Nov 07 '14 at 17:47

answered Nov 07 '14 at 01:52

paprika

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Please don't quote your lambdas. – Stefan Nov 07 '14 at 16:13
@Stefan: Thanks! I removed the redundant quote. – paprika Nov 07 '14 at 17:48

score 4 · Answer 2 · answered Nov 07 '14 at 14:20

4

You want to do:

 (add-hook 'c-mode-hook
           (lambda ()
             (setq-local electric-indent-chars
                         (remq ?\n electric-indent-chars))))

answered Nov 07 '14 at 14:20

Stefan

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Thanks, this looks more right solution, then rebinding RET. – fghj Nov 07 '14 at 15:53

score 0 · Answer 3 · answered Nov 07 '14 at 10:49

0

Can't you simply use C-j to insert empty lines on Emacs 24.4?

answered Nov 07 '14 at 10:49

mdallastella

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No, pressing enter is conditioned reflex, why I should change my head firmware, instead of computer firmware – fghj Nov 07 '14 at 10:52
Fortunately you're not a computer, I believe. :) – mdallastella Nov 07 '14 at 11:31
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@mdallastella: this response would probably be better as a comment on the question rather than an answer to it. – Dan Nov 07 '14 at 14:41
Drat: and by "response," I mean your original answer, not your commented response to OP's comment. – Dan Nov 07 '14 at 14:49
You're right, but I thought the op didn't know about C-j. – mdallastella Nov 08 '14 at 16:05

Customizing c-mode indentation behavior in Emacs 24.4

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