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I use an auto complete tool in emacs, which can complete brackets. But I want to find out that how it determines whether it should complete the bracket. For example, assuming | stands for the point. In the case of | abc, when typing (, it will auto complete to (|) abc. In another case of |abc , when typing (, it will not auto complete just like what sublime does.

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  • Possible duplicate of stackoverflow.com/questions/27142996/… – xuhdev Nov 23 '16 at 10:24
  • I had a hard time understanding the question, until I found | stands for the cursor. Not exactly what you want, but you can use M-( to insert a pair of parenthesis. – JeanPierre Nov 23 '16 at 14:11
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Add this line to your emacs init file

(setq electric-pair-preserve-balance nil)

Reference: https://stackoverflow.com/questions/27142996/electric-pair-mode-dont-pair-if-cursor-precedes-a-non-whitespace-character

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  • @xuhdex Thanks, but it didn't work in spacemacs. Should I modify something? – maple Nov 23 '16 at 10:34
  • Can it work under smartparens-mode? – maple Nov 23 '16 at 10:47
  • @maple It is for electric-pair-mode. I don't know how to do it in smartparens-mode, but you can certainly switch to electric-pair-mode (which is builtin). – xuhdev Nov 23 '16 at 19:03
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A possible way to do that:

(defun jp/insert-parentheses ()
"Insert a pair of parenthesis if next char is space or newline, or end of buffer"
  (interactive)
  (let ((c (char-after (point))))
    (cond
     ((or (not c) (= c 32) (= c 10)) (insert "()"))
     (t (insert "(")))))


(global-set-key "(" #'jp/insert-parentheses)

Where 32 is the code for a space character and 10 for newline. The not thing is for when point is at end of buffer (char-after will return nil, and we want to allow insertion of a pair of parenthesis in this case).

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The possible solution for this question I found is: 1) exclude the smartparens for it haven't support such a function. 

dotspacemacs-excluded-packages '(smartparens)

2) add electric package when init

(electric-pair-mode 1)
(setq electric-pair-preserve-balance nil)
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