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I already use abbrev-mode to correct common typos, e.g. I have an abbrev setup for expanding functino to function, etc...

I'm currently writing a large document, and I keep stumbling over the decision whether to write "lifecycle" or "life-cycle", I decided to go with the former and add an abbreviation for "life-cycle" which would autocorrect it to "lifecycle". However, abbrev-mode is not able to expand over the - there and from what I understand there's no way to make abbrev-mode understand that.

Are there any alternatives out there that will make things like this work?

  • Why don't you use (query-replace-regexp "\\<life-cycle\\>" "lifecycle")? If you want to stick to abbrev-mode you could modify the syntax entry of - to word-constituent, i.e., "w", with the help of modify-syntax-entry. – Tobias Nov 15 '17 at 14:16
  • 1
    Well I don't want to replace all of the words after the fact, I want it to be immediate in order to prevent the problem altogether. I used to be able to do this in vim with abbreviations pretty easily. I'd rather not modify the syntax-entry for - because it would interfere with movement. Is there no alternative? – DeX3 Nov 15 '17 at 14:34
  • You do not need to modify the syntax table permanently. Just modify it temporarily while abbreviation takes place. I've demonstrated this in my answer. – Tobias Nov 15 '17 at 16:23
3

You can continue to use abbrev-mode. The following elisp snippet allows you to specify additional characters as word-consistent when abbreviation takes place.

After running the snippet customize the option abbrev-additional-chars with an alist that maps major-mode symbols to the lists of characters that should be interpreted as word-consistent during abbreviation.

The special mode symbol t corresponds to additional characters active in all modes.

The default value of abbrev-additional-chars is '((t ?-)) which covers your use-case.

You can install the snippet in your init file if you like.

(defcustom abbrev-additional-chars
  '((t ?-))
  "Alist that maps major mode symbols to lists of characters that may appear in abbreviations.
The chars of the special major mode symbol `t' are active in all modes."
  :group 'abbrev
  :type '(repeat :tag "List of modes"
                 (cons :tag "Map major mode symbols to lists of additional chars in abbrevs"
                       (symbol :tag "Mode symbol (`t' stands for all modes)")
                       (repeat :tag "List of additional word-consistent characters" character))))

(defvar-local T-abbrev-syntax-table nil
  "List of additional characters in abbreviations.")

(defun T-abbrev-mode-hook-fun ()
  "Populate T-abbrev-syntax-table with the local syntax table modfied by
the characters in `abbrev-additional-chars'."
  (when abbrev-mode
    (let ((char-list (append (cdr (assoc major-mode abbrev-additional-chars))
                             (cdr (assoc 't abbrev-additional-chars)))))
      (setq T-abbrev-syntax-table (make-syntax-table (syntax-table)))
      (mapcar (lambda (char)
                (modify-syntax-entry char "w" T-abbrev-syntax-table))
              char-list))))

;; Wrapping functions of the `abbrev` package with the local syntax table.
;; I'm not sure I captured all fun's that need to run with the local syntax-table.
;; Adding further functions is easy.
;; Just add them to the list at the end of the next form.
(mapcar
 (lambda (fun)
   (let ((newfun (intern (concat "T-ad-" (symbol-name fun)))))
     (eval
      `(progn
         (defun ,newfun (oldfun &rest args)
           ,(concat "This function evaluates `" (symbol-name fun) "' with `T-abbrev-syntax-table' as active syntax table.
It is used for the advicing `" (symbol-name fun) "'.")
           (with-syntax-table T-abbrev-syntax-table
             (apply oldfun args)
             ))
         (advice-add (quote ,fun) :around (quote ,newfun))))))
 '(define-mode-abbrev abbrev--before-point))

(add-hook 'abbrev-mode-hook #'T-abbrev-mode-hook-fun)
  • Hm, this seems to be just what I was looking for, however it seems to break a couple of things: When I try to type non-word characters in the minibuffer, I now get an error: (wrong-type-argument syntax-table-p nil) – DeX3 Nov 16 '17 at 8:29
  • I was able to make it work after some tinkering by wrapping the with-syntax-table call in an if to check whther or not T-abbrev-syntax-table is actually set. – DeX3 Nov 16 '17 at 10:08
  • @DeX3 I cannot reproduce the problem with the undefined syntax table in emacs 25.1.50.2. Could you give a receipt for error reproduction? Thanks in advance. – Tobias Nov 18 '17 at 11:31
  • @DeX3 Now I had the same error in a buffer with a major-mode basing on c-mode. I had a look at c-mode. It is actually not my fault that things go wrong. The problem is that they directly use (setq abbrev-mode t) in c-mode. Even the doc string of variable abbrev-mode says Use the command ‘abbrev-mode’ to change this variable.! But, it is clear that we have to handle this problem on our side. I will think about it. – Tobias Nov 19 '17 at 1:10
  • @DeX3 Note, that I filed a bug-report for c-mode. – Tobias Nov 19 '17 at 1:37

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