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Re: How to exclude a major mode from a hook

From: Fabrice Niessen
Subject: Re: How to exclude a major mode from a hook
Date: Wed, 11 Feb 2015 10:50:11 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (windows-nt)

Cecil Westerhof wrote:
> I had the following in my .emacs:
>     (add-hook 'before-save-hook 'delete-trailing-whitespace)
> But I also use Gnus and a signature starts with '-- ' and now the
> space is deleted and it is not a signature anymore.
> So I rewrote it to:
>     (add-hook 'before-save-hook (lambda () (when (not (string= major-mode 
> "message-mode"))
>                                              'delete-trailing-whitespace)))

I do have:

--8<---------------cut here---------------start------------->8---
  ;; Nuke all trailing whitespaces in the buffer.
  (add-hook 'before-save-hook
            (lambda ()                  ; Except for ...
              (unless (or (eq major-mode 'message-mode)
                                        ; ... where "-- " is the signature
                                        ; separator (for when using emacsclient
                                        ; to compose emails and doing C-x #).
                          (eq major-mode 'diff-mode))
                                        ; ... where the patch file can't be
                                        ; changed!
--8<---------------cut here---------------end--------------->8---

Best regards,

Fabrice Niessen
Leuven, Belgium

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