Re: hideshow minor-mode

[Shiyuan <gshy2014@gmail.com>]

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Michael,
That works. Thank you very much for guiding me into the world of Lisp.

Shiyuan

On Tue, Oct 16, 2012 at 12:17 AM, Michael Heerdegen <
michael_heerdegen@web.de> wrote:

> Hi again,
>
> > Michael,
> > Thanks for the detailed reply. However, it doesn't work for me. I
> > guess I make a mistake somewhere. Here is mymode.el:
> >
> > http://paste.lisp.org/display/132611
>
> Yes, there are two little errors.
>
> First, you register your mode in `hs-special-modes-alist' after you
> enable hs-minor-mode.  That's too late, because hideshow then has
> already initialized its stuff.  Also, adding to `hs-special-modes-alist'
> has to be done only once, and not every time mymode is enabled.
>
> Second, you quoted mymode-forward-sexp-func in your quoted list:
>
> | '(mymode "\\[begin]" "\\[end]" "#"  'mymode-forward-sexp-func nil))
>                                       ^
>
> That's not needed, remember, the quote before a list already prevents
> evaluation of its members (you want to specify a symbol).
>
> So, this should do the trick:
>
> --8<---------------cut here---------------start------------->8---
> (require 'hideshow)
>
> (defun mymode-forward-sexp-func (arg)
>   "move over ARG balanced blocks; This is needed by hs-minor-mode"
>   (dotimes (number arg)
>     (let ((counter 0))
>       (catch 'done
>         (while t
>           (search-forward-regexp "\\[begin]\\|\\[end]")
>           (setq counter (+ counter (if (looking-back "\\[begin]") 1 -1)))
>           (when (= counter 0) (throw 'done t)))))))
>
> (add-to-list 'hs-special-modes-alist '(mymode "\\[begin]" "\\[end]" "#"
>  mymode-forward-sexp-func))
>
> (define-derived-mode mymode fundamental-mode
>   "mymode is a major mode for fun."
>   (setq mode-name "mymode")
>   (setq comment-start "#")
>   (setq comment-end "")
>   (hs-minor-mode 1))
> --8<---------------cut here---------------end--------------->8---
>
> Of course, that's all just for playing.  If mymode was a major-mode
> really to be used, you would leave it up to the user to call
> `hs-minor-mode' e.g. in `mymode-hook', and not call it in the mode
> definition.
>
>
> Michael.
>
>

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