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Re: hideshow minor-mode

From: Michael Heerdegen
Subject: Re: hideshow minor-mode
Date: Tue, 16 Oct 2012 07:17:44 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.2.50 (gnu/linux)

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:

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]" "#"  

(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


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