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Function `lisp-outline-level' in `emacs-lisp/lisp-mode.el'.


From: Lute Kamstra
Subject: Function `lisp-outline-level' in `emacs-lisp/lisp-mode.el'.
Date: 10 Jul 2002 20:12:14 +0200
User-agent: Gnus 5.9 on Emacs 21.2

Dear People,

I've been working on a substitute of the outline minor mode, so I
studied the implementation of this minor mode and its interaction with
some major modes.  In `emacs-lisp/lisp-mode.el' (Emacs 21.2),
`outline-regexp' and `outline-level' are set as follows:

  (setq outline-regexp ";;;;* \\|(")
  (setq outline-level 'lisp-outline-level)

The function `lisp-outline-level' is defined as:

  (defun lisp-outline-level ()
    "Lisp mode `outline-level' function."
    (if (looking-at "(")
        1000
      (looking-at outline-regexp)
      (- (match-end 0) (match-beginning 0))))

I'm a bit surprised by this.  It means that comments starting with
four semi-colons are less important then comments starting with three.
This is counter-intuitive to me.  I don't know if there are people
that have a coding style that involves comments that start with more
than three semi-colons, but I doubt that they would deem such comments
subordinate to comments starting with three.  The following definition
of `lisp-outline-level' would fix this problem:

  (defun lisp-outline-level ()
    "Lisp mode `outline-level' function."
    (if (looking-at "(")
        1000
      (looking-at outline-regexp)
      (- 100 (- (match-end 0) (match-beginning 0)))))

However, I do not like the fact that the number returned by the
function does not accurately reflect the level of the header in the
sense that the most important headers in a buffer are not assigned 1
and that there is a large gap in the range of the function.  I would
prefer to give all comments starting with three or more semi-colons
the same level number an define `lisp-outline-level' like:

  (defun lisp-outline-level ()
    "Lisp mode `outline-level' function."
    (if (looking-at "(")
        2
      1))

Regards,

  Lute Kamstra.

-- 
Lute Kamstra  <address@hidden>
CWI  department PNA4
Room M233  phone (+31) 20 592 4214



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