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Re: [PATCH] New command `outline-narrow-to-subtree'

From: Leo
Subject: Re: [PATCH] New command `outline-narrow-to-subtree'
Date: Fri, 19 Aug 2011 15:31:15 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.3.50 (Mac OS X 10.6.8)

On 2011-08-15 22:47 +0800, Bastien wrote:
>> That key seems to be already bound to show-subtree (emacs-23 here).
> Right.  I suggest using `C-c @ n' then.
>> C-x n s is a good key binding. There is no reason for org-mode to put
>> some of its commands in narrow-map which are only usable in org-mode.
> I assumed the purpose of `narrow-map' was to contain all commands
> related to narrowing, even if they are not globally available.  But 
> I'm probably wrong.
> Can some expert confirm this?
> If I'm wrong, then the `org-narrow-to-subtree' keybinding belongs to the
> `org-mode-map' the same way than `outline-narrow-to-subtree' belongs to
> the `outline-mode-map'.

How about something like this?

We add an interface function narrow-to-subtree which is bound globally
to C-x n s.

(defvar narrow-to-subtree-function nil
  "Function to call to narrow to a subtree.")

(defun narrow-to-subtree ()
  (if (functionp narrow-to-subtree-function)
      (funcall narrow-to-subtree-function)
    (error "Don't know how to narrow to a subtree in current buffer")))

then outline-mode, allout, org-mode and others can each provide its
specific narrow-to-subtree-function.



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