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Re: describe-mode "some-mode"?


From: lee
Subject: Re: describe-mode "some-mode"?
Date: Sat, 30 Aug 2014 13:29:12 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)

Drew Adams <address@hidden> writes:

>> >> is there a function like describe-key which describes a mode specified
>> >> by the user?
>> >>
>> >> The docstring of describe-mode says it either describes the mode of the
>> >> current buffer or of the buffer given.  How can I get a description of a
>> >> mode without enabling the mode in a buffer?
>> >
>> > Something like this will get you started. For more info (e.g. to include
>> > minor-mode info) see the definition of `describe-mode'.  You could also
>> > improve the interactive spec, to use completion against major modes or
>> > something.
>> >
>> > (defun my-describe-mode (mode)
>> >   (interactive (list (intern (read-string "Mode: "))))
>> >   (with-help-window (help-buffer)
>> >     (with-current-buffer (help-buffer)
>> >       (insert (help-documentation mode nil 'ADD-HELP-BUTTONS)))))
>> 
>> Warning: the function `help-documentation' is not known to be defined.
>
> My bad.  Sometimes I forget what is provided from emacs -Q and what
> is from my code (I should have tested it with emacs -Q).
>
> `help-documentation' is defined in `help-fns+.el'
> (http://www.emacswiki.org/emacs-en/download/help-fns%2b.el).  It is
> like the vanilla function `documentation', but it uses
> `help-substitute-command-keys' so that keys mentioned in the help
> become links to their doc.
>
> Using only vanilla functions:
>
> (defun my-describe-mode (mode)
>   (interactive (list (intern (read-string "Mode: "))))
>   (with-help-window (help-buffer)
>     (with-current-buffer (help-buffer)
>       (insert (substitute-command-keys (documentation mode))))))

Thank you very much, that works fine! :)


-- 
GNU Emacs 24.4.50.2 (x86_64-unknown-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2014-08-17 on yun.yagibdah.de



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