Query Major Mode

Query Major Mode

[Tim Johnson]

Is there a way to query the major mode for a buffer?
Pointers to docs should suffice.
thnx
tj

-- 
Tim Johnson <tim@johnsons-web.com>
      http://www.alaska-internet-solutions.com

RE: Query Major Mode

[Drew Adams]

    Is there a way to query the major mode for a buffer?

There are lots of ways, depending on what you mean by query.  Does `C-h m'
do what you want?

    Pointers to docs should suffice.

`C-h i' Emacs

Re: Query Major Mode

[Tim Johnson]

> There are lots of ways, depending on what you mean by query.  Does `C-h m'
> do what you want?
 
  Oops! Poorly phrased question. My apologies. What I would like to
  do is perform this query programmatically. 

  Is that possible?

  Now perhaps I should elaborate in case I am barking up the wrong
  tree and there is a better way:

  Let's suppose I want to write a subroutine that first, queries
  the major mode, and then calls the appropriate subroutine for
  the mode.

  *pseudo-code* example:

(defun previous-subroutine ()
  (cond
    (eq major-mode "python")(previous-python-subroutine)
    (eq major-mode "C")(previous-C-subroutine)
    (eq major-mode "rebol")(previous-rebol-subroutine)
  ))

  ;; and then keymap of course.

  thanks
  tim

>     Pointers to docs should suffice.
> 
> `C-h i' Emacs
> 
> 
> 
> _______________________________________________
> Help-gnu-emacs mailing list
> Help-gnu-emacs@gnu.org
> http://lists.gnu.org/mailman/listinfo/help-gnu-emacs

-- 
Tim Johnson <tim@johnsons-web.com>
      http://www.alaska-internet-solutions.com

Re: Query Major Mode

[Peter Dyballa]

Am 21.07.2005 um 21:32 schrieb Tim Johnson:

>   Oops! Poorly phrased question. My apologies. What I would like to
>   do is perform this query programmatically.
>
>   Is that possible?
>

Describe-mode returns a lot of text, listing all minor-modes too. Then 
there is the mode-line -- and it uses a variable `mode-name´ -- I think 
that's it!

--
Greetings

   Pete

                   Sorry my terrible English, my native language Lisp!

Re: Query Major Mode

[Tim Johnson]

* Peter Dyballa <Peter_Dyballa@Web.DE> [050721 11:48]:
> 
> Am 21.07.2005 um 21:32 schrieb Tim Johnson:
> 
> >  Oops! Poorly phrased question. My apologies. What I would like to
> >  do is perform this query programmatically.
> >
> >  Is that possible?
> >
> 
> Describe-mode returns a lot of text, listing all minor-modes too. Then 
> there is the mode-line -- and it uses a variable `mode-name´ -- I think 
> that's it!
 
  Hi Peter:

    <grin> That's too easy.
    thanks

  tim
  
> --
> Greetings
> 
>   Pete
> 
>                   Sorry my terrible English, my native language Lisp!
> 

-- 
Tim Johnson <tim@johnsons-web.com>
      http://www.alaska-internet-solutions.com

RE: Query Major Mode

[Drew Adams]

      Let's suppose I want to write a subroutine that first, queries
      the major mode, and then calls the appropriate subroutine for
      the mode. *pseudo-code* example:

    (defun previous-subroutine ()
      (cond
        (eq major-mode "python")(previous-python-subroutine)
        (eq major-mode "C")(previous-C-subroutine)
        (eq major-mode "rebol")(previous-rebol-subroutine)
      ))

Wrap your conditions in parens, define your `previous-*' routines, and you
should be more or less good to go.

IOW, you query the major mode programmatically via variable `major-mode',
just as you have done - it's not pseudocode; it's code.

`M-x apropos RET major' shows you variable `major-mode'.

See node "Major Modes" in the Elisp manual (info: `C-h i') for lots of info
on major modes. (I wonder why they picked that name for the node?)

Re: Query Major Mode

[Kevin Rodgers]

Tim Johnson wrote:
> (defun previous-subroutine ()
>   (cond
>     (eq major-mode "python")(previous-python-subroutine)
>     (eq major-mode "C")(previous-C-subroutine)
>     (eq major-mode "rebol")(previous-rebol-subroutine)
>   ))

The value of major-mode is a symbol, e.g. python-mode.

The value of mode-name is a string, e.g. "Python".

-- 
Kevin Rodgers

Re: Query Major Mode

[drkm]

Tim Johnson writes:

> (defun previous-subroutine ()
>   (cond
>     (eq major-mode "python")(previous-python-subroutine)
>     (eq major-mode "C")(previous-C-subroutine)
>     (eq major-mode "rebol")(previous-rebol-subroutine)
>   ))

  You can also use something like:

    (defvar previous-subroutine-function 'previous-subroutine-default
      "...")
    (make-variable-buffer-local 'previous-subroutine-function)

    (defun previous-subroutine ()
      "..."
      (funcall previous-subroutine-function ...))

    (defun previous-python-subroutine ()
      ...)
    (add-hook 'python-mode-hook (lambda ()
                                  (setq previous-subroutine-function
                                        previous-python-subroutine)))

    ;; ...

  You can be interested in the mechanism CEDET provides to
overload functions in a per-mode basis.  Cfr. the documentation:
(info "(semantic-langdev)Semantic Overload Mechanism").

--drkm

Re: Query Major Mode

[Tim X]

Tim Johnson <tim@johnsons-web.com> writes:

> > There are lots of ways, depending on what you mean by query.  Does `C-h m'
> > do what you want?
>  
>   Oops! Poorly phrased question. My apologies. What I would like to
>   do is perform this query programmatically. 
> 
>   Is that possible?
> 
>   Now perhaps I should elaborate in case I am barking up the wrong
>   tree and there is a better way:
> 
>   Let's suppose I want to write a subroutine that first, queries
>   the major mode, and then calls the appropriate subroutine for
>   the mode.
> 
>   *pseudo-code* example:
> 
> (defun previous-subroutine ()
>   (cond
>     (eq major-mode "python")(previous-python-subroutine)
>     (eq major-mode "C")(previous-C-subroutine)
>     (eq major-mode "rebol")(previous-rebol-subroutine)
>   ))
> 
>   ;; and then keymap of course.
> 

You pseudo code pretty much has all the elements you need - there is a
variable called major-mode which you can use to do something based on
the mode you are in. However, I would suggest you check out using mode
hooks instead. Nearly all modes have a 'hook' you can set to do things
in a mode when it is loaded - this is the normal place to put mode
specific customizations. Many modes have multiple hooks that are run
at different times e.g. before loading the mode code, after loadinig
it etc. 

Tim


-- 
Tim Cross
The e-mail address on this message is FALSE (obviously!). My real e-mail is
to a company in Australia called rapttech and my login is tcross - if you 
really need to send mail, you should be able to work it out!

Re: Query Major Mode

[Peter Dyballa]

Am 21.07.2005 um 20:33 schrieb Tim Johnson:

> Is there a way to query the major mode for a buffer?
>

C-h m or describe-mode.

--
Greetings

   Pete

   It's not the valleys in life I dread so much as the dips.
		-- 	Garfield