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RE: If arg, open in new frame

From: Tory S. Anderson
Subject: RE: If arg, open in new frame
Date: Wed, 10 Sep 2014 08:02:30 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

So, that half answered my question: thanks for showing me how to use optional 
args. My function is now:

(defun go-or-make-agenda (&optional new-frame) (interactive "P")
  (let ((buffer "\*Org Agenda\*"))
    (if (get-buffer buffer)
        (switch-to-buffer buffer)

But I actually don't know how to open this in a new frame. I guess I should 
have given my more specific use case:

I use this function to check my calendar. Sometimes, I want to do that without 
losing what I have open right now (especially when I'm reading an email in Gnus 
that asks me about an appointment). Right now I have to respond with, `C-x 5 2 
M-x go-or-make-agenda` (the function actually being bound to <F8>). I'd like to 
shorten this effort to just doing `C-u <F8>`. Google is not readily serving me 
for how to open in another frame in elisp. 

>Date: Wed, 10 Sep 2014 00:44:20 +0200
>From: Emanuel Berg <address@hidden>
>address@hidden (Tory S. Anderson) writes:
>> I have a function that checks for a buffer and either
>> switches to it or creates it. I want it to optionally
>> take an arg, and if an arg is supplied, open/find
>> said buffer in a new frame. My elisp-fu is still
>> young; can you help?
>> Function:
>> (defun go-or-make-agenda () (interactive)
>>   (if (get-buffer "\*Org Agenda\*")
>>       (switch-to-buffer "\*Org Agenda\*")
>>     (org-agenda-list)))
>Hint: As the data "\*Org Agenda\*" appears twice, put
>that in a `let' and have it appear once, then use the
>`let' binding all you want.
>As for your question, I think you can solve the frame
>stuff (I didn't exactly understand your motive but it
>doesn't matter), but take a look below for an optional
>(prefix) argument. Then just put it together.
>(defun go-or-make-agenda (&optional new-frame)
>  (interactive "P")
>  (if new-frame (message "frame")
>    (message "no frame") ))
>;; from Elisp
>(go-or-make-agenda)       ; no frame
>(go-or-make-agenda nil)   ; no frame
>(go-or-make-agenda t)     ; frame
>;; interactively
>M-x go-or-make-agenda RET     ; no frame
>C-u M-x go-or-make-agenda RET ; frame
>underground experts united

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