Re: Make new buffers into new frames

[Heime <heimeborgia@protonmail.com>]

On Monday, September 30th, 2024 at 4:41 PM, tomas@tuxteam.de <tomas@tuxteam.de> wrote:

> On Sun, Sep 29, 2024 at 07:31:07PM +0000, Heime wrote:
> 
> > Sent with Proton Mail secure email.
> > 
> > On Monday, September 30th, 2024 at 7:22 AM, tomas@tuxteam.de tomas@tuxteam.de wrote:
> > 
> > > On Sun, Sep 29, 2024 at 07:16:22PM +0000, Heime wrote:
> > > 
> > > [...]
> > > 
> > > > > > > 'action (display-message my-message "Info Buffer")
> > > 
> > > > > And now explain to us what kind of thing the function "insert-button"
> > > > > expects after the symbol 'action.
> > > > 
> > > > There is not much information in the manual about it. In the section
> > > > Button Properties, action states that it requires a function
> > > 
> > > Aha! A function. Now stop ten seconds: a function makes sense? Yes,
> > > kind of. To me at least.
> > > 
> > > And now: what are you giving to it?
> > 
> > I am currently giving it the command to print the text in some new buffer.
> 
> 
> No. You are not. What does your lisp do when it "sees" the expression
> 
> (+ 1 2)
> 
> ...and what is the result?

The result is 3, the value returned as the result of the entire expression.
 
> You put the expression
> 
> (display-message my-message "Info Buffer")
> 
> ...which gets evaluated on-the-spot, and returns... a window! (what you can
> confirm if you follow the code). So your insert-button invocation places a
> window in its 'action "place" and tries to call that window as if it were a
> function. This can't go well.
> 
> Thus the error message.
> 
> Once again. Try to wrap your head around the Lisp evaluation model. This will
> save you a lot of work long-term.

I understand.  The expression (display-message my-message "Info Buffer") is used 
to display the contents of a buffer (dbuffer) in a window.

The display-message function returns the window in which the buffer is displayed. 
Because of the last call. Because it evaluates the expression (display-buffer dbuffer),
which returns the window that is displaying the buffer dbuffer.

Then the correct way is 

'action (lambda (button)
          (display-message my-message "Info Buffer"))

Does one perform any operation with the button argument in the 
declared function or lambda ?

> Cheers
> --
> t