Re: Print value of selected-window in some info buffer

[Yuri Khan <yuri.v.khan@gmail.com>]

On Wed, 15 May 2024 at 04:26, Heime <heimeborgia@protonmail.com> wrote:
>
> How can the value of selected-window be printed in some info buffer ?
>
> Because I get a failure with (bdrive-insert (selected-window))

You are passing a window here…

> (defun bdrive-insert (objekt)
>   "TODO"
>
>   (with-current-buffer (get-buffer-create bfname)
>
>     (cond
>       ((stringp objekt)

… but here you test objekt for being a string, and if not, you skip
the insertion.

>          (insert (concat objekt "\n" ))) )))

If you want to print the window object’s default string
representation, like ‘#<window 669 on *scratch*>’, remove the stringp
test and use:

    (insert (format "%s\n" objekt))

If you want to print specific properties of the window, extract those
with the appropriate ‘window-*’ functions and pass them into ‘format’.
Provide placeholders in the format string for each value you print.


Also, learn to use the debugger so you can solve this and similar
issues yourself. Anywhere within the ‘bdrive-insert’ definition, type
‘C-u C-M-x’. This instruments your function to invoke the debugger
when called. Next, evaluate your ‘(bdrive-insert (selected-window))’
form. You get a window showing the function source, with point on the
first subexpression to be evaluated, likely ‘bfname’, echo area
showing its value. Type ‘n’ for ‘next’. Point moves to the next
expression in evaluation order. Do this until you get to ‘objekt’
(showing ‘#<window 669 on *scratch*>’) and then ‘(stringp objekt)’
(showing ‘nil’). At this point, you can see that a window is not a
string.