Re: Buttons in help buffer that displays contents of variables

[Stephen Berman]

On Sat, 22 Jul 2023 19:18:03 +0000 Heime <heimeborgia@protonmail.com> wrote:

> ------- Original Message -------
> On Sunday, July 23rd, 2023 at 2:40 AM, Heime <heimeborgia@protonmail.com> 
> wrote:
>
>
>> I want to use a button to display the contents of a variable inside
>> a help buffer, but the following gives
>>
>> (wrong-number-of-arguments ((t) nil "Function to be executed when the button
>> is clicked..." (interactive) (message "Button clicked!")) 1)
>> my-action(#<overlay from 1 to 8 in Help>)
>>
>
> Why does pressing the button give me such error ?
>
>>
>> (defconst myvar "Text of Front A")
>>
>> (defun my-action ()
>> "Function to be executed when the button is clicked."
>> (interactive)
>> (message "%s" myvar))
>>
>> (defun qrh ()
>> "Some description."
>>
>> (interactive)
>>
>> (with-help-window (help-buffer)
>> (insert-button "Front A" 'action 'my-action 'follow-link t)))

The error says the function my-action expects one argument, but you
defined it with an empty argument list.  If you don't want to use the
argument, you can use `_' as a placeholder for the required argument,
which will be ignored by the byte compiler:

(defun my-action (_)
  "Function to be executed when the button is clicked."
  (interactive)
  (message "%s" myvar))

Steve Berman