* Making a read-only buffer writable
@ 2023-09-12 9:08 Heime
2023-09-12 10:06 ` Philip Kaludercic
2023-09-12 10:26 ` Yuri Khan
0 siblings, 2 replies; 4+ messages in thread
From: Heime @ 2023-09-12 9:08 UTC (permalink / raw)
To: Heime via Users list for the GNU Emacs text editor
Have been reading the documentation, any time one wants to write (insert) into a
read-only buffer, one has to make it writable. Doesn't matter when that time is.
If it's read-only you need to make it writable to write into it.
Then I wonder how it is possible for the following function
to call
(insert-button "[1]"
and
(insert " Graphic Organisation")
without calling
(setq buffer-read-only nil)
first, just after
(with-help-window (help-buffer)
-------------
(defun maces ()
"Prints information about frames."
(interactive)
(with-help-window (help-buffer)
(insert-button "[1]" 'action
(lambda (button)
(setq buffer-read-only nil)
(insert "> Graphic Organisation \n\n")
(setq buffer-read-only t)))
(insert " Graphic Organisation") ))
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Making a read-only buffer writable
2023-09-12 9:08 Making a read-only buffer writable Heime
@ 2023-09-12 10:06 ` Philip Kaludercic
2023-09-12 10:26 ` Yuri Khan
1 sibling, 0 replies; 4+ messages in thread
From: Philip Kaludercic @ 2023-09-12 10:06 UTC (permalink / raw)
To: Heime; +Cc: Heime via Users list for the GNU Emacs text editor
Heime <heimeborgia@protonmail.com> writes:
> Have been reading the documentation, any time one wants to write (insert) into a
> read-only buffer, one has to make it writable. Doesn't matter when that time is.
> If it's read-only you need to make it writable to write into it.
>
> Then I wonder how it is possible for the following function
> to call
>
> (insert-button "[1]"
>
> and
>
> (insert " Graphic Organisation")
>
> without calling
>
> (setq buffer-read-only nil)
>
> first, just after
>
> (with-help-window (help-buffer)
>
> -------------
>
> (defun maces ()
> "Prints information about frames."
> (interactive)
>
> (with-help-window (help-buffer)
>
> (insert-button "[1]" 'action
> (lambda (button)
> (setq buffer-read-only nil)
> (insert "> Graphic Organisation \n\n")
> (setq buffer-read-only t)))
> (insert " Graphic Organisation") ))
The usual approach would be to do something like
(let ((inhibit-read-only t))
(insert "> Graphic Organisation \n\n"))
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Making a read-only buffer writable
2023-09-12 9:08 Making a read-only buffer writable Heime
2023-09-12 10:06 ` Philip Kaludercic
@ 2023-09-12 10:26 ` Yuri Khan
2023-09-12 10:52 ` Heime
1 sibling, 1 reply; 4+ messages in thread
From: Yuri Khan @ 2023-09-12 10:26 UTC (permalink / raw)
To: Heime; +Cc: Heime via Users list for the GNU Emacs text editor
On Tue, 12 Sept 2023 at 16:10, Heime <heimeborgia@protonmail.com> wrote:
> Then I wonder how it is possible for the following function
> to call
>
> (insert-button "[1]"
>
> without calling
>
> (setq buffer-read-only nil)
>
> first, just after
>
> (with-help-window (help-buffer)
Have you read the source for ‘with-help-window’? It arranges for
‘inhibit-read-only’ to be set to ‘t’ around the call to its body. Once
the body finishes, that temporary binding goes out of scope and
read-only is in effect again.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Making a read-only buffer writable
2023-09-12 10:26 ` Yuri Khan
@ 2023-09-12 10:52 ` Heime
0 siblings, 0 replies; 4+ messages in thread
From: Heime @ 2023-09-12 10:52 UTC (permalink / raw)
To: Yuri Khan; +Cc: Heime via Users list for the GNU Emacs text editor
------- Original Message -------
On Tuesday, September 12th, 2023 at 10:26 PM, Yuri Khan <yuri.v.khan@gmail.com> wrote:
> On Tue, 12 Sept 2023 at 16:10, Heime heimeborgia@protonmail.com wrote:
>
> > Then I wonder how it is possible for the following function
> > to call
> >
> > (insert-button "[1]"
> >
> > without calling
> >
> > (setq buffer-read-only nil)
> >
> > first, just after
> >
> > (with-help-window (help-buffer)
>
>
> Have you read the source for ‘with-help-window’? It arranges for
> ‘inhibit-read-only’ to be set to ‘t’ around the call to its body. Once
> the body finishes, that temporary binding goes out of scope and
> read-only is in effect again.
I have only read the Emacs Self Documentation with "C-h f". It would be helpful
to include the detail mentioned in the documentation string of the function, that
'inhibit-read-only' to be set to 't' around the call to its body. Otherwise, users
cannot be blamed for concluding that 'with-help-window' uses a read-only buffer,
and thusly have to reset 'inhibit-read-only'.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-09-12 10:52 UTC | newest]
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2023-09-12 9:08 Making a read-only buffer writable Heime
2023-09-12 10:06 ` Philip Kaludercic
2023-09-12 10:26 ` Yuri Khan
2023-09-12 10:52 ` Heime
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