* How to set margins of buffer when window changes?
@ 2021-09-08 17:12 edgar
2021-09-08 19:11 ` Joost Kremers
2021-09-08 19:17 ` Emanuel Berg via Users list for the GNU Emacs text editor
0 siblings, 2 replies; 6+ messages in thread
From: edgar @ 2021-09-08 17:12 UTC (permalink / raw)
To: help-gnu-emacs
Hello dear Emacs users!
I am trying to have some buffers centre the text. I figured that I
could do it with margins. I want this to adjust depending on the value
of `fill-column' (could be any other variable) and the width of the
window (if it is too small, don't centre). I have the code below, but
I get the error: `Window ... too small for splitting' (replace `...'
with the name of the buffer's window). I added a hook to the major
mode list of hooks, but it could be something else.
The format is very similar to what they seek here:
[https://stackoverflow.com/q/39083118]
How can I resize the window and adjust the margins depending on
`fill-column'? Thanks.
(with-eval-after-load 'python
(defun centre-text-with-margins (&optional window width)
"Moves the left and right margins to centre the contents of
the current buffer in the current window"
;; https://stackoverflow.com/a/54098261
;; https://stackoverflow.com/q/39083118
;; (if (or (> left-margin-width 0) (> right-margin-width 0))
;; (progn
(setq left-margin-width 0)
(setq right-margin-width 0)
;; (set-window-buffer nil (current-buffer))
(set-window-margins window 0 0)
;; ))
(let* ((txtwidth (cond (width) (fill-column)))
(space (max 0 (- (window-total-width) txtwidth)))
(leftside (floor (/ space 2)))
(rightside (- space leftside)))
(setq left-margin-width leftside)
(setq right-margin-width rightside)
(set-window-buffer window (current-buffer))
(format "lm:%s rm:%s sp:%s" left-margin-width
right-margin-width space)))
(defun py-margins-hook ()
(add-hook 'window-state-change-hook #'centre-text-with-margins t t))
(add-hook 'python-mode-hook 'py-margins-hook))
Emacs:
GNU Emacs 27.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.27,
cairo version 1.17.4) of 2021-03-26
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: How to set margins of buffer when window changes?
2021-09-08 17:12 How to set margins of buffer when window changes? edgar
@ 2021-09-08 19:11 ` Joost Kremers
2021-09-08 20:57 ` edgar
2021-09-08 19:17 ` Emanuel Berg via Users list for the GNU Emacs text editor
1 sibling, 1 reply; 6+ messages in thread
From: Joost Kremers @ 2021-09-08 19:11 UTC (permalink / raw)
To: edgar; +Cc: help-gnu-emacs
On Wed, Sep 08 2021, edgar@openmail.cc wrote:
> I am trying to have some buffers centre the text. I figured that I could do it
> with margins. I want this to adjust depending on the value of `fill-column'
> (could be any other variable) and the width of the window (if it is too small,
> don't centre).
I've written a minor mode that does this:
https://github.com/joostkremers/visual-fill-column
To centre the text, set `visual-fill-column-center-text` to `t`.
Feel free to adapt the code to your needs or simply use it for inspiration. :-)
--
Joost Kremers
Life has its moments
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: How to set margins of buffer when window changes?
2021-09-08 17:12 How to set margins of buffer when window changes? edgar
2021-09-08 19:11 ` Joost Kremers
@ 2021-09-08 19:17 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-09-08 19:27 ` Emanuel Berg via Users list for the GNU Emacs text editor
1 sibling, 1 reply; 6+ messages in thread
From: Emanuel Berg via Users list for the GNU Emacs text editor @ 2021-09-08 19:17 UTC (permalink / raw)
To: help-gnu-emacs
edgar wrote:
> I have the code below, but I get the error: `Window ... too
> small for splitting' (replace `...'
But that code doesn't work (at all), for example what is
"window", "(width)", and "(fill-column)"?
Also please remove the commented-out lines ...
--
underground experts united
https://dataswamp.org/~incal
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: How to set margins of buffer when window changes?
2021-09-08 19:17 ` Emanuel Berg via Users list for the GNU Emacs text editor
@ 2021-09-08 19:27 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-09-08 19:41 ` Emanuel Berg via Users list for the GNU Emacs text editor
0 siblings, 1 reply; 6+ messages in thread
From: Emanuel Berg via Users list for the GNU Emacs text editor @ 2021-09-08 19:27 UTC (permalink / raw)
To: help-gnu-emacs
>> I have the code below, but I get the error: `Window ... too
>> small for splitting' (replace `...'
>
> But that code doesn't work (at all), for example what is
> "window", "(width)", and "(fill-column)"?
OK, now I see, "window" is window! (I didn't see it because
I've never seen a `defun' inside a `with-eval-after-load'.)
(fill-column) is also correct because it isn't a function but
a `cond' clause ...
But (width) still doesn't work, it should look like
this, right?
(cond (width (fill-column)))
If so, it is even better to use `when' here:
(when width
(fill-column) )
--
underground experts united
https://dataswamp.org/~incal
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: How to set margins of buffer when window changes?
2021-09-08 19:27 ` Emanuel Berg via Users list for the GNU Emacs text editor
@ 2021-09-08 19:41 ` Emanuel Berg via Users list for the GNU Emacs text editor
0 siblings, 0 replies; 6+ messages in thread
From: Emanuel Berg via Users list for the GNU Emacs text editor @ 2021-09-08 19:41 UTC (permalink / raw)
To: help-gnu-emacs
> (when width
> (fill-column) )
Heh, I'm completely confused today, you will have to read what
I *think*, not what I type ... it should be `or'!
(or width fill-column)
Anyway here is the complete, fixed function. I don't know if
the computation is correct (I didn't change that) but it is
a good starting point ...
Note that I renamed it!
(defun center-text-with-margins (&optional window width)
(let ((win (or window (selected-window)))
(wid (or width fill-column) ))
(let*((space (max 0 (- (window-total-width) wid)))
(left (floor (/ space 2)))
(right (- space left)) )
(set-window-margins win left right)
(set-window-buffer win (current-buffer)) )))
--
underground experts united
https://dataswamp.org/~incal
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: How to set margins of buffer when window changes?
2021-09-08 19:11 ` Joost Kremers
@ 2021-09-08 20:57 ` edgar
0 siblings, 0 replies; 6+ messages in thread
From: edgar @ 2021-09-08 20:57 UTC (permalink / raw)
To: Joost Kremers; +Cc: help-gnu-emacs
On 2021-09-08 19:11, Joost Kremers wrote:
>
> I've written a minor mode that does this:
>
> https://github.com/joostkremers/visual-fill-column
>
> To centre the text, set `visual-fill-column-center-text` to `t`.
>
> Feel free to adapt the code to your needs or simply use it for
> inspiration. :-)
This is all that I need. Thank you very much. I would recommend adding
your answer here: https://stackoverflow.com/q/39083118
https://stackoverflow.com/a/54098261 (I don't know how they make their
money nor if you agree with that, but I've heard that people some times
get royalties from websites :) ).
Thanks again!
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^ permalink raw reply [flat|nested] 6+ messages in thread
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2021-09-08 17:12 How to set margins of buffer when window changes? edgar
2021-09-08 19:11 ` Joost Kremers
2021-09-08 20:57 ` edgar
2021-09-08 19:17 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-09-08 19:27 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-09-08 19:41 ` Emanuel Berg via Users list for the GNU Emacs text editor
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