Keeping column when up/down

Keeping column when up/down

[Andreas Röhler]

Hi,

would like to keep the column at start when C-p resp. C-n

Tweaking previous-line?

Thanks,

Andreas

Re: Keeping column when up/down

[tomas]

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On Sun, Dec 11, 2016 at 06:34:59PM +0100, Andreas Röhler wrote:
> Hi,
> 
> would like to keep the column at start when C-p resp. C-n
> 
> Tweaking previous-line?

Is perhaps set-goal-column what you're looking for?

regards
- -- t
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Re: Keeping column when up/down

[Andreas Röhler]

On 11.12.2016 18:33, tomas@tuxteam.de wrote:
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> On Sun, Dec 11, 2016 at 06:34:59PM +0100, Andreas Röhler wrote:
>> Hi,
>>
>> would like to keep the column at start when C-p resp. C-n
>>
>> Tweaking previous-line?
> Is perhaps set-goal-column what you're looking for?
>
>

As goal-column is used otherwise too, seems not recommendable to change 
it WRT a vertical move.
AFAIU a tweak must keep the original value and restore it after move.

Re: Keeping column when up/down

[Eli Zaretskii]

> From: Andreas Röhler <andreas.roehler@easy-emacs.de>
> Date: Sun, 11 Dec 2016 19:45:53 +0100
> Cc: Help Gnu Emacs mailing list <help-gnu-emacs@gnu.org>
> 
> As goal-column is used otherwise too, seems not recommendable to change 
> it WRT a vertical move.

There's temporary-goal-column as well.

(Not that I understand how this is related to the original question,
since vertical motion tries to keep the column by default.)

Re: Keeping column when up/down

[Andreas Röhler]

On 11.12.2016 19:46, Eli Zaretskii wrote:
>> From: Andreas Röhler <andreas.roehler@easy-emacs.de>
>> Date: Sun, 11 Dec 2016 19:45:53 +0100
>> Cc: Help Gnu Emacs mailing list <help-gnu-emacs@gnu.org>
>>
>> As goal-column is used otherwise too, seems not recommendable to change
>> it WRT a vertical move.
> There's temporary-goal-column as well.
>
> (Not that I understand how this is related to the original question,
> since vertical motion tries to keep the column by default.)
>

Here it travels goal-column, when set.
Keeps column when goal-column is nil.

Looks like a bug.

Re: Keeping column when up/down

[Eli Zaretskii]

> Cc: Eli Zaretskii <eliz@gnu.org>
> From: Andreas Röhler <andreas.roehler@easy-emacs.de>
> Date: Sun, 11 Dec 2016 20:46:36 +0100
> 
> Keeps column when goal-column is nil.
> 
> Looks like a bug.

No, it's a feature (assuming I understood what you are complaining
about; sorry if I didn't).

Re: Keeping column when up/down

[Andreas Röhler]

On 11.12.2016 21:30, Eli Zaretskii wrote:
>> Cc: Eli Zaretskii <eliz@gnu.org>
>> From: Andreas Röhler <andreas.roehler@easy-emacs.de>
>> Date: Sun, 11 Dec 2016 20:46:36 +0100
>>
>> Keeps column when goal-column is nil.
>>
>> Looks like a bug.
> No, it's a feature (assuming I understood what you are complaining
> about; sorry if I didn't).
>

Thought at something like that:

(defun ar-previous-line (arg)
   "Moving ARG upwards.

Keep the column if possible. "
   (interactive "^p")
   (unless (bobp)
     (let ((col
        (if
            (eq last-command 'ar-previous-line)
            ar-vertical-move-start-column
          (setq ar-vertical-move-start-column (current-column)))))
       (previous-line arg arg)
       (when (< col (save-excursion (end-of-line) (current-column)))
     (move-to-column col)))))

Re: Keeping column when up/down

[Eli Zaretskii]

> From: Andreas Röhler <andreas.roehler@easy-emacs.de>
> Date: Sun, 11 Dec 2016 18:34:59 +0100
> 
> would like to keep the column at start when C-p resp. C-n
> 
> Tweaking previous-line?

Happens by default here.

Re: Keeping column when up/down

[Andreas Röhler]

On 11.12.2016 18:36, Eli Zaretskii wrote:
>> From: Andreas Röhler <andreas.roehler@easy-emacs.de>
>> Date: Sun, 11 Dec 2016 18:34:59 +0100
>>
>> would like to keep the column at start when C-p resp. C-n
>>
>> Tweaking previous-line?
> Happens by default here.
>

Hallo Eli,

sorry, don't understand your answer. Cursor travels goal-column of EOL 
if shorter.

Andreas

Re: Keeping column when up/down

[Eli Zaretskii]

> Cc: Eli Zaretskii <eliz@gnu.org>
> From: Andreas Röhler <andreas.roehler@easy-emacs.de>
> Date: Sun, 11 Dec 2016 19:43:53 +0100
> 
> >> would like to keep the column at start when C-p resp. C-n
> >>
> >> Tweaking previous-line?
> > Happens by default here.
> 
> Hallo Eli,
> 
> sorry, don't understand your answer. Cursor travels goal-column of EOL 
> if shorter.

And what did you want it to do instead?  There's no text beyond EOL.

(Your OP didn't mention EOL at all.)

Re: Keeping column when up/down

[Andreas Röhler]

On 11.12.2016 19:44, Eli Zaretskii wrote:
>> Hallo Eli,
>> sorry, don't understand your answer. Cursor travels goal-column of EOL
>> if shorter.
> And what did you want it to do instead?  There's no text beyond EOL.
>
> (Your OP didn't mention EOL at all.)
>

There was a typo, please read: travels goal-column or EOL.
EOL makes sense at empty lines. It also would make sense when line is 
shorter than column-at-start.

OTOH goal-colum seems unrelated to vertical move.