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Subject: bug#52417: Mark ring navigation could be two-way
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Other tools has similar features like the mark ring and they
provide two-way navigation, so you can go back to some previous
position to check something, and then you can go forward in the
ring to get back to a more recent position or the latest position
if you want.

Emacs could have this too by providing a command which allows
moving forward in the mark ring.

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To: ndame <laszlomail@HIDDEN>
Subject: bug#52417: Acknowledgement (Mark ring navigation could be two-way)
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Date: Fri, 10 Dec 2021 21:21:01 +0000

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Subject: bug#52417: Mark ring navigation could be two-way
Resent-From: Daniel =?UTF-8?Q?Mart=C3=ADn?= <mardani29@HIDDEN>
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Date: Sat, 11 Dec 2021 16:44:13 +0100
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 (ndame via's message of "Fri, 10 Dec 2021 21:20:06 +0000")
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ndame via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs@HIDDEN> writes:

> Other tools has similar features like the mark ring and they
> provide two-way navigation, so you can go back to some previous
> position to check something, and then you can go forward in the
> ring to get back to a more recent position or the latest position
> if you want.
>
> Emacs could have this too by providing a command which allows
> moving forward in the mark ring.

+1.  I agree that this is a useful feature that would improve the text
editing capabilities of Emacs.  In Vim, you can use C-i and C-o to
navigate forwards and backwards, respectively.

A similar thing happens with the kill-ring.  M-y moves the last-yank
pointer in one direction, but there could be a command to move it in the
opposite direction.  Even if the mark and kill ring cycle, it is
inconvenient to browse them in one direction only, because as modern
computers have more memory available, the rings can store more things.

This is probably one of the reasons why there are a lot of external
packages that let you browse the contents of the mark-ring and kill-ring
in the minibuffer or a separate buffer.

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#52417: Mark ring navigation could be two-way
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Date: Sat, 11 Dec 2021 16:44:13 +0100
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 (ndame via's message of "Fri, 10 Dec 2021 21:20:06 +0000")
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ndame via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs@HIDDEN> writes:

> Other tools has similar features like the mark ring and they
> provide two-way navigation, so you can go back to some previous
> position to check something, and then you can go forward in the
> ring to get back to a more recent position or the latest position
> if you want.
>
> Emacs could have this too by providing a command which allows
> moving forward in the mark ring.

+1.  I agree that this is a useful feature that would improve the text
editing capabilities of Emacs.  In Vim, you can use C-i and C-o to
navigate forwards and backwards, respectively.

A similar thing happens with the kill-ring.  M-y moves the last-yank
pointer in one direction, but there could be a command to move it in the
opposite direction.  Even if the mark and kill ring cycle, it is
inconvenient to browse them in one direction only, because as modern
computers have more memory available, the rings can store more things.

This is probably one of the reasons why there are a lot of external
packages that let you browse the contents of the mark-ring and kill-ring
in the minibuffer or a separate buffer.

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Date: Sat, 11 Dec 2021 20:34:31 +0200
In-Reply-To: <m1wnkbkuya.fsf@HIDDEN> ("Daniel =?UTF-8?Q?Mart=C3=ADn?=
 via \"Bug reports for
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>> Other tools has similar features like the mark ring and they
>> provide two-way navigation, so you can go back to some previous
>> position to check something, and then you can go forward in the
>> ring to get back to a more recent position or the latest position
>> if you want.
>>
>> Emacs could have this too by providing a command which allows
>> moving forward in the mark ring.
>
> +1.  I agree that this is a useful feature that would improve the text
> editing capabilities of Emacs.  In Vim, you can use C-i and C-o to
> navigate forwards and backwards, respectively.
>
> A similar thing happens with the kill-ring.  M-y moves the last-yank
> pointer in one direction, but there could be a command to move it in the
> opposite direction.  Even if the mark and kill ring cycle, it is
> inconvenient to browse them in one direction only, because as modern
> computers have more memory available, the rings can store more things.
>
> This is probably one of the reasons why there are a lot of external
> packages that let you browse the contents of the mark-ring and kill-ring
> in the minibuffer or a separate buffer.

After enabling repeat-mode, this browses the kill-ring with
'M-y up down up down ...'

  (defvar yank-pop-repeat-map
    (let ((map (make-sparse-keymap)))
      (define-key map "\M-y" 'yank-pop)
      (define-key map [up] 'yank-pop)
      (define-key map [down] (lambda ()
                               (interactive)
                               (setq repeat-map 'yank-pop-repeat-map)
                               (yank-pop -1)))
      map)
    "Keymap to repeat `yank-pop' key sequences.  Used in `repeat-mode'.")

  (put 'yank-pop 'repeat-map 'yank-pop-repeat-map)

The same can be created for the mark-ring.

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 via \"Bug reports for
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>> Other tools has similar features like the mark ring and they
>> provide two-way navigation, so you can go back to some previous
>> position to check something, and then you can go forward in the
>> ring to get back to a more recent position or the latest position
>> if you want.
>>
>> Emacs could have this too by providing a command which allows
>> moving forward in the mark ring.
>
> +1.  I agree that this is a useful feature that would improve the text
> editing capabilities of Emacs.  In Vim, you can use C-i and C-o to
> navigate forwards and backwards, respectively.
>
> A similar thing happens with the kill-ring.  M-y moves the last-yank
> pointer in one direction, but there could be a command to move it in the
> opposite direction.  Even if the mark and kill ring cycle, it is
> inconvenient to browse them in one direction only, because as modern
> computers have more memory available, the rings can store more things.
>
> This is probably one of the reasons why there are a lot of external
> packages that let you browse the contents of the mark-ring and kill-ring
> in the minibuffer or a separate buffer.

After enabling repeat-mode, this browses the kill-ring with
'M-y up down up down ...'

  (defvar yank-pop-repeat-map
    (let ((map (make-sparse-keymap)))
      (define-key map "\M-y" 'yank-pop)
      (define-key map [up] 'yank-pop)
      (define-key map [down] (lambda ()
                               (interactive)
                               (setq repeat-map 'yank-pop-repeat-map)
                               (yank-pop -1)))
      map)
    "Keymap to repeat `yank-pop' key sequences.  Used in `repeat-mode'.")

  (put 'yank-pop 'repeat-map 'yank-pop-repeat-map)

The same can be created for the mark-ring.

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Date: Sat, 11 Dec 2021 20:11:50 +0000
In-Reply-To: <m1wnkbkuya.fsf@HIDDEN> ("Daniel =?UTF-8?Q?Mart=C3=ADn?= via
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Daniel Mart=C3=ADn via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs@HIDDEN> writes:

> ndame via "Bug reports for GNU Emacs, the Swiss army knife of text
> editors" <bug-gnu-emacs@HIDDEN> writes:
>
>> Other tools has similar features like the mark ring and they
>> provide two-way navigation, so you can go back to some previous
>> position to check something, and then you can go forward in the
>> ring to get back to a more recent position or the latest position
>> if you want.
>>
>> Emacs could have this too by providing a command which allows
>> moving forward in the mark ring.
>
> +1.  I agree that this is a useful feature that would improve the text
> editing capabilities of Emacs.  In Vim, you can use C-i and C-o to
> navigate forwards and backwards, respectively.
>
> A similar thing happens with the kill-ring.  M-y moves the last-yank
> pointer in one direction, but there could be a command to move it in the
> opposite direction.  Even if the mark and kill ring cycle, it is
> inconvenient to browse them in one direction only, because as modern
> computers have more memory available, the rings can store more things.
>
> This is probably one of the reasons why there are a lot of external
> packages that let you browse the contents of the mark-ring and kill-ring
> in the minibuffer or a separate buffer.

Regarding M-y, you can use negative prefixes to move in the opposite
direction.

Regarding the mark ring, I don't think it's possible.  If indeed it's
not, I think it's a good idea to add such functionality.


--=20
Andr=C3=A9 A. Gomes
"Free Thought, Free World"

Message sent to bug-gnu-emacs@HIDDEN:

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Date: Sat, 11 Dec 2021 20:11:50 +0000
In-Reply-To: <m1wnkbkuya.fsf@HIDDEN> ("Daniel =?UTF-8?Q?Mart=C3=ADn?= via
 \"Bug reports for
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 Dec 2021 16:44:13 +0100")
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Daniel Mart=C3=ADn via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs@HIDDEN> writes:

> ndame via "Bug reports for GNU Emacs, the Swiss army knife of text
> editors" <bug-gnu-emacs@HIDDEN> writes:
>
>> Other tools has similar features like the mark ring and they
>> provide two-way navigation, so you can go back to some previous
>> position to check something, and then you can go forward in the
>> ring to get back to a more recent position or the latest position
>> if you want.
>>
>> Emacs could have this too by providing a command which allows
>> moving forward in the mark ring.
>
> +1.  I agree that this is a useful feature that would improve the text
> editing capabilities of Emacs.  In Vim, you can use C-i and C-o to
> navigate forwards and backwards, respectively.
>
> A similar thing happens with the kill-ring.  M-y moves the last-yank
> pointer in one direction, but there could be a command to move it in the
> opposite direction.  Even if the mark and kill ring cycle, it is
> inconvenient to browse them in one direction only, because as modern
> computers have more memory available, the rings can store more things.
>
> This is probably one of the reasons why there are a lot of external
> packages that let you browse the contents of the mark-ring and kill-ring
> in the minibuffer or a separate buffer.

Regarding M-y, you can use negative prefixes to move in the opposite
direction.

Regarding the mark ring, I don't think it's possible.  If indeed it's
not, I think it's a good idea to add such functionality.


--=20
Andr=C3=A9 A. Gomes
"Free Thought, Free World"

Message sent to bug-gnu-emacs@HIDDEN:

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On 11.12.2021 00:20, ndame via Bug reports for GNU Emacs, the Swiss army 
knife of text editors wrote:
> Other tools has similar features like the mark ring and they
> provide two-way navigation, so you can go back to some previous
> position to check something, and then you can go forward in the
> ring to get back to a more recent position or the latest position
> if you want.
> 
> Emacs could have this too by providing a command which allows
> moving forward in the mark ring.

FWIW, we've recently added xref-go-forward, bound to 'C-M-,', which 
pairs with xref-go-back (which was renamed at the same time), bound to 
'M-,'.

A fair number of commands both push to mark ring and call 
xref-push-marker-stack, so you might find this useful.

Message sent to bug-gnu-emacs@HIDDEN:

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>> Emacs could have this too by providing a command which allows
>> moving forward in the mark ring.
>
> FWIW, we've recently added xref-go-forward, bound to 'C-M-,', which pairs
> with xref-go-back (which was renamed at the same time), bound to 'M-,'.
>
> A fair number of commands both push to mark ring and call
> xref-push-marker-stack, so you might find this useful.

Another idea: add a command that will display a *xref* buffer
with lines of locations extracted from the global-mark-ring.
This will allow visiting mark locations from the mark list.
Maybe this can be implemented by just adding a new xref backend?

Message sent to bug-gnu-emacs@HIDDEN:

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> Another idea: add a command that will display a *xref* buffer
> with lines of locations extracted from the global-mark-ring.
> This will allow visiting mark locations from the mark list.

FWIW, I added this to Icicles on Dec 16, 2006.

By default, in Icicle mode there are these
multi-commands:

1. `C-SPC is bound' to
`icicle-goto-marker-or-set-mark-command'.

Goes to a marker or sets the mark.
No prefix arg or prefix arg > 0: `set-mark-command'.
Prefix arg < 0: goes to a local marker you choose.
Prefix arg =3D 0: goes to global or local marker.

Completion candidates are text of the marker's
line.

2. `C-x C-SPC' is bound to
`icicle-goto-global-marker-or-pop-global-mark'.

Goes to a global marker or pops the global mark.
Prefix arg < 0: goes to global marker you choose.
Otherwise, this is `pop-global-mark'.

Completion candidates can be multi-completions,
with two parts: (1) marker's buffer name, (2) text
from marker's line.  You can match either or both
parts, to narrow the choices.

By default, candidates are sorted in buffer order
and then marker order (buffer position).  As usual,
you can change the sort order on the fly.
___

A "multi-command" means that you can, with a single
command invocation, act multiple times, e.g. on
different completion candidates.  So you can move
around among marker positions, including cycling
in buffer order (or other orders).

Message sent to bug-gnu-emacs@HIDDEN:

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On 13.12.2021 11:44, Juri Linkov wrote:
> Another idea: add a command that will display a*xref*  buffer
> with lines of locations extracted from the global-mark-ring.
> This will allow visiting mark locations from the mark list.
> Maybe this can be implemented by just adding a new xref backend?
> 

An Xref backend is something used automatically. This one would shadow 
some "real" backends that provide code navigation, for example.

But we could have a command which lists the entries from 
global-mark-ring in an Xref results buffer, allowing navigation across 
them, or jumping to a specific one.

But I guess one problem is xref--show-xrefs also pushes mark to mark 
ring (including the global one). So using the aforementioned command 
would automatically alter its results list.

But maybe it's not too much of a problem.

Message received at control <at> debbugs.gnu.org:

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