GNU logs - #73745, boring messages

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Subject: bug#73745: Add query-replace-reverse functions
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From: Dan Jacobson <jidanni@HIDDEN>
Date: Fri, 11 Oct 2024 19:00:02 +0800
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I am looking at the M-% prompt:
```
Query replace (default <h2 → <h2 class="zzz"): <h2 → <h2 class="zz"
```
and I am wondering how to get it to do the reverse?

It is prompting with my previous action, but now I want to do the exact
opposite,   `<h2 class="zz" → <h`
No, I can't just put my (emacs -nw) cursor on top of the arrow and hit M-t.
https://stackoverflow.com/questions/39700435/emacs-query-replace-regexp-reverse-order-of-default#comment132667451_39705933
because my string is not so simple.

>Just hit the undo button.

I don't want to do an undo, I want to do a reverse query replace of my
previous query replace.

Wait. And then it dawned on me: emacs needs a
reverse-previous-query-replace function.

It would be just like query-replace, but using B -> A instead of A -> B.

And doing ESC p should march through the query replace history, but with
each pair reversed!

And same for query-replace-regexp. There needs to be a
reverse-query-replace-regexp too.

Or maybe call them query-replace-reverse, etc.

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Dan Jacobson <jidanni@HIDDEN>
Subject: bug#73745: Acknowledgement (Add query-replace-reverse functions)
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73745: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D73745
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Subject: bug#73745: Add query-replace-reverse functions
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> From: Dan Jacobson <jidanni@HIDDEN>
> Date: Fri, 11 Oct 2024 19:00:02 +0800
> 
> I am looking at the M-% prompt:
> ```
> Query replace (default <h2 → <h2 class="zzz"): <h2 → <h2 class="zz"
> ```
> and I am wondering how to get it to do the reverse?

Type M-p or <UP> arrow twice.

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Subject: bug#73745: Add query-replace-reverse functions
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> It is prompting with my previous action, but now I want to do the exact
> opposite,   `<h2 class="zz" → <h`
> No, I can't just put my (emacs -nw) cursor on top of the arrow and hit M-t.

Some time ago we discussed 'M-t' to reverse 'from'/'to' parts.
But the problem is that for multi-word replacements
'M-t' should still transpose words inside 'from' or 'to'
separately.

All transpose keys ‘C-t’ (‘transpose-chars’), ‘M-t’
(‘transpose-words’), ‘C-M-t’ (‘transpose-sexps’), even ‘C-x C-t’
(‘transpose-lines’) for multi-line replacements -
all these keys can't be used to reverse 'from'/'to'.

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Juri Linkov <juri@HIDDEN> writes:

>> It is prompting with my previous action, but now I want to do the exact
>> opposite,   `<h2 class=3D"zz" =E2=86=92 <h`
>> No, I can't just put my (emacs -nw) cursor on top of the arrow and hit M=
-t.
>
> Some time ago we discussed 'M-t' to reverse 'from'/'to' parts.
> But the problem is that for multi-word replacements
> 'M-t' should still transpose words inside 'from' or 'to'
> separately.
>
> All transpose keys =E2=80=98C-t=E2=80=99 (=E2=80=98transpose-chars=E2=80=
=99), =E2=80=98M-t=E2=80=99
> (=E2=80=98transpose-words=E2=80=99), =E2=80=98C-M-t=E2=80=99 (=E2=80=98tr=
anspose-sexps=E2=80=99), even =E2=80=98C-x C-t=E2=80=99
> (=E2=80=98transpose-lines=E2=80=99) for multi-line replacements -
> all these keys can't be used to reverse 'from'/'to'.

How about something like `C-c M-t`?

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>>> It is prompting with my previous action, but now I want to do the exact
>>> opposite,   `<h2 class="zz" → <h`
>>> No, I can't just put my (emacs -nw) cursor on top of the arrow and hit M-t.
>>
>> Some time ago we discussed 'M-t' to reverse 'from'/'to' parts.
>> But the problem is that for multi-word replacements
>> 'M-t' should still transpose words inside 'from' or 'to'
>> separately.
>>
>> All transpose keys ‘C-t’ (‘transpose-chars’), ‘M-t’
>> (‘transpose-words’), ‘C-M-t’ (‘transpose-sexps’), even ‘C-x C-t’
>> (‘transpose-lines’) for multi-line replacements -
>> all these keys can't be used to reverse 'from'/'to'.
>
> How about something like `C-c M-t`?

I see no other keys on the `C-c` keymap in the minibuffer:

  No commands with a binding that start with C-c.

OTOH, while reading a regexp for `C-M-%` there is:

  M-s c		read-regexp-toggle-case-fold

So maybe `M-s M-t` is not too bad.
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