GNU bug report logs - #24089
25.1; Dired: diff error on = <RET> if the file has a backup inside .~/

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Jorge Peixoto de Morais Neto <jorge13515 <at> gmail.com>
To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org>
Subject: 25.1; Dired: diff error on = <RET> if the file has a backup inside .~/
Date: Wed, 27 Jul 2016 15:42:26 -0300

[Message part 1 (text/plain, inline)]

Please extract the attached gzipped tarball into ~.

Inside ~, start Emacs with an init file containing the following:
--8<---------------cut here---------------start------------->8---
(custom-set-variables
 ;; custom-set-variables was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.
 '(backup-directory-alist (quote (("." . ".~"))))
)

(custom-set-faces
 ;; custom-set-faces was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.
 )
--8<---------------cut here---------------end--------------->8---

Perform the following steps:
1. C-x d ~/dired-diff-bug-1 <RET>
2. j dummy <RET>
3. = <RET>
I expected (according to the documentation of dired-diff) to see the
diff of dummy with its backup.  Instead a diff error occurs.  I have
saved the diff error buffer to diff-error-dummy.txt and attached it.

Now perform the following steps:
1. C-x d ~/dired-diff-bug-1/.~ <RET>
2. j dummy~ <RET>
3. = <RET>.
A similar diff error occurs. It is also unexpected.  I have saved the
diff error buffer in diff-error-dummy~.txt and attached it.

I have also attached a dribble file.

report-emacs-bug was invoked from another Emacs session, also invoked with an
init file having the contents specified above.


In GNU Emacs 25.1.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.9)
 of 2016-07-25 built on jorge-HP-G42
Windowing system distributor 'The X.Org Foundation', version 11.0.11803000
System Description:	Ubuntu 16.04.1 LTS

Configured using:
 'configure --prefix=/usr/local/emacs/ --with-modules'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES

Important settings:
  value of $LC_MONETARY: en_DK.UTF-8
  value of $LC_NUMERIC: en_DK.UTF-8
  value of $LC_TIME: en_DK.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Fundamental

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[dribble.txt (text/plain, attachment)]

Message #8 received at 24089 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Jorge Peixoto de Morais Neto <jorge13515 <at> gmail.com>
Cc: 24089 <at> debbugs.gnu.org
Subject: Re: bug#24089: 25.1;
 Dired: diff error on = <RET> if the file has a backup inside .~/
Date: Thu, 28 Jul 2016 18:05:12 +0300

> From: Jorge Peixoto de Morais Neto <jorge13515 <at> gmail.com>
> Date: Wed, 27 Jul 2016 15:42:26 -0300
> 
> Please extract the attached gzipped tarball into ~.
> 
> Inside ~, start Emacs with an init file containing the following:
> --8<---------------cut here---------------start------------->8---
> (custom-set-variables
>  ;; custom-set-variables was added by Custom.
>  ;; If you edit it by hand, you could mess it up, so be careful.
>  ;; Your init file should contain only one such instance.
>  ;; If there is more than one, they won't work right.
>  '(backup-directory-alist (quote (("." . ".~"))))
> )
> 
> (custom-set-faces
>  ;; custom-set-faces was added by Custom.
>  ;; If you edit it by hand, you could mess it up, so be careful.
>  ;; Your init file should contain only one such instance.
>  ;; If there is more than one, they won't work right.
>  )
> --8<---------------cut here---------------end--------------->8---
> 
> Perform the following steps:
> 1. C-x d ~/dired-diff-bug-1 <RET>
> 2. j dummy <RET>
> 3. = <RET>
> I expected (according to the documentation of dired-diff) to see the
> diff of dummy with its backup.  Instead a diff error occurs.  I have
> saved the diff error buffer to diff-error-dummy.txt and attached it.
> 
> Now perform the following steps:
> 1. C-x d ~/dired-diff-bug-1/.~ <RET>
> 2. j dummy~ <RET>
> 3. = <RET>.
> A similar diff error occurs. It is also unexpected.  I have saved the
> diff error buffer in diff-error-dummy~.txt and attached it.

Thanks.

It seems dired-diff was not prepared to deal with the situation where
the backup file is in another directory.  Does the patch below produce
good results?

--- lisp/dired-aux.el~0	2016-05-08 07:05:52.000000000 +0300
+++ lisp/dired-aux.el	2016-07-28 18:01:02.437091400 +0300
@@ -78,8 +78,14 @@
 	  (file-at-mark (if (and transient-mark-mode mark-active)
 			    (save-excursion (goto-char (mark t))
 					    (dired-get-filename t t))))
+          (separate-dir (and oldf
+                             (not (equal (file-name-directory oldf)
+                                         (dired-current-directory)))))
 	  (default-file (or file-at-mark
-			    (and oldf (file-name-nondirectory oldf))))
+			    (and oldf
+                                 (if separate-dir
+                                     oldf
+                                   (file-name-nondirectory oldf)))))
 	  ;; Use it as default if it's not the same as the current file,
 	  ;; and the target dir is current or there is a default file.
 	  (default (if (and (not (equal default-file current))
@@ -88,7 +94,9 @@
 				default-file))
 		       default-file))
 	  (target-dir (if default
-			  (dired-current-directory)
+                          (if separate-dir
+                              (file-name-directory default)
+                            (dired-current-directory))
 			(dired-dwim-target-directory)))
 	  (defaults (dired-dwim-target-defaults (list current) target-dir)))
      (list

Message #11 received at 24089 <at> debbugs.gnu.org (full text, mbox):

From: Jorge Peixoto de Morais Neto <jorge13515 <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 24089 <at> debbugs.gnu.org
Subject: Re: bug#24089: 25.1; Dired: diff error on = <RET> if the file has a
 backup inside .~/
Date: Fri, 29 Jul 2016 08:43:30 -0300

On Thu, 2016-07-28 at 18:05 +0300, Eli Zaretskii wrote:
> It seems dired-diff was not prepared to deal with the situation where
> the backup file is in another directory.  Does the patch below produce
> good results?
In my brief testing, the patch solves the problem only when = <RET> is invoked
with point at the original file.  If it is invoked with point at the backup
file (inside .~), a diff error still occurs.

-- 
• I am Brazilian.  I hope my English is correct and I welcome corrections.
• Please adopt free formats like PDF, ODF, Org, LaTeX, Opus, WebM and 7z.
• Free (as in free speech) software for Android: https://f-droid.org/

Message #14 received at 24089 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Jorge Peixoto de Morais Neto <jorge13515 <at> gmail.com>
Cc: 24089 <at> debbugs.gnu.org
Subject: Re: bug#24089: 25.1; Dired: diff error on = <RET> if the file has a
 backup inside .~/
Date: Fri, 29 Jul 2016 17:43:19 +0300

> From: Jorge Peixoto de Morais Neto <jorge13515 <at> gmail.com>
> Cc: 24089 <at> debbugs.gnu.org
> Date: Fri, 29 Jul 2016 08:43:30 -0300
> 
> On Thu, 2016-07-28 at 18:05 +0300, Eli Zaretskii wrote:
> > It seems dired-diff was not prepared to deal with the situation where
> > the backup file is in another directory.  Does the patch below produce
> > good results?
> In my brief testing, the patch solves the problem only when = <RET> is invoked
> with point at the original file.  If it is invoked with point at the backup
> file (inside .~), a diff error still occurs.

I'm not sure why you expect that case to work.  How can Emacs
reverse-engineer backup-directory-alist, to figure out which of its
elements was in effect when the original file was backed up?  In your
example, there's only one element in the alist, but in general there
could be several.

It sounds like in this case the users cannot just press RET, they
should actually type a file name.  Am I missing something?

Message #17 received at 24089 <at> debbugs.gnu.org (full text, mbox):

From: Jorge Peixoto de Morais Neto <jorge13515 <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 24089 <at> debbugs.gnu.org
Subject: Re: bug#24089: 25.1; Dired: diff error on = <RET> if the file has a
 backup inside .~/
Date: Fri, 29 Jul 2016 13:29:23 -0300

On Fri, 2016-07-29 at 17:43 +0300, Eli Zaretskii wrote:
> I'm not sure why you expect that case to work.  How can Emacs
> reverse-engineer backup-directory-alist, to figure out which of its
> elements was in effect when the original file was backed up?  In your
> example, there's only one element in the alist, but in general there
> could be several.
> 
> It sounds like in this case the users cannot just press RET, they
> should actually type a file name.  Am I missing something?
I understood the intended behavior that way because of the dired-diff
docstring:
    If the file at point is a backup file, use its original.

Perhaps the docstring could be clarified?

Also dired-diff could be tweaked so that, when it is is invoked on a backup
file, the default would be empty.  This would avoid the diff error on = <RET>.
 I am not sure though.

Another possibility (which can be combined with the previous) is to tweak
dired-diff to reverse-engineer backup-directory-alist at least for a few
important easy particular cases, such as the following two:
   1. (("." . ".~"))
   2. (("." . "/ABSOLUTE/PATH"))
and possibly others.

-- 
• I am Brazilian.  I hope my English is correct and I welcome corrections.
• Please adopt free formats like PDF, ODF, Org, LaTeX, Opus, WebM and 7z.
• Free (as in free speech) software for Android: https://f-droid.org/

Message #20 received at 24089 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Jorge Peixoto de Morais Neto <jorge13515 <at> gmail.com>
Cc: 24089 <at> debbugs.gnu.org
Subject: Re: bug#24089: 25.1; Dired: diff error on = <RET> if the file has a
 backup inside .~/
Date: Sun, 31 Jul 2016 18:08:40 +0300

> From: Jorge Peixoto de Morais Neto <jorge13515 <at> gmail.com>
> Cc: 24089 <at> debbugs.gnu.org
> Date: Fri, 29 Jul 2016 13:29:23 -0300
> 
> On Fri, 2016-07-29 at 17:43 +0300, Eli Zaretskii wrote:
> > I'm not sure why you expect that case to work.  How can Emacs
> > reverse-engineer backup-directory-alist, to figure out which of its
> > elements was in effect when the original file was backed up?  In your
> > example, there's only one element in the alist, but in general there
> > could be several.
> > 
> > It sounds like in this case the users cannot just press RET, they
> > should actually type a file name.  Am I missing something?
> I understood the intended behavior that way because of the dired-diff
> docstring:
>     If the file at point is a backup file, use its original.
> 
> Perhaps the docstring could be clarified?
> 
> Also dired-diff could be tweaked so that, when it is is invoked on a backup
> file, the default would be empty.  This would avoid the diff error on = <RET>.
>  I am not sure though.
> 
> Another possibility (which can be combined with the previous) is to tweak
> dired-diff to reverse-engineer backup-directory-alist at least for a few
> important easy particular cases, such as the following two:
>    1. (("." . ".~"))
>    2. (("." . "/ABSOLUTE/PATH"))
> and possibly others.

How about the alternative patch below?  It fixes the doc string, and
makes the prompt be without the default in the second case.  Is that
good enough, in your opinion?


--- lisp/dired-aux.el~0	2016-05-08 07:05:52.000000000 +0300
+++ lisp/dired-aux.el	2016-07-31 17:50:35.792144200 +0300
@@ -55,19 +55,23 @@
 
 ;;;###autoload
 (defun dired-diff (file &optional switches)
-  "Compare file at point with file FILE using `diff'.
-If called interactively, prompt for FILE.  If the file at point
-has a backup file, use that as the default.  If the file at point
-is a backup file, use its original.  If the mark is active
-in Transient Mark mode, use the file at the mark as the default.
-\(That's the mark set by \\[set-mark-command], not by Dired's
-\\[dired-mark] command.)
+  "Compare file at point with FILE using `diff'.
+If called interactively, prompt for FILE.
+If the mark is active in Transient Mark mode, use the file at the mark
+as the default for FILE.  (That's the mark set by \\[set-mark-command],
+not by Dired's \\[dired-mark] command.)
+If the file at point has a backup file, use that as the default FILE.
+If the file at point is a backup file, use its original, if that exists
+and can be found.  Note that customizations of `backup-directory-alist'
+and `make-backup-file-name-function' change where this function searches
+for the backup file, and affect its ability to find the original of a
+backup file.
 
-FILE is the first file given to `diff'.  The file at point
-is the second file given to `diff'.
+FILE is the first argument given to the `diff' function.  The file at
+point is the second argument given to `diff'.
 
 With prefix arg, prompt for second argument SWITCHES, which is
-the string of command switches for the third argument of `diff'."
+the string of command switches used as the third argument of `diff'."
   (interactive
    (let* ((current (dired-get-filename t))
 	  ;; Get the latest existing backup file or its original.
@@ -78,8 +82,20 @@
 	  (file-at-mark (if (and transient-mark-mode mark-active)
 			    (save-excursion (goto-char (mark t))
 					    (dired-get-filename t t))))
+          (separate-dir (and oldf
+                             (not (equal (file-name-directory oldf)
+                                         (dired-current-directory)))))
 	  (default-file (or file-at-mark
-			    (and oldf (file-name-nondirectory oldf))))
+                            ;; If the file with which to compare
+                            ;; doesn't exist, or we cannot intuit it,
+                            ;; we forget that name and don't show it
+                            ;; as the default, as an indication to the
+                            ;; user that she should type the file
+                            ;; name.
+			    (and (if (and oldf (file-readable-p oldf)) oldf)
+                                 (if separate-dir
+                                     oldf
+                                   (file-name-nondirectory oldf)))))
 	  ;; Use it as default if it's not the same as the current file,
 	  ;; and the target dir is current or there is a default file.
 	  (default (if (and (not (equal default-file current))
@@ -88,7 +104,9 @@
 				default-file))
 		       default-file))
 	  (target-dir (if default
-			  (dired-current-directory)
+                          (if separate-dir
+                              (file-name-directory default)
+                            (dired-current-directory))
 			(dired-dwim-target-directory)))
 	  (defaults (dired-dwim-target-defaults (list current) target-dir)))
      (list

Message #23 received at 24089 <at> debbugs.gnu.org (full text, mbox):

From: Jorge Peixoto de Morais Neto <jorge13515 <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 24089 <at> debbugs.gnu.org
Subject: Re: bug#24089: 25.1; Dired: diff error on = <RET> if the file has a
 backup inside .~/
Date: Tue, 02 Aug 2016 23:04:24 -0300

On Sun, 2016-07-31 at 18:08 +0300, Eli Zaretskii wrote:
> How about the alternative patch below?  It fixes the doc string, and
> makes the prompt be without the default in the second case.  Is that
> good enough, in your opinion?

This new patch is better.  This is already good.  There is one more tweak that
maybe could make it even better: with this latest patch, if the user types =
<RET> in the backup file then Emacs says
   Attempt to compare the file to itself

Wouldn't it be better if dired-diff refused the minibuffer input if it is not
a valid file?  This way, if the user types = <RET>, Emacs will display "[no
match]", which would be more precise.

Regards

-- 
• I am Brazilian.  I hope my English is correct and I welcome corrections.
• Please adopt free formats like PDF, ODF, Org, LaTeX, Opus, WebM and 7z.
• Free (as in free speech) software for Android: https://f-droid.org/

Message #28 received at 24089-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Jorge Peixoto de Morais Neto <jorge13515 <at> gmail.com>
Cc: 24089-done <at> debbugs.gnu.org
Subject: Re: bug#24089: 25.1; Dired: diff error on = <RET> if the file has a
 backup inside .~/
Date: Sat, 06 Aug 2016 13:18:50 +0300

> From: Jorge Peixoto de Morais Neto <jorge13515 <at> gmail.com>
> Cc: 24089 <at> debbugs.gnu.org
> Date: Tue, 02 Aug 2016 23:04:24 -0300
> 
> On Sun, 2016-07-31 at 18:08 +0300, Eli Zaretskii wrote:
> > How about the alternative patch below?  It fixes the doc string, and
> > makes the prompt be without the default in the second case.  Is that
> > good enough, in your opinion?
> 
> This new patch is better.  This is already good.  There is one more tweak that
> maybe could make it even better: with this latest patch, if the user types =
> <RET> in the backup file then Emacs says
>    Attempt to compare the file to itself

The same happens in other situations when there's no default
dired-diff can intuit.  So this behavior is not new to dired-diff.

> Wouldn't it be better if dired-diff refused the minibuffer input if it is not
> a valid file?  This way, if the user types = <RET>, Emacs will display "[no
> match]", which would be more precise.

No, I think the "[No match]" thing is worse: it leaves the user
wondering what it means.  (Match for what?)  I believe the fact that
there's no default value is a hint good enough for the user to become
aware that she must type something.

I committed the patch to the master branch, and I'm marking this bug
done.  Thanks a lot for reporting this subtle bug and for testing the
fixes.

Message #31 received at 24089-done <at> debbugs.gnu.org (full text, mbox):

From: Jorge Peixoto de Morais Neto <jorge13515 <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 24089-done <at> debbugs.gnu.org
Subject: Re: bug#24089: 25.1; Dired: diff error on = <RET> if the file has a
 backup inside .~/
Date: Sat, 06 Aug 2016 12:50:34 -0300

On Sat, 2016-08-06 at 13:18 +0300, Eli Zaretskii wrote:
> I committed the patch to the master branch, and I'm marking this bug
> done.  Thanks a lot for reporting this subtle bug and for testing the
> fixes.

Thank you very much for improving Emacs!
-- 
• I am Brazilian.  I hope my English is correct and I welcome corrections.
• Please adopt free formats like PDF, ODF, Org, LaTeX, Opus, WebM and 7z.
• Free (as in free speech) software for Android: https://f-droid.org/

Message #44 received at 24089 <at> debbugs.gnu.org (full text, mbox):

From: Jorge Morais Neto <jorge13515 <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 24089 <at> debbugs.gnu.org
Subject: Re: bug#24089: 25.1; Dired: diff error on = <RET> if the file has a
 backup inside .~/
Date: Tue, 15 Nov 2016 14:14:47 -0200

On 6 August 2016 at 07:18, Eli Zaretskii <eliz <at> gnu.org> wrote:
> I committed the patch to the master branch, and I'm marking this bug
> done.  Thanks a lot for reporting this subtle bug and for testing the
> fixes.

I found a problem with the solution to this bug.  The solution could be further
improved.

My Emacs init file is "~/.emacs.d/init.el".  It has numbered backups in
"~/.emacs.d/.~/".  It is true that with the existing fix, I can invoke
dired-diff on init.el and immediately hit RET, and it will work as expected.
However, I often want to compare with an earlier backup.Therefore, I want to be
able to:
1. Pull into the minibuffer (with M-n) the path to the latest backup, so I could
   edit it to become the path of an earlier backup.  Or even better,
2. Pull into the minibuffer (with M-n) the path to the latest backup, and get
   the path of earlier and earlier backups with successive invocations of M-n.

The current fix lacks both of these features.

Regards

-- 
• I am Brazilian.  I hope my English is correct and I welcome corrections.
• Please adopt free formats like PDF, ODF, Org, LaTeX, Opus, WebM and 7z.
• Free (as in free speech) software for Android: https://f-droid.org/

Message #53 received at 24089 <at> debbugs.gnu.org (full text, mbox):

From: Jorge Morais Neto <jorge13515 <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 24089 <at> debbugs.gnu.org
Subject: Re: bug#24089: 25.1; Dired: diff error on = <RET> if the file has a
 backup inside .~/
Date: Sun, 5 Mar 2017 19:29:38 -0300

On 15 November 2016 at 14:14, Jorge Morais Neto <jorge13515 <at> gmail.com> wrote:
> I found a problem with the solution to this bug.  The solution could be further
> improved.

Hi.  Will this be worked on?

I am sorry for insisting, but I thought the last email could have been
lost.  I do not intend to insist further.

Message #56 received at 24089 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Jorge Morais Neto <jorge13515 <at> gmail.com>
Cc: 24089 <at> debbugs.gnu.org
Subject: Re: bug#24089: 25.1; Dired: diff error on = <RET> if the file has a
 backup inside .~/
Date: Mon, 06 Mar 2017 05:33:49 +0200

> From: Jorge Morais Neto <jorge13515 <at> gmail.com>
> Date: Sun, 5 Mar 2017 19:29:38 -0300
> Cc: 24089 <at> debbugs.gnu.org
> 
> On 15 November 2016 at 14:14, Jorge Morais Neto <jorge13515 <at> gmail.com> wrote:
> > I found a problem with the solution to this bug.  The solution could be further
> > improved.
> 
> Hi.  Will this be worked on?

I don't know how to solve the issues you raise with this particular
arrangement of backup files.  Maybe someone else does.  Sorry.

> I am sorry for insisting, but I thought the last email could have been
> lost.

It didn't get lost, I just had nothing useful to say in response.

Thanks.

Message #63 received at 24089 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Jorge Morais Neto <jorge13515 <at> gmail.com>
Cc: 24089 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#24089: 25.1; Dired: diff error on = <RET> if the file has a
 backup inside .~/
Date: Mon, 24 Aug 2020 19:17:37 +0200

Jorge Morais Neto <jorge13515 <at> gmail.com> writes:

> I found a problem with the solution to this bug.  The solution could be further
> improved.
>
> My Emacs init file is "~/.emacs.d/init.el".  It has numbered backups in
> "~/.emacs.d/.~/".  It is true that with the existing fix, I can invoke
> dired-diff on init.el and immediately hit RET, and it will work as expected.
> However, I often want to compare with an earlier backup.Therefore, I want to be
> able to:
> 1. Pull into the minibuffer (with M-n) the path to the latest backup, so I could
>    edit it to become the path of an earlier backup.  Or even better,
> 2. Pull into the minibuffer (with M-n) the path to the latest backup, and get
>    the path of earlier and earlier backups with successive invocations of M-n.
>
> The current fix lacks both of these features.

That makes sense to me, and is something that sounds quite useful.  I
grepped around Emacs, but I could find any function that just returned
the list of backup files conveniently, so I added one --
'file-backup-file-names'.  (Everybody -- feel free to change the name if
that's too awkward.)  I wrote it by ripping everything out of
'file-newest-backup', basically.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #70 received at 24089 <at> debbugs.gnu.org (full text, mbox):

From: Drew Adams <drew.adams <at> oracle.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>, Jorge Morais Neto
 <jorge13515 <at> gmail.com>
Cc: 24089 <at> debbugs.gnu.org
Subject: RE: bug#24089: 25.1; Dired: diff error on = <RET> if the file has a
 backup inside .~/
Date: Mon, 24 Aug 2020 10:31:32 -0700 (PDT)

> 'file-backup-file-names'.  (Everybody -- feel free to change the name if
> that's too awkward.)

Maybe just `file-backup-files' or even just `backup-files'.

I think generally for a list of file names we just
say "files", not "file-names".  E.g. `directory-files*',
`tags-table-files'.  (Or we say `file-list'.) 

(There are of course other functions with "files" in the
name, which _act_ on files, and don't involve a list of
file names.)

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