GNU bug report logs - #78596
30.1; recentf-open ought to use a completion table and category

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

From: dino chiesa <dpchiesa <at> hotmail.com>
To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org>
Subject: 30.1; recentf-open ought to use a completion table and category
Date: Mon, 26 May 2025 19:57:39 +0000

This isn't a bug report, more of an enhancement request.

Summary
I would like recentf-open to use "Programmed Completion" via 
a completion function. (see 21.6.7 Programmed Completion)  
That function ought to return metadata with a category that 
is specific to recentf.

Background
I've been configuring icomplete-vertical-mode for various things.  I
learned that by default, when there is no completion table, completion
in the minibuffer uses `completion-all-sorted-completions' which is
defined in minibuffer.el; by default it uses a function called
`minibuffer--sort-by-length-alpha', which sorts candidates first by
length, then alphabetically. The result is an aesthetically pleasing
pyramid of choices shown vertically in the minibuffer, but it is sort of 
non-intuitive for things like "open one of the files I've recently visited".

This default sorting applies to buffer names, filenames (find-file),
command names (M-x), and various other things. 

I learned also that it is possible to override that default sorting, via 
`completion-category-overrides`.  To make this work, I must add an
item to that list with a symbol denoting a category, and then make
sure the use of completing-read uses (a) a completion _function_, not 
just a list of candidates; and (b) that category name in the metadata
returned by the completion function.

But not all uses of `completing-read' employ a completion
function. Without that, I think overriding the sort is unwieldy. recentf-open 
is one of those cases that does not currently use a completion function.

So I propose to modify recentf-open to use a completion function:

< (defun recentf-open (file)
<   "Prompt for FILE in `recentf-list' and visit it.
< Enable `recentf-mode' if it isn't already."
<   (interactive
<    (list
<     (progn (unless recentf-mode (recentf-mode 1))
<            (completing-read (format-prompt "Open recent file" nil)
<                             (recentf--programmed-completion recentf-list)
<                             nil t))))
---
> (defun recentf-open (file)
>   "Prompt for FILE in `recentf-list' and visit it.
> Enable `recentf-mode' if it isn't already."
>   (interactive
>    (list
>     (progn (unless recentf-mode (recentf-mode 1))
>            (completing-read (format-prompt "Open recent file" nil)
>                             recentf-list nil t))))
>

And the completion function, I think, can be like this.

  (defun recentf--programmed-completion (candidates)
    "Returns a function to be used as the completions parameter in
`completing-read' for `recentf-open'. Main purpose is to set metadata,
specifically the category, which will allow sorting, completion styles, etc."
    (let ((candidates candidates))
      (lambda (string pred action)
        (if (eq action 'metadata)
            `(metadata (category . recentf))
          (complete-with-action action candidates string pred)))))

If that is done, then users of `recentf-open` who also use `icomplete-vertical-mode`
can do something as simple as the following to disable the default "by length then
by alpha" sorting for recentf-open:

   (add-to-list 'completion-category-overrides
                 `(recentf
                   (styles . (substring))
                   (cycle-sort-function . ,#'identity)))

I believe this should have no impact on existing users of `recentf-open'. 

====================================================================

In GNU Emacs 30.1 (build 2, x86_64-w64-mingw32) of 2025-02-23 built on
 AVALON
Windowing system distributor 'Microsoft Corp.', version 10.0.26100
System Description: Microsoft Windows 10 Home (v10.0.2009.26100.4061)

Configured using:
 'configure --with-modules --without-dbus --with-native-compilation=aot
 --without-compress-install --with-tree-sitter CFLAGS=-O2
 prefix=/g/rel/install/emacs-30.1'

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY W32NOTIFY PDUMPER PNG RSVG SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XPM ZLIB

(NATIVE_COMP present but libgccjit not available)

Important settings:
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Major mode: ELisp/l

Minor modes in effect:
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  icomplete-vertical-mode: t
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Features:
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apheleia-rcs apheleia-dp apheleia-formatters apheleia-utils apheleia-log
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magit-stash magit-reflog magit-bisect magit-push magit-pull magit-fetch
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magit-mode transient benchmark magit-git magit-base magit-section
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ob-tangle ol org-src ob-ref ob-lob ob-table ob-exp ob-comint ob-core
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external-completion jsonrpc xref flymake thingatpt project diff
diff-mode track-changes ert pp ewoc debug backtrace filenotify warnings
compile text-property-search comint ansi-osc ring imenu flycheck
ansi-color find-func marginalia compat icomplete edmacro kmacro
use-package-bind-key bind-key hl-line finder-inf dino-utility memoize
dash dpc-sys-windows-nt s cl-extra help-mode use-package-ensure
use-package-core aidermacs-autoloads apheleia-autoloads easy-mmode
async-autoloads caddyfile-mode-autoloads chatgpt-shell-autoloads
command-log-mode-autoloads company-box-autoloads company-autoloads
default-text-scale-autoloads eglot-autoloads eglot-booster-autoloads
electric-operator-autoloads expand-region-autoloads f-autoloads
faceup-autoloads flycheck-autoloads flymake-autoloads
frame-local-autoloads gnu-elpa-keyring-update-autoloads
go-mode-autoloads google-gemini-autoloads gptel-autoloads ht-autoloads
idlwave-autoloads indent-bars-autoloads json-mode-autoloads
json-snatcher-autoloads jsonnet-mode-autoloads logito-autoloads
loop-autoloads lv-autoloads magit-autoloads pcase
magit-section-autoloads llama-autoloads marginalia-autoloads
markdown-mode-autoloads memoize-autoloads msgu-autoloads
multiple-cursors-autoloads org-autoloads path-helper-autoloads
popup-autoloads powershell-autoloads protobuf-mode-autoloads
rego-mode-autoloads reformatter-autoloads request-autoloads
rfc-mode-autoloads rg-autoloads s-autoloads shell-maker-autoloads
spinner-autoloads sr-speedbar-autoloads tblui-autoloads
tablist-autoloads magit-popup-autoloads track-changes-autoloads
tramp-autoloads rx transient-autoloads typescript-mode-autoloads
verilog-mode-autoloads wgrep-autoloads with-editor-autoloads
wsd-mode-autoloads x509-mode-autoloads yaml-mode-autoloads
yasnippet-autoloads yaxception-autoloads info dash-autoloads package
browse-url url url-proxy url-privacy url-expand url-methods url-history
url-cookie generate-lisp-file url-domsuf url-util mailcap url-handlers
url-parse auth-source cl-seq eieio eieio-core cl-macs icons
password-cache json subr-x map byte-opt gv bytecomp byte-compile
url-vars cl-loaddefs cl-lib rmc iso-transl tooltip cconv eldoc paren
electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel
touch-screen dos-w32 ls-lisp disp-table term/w32-win w32-win w32-vars
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page tab-bar menu-bar rfn-eshadow isearch easymenu timer select
scroll-bar mouse jit-lock font-lock syntax font-core term/tty-colors
frame minibuffer nadvice seq simple cl-generic indonesian philippine
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
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charprop case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure
cl-preloaded button loaddefs theme-loaddefs faces cus-face macroexp
files window text-properties overlay sha1 md5 base64 format env
code-pages mule custom widget keymap hashtable-print-readable backquote
threads w32notify w32 lcms2 multi-tty move-toolbar make-network-process
native-compile emacs)

Memory information:
((conses 16 672435 122634) (symbols 48 39095 1) (strings 32 196605 7313)
 (string-bytes 1 5493821) (vectors 16 73230) (vector-slots 8 1545967 128424)
 (floats 8 462 15256) (intervals 56 9860 577) (buffers 992 21))

Message #8 received at 78596 <at> debbugs.gnu.org (full text, mbox):

From: Eshel Yaron <me <at> eshelyaron.com>
To: dino chiesa <dpchiesa <at> hotmail.com>
Cc: 78596 <at> debbugs.gnu.org
Subject: Re: bug#78596: 30.1; recentf-open ought to use a completion table
 and category
Date: Tue, 27 May 2025 16:08:52 +0200

Hi,

dino chiesa <dpchiesa <at> hotmail.com> writes:

> This isn't a bug report, more of an enhancement request.
>
> Summary
> I would like recentf-open to use "Programmed Completion" via 
> a completion function. (see 21.6.7 Programmed Completion)  
> That function ought to return metadata with a category that 
> is specific to recentf.

Good idea.  Could you please check if the following patch works for you?

diff --git a/lisp/recentf.el b/lisp/recentf.el
index a773ea9ec01..006b3159bb9 100644
--- a/lisp/recentf.el
+++ b/lisp/recentf.el
@@ -505,7 +505,9 @@ recentf-open
    (list
     (progn (unless recentf-mode (recentf-mode 1))
            (completing-read (format-prompt "Open recent file" nil)
-                            recentf-list nil t))))
+                            (completion-table-with-metadata
+                             recentf-list '((category . recentf)))
+                            nil t))))
   (when file
     (funcall recentf-menu-action file)))
 


The completion-table-with-metadata function is a new helper function
that is very useful when we just want to enrich some existing completion
table with some metadata.  

We should probably document it in the manual, BTW.  Here's a draft:

diff --git a/doc/lispref/minibuf.texi b/doc/lispref/minibuf.texi
index 3cc206d2e1d..2e91f2c21b4 100644
--- a/doc/lispref/minibuf.texi
+++ b/doc/lispref/minibuf.texi
@@ -2123,6 +2123,15 @@ Programmed Completion
 when a slow operation is involved, such as calling an external process.
 @end defun
 
+@defun completion-table-with-metadata table metadata
+This function creates a completion table that behaves like the existing
+completion table @var{table}, except with additional metadata given in
+@var{metadata}, which is an alist of completion metadata.  If
+@var{table} already provides completion metadata, it is merged with
+@var{metadata}, giving precedence to @var{metadata} if an entry appears
+both in @var{metadata} and in the metadata that @var{table} produces.
+@end defun
+
 @node Completion in Buffers
 @subsection Completion in Ordinary Buffers
 @cindex inline completion



Best,

Eshel

Message #11 received at 78596 <at> debbugs.gnu.org (full text, mbox):

From: dino chiesa <dpchiesa <at> hotmail.com>
To: "78596 <at> debbugs.gnu.org" <78596 <at> debbugs.gnu.org>
Subject: Re: bug#78596: 30.1; recentf-open ought to use a completion table
Date: Sun, 1 Jun 2025 00:32:26 +0000

Thank you, 
that will work nicely. 

Message #14 received at 78596 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Eshel Yaron <me <at> eshelyaron.com>, dino chiesa <dpchiesa <at> hotmail.com>
Cc: 78596 <at> debbugs.gnu.org
Subject: Re: bug#78596: 30.1; recentf-open ought to use a completion table
Date: Sat, 07 Jun 2025 11:44:03 +0300

> From: dino chiesa <dpchiesa <at> hotmail.com>
> Date: Sun, 1 Jun 2025 00:32:26 +0000
> msip_labels: 
> 
> Thank you, 
> that will work nicely. 

Thanks.

Eshel, would you please therefore install your changes?

Message #17 received at 78596 <at> debbugs.gnu.org (full text, mbox):

From: Eshel Yaron <me <at> eshelyaron.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 78596 <at> debbugs.gnu.org, dino chiesa <dpchiesa <at> hotmail.com>
Subject: Re: bug#78596: 30.1; recentf-open ought to use a completion table
Date: Sat, 07 Jun 2025 22:14:05 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: dino chiesa <dpchiesa <at> hotmail.com>
>> Date: Sun, 1 Jun 2025 00:32:26 +0000
>> msip_labels: 
>> 
>> Thank you, 
>> that will work nicely. 
>
> Thanks.
>
> Eshel, would you please therefore install your changes?

Sure, I've now pushed the change to recentf-open in commit b7560fb63dc.
Should I also push the part that documents
completion-table-with-metadata in the ELisp manual?


Eshel

Message #20 received at 78596 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Eshel Yaron <me <at> eshelyaron.com>
Cc: 78596 <at> debbugs.gnu.org, dpchiesa <at> hotmail.com
Subject: Re: bug#78596: 30.1; recentf-open ought to use a completion table
Date: Sun, 08 Jun 2025 07:35:20 +0300

> From: Eshel Yaron <me <at> eshelyaron.com>
> Cc: dino chiesa <dpchiesa <at> hotmail.com>,  78596 <at> debbugs.gnu.org
> Date: Sat, 07 Jun 2025 22:14:05 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> From: dino chiesa <dpchiesa <at> hotmail.com>
> >> Date: Sun, 1 Jun 2025 00:32:26 +0000
> >> msip_labels: 
> >> 
> >> Thank you, 
> >> that will work nicely. 
> >
> > Thanks.
> >
> > Eshel, would you please therefore install your changes?
> 
> Sure, I've now pushed the change to recentf-open in commit b7560fb63dc.
> Should I also push the part that documents
> completion-table-with-metadata in the ELisp manual?

Yes.  If what you say there is correct for Emacs 30 as well, please
install that part on the release branch.

Thanks.

Message #23 received at 78596 <at> debbugs.gnu.org (full text, mbox):

From: Eshel Yaron <me <at> eshelyaron.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 78596 <at> debbugs.gnu.org, dpchiesa <at> hotmail.com
Subject: Re: bug#78596: 30.1; recentf-open ought to use a completion table
Date: Sun, 08 Jun 2025 21:12:00 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Eshel Yaron <me <at> eshelyaron.com>
>> Cc: dino chiesa <dpchiesa <at> hotmail.com>,  78596 <at> debbugs.gnu.org
>> Date: Sat, 07 Jun 2025 22:14:05 +0200
>> 
>> Eli Zaretskii <eliz <at> gnu.org> writes:
>> 
>> >> From: dino chiesa <dpchiesa <at> hotmail.com>
>> >> Date: Sun, 1 Jun 2025 00:32:26 +0000
>> >> msip_labels: 
>> >> 
>> >> Thank you, 
>> >> that will work nicely. 
>> >
>> > Thanks.
>> >
>> > Eshel, would you please therefore install your changes?
>> 
>> Sure, I've now pushed the change to recentf-open in commit b7560fb63dc.
>> Should I also push the part that documents
>> completion-table-with-metadata in the ELisp manual?
>
> Yes.  If what you say there is correct for Emacs 30 as well, please
> install that part on the release branch.

AFAICT completion-table-with-metadata was only added on master,
so I pushed it to master in commit 4be63c85d2a.


Regards,

Eshel

Message #26 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Daniel Mendler <mail <at> daniel-mendler.de>
To: Eshel Yaron via "Bug reports for GNU Emacs, the Swiss army knife of text
 editors" <bug-gnu-emacs <at> gnu.org>
Cc: 78596 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>,
 Eshel Yaron <me <at> eshelyaron.com>, dpchiesa <at> hotmail.com
Subject: Re: bug#78596: 30.1; recentf-open ought to use a completion table
Date: Sun, 08 Jun 2025 21:28:34 +0200

Eshel Yaron via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs <at> gnu.org> writes:

> Eli Zaretskii <eliz <at> gnu.org> writes:
>
>>> From: Eshel Yaron <me <at> eshelyaron.com>
>>> Cc: dino chiesa <dpchiesa <at> hotmail.com>,  78596 <at> debbugs.gnu.org
>>> Date: Sat, 07 Jun 2025 22:14:05 +0200
>>> 
>>> Eli Zaretskii <eliz <at> gnu.org> writes:
>>> 
>>> >> From: dino chiesa <dpchiesa <at> hotmail.com>
>>> >> Date: Sun, 1 Jun 2025 00:32:26 +0000
>>> >> msip_labels: 
>>> >> 
>>> >> Thank you, 
>>> >> that will work nicely. 
>>> >
>>> > Thanks.
>>> >
>>> > Eshel, would you please therefore install your changes?
>>> 
>>> Sure, I've now pushed the change to recentf-open in commit b7560fb63dc.
>>> Should I also push the part that documents
>>> completion-table-with-metadata in the ELisp manual?
>>
>> Yes.  If what you say there is correct for Emacs 30 as well, please
>> install that part on the release branch.
>
> AFAICT completion-table-with-metadata was only added on master,
> so I pushed it to master in commit 4be63c85d2a.

`completion-table-with-metadata' does not merge the metadata. The
function only adds metadata to a table without metadata, like a list of
strings.

> Regards,
>
> Eshel

Message #32 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Eshel Yaron <me <at> eshelyaron.com>
To: Daniel Mendler <mail <at> daniel-mendler.de>
Cc: "Eshel Yaron via Bug reports for GNU Emacs, the Swiss army knife of text
 editors" <bug-gnu-emacs <at> gnu.org>, 78596 <at> debbugs.gnu.org,
 Eli Zaretskii <eliz <at> gnu.org>, dpchiesa <at> hotmail.com
Subject: Re: bug#78596: 30.1; recentf-open ought to use a completion table
Date: Sun, 08 Jun 2025 22:04:37 +0200

Hi Daniel,

Daniel Mendler <mail <at> daniel-mendler.de> writes:

> Eshel Yaron via "Bug reports for GNU Emacs, the Swiss army knife of text
> editors" <bug-gnu-emacs <at> gnu.org> writes:
>
>> Eli Zaretskii <eliz <at> gnu.org> writes:
>>
>>>> From: Eshel Yaron <me <at> eshelyaron.com>
>>>> Cc: dino chiesa <dpchiesa <at> hotmail.com>,  78596 <at> debbugs.gnu.org
>>>> Date: Sat, 07 Jun 2025 22:14:05 +0200
>>>> 
>>>> Eli Zaretskii <eliz <at> gnu.org> writes:
>>>> 
>>>> >> From: dino chiesa <dpchiesa <at> hotmail.com>
>>>> >> Date: Sun, 1 Jun 2025 00:32:26 +0000
>>>> >> msip_labels: 
>>>> >> 
>>>> >> Thank you, 
>>>> >> that will work nicely. 
>>>> >
>>>> > Thanks.
>>>> >
>>>> > Eshel, would you please therefore install your changes?
>>>> 
>>>> Sure, I've now pushed the change to recentf-open in commit b7560fb63dc.
>>>> Should I also push the part that documents
>>>> completion-table-with-metadata in the ELisp manual?
>>>
>>> Yes.  If what you say there is correct for Emacs 30 as well, please
>>> install that part on the release branch.
>>
>> AFAICT completion-table-with-metadata was only added on master,
>> so I pushed it to master in commit 4be63c85d2a.
>
> `completion-table-with-metadata' does not merge the metadata. The
> function only adds metadata to a table without metadata, like a list of
> strings.

Oh my, right, I had another version of that function in mind.
I've pushed a fix in 86eb733aef4, does that seem accurate?


Thanks,

Eshel

Message #38 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Daniel Mendler <mail <at> daniel-mendler.de>
To: Eshel Yaron via "Bug reports for GNU Emacs, the Swiss army knife of text
 editors" <bug-gnu-emacs <at> gnu.org>
Cc: 78596 <at> debbugs.gnu.org, eliz <at> gnu.org, Eshel Yaron <me <at> eshelyaron.com>,
 dpchiesa <at> hotmail.com
Subject: Re: bug#78596: 30.1; recentf-open ought to use a completion table
Date: Sun, 08 Jun 2025 22:13:09 +0200

Eshel Yaron via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs <at> gnu.org> writes:

> Hi Daniel,
>
> Daniel Mendler <mail <at> daniel-mendler.de> writes:
>
>> Eshel Yaron via "Bug reports for GNU Emacs, the Swiss army knife of text
>> editors" <bug-gnu-emacs <at> gnu.org> writes:
>>
>>> Eli Zaretskii <eliz <at> gnu.org> writes:
>>>
>>>>> From: Eshel Yaron <me <at> eshelyaron.com>
>>>>> Cc: dino chiesa <dpchiesa <at> hotmail.com>,  78596 <at> debbugs.gnu.org
>>>>> Date: Sat, 07 Jun 2025 22:14:05 +0200
>>>>> 
>>>>> Eli Zaretskii <eliz <at> gnu.org> writes:
>>>>> 
>>>>> >> From: dino chiesa <dpchiesa <at> hotmail.com>
>>>>> >> Date: Sun, 1 Jun 2025 00:32:26 +0000
>>>>> >> msip_labels: 
>>>>> >> 
>>>>> >> Thank you, 
>>>>> >> that will work nicely. 
>>>>> >
>>>>> > Thanks.
>>>>> >
>>>>> > Eshel, would you please therefore install your changes?
>>>>> 
>>>>> Sure, I've now pushed the change to recentf-open in commit b7560fb63dc.
>>>>> Should I also push the part that documents
>>>>> completion-table-with-metadata in the ELisp manual?
>>>>
>>>> Yes.  If what you say there is correct for Emacs 30 as well, please
>>>> install that part on the release branch.
>>>
>>> AFAICT completion-table-with-metadata was only added on master,
>>> so I pushed it to master in commit 4be63c85d2a.
>>
>> `completion-table-with-metadata' does not merge the metadata. The
>> function only adds metadata to a table without metadata, like a list of
>> strings.
>
> Oh my, right, I had another version of that function in mind.
> I've pushed a fix in 86eb733aef4, does that seem accurate?

Yes, thanks.

> Thanks,
>
> Eshel

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