GNU bug report logs - #66394
29.1; Make register-read-with-preview more useful

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Package: emacs;

Reported by: Thierry Volpiatto <thievol <at> posteo.net>

Date: Sat, 7 Oct 2023 19:07:01 UTC

Severity: normal

Found in version 29.1

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

Bug is archived. No further changes may be made.

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Thierry Volpiatto <thievol <at> posteo.net>
Subject: bug#66394: closed (Re: bug#66394: 29.1; Make register-read-with-preview
 more useful)
Date: Sat, 23 Dec 2023 10:50:02 +0000
[Message part 1 (text/plain, inline)]
Your bug report

#66394: 29.1; Make register-read-with-preview more useful

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 66394 <at> debbugs.gnu.org.

-- 
66394: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=66394
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems
[Message part 2 (message/rfc822, inline)]
From: Eli Zaretskii <eliz <at> gnu.org>
To: Thierry Volpiatto <thievol <at> posteo.net>
Cc: michael_heerdegen <at> web.de, dmitry <at> gutov.dev, 66394-done <at> debbugs.gnu.org,
 monnier <at> iro.umontreal.ca, stefankangas <at> gmail.com
Subject: Re: bug#66394: 29.1; Make register-read-with-preview more useful
Date: Sat, 23 Dec 2023 12:49:16 +0200
> From: Thierry Volpiatto <thievol <at> posteo.net>
> Cc: monnier <at> iro.umontreal.ca,  stefankangas <at> gmail.com,  dmitry <at> gutov.dev,
>   michael_heerdegen <at> web.de,  66394 <at> debbugs.gnu.org
> Date: Thu, 21 Dec 2023 18:04:02 +0000
> 
> > Thanks, I have a question:
> >
> > The doc string of register-use-preview says:
> >
> >   This has no effect when the value of `register--read-with-preview-function'
> >   is `register-read-with-preview-traditional'.
> >
> > However, customizing register-use-preview to the value 'traditional
> > has the exact effect of setting register--read-with-preview-function
> > to register-read-with-preview-traditional.  OTOH, when
> > register-use-preview is set to 'traditional, one can set it to a
> > different value, and then the behavior will change.  So I wonder what
> > that sentence is about and what I missed?  Is that perhaps a leftover
> > from previous versions, and should now be deleted?
> 
> Yes exactly, it can be deleted.
> 
> > I updated the documentation and NEWS.  I'd appreciate if you could
> > spare a few minutes to review the changes and point out any
> > inaccuracies or mistakes.
> 
> About the documentation or register-use-preview in the manual:
> 
> Another difference with the old behavior (traditional) is that the
> preview is filtered according to type of registers used by command.  For
> example insert-register show only the registers that can be inserted,
> not windows, markers etc... Same for jump.
> 
>     -  "Returns a function to format a register for previewing.
>     -This according to the value of READ-PREVIEW-FUNCTION.")
>     +  "Return a function to format a register for previewing.
>     +This is according to the value of `read-preview-function'.")
> 
> Here READ-PREVIEW-FUNCTION is the argument of function and not a
> variable, so IMO it should be upcased and not quoted.
> 
>      (cl-defstruct register-preview-info
>        "Store data for a specific register command.
>     -TYPES are the types of register supported.
>     -MSG is the minibuffer message to send when a register is selected.
>     +TYPES are the supported types of registers.
>     +MSG is the minibuffer message to show when a register is selected.
>      ACT is the type of action the command is doing on register.
>     -SMATCH accept a boolean value to say if command accept non matching register."
>     +SMATCH accept a boolean value to say if the command accepts non-matching
>     +registers."
>        types msg act smatch noconfirm)
> 
> NOCONFIRM is not documented (my fault).
> When set to nil don't request confirmation with RET.
> 
> Otherwise all looks good to me, thanks.

Thanks, I fixed all of the above, and I'm therefore closing this bug.

[Message part 3 (message/rfc822, inline)]
From: Thierry Volpiatto <thievol <at> posteo.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.1; Make register-read-with-preview more useful
Date: Sat, 07 Oct 2023 19:03:47 +0000
When using `copy-to-register`, it is hard to see which register is
already taken in the preview buffer.
This patch highlight the register entered at prompt if it is already
taken otherwise a minibuffer message is sent to notify user the register
is available.
If any interest here is the patch, feel free to modify if needed.
Thanks.

diff --git a/lisp/register.el b/lisp/register.el
index ca6de450993..4c83264d4eb 100644
--- a/lisp/register.el
+++ b/lisp/register.el
@@ -154,27 +154,37 @@ listing existing registers after `register-preview-delay' seconds.
 If `help-char' (or a member of `help-event-list') is pressed,
 display such a window regardless."
   (let* ((buffer "*Register Preview*")
-	 (timer (when (numberp register-preview-delay)
-		  (run-with-timer register-preview-delay nil
-				  (lambda ()
-				    (unless (get-buffer-window buffer)
-				      (register-preview buffer))))))
-	 (help-chars (cl-loop for c in (cons help-char help-event-list)
-			      when (not (get-register c))
-			      collect c)))
+         (pat "")
+         result timer)
+    (register-preview buffer)
     (unwind-protect
-	(progn
-	  (while (memq (read-key (propertize prompt 'face 'minibuffer-prompt))
-		       help-chars)
-	    (unless (get-buffer-window buffer)
-	      (register-preview buffer 'show-empty)))
-          (when (or (eq ?\C-g last-input-event)
-                    (eq 'escape last-input-event)
-                    (eq ?\C-\[ last-input-event))
-            (keyboard-quit))
-	  (if (characterp last-input-event) last-input-event
-	    (error "Non-character input-event")))
-      (and (timerp timer) (cancel-timer timer))
+         (progn
+           (minibuffer-with-setup-hook
+               (lambda ()
+                 (setq timer
+                       (run-with-idle-timer
+                        0.3 'repeat
+                        (lambda ()
+                          (with-selected-window (minibuffer-window)
+                            (let ((input (minibuffer-contents)))
+                              (when (not (string= input pat))
+                                (setq pat input))))
+                          (with-current-buffer buffer
+                            (let ((ov (make-overlay (point-min) (point-min))))
+                              (goto-char (point-min))
+                              (if (string= pat "")
+                                  (remove-overlays)
+                                (if (re-search-forward (concat "^" pat) nil t)
+                                    (progn (move-overlay
+                                            ov
+                                            (match-beginning 0) (match-end 0))
+                                           (overlay-put ov 'face 'helm-match))
+                                  (with-selected-window (minibuffer-window)
+                                    (minibuffer-message
+                                     "Register `%s' is available" pat))))))))))
+             (setq result (read-from-minibuffer prompt)))
+           (string-to-char result))
+      (when timer (cancel-timer timer))
       (let ((w (get-buffer-window buffer)))
         (and (window-live-p w) (delete-window w)))
       (and (get-buffer buffer) (kill-buffer buffer)))))



In GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
version 1.16.0, Xaw3d scroll bars) of 2023-10-01 built on IPad-S340
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Linux Mint 21.2

Configured using:
 'configure CFLAGS=-O8 --bindir=/usr/local/sbin/emacs-29.1 --with-cairo
--with-x-toolkit=lucid --with-modules --without-tree-sitter
--without-native-compilation'

Configured features:
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JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY
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Load-path shadows:
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Memory information:
((conses 16 854462 334476)
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<#secure method=pgpmime mode=sign>

-- 
Thierry



This bug report was last modified 1 year and 210 days ago.

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