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From: Thierry Volpiatto <thievol@posteo.net>
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Subject: bug#66394: 29.1; Make register-read-with-preview more useful
Date: Sat, 07 Oct 2023 19:03:47 +0000
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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-de=
lay' 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=3D input pat))
+                                (setq pat input))))
+                          (with-current-buffer buffer
+                            (let ((ov (make-overlay (point-min) (point-min=
))))
+                              (goto-char (point-min))
+                              (if (string=3D pat "")
+                                  (remove-overlays)
+                                (if (re-search-forward (concat "^" pat) ni=
l t)
+                                    (progn (move-overlay
+                                            ov
+                                            (match-beginning 0) (match-end=
 0))
+                                           (overlay-put ov 'face 'helm-mat=
ch))
+                                  (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=3D-O8 --bindir=3D/usr/local/sbin/emacs-29.1 --with-cairo
--with-x-toolkit=3Dlucid --with-modules --without-tree-sitter
--without-native-compilation'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
X11 XAW3D XDBE XIM XINPUT2 XPM LUCID ZLIB

Important settings:
  value of $LANG: fr_FR.UTF-8
  locale-coding-system: utf-8-unix

Major mode: =EE=A4=A6

Minor modes in effect:
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  emms-playing-time-display-mode: t
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  display-time-mode: t
  winner-mode: t
  tv-save-place-mode: t
  helm-epa-mode: t
  helm-descbinds-mode: t
  helm-top-poll-mode: t
  helm-adaptive-mode: t
  helm-mode: t
  helm-minibuffer-history-mode: t
  helm-ff-icon-mode: t
  shell-dirtrack-mode: t
  helm-popup-tip-mode: t
  async-bytecomp-package-mode: t
  dired-async-mode: t
  minibuffer-depth-indicate-mode: t
  gcmh-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  column-number-mode: t
  line-number-mode: t
  auto-fill-function: do-auto-fill
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(epa-mail face-remap addressbook-bookmark tv-mu4e-config config-w3m
mu4e-contrib eshell esh-cmd generator esh-ext esh-opt esh-proc esh-io
esh-arg esh-module esh-groups esh-util mu4e-patch mu4e mu4e-org
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ob-lob ob-table ob-exp org-macro org-src ob-comint org-pcomplete
org-list org-footnote org-faces org-entities noutline outline
ob-emacs-lisp ob-core ob-eval org-cycle org-table ol org-fold
org-fold-core org-keys oc org-loaddefs org-version org-compat org-macs
mu4e-notification notifications mu4e-main mu4e-view mu4e-mime-parts
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tramp-compat rx shell pcomplete parse-time iso8601 time-date
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helm-source helm-multi-match helm-lib dired-async async dired-aux dired
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gcmh-autoloads info ledger-mode-autoloads markdown-mode-autoloads
nerd-icons-autoloads w3m-load w3m-autoloads yaml-mode-autoloads package
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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
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files window text-properties overlay sha1 md5 base64 format env
code-pages mule custom widget keymap hashtable-print-readable backquote
threads dbusbind inotify lcms2 dynamic-setting system-font-setting
font-render-setting cairo x-toolkit xinput2 x multi-tty
make-network-process emacs)

Memory information:
((conses 16 854462 334476)
 (symbols 48 35404 26)
 (strings 32 219034 39971)
 (string-bytes 1 6357489)
 (vectors 16 99232)
 (vector-slots 8 2128904 396764)
 (floats 8 1791 2270)
 (intervals 56 37515 32129)
 (buffers 976 138))
<#secure method=3Dpgpmime mode=3Dsign>

--=20
Thierry