bug#25482: 26.0.50; Allow setting `query-replace-from-to-separator` to nil

[Thierry Volpiatto]

Actually it is not possible to customize easily
`query-replace-from-to-separator` and it is impossible to set it to nil.

If I use `setq`, `custom-reevaluate-setting` reevaluate the original
sexp from `query-replace-from-to-separator` and if I use customize I can
add a string or a sexp, nothing else.
But the code in `query-replace-read-from` is checking if
`query-replace-from-to-separator` is non-nil, which is impossible
actually.
Thus it adds difficulties to load such sexp when dumping emacs.

I would expect setting `query-replace-from-to-separator` to nil to
retrieve same behavior as emacs-24.5 and not have unicode strings in my
minibuffer-history.

This patch allow this, please review it.

Thanks.

diff --git a/lisp/replace.el b/lisp/replace.el
index ff917344453..dfc991b1691 100644
--- a/lisp/replace.el
+++ b/lisp/replace.el
@@ -79,15 +79,15 @@ That becomes the \"string to replace\".")
 to the minibuffer that reads the string to replace, or invoke replacements
 from Isearch by using a key sequence like `C-s C-s M-%'." "24.3")
 
-(defcustom query-replace-from-to-separator
-  (propertize (if (char-displayable-p ?→) " → " " -> ")
-              'face 'minibuffer-prompt)
-  "String that separates FROM and TO in the history of replacement pairs."
-  ;; Avoids error when attempt to autoload char-displayable-p fails
-  ;; while preparing to dump, also stops customize-rogue listing this.
-  :initialize 'custom-initialize-delay
+(defcustom query-replace-from-to-separator " → "
+  "String that separates FROM and TO in the history of replacement pairs.
+When nil the default separator \" -> \" will be used as a plain string
+and the pair will not be added to `query-replace-history'
+\(Same behavior as in emacs 24.5)."
   :group 'matching
-  :type '(choice string (sexp :tag "Display specification"))
+  :type '(choice
+          (const :tag "Disabled" nil)
+          string)
   :version "25.1")
 
 (defcustom query-replace-from-history-variable 'query-replace-history
@@ -165,9 +165,13 @@ The return value can also be a pair (FROM . TO) indicating 
that the user
 wants to replace FROM with TO."
   (if query-replace-interactive
       (car (if regexp-flag regexp-search-ring search-ring))
-    ;; Reevaluating will check char-displayable-p that is
-    ;; unavailable while preparing to dump.
-    (custom-reevaluate-setting 'query-replace-from-to-separator)
+    (when (stringp query-replace-from-to-separator)
+      (setq query-replace-from-to-separator
+            (propertize (if (char-displayable-p
+                             (string-to-char query-replace-from-to-separator))
+                            query-replace-from-to-separator
+                          " -> ")
+                        'face 'minibuffer-prompt)))
     (let* ((history-add-new-input nil)
           (separator
            (when query-replace-from-to-separator
@@ -185,9 +189,13 @@ wants to replace FROM with TO."
             (symbol-value query-replace-from-history-variable)))
           (minibuffer-allow-text-properties t) ; separator uses text-properties
           (prompt
-           (if (and query-replace-defaults separator)
-               (format "%s (default %s): " prompt (car minibuffer-history))
-             (format "%s: " prompt)))
+           (cond ((and query-replace-defaults separator)
+                   (format "%s (default %s): " prompt (car 
minibuffer-history)))
+                  (query-replace-defaults
+                   (format "%s (default %s -> %s): " prompt
+                           (query-replace-descr (caar query-replace-defaults))
+                           (query-replace-descr (cdar 
query-replace-defaults))))
+                  (t (format "%s: " prompt))))
           (from
            ;; The save-excursion here is in case the user marks and copies
            ;; a region in order to specify the minibuffer input.




In GNU Emacs 26.0.50.2 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2017-01-06 built on dell-14z
Repository revision: 1d714e41ea73af89b56fb4bf19f8f0c3f443c268
Windowing system distributor 'The X.Org Foundation', version 11.0.11701000
System Description:     Linux Mint 17.3 Rosa

Recent messages:
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Configured using:
 'configure CFLAGS=-O3'

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

Important settings:
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  value of $LC_NUMERIC: fr_FR.UTF-8
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url-http tls gnutls url-auth url-gw nsm disable-mouse powerline
powerline-separators color powerline-themes windmove benchmark-init
toc-org ert ewoc debug elp cl-indent esh-var esh-io esh-cmd esh-opt
esh-ext esh-proc esh-arg esh-groups eshell esh-module esh-mode esh-util
markdown-mode addressbook-bookmark mu4e-config org-mu4e helm-mu
mu4e-contrib mu4e desktop frameset mu4e-speedbar speedbar sb-image
ezimage dframe mu4e-main mu4e-context mu4e-view mu4e-headers
mu4e-compose mu4e-draft mu4e-actions ido rfc2368 smtpmail sendmail
mu4e-mark mu4e-message html2text mu4e-proc mu4e-utils mu4e-lists
mu4e-vars hl-line cl mu4e-meta config-w3m w3m-search w3m doc-view
jka-compr timezone w3m-hist w3m-fb bookmark-w3m w3m-ems w3m-ccl ccl
w3m-favicon w3m-image w3m-proc w3m-util git-gutter cus-edit wid-edit
appt diary-lib diary-loaddefs ange-ftp xdvi-search eldoc-eval undo-tree
diff magit-obsolete magit-blame magit-stash magit-bisect magit-remote
magit-commit magit-sequence magit-notes magit-worktree magit-branch
magit-files magit-refs magit-status magit magit-repos magit-apply
magit-wip magit-log magit-diff smerge-mode diff-mode magit-core
magit-autorevert autorevert filenotify magit-process magit-margin
magit-mode magit-git crm magit-section magit-popup git-commit
magit-utils log-edit message subr-x puny rfc822 mml mml-sec epa derived
epg epg-config gnus-util rmail rmail-loaddefs mm-decode mm-bodies
mm-encode mail-parse rfc2231 rfc2047 rfc2045 mm-util ietf-drums
mail-prsvr mailabbrev mail-utils gmm-utils mailheader pcvs-util add-log
with-editor tramp-sh server pcomplete-extension pcmpl-unix pcmpl-gnu
psession iterator iedit iedit-lib dired-extension org-config-thierry
ob-sh org-crypt org-element avl-tree org-location-google-maps org-agenda
google-maps google-maps-static google-maps-geocode google-maps-base org
org-macro org-footnote org-pcomplete org-list org-faces org-entities
noutline outline org-version ob-emacs-lisp ob ob-tangle org-src ob-ref
ob-lob ob-table ob-keys ob-exp ob-comint ob-core ob-eval org-compat
org-macs org-loaddefs find-func cal-menu calendar cal-loaddefs
dired-async net-utils time winner w3m-wget wget wget-sysdep cmake-mode
autotest-mode autoconf-mode sh-script smie executable ps-print
ps-print-loaddefs ps-def lpr rst image-file savehist paren woman man
ediff-merg ediff-wind ediff-diff ediff-mult ediff-help ediff-init
ediff-util ediff init-helm-thierry helm-descbinds helm-sys popup
helm-ring helm-elisp helm-eval edebug helm-mode helm-files image-dired
image-mode tramp tramp-compat tramp-loaddefs trampver shell pcomplete
parse-time format-spec dired-x dired-aux ffap thingatpt helm-buffers
helm-elscreen helm-tags helm-bookmark helm-adaptive helm-info bookmark
pp helm-locate helm-grep wgrep-helm wgrep grep helm-regexp helm-external
helm-net browse-url xml url url-proxy url-privacy url-expand url-methods
url-history url-cookie url-domsuf url-util mailcap helm-utils compile
comint ansi-color ring helm-help helm-types helm helm-source
helm-multi-match helm-lib dired dired-loaddefs helm-extensions-autoloads
helm-config helm-autoloads helm-easymenu async-bytecomp advice async
mb-depth edmacro kmacro use-package diminish bind-key easy-mmode
finder-inf tex-site gh-common gh-profile rx s ucs-normalize marshal
eieio-compat ht json map dash slime-autoloads info package url-handlers
url-parse auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs
password-cache url-vars seq byte-opt gv bytecomp byte-compile cl-extra
help-mode easymenu cconv time-date avoid cus-start cus-load cl-loaddefs
pcase cl-lib mule-util tooltip eldoc electric uniquify ediff-hook
vc-hooks lisp-float-type mwheel term/x-win x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow isearch timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core term/tty-colors frame cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite charscript
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 878437 367693)
 (symbols 48 66030 13)
 (miscs 40 9143 3337)
 (strings 32 204861 111153)
 (string-bytes 1 7231121)
 (vectors 16 104738)
 (vector-slots 8 1950618 149106)
 (floats 8 3475 3306)
 (intervals 56 12606 6385)
 (buffers 976 203)
 (heap 1024 108498 9771))

-- 
Thierry