bug#56183: 29.0.50; read-from-minibuffer does not result with default value

bug#56183: 29.0.50; read-from-minibuffer does not result with default value

[Jean Louis]

How I understand the "default" is that it should be the value
that function gives as result in case when user does not write
anything else, hits enter.

However, it does not work this way with `read-from-minibuffer',
so I will file bug report.

(read-from-minibuffer "Your name: " nil nil nil nil "Jean") ⇒ ""

However, in this function it does work the expected way:

(completing-read "Your name: " '("Jean" "Emmanuel" "Adebayo") nil nil nil nil "Jean") ⇒ "Jean"

(completing-read "Your name: " '("Jean" "Emmanuel" "Adebayo") nil nil nil nil "Adebayo") ⇒ "Adebayo"



In GNU Emacs 29.0.50 (build 10, x86_64-pc-linux-gnu, X toolkit, cairo version 1.17.6, Xaw3d scroll bars)
 of 2022-06-18 built on protected.rcdrun.com
Repository revision: 99577312f569e22f05a4d0960cc881ff46d4dc3a
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
System Description: Parabola GNU/Linux-libre

Configured using:
 'configure --with-x-toolkit=lucid'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY
PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
WEBP X11 XAW3D XDBE XIM XINPUT2 XPM LUCID ZLIB

Important settings:
  value of $LC_ALL: en_US.UTF-8
  value of $LANG: de_DE.UTF-8
  value of $XMODIFIERS: @im=exwm-xim
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media rmc puny
dired dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg
rfc6068 epg-config gnus-util text-property-search time-date seq gv
subr-x byte-opt bytecomp byte-compile cconv mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs
cl-lib sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils
iso-transl tooltip eldoc paren electric uniquify ediff-hook vc-hooks
lisp-float-type elisp-mode 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 lisp-mode prog-mode register 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
simple cl-generic indonesian philippine 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 emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
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 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 47056 8487)
 (symbols 48 6255 3)
 (strings 32 17744 2189)
 (string-bytes 1 558767)
 (vectors 16 12163)
 (vector-slots 8 172412 13460)
 (floats 8 22 38)
 (intervals 56 246 0)
 (buffers 992 11))

-- 
Thanks,
Jean Louis

Take action in Free Software Foundation campaigns:
https://www.fsf.org/campaigns

bug#56183: 29.0.50; read-from-minibuffer does not result with default value

[Visuwesh]

[வெள்ளி ஜூன் 24, 2022] Jean Louis wrote:

> How I understand the "default" is that it should be the value
> that function gives as result in case when user does not write
> anything else, hits enter.
>
> However, it does not work this way with `read-from-minibuffer',
> so I will file bug report.
>
> (read-from-minibuffer "Your name: " nil nil nil nil "Jean") ⇒ ""
>

As the docstring of read-from-minibuffer says, READ should be non-nil if
DEFAULT-VALUE is to be returned:

    Sixth arg DEFAULT-VALUE, if non-nil, should be a string, which is used
      as the default to ‘read’ if READ is non-nil and the user enters
      empty input.  But if READ is nil, this function does _not_ return
      DEFAULT-VALUE for empty input!  Instead, it returns the empty string.

so everything works as expected.

Try (read-from-minibuffer "Your name: " nil nil t nil "Jean") instead.

> However, in this function it does work the expected way:
>
> (completing-read "Your name: " '("Jean" "Emmanuel" "Adebayo") nil nil nil nil "Jean") ⇒ "Jean"
>
> (completing-read "Your name: " '("Jean" "Emmanuel" "Adebayo") nil nil nil nil "Adebayo") ⇒ "Adebayo"
>
>
>
> In GNU Emacs 29.0.50 (build 10, x86_64-pc-linux-gnu, X toolkit, cairo version 1.17.6, Xaw3d scroll bars)
>  of 2022-06-18 built on protected.rcdrun.com
> Repository revision: 99577312f569e22f05a4d0960cc881ff46d4dc3a
> Repository branch: master
> Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
> System Description: Parabola GNU/Linux-libre
>
> Configured using:
>  'configure --with-x-toolkit=lucid'
>
> Configured features:
> ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
> JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY
> PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
> WEBP X11 XAW3D XDBE XIM XINPUT2 XPM LUCID ZLIB
>
> Important settings:
>   value of $LC_ALL: en_US.UTF-8
>   value of $LANG: de_DE.UTF-8
>   value of $XMODIFIERS: @im=exwm-xim
>   locale-coding-system: utf-8-unix
>
> Major mode: Lisp Interaction
>
> Minor modes in effect:
>   tooltip-mode: t
>   global-eldoc-mode: t
>   eldoc-mode: t
>   show-paren-mode: t
>   electric-indent-mode: t
>   mouse-wheel-mode: t
>   tool-bar-mode: t
>   menu-bar-mode: t
>   file-name-shadow-mode: t
>   global-font-lock-mode: t
>   font-lock-mode: t
>   blink-cursor-mode: t
>   line-number-mode: t
>   indent-tabs-mode: t
>   transient-mark-mode: t
>   auto-composition-mode: t
>   auto-encryption-mode: t
>   auto-compression-mode: t
>
> Load-path shadows:
> None found.
>
> Features:
> (shadow sort mail-extr emacsbug message mailcap yank-media rmc puny
> dired dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg
> rfc6068 epg-config gnus-util text-property-search time-date seq gv
> subr-x byte-opt bytecomp byte-compile cconv mm-decode mm-bodies
> mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs
> cl-lib sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils
> iso-transl tooltip eldoc paren electric uniquify ediff-hook vc-hooks
> lisp-float-type elisp-mode 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 lisp-mode prog-mode register 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
> simple cl-generic indonesian philippine 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 emoji-zwj charscript charprop case-table
> epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
> 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 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 47056 8487)
>  (symbols 48 6255 3)
>  (strings 32 17744 2189)
>  (string-bytes 1 558767)
>  (vectors 16 12163)
>  (vector-slots 8 172412 13460)
>  (floats 8 22 38)
>  (intervals 56 246 0)
>  (buffers 992 11))

bug#56183: 29.0.50; read-from-minibuffer does not result with default value

[Lars Ingebrigtsen]

Visuwesh <visuweshm@gmail.com> writes:

> As the docstring of read-from-minibuffer says, READ should be non-nil if
> DEFAULT-VALUE is to be returned:
>
>     Sixth arg DEFAULT-VALUE, if non-nil, should be a string, which is used
>       as the default to ‘read’ if READ is non-nil and the user enters
>       empty input.  But if READ is nil, this function does _not_ return
>       DEFAULT-VALUE for empty input!  Instead, it returns the empty string.
>
> so everything works as expected.

Yup.  So I'm closing this bug report.

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