GNU bug report logs - #16330
24.3; wish: after hitting a prefix-key, show possible options

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

From: Arne Babenhauserheide <arne_bab <at> web.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; wish: after hitting a prefix-key, show possible options
Date: Fri, 03 Jan 2014 18:13:43 +0100

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and the GNU bug tracker at debbugs.gnu.org.  Please check that
the From: line contains a valid email address.  After a delay of up
to one day, you should receive an acknowledgment at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

Dear Wmacs Hackers,

I often find myself in a position where I still know some prefix key, but not the second key. For example I hit `C-c /` in mailcrypt-mode, but I'm not sure whether I fetch the key with `k` or with `f` (the latter actually calls forget passphrase). In that case, I am forced to either consult C-h m or use the menu - both of which does not feel very elegant.

Instead of that, it would be nice if emacs could show a completion-list similar to the function completion with M-x. This would allow discovering options while using emacs instead of browsing menus or tutorials, hunting for new ways of working more efficiently.

Best wishes,
Arne

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/usr/share/emacs/24.3/etc/DEBUG.


In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.4.4)
 of 2013-09-01 on kaverne
System Description:	Gentoo Base System release 2.2

Configured using:
 `configure '--prefix=/usr' '--build=x86_64-pc-linux-gnu'
 '--host=x86_64-pc-linux-gnu' '--mandir=/usr/share/man'
 '--infodir=/usr/share/info' '--datadir=/usr/share'
 '--sysconfdir=/etc' '--localstatedir=/var/lib' '--libdir=/usr/lib64'
 '--disable-silent-rules' '--disable-dependency-tracking'
 '--program-suffix=-emacs-24' '--infodir=/usr/share/info/emacs-24'
 '--enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/../../../../lib64'
 '--with-gameuser=games' '--without-compress-info' '--without-hesiod'
 '--without-kerberos' '--without-kerberos5' '--without-gpm'
 '--without-dbus' '--without-gnutls' '--without-xml2'
 '--without-selinux' '--without-wide-int' '--without-sound' '--with-x'
 '--without-ns' '--without-gconf' '--without-gsettings'
 '--without-toolkit-scroll-bars' '--without-gif' '--without-jpeg'
 '--without-png' '--without-rsvg' '--without-tiff' '--with-xpm'
 '--without-imagemagick' '--without-xft' '--without-libotf'
 '--without-m17n-flt' '--with-x-toolkit=gtk3'
 'GENTOO_PACKAGE=app-editors/emacs-24.3-r2'
 'build_alias=x86_64-pc-linux-gnu' 'host_alias=x86_64-pc-linux-gnu'
 'CFLAGS=-O2 -pipe -march=native' 'LDFLAGS=-Wl,-O1 -Wl,--as-needed'
 'CPPFLAGS=''

Important settings:
  value of $LC_ALL: de_DE.utf8
  value of $LANG: de_DE.utf8
  locale-coding-system: utf-8
  default enable-multibyte-characters: t

Major mode: Summary

Minor modes in effect:
  gpm-mouse-mode: t
  global-auto-revert-mode: t
  global-ethan-wspace-mode: t
  real-global-auto-complete-mode: t
  global-rudel-minor-mode: t
  savehist-mode: t
  recentf-mode: t
  kde-default-keys-minor-mode: t
  shell-dirtrack-mode: t
  global-auto-complete-mode: t
  auto-complete-mode: t
  show-paren-mode: t
  display-time-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Recent input:
ESC v ESC [ A ESC [ A ESC [ A ESC [ A ESC [ A ESC [ 
A ESC [ A RET RET RET RET RET RET RET RET RET RET RET 
RET ESC [ A C-x o ESC v C-x o C-x o C-x C-c 1 C-g C-x 
1 ESC v ESC v ESC [ A ESC [ A ESC [ A ESC [ A ESC [ 
A ESC [ A ESC [ A ESC [ A ESC [ A ESC [ A ESC [ A ESC 
[ A ESC [ A ESC [ A ESC [ A RET RET RET RET RET RET 
ESC [ 2 1 ~ DEL DEL DEL DEL DEL DEL DEL DEL DEL TAB 
TAB s TAB DEL DEL DEL DEL DEL DEL DEL DEL DEL DEL DEL 
DEL DEL DEL DEL DEL DEL DEL DEL DEL DEL DEL DEL DEL 
DEL DEL DEL DEL DEL DEL DEL DEL DEL DEL TAB TAB TAB 
TAB TAB ESC x C-g ESC x w l - m a r k - u n r e d TAB 
ESC [ D a ESC [ C TAB ESC [ D ESC [ D ESC [ D ESC [ 
D ESC [ D ESC [ D ESC [ D ESC [ D ESC [ D ESC [ D ESC 
[ D ESC [ D ESC [ D ESC [ D ESC [ D ESC [ C ESC [ C 
TAB TAB s u DEL u TAB TAB RET ESC [ C ESC [ C ESC [ 
C ESC [ C ESC [ C ESC [ C a TAB RET ESC [ A ESC [ A 
ESC [ B ESC x r e p o r t - e m a c s - b u g RET

Recent messages:
Quit
Making completion list...
delete-backward-char: Text is read-only
Making completion list... [3 times]
Quit [3 times]
Making completion list...
Auto-saving bbdb: Opening output file: datei oder Verzeichnis nicht gefunden, /home/arne/.local/share/emacs-autosaves/#!home!arne!.emacs.d!private!bbdb#
Making completion list... [2 times]
You can run the command `wl-summary-mark-as-unread' with !
call-interactively: End of buffer [2 times]

Load-path shadows:
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/usr/share/emacs/site-lisp/org-mode/org-info hides /usr/share/emacs/24.3/lisp/org/org-info
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/usr/share/emacs/site-lisp/org-mode/org-attach hides /usr/share/emacs/24.3/lisp/org/org-attach
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/usr/share/emacs/site-lisp/org-mode/ob-R hides /usr/share/emacs/24.3/lisp/org/ob-R
/usr/share/emacs/site-lisp/org-mode/org-ctags hides /usr/share/emacs/24.3/lisp/org/org-ctags
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/usr/share/emacs/site-lisp/org-mode/ob-lilypond hides /usr/share/emacs/24.3/lisp/org/ob-lilypond
/usr/share/emacs/site-lisp/org-mode/org-indent hides /usr/share/emacs/24.3/lisp/org/org-indent
/usr/share/emacs/site-lisp/org-mode/org-inlinetask hides /usr/share/emacs/24.3/lisp/org/org-inlinetask
/usr/share/emacs/site-lisp/org-mode/org-eshell hides /usr/share/emacs/24.3/lisp/org/org-eshell
/usr/share/emacs/site-lisp/org-mode/ob-plantuml hides /usr/share/emacs/24.3/lisp/org/ob-plantuml
/usr/share/emacs/site-lisp/org-mode/ob-dot hides /usr/share/emacs/24.3/lisp/org/ob-dot
/usr/share/emacs/site-lisp/org-mode/ob-ref hides /usr/share/emacs/24.3/lisp/org/ob-ref
/usr/share/emacs/site-lisp/org-mode/org-crypt hides /usr/share/emacs/24.3/lisp/org/org-crypt
/usr/share/emacs/site-lisp/org-mode/org-pcomplete hides /usr/share/emacs/24.3/lisp/org/org-pcomplete
/usr/share/emacs/site-lisp/org-mode/org-version hides /usr/share/emacs/24.3/lisp/org/org-version
/usr/share/emacs/site-lisp/org-mode/ob-sass hides /usr/share/emacs/24.3/lisp/org/ob-sass
/usr/share/emacs/site-lisp/org-mode/org-protocol hides /usr/share/emacs/24.3/lisp/org/org-protocol
/usr/share/emacs/site-lisp/org-mode/org-mhe hides /usr/share/emacs/24.3/lisp/org/org-mhe
/usr/share/emacs/site-lisp/org-mode/ob-perl hides /usr/share/emacs/24.3/lisp/org/ob-perl
/usr/share/emacs/site-lisp/org-mode/ob-fortran hides /usr/share/emacs/24.3/lisp/org/ob-fortran
/usr/share/emacs/site-lisp/org-mode/ob-sqlite hides /usr/share/emacs/24.3/lisp/org/ob-sqlite
/usr/share/emacs/site-lisp/org-mode/org-install hides /usr/share/emacs/24.3/lisp/org/org-install
/usr/share/emacs/site-lisp/org-mode/ob-shen hides /usr/share/emacs/24.3/lisp/org/ob-shen
/usr/share/emacs/site-lisp/org-mode/ob-eval hides /usr/share/emacs/24.3/lisp/org/ob-eval
/usr/share/emacs/site-lisp/org-mode/ob-io hides /usr/share/emacs/24.3/lisp/org/ob-io
/usr/share/emacs/site-lisp/org-mode/org-src hides /usr/share/emacs/24.3/lisp/org/org-src
/usr/share/emacs/site-lisp/org-mode/ob-java hides /usr/share/emacs/24.3/lisp/org/ob-java
/usr/share/emacs/site-lisp/org-mode/ob-asymptote hides /usr/share/emacs/24.3/lisp/org/ob-asymptote
/usr/share/emacs/site-lisp/org-mode/ob hides /usr/share/emacs/24.3/lisp/org/ob
/usr/share/emacs/site-lisp/org-mode/org-macs hides /usr/share/emacs/24.3/lisp/org/org-macs
/usr/share/emacs/site-lisp/org-mode/ob-sh hides /usr/share/emacs/24.3/lisp/org/ob-sh
/usr/share/emacs/site-lisp/org-mode/ob-ruby hides /usr/share/emacs/24.3/lisp/org/ob-ruby
/usr/share/emacs/site-lisp/org-mode/ob-keys hides /usr/share/emacs/24.3/lisp/org/ob-keys
/usr/share/emacs/site-lisp/org-mode/org-capture hides /usr/share/emacs/24.3/lisp/org/org-capture
/usr/share/emacs/site-lisp/org-mode/org-feed hides /usr/share/emacs/24.3/lisp/org/org-feed
/usr/share/emacs/site-lisp/org-mode/org-agenda hides /usr/share/emacs/24.3/lisp/org/org-agenda
/usr/share/emacs/site-lisp/org-mode/org-mobile hides /usr/share/emacs/24.3/lisp/org/org-mobile
/usr/share/emacs/site-lisp/org-mode/org-entities hides /usr/share/emacs/24.3/lisp/org/org-entities
/usr/share/emacs/site-lisp/org-mode/org-colview hides /usr/share/emacs/24.3/lisp/org/org-colview
/usr/share/emacs/site-lisp/org-mode/ob-clojure hides /usr/share/emacs/24.3/lisp/org/ob-clojure
/usr/share/emacs/site-lisp/org-mode/ob-tangle hides /usr/share/emacs/24.3/lisp/org/ob-tangle
/usr/share/emacs/site-lisp/org-mode/org-datetree hides /usr/share/emacs/24.3/lisp/org/org-datetree
/usr/share/emacs/site-lisp/org-mode/ob-lob hides /usr/share/emacs/24.3/lisp/org/ob-lob
/usr/share/emacs/site-lisp/org-mode/org-loaddefs hides /usr/share/emacs/24.3/lisp/org/org-loaddefs
/usr/share/emacs/site-lisp/org-mode/org-w3m hides /usr/share/emacs/24.3/lisp/org/org-w3m
/usr/share/emacs/site-lisp/org-mode/org hides /usr/share/emacs/24.3/lisp/org/org
/usr/share/emacs/site-lisp/org-mode/ob-ditaa hides /usr/share/emacs/24.3/lisp/org/ob-ditaa
/usr/share/emacs/site-lisp/org-mode/ob-screen hides /usr/share/emacs/24.3/lisp/org/ob-screen
/usr/share/emacs/site-lisp/org-mode/ob-python hides /usr/share/emacs/24.3/lisp/org/ob-python
/usr/share/emacs/site-lisp/org-mode/ob-table hides /usr/share/emacs/24.3/lisp/org/ob-table
/usr/share/emacs/site-lisp/org-mode/org-bbdb hides /usr/share/emacs/24.3/lisp/org/org-bbdb
/usr/share/emacs/site-lisp/org-mode/ob-mscgen hides /usr/share/emacs/24.3/lisp/org/ob-mscgen
/usr/share/emacs/site-lisp/org-mode/org-mouse hides /usr/share/emacs/24.3/lisp/org/org-mouse
/usr/share/emacs/site-lisp/org-mode/ob-sql hides /usr/share/emacs/24.3/lisp/org/ob-sql
/usr/share/emacs/site-lisp/org-mode/org-archive hides /usr/share/emacs/24.3/lisp/org/org-archive
/usr/share/emacs/site-lisp/org-mode/ob-calc hides /usr/share/emacs/24.3/lisp/org/ob-calc
/usr/share/emacs/site-lisp/org-mode/org-bibtex hides /usr/share/emacs/24.3/lisp/org/org-bibtex
/usr/share/emacs/site-lisp/org-mode/ob-exp hides /usr/share/emacs/24.3/lisp/org/ob-exp
/usr/share/emacs/site-lisp/org-mode/ob-ledger hides /usr/share/emacs/24.3/lisp/org/ob-ledger
/usr/share/emacs/site-lisp/flim/hmac-md5 hides /usr/share/emacs/24.3/lisp/net/hmac-md5
/usr/share/emacs/site-lisp/flim/sasl-cram hides /usr/share/emacs/24.3/lisp/net/sasl-cram
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Features:
(shadow emacsbug message idna mml mml-sec mm-decode mm-bodies
mm-encode gmm-utils mailheader help-mode tmm electric flow-fill smtp
sasl sasl-anonymous sasl-login sasl-plain bbdb-gui wl-score mule-util
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t-mouse server activate-babenv eimp reftex-parse autorevert reftex-dcr
reftex-auc outline-magic ispell org-rmail org-mhe org-irc org-info
org-gnus org-docview org-bibtex org-bbdb org-w3m font-lock-tm5rc
generic activate-wanderlust private-wanderlust-kaverne bbdb-wl
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wl-news wl-address wl-thread wl-action wl-summary wl-refile wl-message
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elmo-signal elmo-msgdb modb modb-generic modb-entity mime elmo-util
emu invisible inv-23 poem poem-e20 poem-e20_3 utf7 eword-decode mel
mime-def std11 mcharset mcs-20 mcs-e20 pces pces-e20 pces-20 broken
pcustom elmo-date elmo-vars elmo-version luna activate-private-data
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w3m-ems w3m-ccl ccl w3m-favicon w3m-image w3m-proc w3m-util apps
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pydoc-info info-look info python-magic python rx stenochords
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org-agenda footnote activate-emms emms-cache emms-info-ogginfo
emms-info-mp3info emms-info later-do emms-playlist-mode
emms-player-mplayer emms-player-simple emms-source-playlist
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eieio-speedbar speedbar sb-image ezimage dframe eieio-custom
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org-custom-link-completion reftex reftex-vars reftex-cite
activate-quick-note remember-bbdb remember bbdb-vcard bbdb-com
mailabbrev vcard rainbow-text thingatpt babcore legalese savehist
recentf tree-widget wid-edit epa-file epa derived epg epg-config
fic-ext-mode key-chord control-lock goto-chg ob-sh shell ob-python
ob-org ob-gnuplot ob-dot ob-ditaa ob-R ob-C cc-mode cc-fonts cc-guess
cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs org
warnings org-macro org-footnote org-pcomplete pcomplete org-list
org-faces org-entities noutline outline easy-mmode org-version
ob-emacs-lisp ob ob-tangle org-src ob-ref ob-lob ob-table ob-keys
ob-exp ob-comint comint ansi-color ring ob-core ob-eval org-compat
org-macs org-loaddefs format-spec find-func cal-menu calendar
cal-loaddefs allout cups easymenu printing ps-print ps-def lpr ido
auto-complete edmacro kmacro popup flymake-cursor cl-macs gv cl
finder-inf parse-time mail-utils network-stream starttls url-http tls
mail-parse rfc2231 rfc2047 rfc2045 ietf-drums url-gw url-cache
url-auth url url-proxy url-privacy url-expand url-methods url-history
url-cookie url-domsuf url-util url-parse auth-source eieio byte-opt
bytecomp byte-compile cconv gnus-util mm-util mail-prsvr
password-cache url-vars mailcap legalese-autoloads package
activate-base vc-hg bookmark pp saveplace time-date uniquify advice
help-fns cl-lib advice-preload paren time cus-start cus-load
site-gentoo w3m-load mime-setup mail-mime-setup alist semi-setup
path-util poe pym static apel-ver product semi-def emms-auto
bbdb-autoloads bbdb timezone tex-site auto-loads tooltip ediff-hook
vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list newcomment lisp-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process
dynamic-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Message #8 received at 16330 <at> debbugs.gnu.org (full text, mbox):

From: Drew Adams <drew.adams <at> oracle.com>
To: arne_bab <at> web.de, 16330 <at> debbugs.gnu.org
Subject: RE: bug#16330: 24.3; wish: after hitting a prefix-key, show possible
 options
Date: Fri, 3 Jan 2014 09:26:46 -0800 (PST)

> I often find myself in a position where I still know some prefix
> key, but not the second key. For example I hit `C-c /` in mailcrypt-
> mode, but I'm not sure whether I fetch the key with `k` or with `f`
> (the latter actually calls forget passphrase). In that case, I am
> forced to either consult C-h m or use the menu - both of which does
> not feel very elegant.
> 
> Instead of that, it would be nice if emacs could show a completion-
> list similar to the function completion with M-x. This would allow
> discovering options while using emacs instead of browsing menus or
> tutorials, hunting for new ways of working more efficiently.

1. You can hit `C-h' to see the list of keys that start with that
prefix key.  E.g., `C-c / C-h' shows you all of the keys that start
with prefix key `C-c /'.

2. If you use Icicles then you can hit `S-TAB' to complete the
prefix key.  Buffer *Completions* shows the possible completions.
Type text matching the rest of the key name to finish the key.

http://www.emacswiki.org/emacs/Icicles_-_Key_Completion

#1 is available in vanilla Emacs.  It might well be all you need.

#2 requires Icicles.  It corresponds more exactly to what you
requested, IIUC.

Message #13 received at 16330-done <at> debbugs.gnu.org (full text, mbox):

From: Leo Liu <sdl.web <at> gmail.com>
To: arne_bab <at> web.de
Cc: 16330-done <at> debbugs.gnu.org
Subject: Re: bug#16330: 24.3;
 wish: after hitting a prefix-key, show possible options
Date: Sat, 04 Jan 2014 08:31:55 +0800

Not a bug

On 2014-01-04 01:13 +0800, Arne Babenhauserheide wrote:
> I often find myself in a position where I still know some prefix key,
> but not the second key. For example I hit `C-c /` in mailcrypt-mode,
> but I'm not sure whether I fetch the key with `k` or with `f` (the
> latter actually calls forget passphrase). In that case, I am forced to
> either consult C-h m or use the menu - both of which does not feel
> very elegant.

You can easily type C-h to get a list of keys available on any prefix.
If Prefix + C-h is shadowed, use Prefix + ?. In your case C-c / ? or C-c
/ C-h. C-c / ? only works in trunk i.e. 24.4

HTH,
Leo

Message #16 received at 16330 <at> debbugs.gnu.org (full text, mbox):

From: Arne Babenhauserheide <arne_bab <at> web.de>
To: Drew Adams <drew.adams <at> oracle.com>
Cc: arne_bab <at> web.de, 16330 <at> debbugs.gnu.org
Subject: Re: bug#16330: 24.3;
 wish: after hitting a prefix-key, show possible options
Date: Sat, 04 Jan 2014 15:15:06 +0100

At Fri, 3 Jan 2014 09:26:46 -0800 (PST),
Drew Adams wrote:
> 1. You can hit `C-h' to see the list of keys that start with that
> prefix key.  E.g., `C-c / C-h' shows you all of the keys that start
> with prefix key `C-c /'.

Wow, I did not know that... thanks a lot!

That does what I need. Sorry for the disturbance...

Best wishes,
Arne

PS: Ongoing saga: Emacs can already do it.

Message #19 received at 16330-done <at> debbugs.gnu.org (full text, mbox):

From: Arne Babenhauserheide <arne_bab <at> web.de>
To: Leo Liu <sdl.web <at> gmail.com>
Cc: arne_bab <at> web.de, 16330-done <at> debbugs.gnu.org
Subject: Re: bug#16330: 24.3;
 wish: after hitting a prefix-key, show possible options
Date: Sat, 04 Jan 2014 18:31:25 +0100

At Sat, 04 Jan 2014 08:31:55 +0800,
Leo Liu wrote:
> You can easily type C-h to get a list of keys available on any prefix.
> If Prefix + C-h is shadowed, use Prefix + ?. In your case C-c / ? or C-c
> / C-h. C-c / ? only works in trunk i.e. 24.4

Nice, thanks!
(emacs is suremoving fast again!)

Best wishes,
Arne

Message #22 received at 16330-done <at> debbugs.gnu.org (full text, mbox):

From: Drew Adams <drew.adams <at> oracle.com>
To: arne_bab <at> web.de, Leo Liu <sdl.web <at> gmail.com>
Cc: 16330-done <at> debbugs.gnu.org
Subject: RE: bug#16330: 24.3; wish: after hitting a prefix-key, show possible
 options
Date: Sat, 4 Jan 2014 10:26:53 -0800 (PST)

> Nice, thanks!  (emacs is suremoving fast again!)

FWIW, `C-h' has worked this way forever.

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