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bug#18326: 24.4.50; allow-no-window for async-shell-command in temp buff


From: Joe Corneli
Subject: bug#18326: 24.4.50; allow-no-window for async-shell-command in temp buffer
Date: Sun, 24 Aug 2014 19:34:21 +0100

The docs for `async-shell-command' say:

(async-shell-command COMMAND &optional OUTPUT-BUFFER ERROR-BUFFER)
  [...]
  To run COMMAND without displaying the output in a window you can
  configure `display-buffer-alist' to use the action
  `display-buffer-no-window' for the buffer `*Async Shell Command*'.

Referring to further docs and a recent discussion on this list,
https://lists.gnu.org/archive/html/bug-gnu-emacs/2014-07/msg00935.html
I see that that boils down to a setting like this:

(setq display-buffer-alist 
      '(("\\*Async Shell Command\\*" . (display-buffer-no-window
      . ((allow-no-window . t))))))

So, I've made that setting, expecting that it means that the Async Shell
Command buffer will not appear.  But then, defining the following
function and running the snippet that follows gives me an error:

(defun sudo-shell-command (command)
  (interactive "MShell command (root): ")
    (with-temp-buffer
      (cd "/sudo::/")
      (async-shell-command command)))

(sudo-shell-command "touch /dev/null")

  byte-code: Wrong type argument: window-live-p, nil

...Is that really to be expected?

As a work-around: if I return to the default setting for
`display-buffer-alist' and define my function this way, there is
no error and, as desired, the buffer doesn't display:

(setq display-buffer-alist nil)

(defun sudo-shell-command (command)
  (interactive "MShell command (root): ")
  (save-window-excursion
    (with-temp-buffer
      (cd "/sudo::/")
      (async-shell-command command))))

(sudo-shell-command "touch /dev/null")

I get the message:

  nil: finished.

I might have expect to see:

  touch /dev/null: finished.

but at least there's no error!





In GNU Emacs 24.4.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2014-08-09 on Teacup
Repository revision: 117674 address@hidden
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:     Ubuntu 14.04.1 LTS

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GSETTINGS NOTIFY GNUTLS
LIBXML2 FREETYPE XFT ZLIB

Important settings:
  value of $LC_MONETARY: en_GB.UTF-8
  value of $LC_NUMERIC: en_GB.UTF-8
  value of $LC_TIME: en_GB.UTF-8
  value of $LANG: en_GB.UTF-8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
  shell-dirtrack-mode: t
  show-paren-mode: t
  tooltip-mode: t
  electric-indent-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
  column-number-mode: t
  line-number-mode: t

Recent input:
<return> C-x b * e w <tab> <return> g C-z M-> c d SPC 
. . <return> w h i c h <backspace> <backspace> <backspace> 
<backspace> <backspace> c d SPC s r c <return> e m 
a c s SPC - - v e r s i o n C-a . / C-e <return> M-x 
a b o u t <tab> <return> C-x C-b C-x <C-down-mouse-4> 
<C-mouse-4> o C-x o C-n C-n C-n <return> C-x b * e 
<tab> <return> g C-x b <return> M-< ; ; ; <return> 
<down-mouse-4> <mouse-4> <double-down-mouse-4> <double-mouse-4> 
<up> C-e SPC C-y <return> C-x 1 C-n C-n <up> <up> <up> 
C-SPC M-> M-w M-x r e p <tab> o <tab> r <tab> <return>

Recent messages:
nil: finished.
https://lists.gnu.org/archive/html/bug-gnu-emacs/2014-07/msg00935.html
Mark set
~/emacs 
~/emacs/src 
You can run the command `about-emacs' with C-h C-a
o is undefined
https://lists.gnu.org/archive/html/bug-gnu-emacs/2014-07/msg00935.html
Mark set [3 times]
Making completion list... [2 times]

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