Re: New customization option for killing processes without asking

[Philipp Stephani <p.stephani2@gmail.com>]

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Eli Zaretskii <eliz@gnu.org> schrieb am Di., 27. Sep. 2016 um 21:17 Uhr:

> > From: Philipp Stephani <p.stephani2@gmail.com>
> > Date: Tue, 27 Sep 2016 18:53:40 +0000
> >
> > there seem to be sufficiently many people annoyed by the "Active
> processes exist; kill them and exit anyway"
> > prompt (see e.g. http://stackoverflow.com/q/2706527/178761) that I
> created a new customization option to
> > make prompting optional. I've attached a patch, which I can push to
> master unless there are complaints.
>
> Fine with me, but I have 2 comments:
>
>   . Please add a NEWS entry and mention this in the 2 manuals.
>   . Please modify the test so that it doesn't invoke programs which
>     might not exist on non-Posix platforms; my obvious suggestion
>     would be to invoke a subordinate Emacs.
>
>
Done. I've attached a new patch.

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From c72742869b79f71b6a2fcc68641c785b0194fa0b Mon Sep 17 00:00:00 2001
From: Philipp Stephani <phst@google.com>
Date: Tue, 27 Sep 2016 20:47:23 +0200
Subject: [PATCH] Make querying to kill processes customizable

Introduce a new customization option, `confirm-kill-processes', that
users can set to nil if they don't want Emacs to nag them about killing
processes.

* lisp/files.el (confirm-kill-processes): New customization option.
(save-buffers-kill-emacs): Use customization option.

* test/lisp/files-tests.el
(files-test--save-buffers-kill-emacs--confirm-kill-processes): Add
test for new customization option.

* doc/emacs/entering.texi (Exiting): Document new user option.

* doc/lispref/processes.texi (Query Before Exit): Document new
user option.

* etc/NEWS: Document new user option.
---
 doc/emacs/entering.texi    |  5 +++++
 doc/lispref/processes.texi |  7 +++++++
 etc/NEWS                   |  7 +++++++
 lisp/files.el              | 14 +++++++++++++-
 test/lisp/files-tests.el   | 23 +++++++++++++++++++++++
 5 files changed, 55 insertions(+), 1 deletion(-)

diff --git a/doc/emacs/entering.texi b/doc/emacs/entering.texi
index 66817e3..09331e8 100644
--- a/doc/emacs/entering.texi
+++ b/doc/emacs/entering.texi
@@ -133,6 +133,11 @@ Exiting
 @code{confirm-kill-emacs} is the function @code{yes-or-no-p}.  The
 default value of @code{confirm-kill-emacs} is @code{nil}.
 
+@vindex confirm-kill-processes
+  If the value of the variable @code{confirm-kill-processes} is
+@code{nil}, @kbd{C-x C-c} does not ask for confirmation before killing
+subprocesses started by Emacs.  The value is @code{t} by default.
+
   To further customize what happens when Emacs is exiting, see
 @ref{Killing Emacs,,, elisp, The GNU Emacs Lisp Reference Manual}.
 
diff --git a/doc/lispref/processes.texi b/doc/lispref/processes.texi
index f9d5096..87c0b5c 100644
--- a/doc/lispref/processes.texi
+++ b/doc/lispref/processes.texi
@@ -1970,6 +1970,13 @@ Query Before Exit
 @end smallexample
 @end defun
 
+@defopt confirm-kill-processes
+If this user option is set to @code{t} (the default), then Emacs asks
+for confirmation before killing processes on exit.  If it is
+@code{nil}, Emacs kills processes without confirmation, i.e., the
+query flag of all processes is ignored.
+@end defopt
+
 @node System Processes
 @section Accessing Other Processes
 @cindex system processes
diff --git a/etc/NEWS b/etc/NEWS
index c3f4cf0..13814be 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -82,6 +82,13 @@ of a parenthetical grouping or string-delimiter: the default value nil
 keeps point at the end of the region, setting it to non-nil moves
 point to the beginning of the region.
 
++++
+** The new user option 'confirm-kill-processes' allows the user to
+skip a confirmation prompt for killing subprocesses when exiting
+Emacs.  When set to t (the default), Emacs will prompt for
+confirmation before killing subprocesses on exit, which is the same
+behavior as before.
+
 ---
 ** 'find-library-name' will now fall back on looking at 'load-history'
 to try to locate libraries that have been loaded with an explicit path
diff --git a/lisp/files.el b/lisp/files.el
index 4bd708d..f481b99 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -6757,11 +6757,22 @@ confirm-kill-emacs
   :group 'convenience
   :version "21.1")
 
+(defcustom confirm-kill-processes t
+  "Non-nil if Emacs should confirm killing processes on exit.
+If this variable is nil, the value of
+`process-query-on-exit-flag' is ignored.  Otherwise, if there are
+processes with a non-nil `process-query-on-exit-flag', Emacs will
+prompt the user before killing them."
+  :type 'boolean
+  :group 'convenience
+  :version "26.1")
+
 (defun save-buffers-kill-emacs (&optional arg)
   "Offer to save each buffer, then kill this Emacs process.
 With prefix ARG, silently save all file-visiting buffers without asking.
 If there are active processes where `process-query-on-exit-flag'
-returns non-nil, asks whether processes should be killed.
+returns non-nil and `confirm-kill-processes' is non-nil,
+asks whether processes should be killed.
 Runs the members of `kill-emacs-query-functions' in turn and stops
 if any returns nil.  If `confirm-kill-emacs' is non-nil, calls it."
   (interactive "P")
@@ -6776,6 +6787,7 @@ save-buffers-kill-emacs
                 (yes-or-no-p "Modified buffers exist; exit anyway? ")))
      (or (not (fboundp 'process-list))
          ;; process-list is not defined on MSDOS.
+         (not confirm-kill-processes)
          (let ((processes (process-list))
                active)
            (while processes
diff --git a/test/lisp/files-tests.el b/test/lisp/files-tests.el
index 479848a..80d5e5b 100644
--- a/test/lisp/files-tests.el
+++ b/test/lisp/files-tests.el
@@ -197,5 +197,28 @@ files-test-bug-18141-file
       (setenv "FOO" foo-env)
       (setenv "BAR" bar-env))))
 
+(ert-deftest files-test--save-buffers-kill-emacs--confirm-kill-processes ()
+  "Test that `save-buffers-kill-emacs' honors
+`confirm-kill-processes'."
+  (cl-letf* ((yes-or-no-p-prompts nil)
+             ((symbol-function #'yes-or-no-p)
+              (lambda (prompt)
+                (push prompt yes-or-no-p-prompts)
+                nil))
+             (kill-emacs-args nil)
+             ((symbol-function #'kill-emacs)
+              (lambda (&optional arg) (push arg kill-emacs-args)))
+             (process
+              (make-process
+               :name "sleep"
+               :command (list
+                         (expand-file-name invocation-name invocation-directory)
+                         "-batch" "-Q" "-eval" "(sleep-for 1000)")))
+             (confirm-kill-processes nil))
+    (save-buffers-kill-emacs)
+    (kill-process process)
+    (should-not yes-or-no-p-prompts)
+    (should (equal kill-emacs-args '(nil)))))
+
 (provide 'files-tests)
 ;;; files-tests.el ends here
-- 
2.10.0