More than two choices in query

More than two choices in query

[Chetan Pandya]

There was a question some time back if there is a way to query with more than two choices (y/n). Was there a resolution of that question or everyone who needs something like that is supposed to implement their own solution?

I start firefox with browse-url. When I try to exit emacs, it shows me active process and gives me two choices, either don't exit emacs or kill emacs and take down firefox as well. What I would like is something like "abort, retry, ignore" so that it can keep firefox running and still exit emacs. sometime C-g in a query can do what you want, but when trying to kill emacs, it is more often the wrong thing to happen.

-Chetan

Re: More than two choices in query

[Stefan Monnier]

> There was a question some time back if there is a way to query with
> more than two choices (y/n).  Was there a resolution of that question
> or everyone who needs something like that is supposed to implement
> their own solution?

There's still no predefined function for that, AFAIK.

> I start firefox with browse-url. When I try to exit Emacs, it shows me
> active process and gives me two choices, either don't exit Emacs or
> kill Emacs and take down firefox as well.

IIUC the problem here is not really the prompt but the fact that the
C code of Emacs does not offer any way to exit Emacs without killing the
subprocesses (no way to "detach" from them).  If this were possible
a simple y/n prompt would still be sufficient, where "y" means "kill the
process", "n" means "don't kill but exit nevertheless" and C-g would
mean "don't exit".


        Stefan

Re: More than two choices in query

[Chetan Pandya]

[-- Attachment #1: Type: text/plain, Size: 1185 bytes --]

From: Stefan Monnier <monnier@iro.umontreal.ca>


>> There was a question some time back if there is a way to query with
>> more than two choices (y/n).  Was there a resolution of that question
>> or everyone who needs something like that is supposed to implement
>> their own solution?

> There's still no predefined function for that, AFAIK.

>> I start firefox with browse-url. When I try to exit Emacs, it shows me
>> active process and gives me two choices, either don't exit Emacs or
>> kill Emacs and take down firefox as well.

> IIUC the problem here is not really the prompt but the fact that the
> C code of Emacs does not offer any way to exit Emacs without killing the
> subprocesses (no way to "detach" from them).  If this were possible
> a simple y/n prompt would still be sufficient, where "y" means "kill the
> process", "n" means "don't kill but exit nevertheless" and C-g would
> mean "don't exit".

>        Stefan

Here is a patch to proess.c:kill_buffer_processes that does not kill processes 
not associated with a buffer.

However, this still gives a message there are active processes kill them?
If the answer is y, the firefox process is not killed.

Chetan

[-- Attachment #2: patch --]
[-- Type: application/octet-stream, Size: 793 bytes --]

--- process.c	29 Jan 2009 14:34:38 -0000	1.579
+++ process.c	7 Feb 2009 19:39:28 -0000
@@ -6481,7 +6481,8 @@
 }
 
 /* Kill all processes associated with `buffer'.
-   If `buffer' is nil, kill all processes  */
+   If `buffer' is nil, kill all processes associated with a buffer.
+   If buffer it Qt, kill all processes. */
 
 void
 kill_buffer_processes (buffer)
@@ -6493,7 +6494,9 @@
     {
       proc = XCDR (XCAR (tail));
       if (PROCESSP (proc)
-	  && (NILP (buffer) || EQ (XPROCESS (proc)->buffer, buffer)))
+	  && ((NILP(buffer) && !NILP (XPROCESS (proc)->buffer))
+              || (!NILP(buffer) && EQ (XPROCESS (proc)->buffer, buffer))
+              || (EQ (buffer, Qt))))
 	{
 	  if (NETCONN_P (proc) || SERIALCONN_P (proc))
 	    Fdelete_process (proc);

Re: More than two choices in query

[Geoff Gole]

> There was a question some time back if there is a way to query with more than two choices (y/n). Was there a resolution of that question or everyone who needs something like that is supposed to implement their own solution?
>

I've done this by passing a list of one object to map-y-or-n-p and
making use of the action-alist parameter. That will still present one
yes/no question to the user, but they can take more than two actions.

Re: More than two choices in query

[Stefan Monnier]

> Here is a patch to proess.c:kill_buffer_processes that does not kill
> processes not associated with a buffer.

I think we'll want some such change, but it should wait for 23.2.

> However, this still gives a message there are active processes kill them?
> If the answer is y, the firefox process is not killed.

The code will need to be adjusted there, obviously.


        Stefan