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Re: PROPOSAL: Control over process cleanup in `save-buffers-kill-emacs'.

From: Davis Herring
Subject: Re: PROPOSAL: Control over process cleanup in `save-buffers-kill-emacs'.
Date: Fri, 22 Sep 2017 13:11:07 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0

This means that neither `kill-emacs-query-functions' nor `kill-emacs-hook' 
happen in time to offer any fine-grained control over whether the user gets 
queried about active processes.  And since the `confirm-kill-processes' flag 
applies to all processes, one can't use it to customize *which* processes one 
is queried about at exit time.

I propose moving `kill-emacs-query-functions' to before the process-killing 
block, so that hooks can do things with processes before Emacs asks about those 

Given your use case, it seems a lot less hackish to just introduce a user option that is one of

1. an abnormal hook called with each new process started

This would allow the use of `set-process-query-on-exit-flag' in a natural way, but would run before any existing code configured the process in similar fashion.

2. a new normal hook called at the beginning of `save-buffers-kill-emacs'

This would also allow the existing flag to be used, and would be unsurprising and easy to find.

3. a regular expression matching process and/or process-buffer names for which not to query on exit

This would allow access by non-programmers, but would make the query flag something of a lie.


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