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bug#18133: Suppressing asynchronous command output


From: Reuben Thomas
Subject: bug#18133: Suppressing asynchronous command output
Date: Fri, 23 Dec 2016 21:07:37 +0000

On 23 December 2016 at 19:55, martin rudalics <address@hidden> wrote:
​​

Isn't this much more than changing the way ‘display-buffer’ behaves?
IIUC, you want the buffer to pop up whenever some output arrives, the
user should be allowed to delete the window, and when new output arrives
the buffer should pop up again.  Correct?

Here is the implementation I currently use (from Juri Linkov, message #8, second block of code):

(advice-add 'comint-output-filter :after
            "Stop Async Shell Command output from appearing until there is output."
            (lambda (process string)
              (when (and (string-match-p "\\*Async Shell Command\\*"
                                         (buffer-name (process-buffer process))))
                (display-buffer (process-buffer process)))))

I think this does what you say: whenever some output arrives, the buffer pops up. It does not involve changing the behaviour of display-buffer.

All my patch does is move the advice into a function suitable for comint-output-filter-functions.

But I'm still confused by how you
want to add something to ‘display-buffer-alist’ and at the same time to
not change the behavior of ‘display-buffer’ ;-)

I suggested adding an option to display-buffer-alist's defcustom specification, something like:

                :options (((regexp "\\*Async Shell Command\\*") (function display-buffer-no-window)))

By default, this is not selected, so it does not change the default behaviour.

I currently simply add an item to display-buffer-alist:

(add-to-list 'display-buffer-alist '("\\*Async Shell Command\\*"
                                     display-buffer-no-window))

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