bug#19495: 25.0.50; `message` -- optional argument to suppress echo area display

[Keith David Bershatsky]

As a feature request, the Emacs team may wish to consider adding an optional 
argument to the `message` function to permit suppression of the message being 
displayed in the echo area.

In my particular use case, there are certain process output strings that I 
prefer having printed to the `*Messages*` buffer -- instead of a dedicated 
process output buffer.

(defun rsync-process-filter (proc string)
  (when (not (or
      (string-match "files...\r" string)
      (string-match "files to consider\n" string)))
    (message "%s" string)))

The above example also displays in the echo area, which makes using interactive 
commands problematic while the ongoing process continues to print messages.  
Each time a new message is generated by the ongoing process, the interactive 
prompt and potential minibuffer completions get erased by the message -- e.g., 
`execute-extended-command` or `switch-to-buffer-other-window`.

The following is my workaround:

(defun rsync-process-filter (proc string)
  (let ((inhibit-read-only t))
    (when (not (or
        (string-match "files...\r" string)
        (string-match "files to consider\n" string)))
      (with-current-buffer (get-buffer-create "*Messages*")
        (goto-char (point-max))
        (insert string)))))

Here are links to a couple of threads regarding this issue:

http://superuser.com/questions/669701/emacs-disable-some-minibuffer-messages

http://emacs.stackexchange.com/questions/5959/send-process-output-to-messages-buffer-but-bypass-the-echo-area

Thanks,

Keith

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In GNU Emacs 25.0.50.1 (x86_64-apple-darwin10.8.0, NS appkit-1038.36 Version 
10.6.8 (Build 10K549))
 of 2014-10-01 on MP.local
Repository revision: 117996 dmantipov@yandex.ru-20141001132108-zdsxru2390mqyjlu
Windowing system distributor `Apple', version 10.3.1038
Configured using:
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Configured features:
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Important settings:
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Major mode: Fundamental

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Recent input:
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The default.
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