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Re: How to run shell command with stream input, to get string output


From: Jean Louis
Subject: Re: How to run shell command with stream input, to get string output
Date: Mon, 1 Jul 2019 14:15:42 +0200
User-agent: Mutt/1.10.1 (2018-07-13)

* Noam Postavsky <address@hidden> [2019-07-01 13:13]:
> On Mon, 1 Jul 2019 at 05:45, Jean Louis <bugs@gnu.support> wrote:
> 
> > Something like that, but it does not work as
> > output of process is not written in the buffer.
> 
> When input is not newline terminated, cat requires two EOFs. I find
> this is the case when running outside of Emacs as well.
>

Excellent! Thank you.

I see it can work as below, and even markdown needs two times EOF.

(with-temp-buffer
  (let* ((process (make-process :name "NEW" 
                                :buffer (current-buffer)
                                :command '("markdown")
                                :sentinel #'ignore)))
    (process-send-string process "Hello\n============")
    (process-send-eof process)
    (process-send-eof process)
    (while (accept-process-output process))
    (buffer-string)))

Maybe process-send-eof is making sure of one blank line on the end, as this 
works without 2 EOF:

(with-temp-buffer
  (let* ((process (make-process :name "NEW" 
                                :buffer (current-buffer)
                                :command '("markdown")
                                :sentinel #'ignore)))
    (process-send-string process "Hello\n============\n")
    (process-send-eof process)
    (while (accept-process-output process))
    (buffer-string)))

And this works too with proj software to convert coordinates, so I will use 
your example.

(with-temp-buffer
  (let* ((process (start-process "NEW" (current-buffer) "cs2cs" "-f" "%.5f" 
"Arc 1960" "WGS84")))
    (set-process-sentinel process #'ignore)
    (process-send-string process "-1.47666 34.56861")
    (process-send-eof process)
    (while (accept-process-output process))
    (buffer-string)))


Thank you,
Jean



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