[SOLVED] Re: [QUESTION] How to use :filter in `make-process'?

[stardiviner]

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Thanks Joost.

After reading the Info manual (even though the Info manual is not very 
friendly.)

I have following source code example which works great.

#+begin_src emacs-lisp
(shell-command "touch /tmp/tail.log")

(let ((proc (make-process
             :name "*tail log*"
             :command (list "tail" "-f" "/tmp/tail.log")
             :filter (lambda (proc output)
                       (message "append log captured")
                       (let ((p (get-process "*tail log*")))
                         (when (buffer-live-p (process-buffer p))
                           (with-current-buffer (process-buffer p)
                             (let ((moving (= (point) (process-mark proc))))
                               (save-excursion
                                 ;; Insert the text, advancing the process 
marker.
                                 (goto-char (process-mark proc))
                                 (insert output)
                                 (set-marker (process-mark proc) (point)))
                               (if moving (goto-char (process-mark proc))))))))
             :sentinel (lambda (proc event)
                         (message "done!"))
             :buffer "*tail log*")))
  (display-buffer "*tail log*"))
#+end_src

#+RESULTS[<2020-03-04 00:15:51> 9c0b6b462a594bd21b9d5579bd9a9254a3279e62]:
: #<window 183 on *info elisp*>

Then execute following command to append content into the log file:

#+begin_src sh
for N in {0..10}; do
  echo $N >> /tmp/tail.log
done
#+end_src


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[ stardiviner ]
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