Re: How to detect two emacs process in Elisp code?

[Emanuel Berg via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

stardiviner wrote:

> I load desktop-save-mode session in init.el.
> But when using "bug-hunter-init-file", I need to
> exclude this session init file.
>
> Here is my try:
>
> #+begin_src emacs-lisp
> ;;; detect external system has Emacs process running?
> ;;; If yes, like `bug-hunter' is running. Then don't load session.
> ;;; FIXME
> (let ((emacs-processes
>        (length (mapcar
>                 'string-to-number
>                 (seq-filter
>                  (lambda (str)
>                    (not (string-empty-p str)))
>                  (split-string
>                   ;; (shell-command-to-string "ps -C emacs -o pid=")
>                   (shell-command-to-string "ps -C emacs -o pid=")
>                   "\n"))))))
>   (when (<= emacs-processes 1)
>     (message "init-emacs-session loading")
>     (require 'init-emacs-session)))
> #+end_src

Try this:

(require 'seq)
(defun how-many-emacs ()
  (let ((emacs-processes
         (length (mapcar
                  #'string-to-number
                  (seq-filter
                   (lambda (str)
                     (not (string-empty-p str)) )
                   (split-string
                    (shell-command-to-string "ps -C emacs -o pid=")
                    "\n") )))))
    (message (format "Emacs process: %d" emacs-processes)) ))
;; (how-many-emacs) ; 1

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