Re: Too fine design granularity leads to numerous macro/function/command existed in Emacs.

[Emanuel Berg]

Hongyi Zhao wrote:

> It seems Emacs lisp don't have pipe at all.

You can do IPC with Emacs, see/try for example:

;;; -*- lexical-binding: t -*-
;;;
;;; this file:
;;;   http://user.it.uu.se/~embe8573/emacs-init/signal.el
;;;   https://dataswamp.org/~incal/emacs-init/signal.el

(defun signal-usr1-f ()
  (interactive)
  (message "got signal: USR1") )

(define-key special-event-map [sigusr1] #'signal-usr1-f)

;; test:
;;
;; from Emacs:  (signal-process (emacs-pid) 'sigusr1)
;;
;; from zsh: kill -s usr1 $(ps -e | grep emacs | cut -d " " -f 2)

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