Editing Emacs buffer with external editor

[Jean Louis <bugs@gnu.support>]

For those people who wish edit Emacs buffers with external editor
within Emacs editing session:

(defcustom rcd-external-editor "notepadqq"
  "The external editor as an option for some functions"
  :group 'rcd
  :type 'string)

(defun rcd-edit-with-external-editor (&optional text)
  "Editing with external editor as defined in `rcd-external-editor'.

It will either edit the optional TEXT as string
argument. Otherwise it will edit the current buffer and replace
it with the result."
  (interactive)
  (let* ((buffer-or-text (if text nil t))
	 (text (if buffer-or-text (buffer-substring-no-properties (point-min) (point-max)) text))
	 (point (point))
	 ;; (mode major-mode)
	 (file (concat (or (getenv "TMPDIR") "/tmp/") "temp-file")))
    (string-to-file-force text file)
    (call-process rcd-external-editor nil nil nil file)
    (if buffer-or-text 
	(progn
	  (erase-buffer)
	  (insert (file-to-string file))
	  (goto-char point))
      (file-to-string file))))




Jean

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