Quick modification to ob-spice.el from Tiago Weber

ob-spice.el

(defun org-babel-execute:spice (body params)
  "Execute BODY with specified PARAMS."
  (let ((body (org-babel-expand-body:spice body params))
      (vars (mapcar #'cdr (org-babel-get-header params :var)))
      textfile
      imagefile
      raw
      result)
    (org-babel-eval "ngspice " body)
    (mapc (lambda (pair)
         (when (string= (car pair) "file")
           (setq textfile (concat (cdr pair) ""))
           (setq imagefile (concat (cdr pair) ".png"))))
       vars)
    (when (file-readable-p textfile)
        (progn
          (setq raw (with-temp-buffer (insert-file-contents textfile) (buffer-string)))
          (setq raw (replace-regexp-in-string "\n" "" raw))
          (setq result (split-string raw ","))))
    (when (file-readable-p imagefile)
      (add-to-list 'result (concat '"[[file:./" imagefile "]]") t))
      result))