eldoc_setup.el

;; print immediately but only after certain commands
(setq eldoc-idle-delay 0)
(setq eldoc-print-after-edit t)

(add-hook 'eldoc-mode-hook
          (defun eldoc--add-commands+ ()
            ;; remove any preloaded commands
            (setq eldoc-message-commands
                  (make-vector eldoc-message-commands-table-size 0))
            (eldoc-add-command 'eldoc-show-help+)))

(advice-add 'self-insert-command :after
            (defun eldoc-after-space+ (&rest _)
              (when (and (eq last-input-event ?\s)
                         (not (in-string-or-comment+)))
                (setq this-command 'eldoc-show-help+))))

(advice-add 'electric-pair--insert :after #'eldoc-show-help+)

(global-set-key (kbd "S-SPC")
                 (defun eldoc-show-help+ (&rest _)
                   (interactive)
                   (setq this-command 'eldoc-show-help+)))

;; helpers

(defsubst in-string-p+ (&optional pos)
  (in-ppss-p+ 'string pos))

(defsubst in-comment-p+ (&optional pos)
  (in-ppss-p+ 'comment pos))

(defun in-string-or-comment+ (&optional pos)
  (or (in-string-p+ pos)
      (in-comment-p+ pos)))

(defun in-ppss-p+ (type &optional pos)
  "Type is comment or string"
  (let* ((ppss (syntax-ppss pos))
         (beg nil)
         (reg (cond ((and (eq type 'string)
                          (setq beg (nth 8 ppss)))
                     (cons beg (nth 3 ppss)))
                    ((and (eq type 'comment)
                          (nth 4 ppss)
                          (setq beg (nth 8 ppss)))
                     (cons beg
                           (save-excursion
                             (goto-char beg)
                             (forward-comment 1)
                             (point)))))))
    reg))