I found a way to combine `eldoc-mode' and `show-smartparens-mode' well in minibuffer.

[linux40]

I submit this issue to hope author would not reconstruct the features I use so I could save my time, and to help other people who want to see current match while eldoc-mode override the message.

Feel free to share it anywhere.

;; -*- lexical-binding: t -*-

(let (match-message position-changed)
  (advice-add 'sp-show--pair-echo-match :filter-args
              (lambda (match-positions)
                (setq position-changed
                      (not (and (equal sp-show-pair-previous-point (point))
                                (equal sp-show-pair-previous-match-positions
                                       match-positions))))
                match-positions))
  (advice-add 'sp-show--pair-echo-match :filter-return
              (lambda (message)
                (when position-changed (setq match-message message))))
  (advice-add 'sp-show--pair-delete-overlays :before
              (lambda (&rest _rest) (setq match-message nil)))
  (advice-add 'eldoc-minibuffer-message :filter-args
              (lambda (args)
                (if (or (not (stringp match-message))
                        (string-blank-p match-message)
                        (minibufferp))
                    args
                  (let ((format (car args)) (rest (cdr args)))
                    (if (string-blank-p (apply 'message format rest))
                        `(,match-message)
                      (cons (concat match-message " | " format) rest)))))))

[Fuco1]

Really cool! Do you think we could maybe integrate this into the package itself? Maybe it could automatically detect you have eldoc active and then enable the advices.

[linux40]

Of course you can. And you can even do better. Firstly you should have better understanding about the situation show-smartparens-mode will show something in minibuffer. Then you can even give user the choose about the content to display when both eldoc-mode and show-smartparens-mode want to occupy the minibuffer. My window-width is long enough so I want to display them all but some people may just want to see one of them.

Notice that eldoc-mode often shows a blank string in minibuffer, so string-blank-p should be used to check if eldoc-mode has some messages to show actually.