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(defun ft-get-erc-buffers-of-mode (mode)
  "Return list of buffer where major-mode is MODE"
  (let ((result))
	(dolist (item (buffer-list))
	  (with-current-buffer item
		(when (string= major-mode mode)
		  (push (buffer-name item) result))))
	result))

(defvar consult--source-erc-buffers
  `(:name     "IRC"
    :narrow   ?i
    :category buffer
    :face     consult-buffer
 	:action   ,#'consult--buffer-action
    :state    ,#'consult--buffer-state
    :history  buffer-name-history
    :items ,(lambda () (ft-get-erc-buffers-of-mode "erc-mode")))
  "consult source for IRC buffers")

(add-to-list 'consult-buffer-sources 'consult--source-erc-buffers 'append)