This is for use with kdrill.

(defun sacha/kanji/get-ordered-kanji-list ()
  (let (kanji-list)
    (while (not (eobp))
      (let ((c (char-after (point))))
        (cond
         ((= c ?\"))
         ((= c ?\n))
         ((= c ?:) (forward-line 1) (forward-char -1))
         (t (add-to-list 'kanji-list c))))
      (forward-char 1))
    kanji-list))

(defun sacha/kanji/ordered-usefile-to-kill ()
  (interactive)
  ;; Look up kanji in kanjidic
  (let ((list (sacha/kanji/get-ordered-kanji-list)))
    (kill-new
     (with-current-buffer (find-file-noselect "/usr/share/edict/kanjidic")
       (mapconcat
        (lambda (kanji)
          (goto-char (point-min))
          (when (search-forward (char-to-string kanji) nil t)
            (skip-syntax-forward " ")
            (buffer-substring-no-properties (point) (and (skip-syntax-forward "^ ") (point)))))
        list
        "\n")))))