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• Buffer::goto_char (Point &point, point_t goal) const
• point 現在位置
• goal 目標位置
• b_contents.p1 (point-min)相当
• b_contents.p2 (point-max)相当
• b_nchars バッファのサイズ

現在位置と前と後ろと目標位置との関係を調べて、近いほうから進む？

• Buffer::forward_char (Point &point, long nchars) const
• point 現在位置
• nchars 進む数
• b_contents.p1 (point-min)相当
• b_contents.p2 (point-max)相当
• d 実際の移動

interactive指定子を作っちゃえば楽に置き換えられるんじゃね？
ってことで、こんな。

(in-package "editor")
(defun interactive-read-string-with-escape-sequence (prompt default history title)
  (list (decode-escape-sequence (read-string prompt :default default :history history) nil)))
(pushnew '(#\w . interactive-read-string-with-escape-sequence)
	 *interactive-specifier-alist* :test #'equal)
(defun interactive-read-regexp-with-escape-sequence (prompt default history title)
  (list (decode-escape-sequence (read-string prompt :default default :history history) t)))
(pushnew '(#\W . interactive-read-regexp-with-escape-sequence)
	 *interactive-specifier-alist* :test #'equal)

;; こんな感じで使う
;; 文字列
(defun search-forward-wes (pattern &optional noerror)
  (interactive "wSearch forward: "
    :default0 *last-search-string* :history0 'search)
  (search-command pattern nil nil (interactive-p) noerror))
;; 正規表現
(defun re-search-forward-wes (regexp &optional noerror)
  (interactive "WRe-search forward: "
    :default0 *last-search-regexp* :history0 'search)
  (search-command regexp nil t (interactive-p) noerror))
(export '(search-forward-wes re-search-forward-wes))
(in-package "user")

[[(ReadMore...) index.rb?1174689340.txt]]

とりあえずこんなところか。
主だったところはsession.lから。
outline-tree2をバッファバーの代わりにしつつ、rename-bufferを良く使う人向け。
もしくは*compilation*バッファとかでうっかりそのまま編集して、undoができず残念な思いをする人向け。

(defun clone-buffer (buffer-name &optional (buffer (selected-buffer)))
  (interactive "sClone Buffer: ")
  (let ((major buffer-mode)
        (minor (mapcan #'(lambda (mode)
                           (let ((var (and (consp mode) (car mode))))
                             (and (symbolp var)
                                  (boundp var)
                                  (symbol-value var)
                                  (list var))))
                       *minor-mode-alist*))
        (locals (mapcar #'(lambda (var)
                            (and (symbolp var)
                                 (local-variable-p var)
                                 (cons var (symbol-value var))))
                        *buffer-info-variable-list*))
        (point (point)))
    (set-buffer (create-new-buffer buffer-name))
    (insert-buffer buffer)
    (funcall major)
    (mapc #'(lambda (f) (and (fboundp f) (funcall f))) minor)
    (mapc #'(lambda (x)
              (when (and (car x) (symbolp (car x)))
                (make-local-variable (car x))
                (set (car x) (cdr x))))
          locals)
    (goto-char point)))

メモ:
undo情報をそっくり写せるとうれしいかも。
[[(ReadMore...) index.rb?1161833288.txt]]

oniguruma/index.html

その２。
対象が文字列ならなんとかなるでしょ。
気がかりは文字コード。
バッファを対象にするのは内部コードとの絡みがあるから厳しいだろうな。

http://xyzzy.s53.xrea.com/wiki/index.php?tips%2F%A5%D0%A5%C3%A5%D5%A5%A1%A5%D0%A1%BC%A4%CE%CA%C2%A4%D3%BD%E7%A4%F2%CA%D1%A4%A8%A4%EB
(2006-04-12)