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gnu.emacs.sources で以下のような記事を見つけました.ざっと見た感じでは,
C-cC-s (= w3m-select-buffers) を知らずに実装しているのでは? という印象
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This file was post by author's request.

Ivan Boldyrev

                                                  Is 'morning' a gerund?

;;; wl-list.el --- List all W3M buffers.

;; Copyright (C) 2003 by Free Software Foundation, Inc.

;; Author: Zajcev Evgeny <zevlg@yandex.ru>
;; Maintainer: none, mail me if you want to maintain this code.
;; Created: Thu Nov 20 12:58:50 MSK 2003
;; Keywords: w3m, hypermedia
;; X-CVS: $Id$

;; This file is NOT part of XEmacs.

;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 2, or (at
;; your option) any later version.

;; This program is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with XEmacs; see the file COPYING.  If not, write to the Free
;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
;; 02111-1307, USA.

;;; Synched up with: Not in FSF

;;; Commentary:
;; For quickly switching between numerous W3M buffers.

;; Start with M-x wl-show-list RET

;;; Code:

(defvar wl-mode-hooks nil
  "Hooks called when entering w3m list mode.")

(defvar wl-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map (kbd "q") 'wl-quit)
    (define-key map (kbd "n") 'wl-next)
    (define-key map (kbd "p") 'wl-prev)
    (define-key map (kbd "SPC") 'scroll-up)
    (define-key map (kbd "DEL") 'scroll-down)
    (define-key map (kbd "<") 'beginning-of-buffer)
    (define-key map (kbd ">") 'end-of-buffer)
    (define-key map (kbd "s") 'isearch-forward)
    (define-key map (kbd "r") 'isearch-backward)
    (define-key map (kbd "h") 'describe-mode)
    (define-key map (kbd "TAB") 'wl-next)
    (define-key map (kbd "RET") 'wl-switch-to)
  "Keymap used in W3M list mode.")

(defun wl-mode ()
  "Major mode for listing active W3M windows.

  (use-local-map wl-mode-map)
  (setq major-mode 'wl-mode
	mode-name "W3M-List*"
	buffer-read-only t)
  (set-buffer-modified-p nil)
  (run-hooks 'wl-mode-hooks))

(defun wl-show-list ()
  "Show w3m buffers."

  (pop-to-buffer "*W3M List*" t)

  (setq buffer-read-only nil)

  (insert "W3M active sessions list:\n\n")

    (let ((bufs (buffer-list))
	  (inscol nil))
      (while bufs
	;; XXX
	(when (string-match "\\*w3m\\*\\|\\*w3m\\*<[0-9]+>" (buffer-name (car bufs)))
	  (insert (format "%-8s - " (buffer-name (car bufs))))
	  (setq inscol (current-column))
	  (add-text-properties (point-at-bol) (point) (list 'w3m-buffer (car bufs)))
	  ;; Insert Title
	  (insert (format "%-7s" "Title: "))
	  (insert-face (w3m-buffer-title (car bufs)) 'w3m-header-line-location-title-face)
	  (insert "\n")

	  ;; Insert Url
	  (move-to-column inscol t)
	  (insert (format "%-7s" "Url: "))
	  (insert-face (with-current-buffer (car bufs) w3m-current-url)
	  (insert "\n\n"))
	(setq bufs (cdr bufs)))))


;;; Commands
(defun wl-quit ()
  "Quit `wl-mode'."

(defun wl-get-buffer ()
  "Get w3m-buffer property at point."
  (get-text-property (point) 'w3m-buffer))

(defun wl-next (&optional n)
  "Jump to next N w3m buffer."
  (interactive "p")

  (let* ((nd t)
	 (fbuf (wl-get-buffer))
	 (buf fbuf)

      (while (and nd (if (> n 0) (not (eobp)) (not (bobp))))
	(if (> n 0)
	    (forward-char 1)
	  (backward-char 1))
	(setq buf (wl-get-buffer))
	(when (and (not (null buf)) (not (eq buf fbuf)))
	    (setq pnt (point))
	    (setq nd nil)))))

    (when (null nd)
      (goto-char pnt)

(defun wl-prev (&optional n)
  "Jump to previous N w3m buffer."
  (interactive "p")
  (wl-next (- 0 n)))

(defun wl-switch-to ()
  "Switch to w3m-buffer at point."

  (let ((bufs (buffer-list))
	(buf (wl-get-buffer))
	(founded nil))
    (if buf
	  (while bufs
	    (if (eq buf (car bufs))
		  (setq founded t)
		  (setq bufs nil))
	      (setq bufs (cdr bufs))))

	  (if founded
		(switch-to-buffer buf))
	    (message "Buffer not found in buffer-list")))

	(message "Not w3m-buffer property at point")

(provide 'wl-list)

;;; wl-list.el ends here
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土屋 雅稔 ( TSUCHIYA Masatoshi )