;;; w3m-tabmenu.el --- Functions for TAB menu browsing

;; Copyright (C) 2001 TSUCHIYA Masatoshi <tsuchiya@namazu.org>

;; Authors: Hideyuki SHIRAI    <shirai@meadowy.org>,
;;          TSUCHIYA Masatoshi <tsuchiya@namazu.org>
;; Keywords: w3m, WWW, hypermedia

;; This file is a part of emacs-w3m.

;; 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
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with this program; if not, you can either send email to this
;; program's maintainer or write to: The Free Software Foundation,
;; Inc.; 59 Temple Place, Suite 330; Boston, MA 02111-1307, USA.

;;; Commentary:

;; This file contains the functions for TAB browsing.  For more detail
;; about emacs-w3m, see:
;;
;;    http://emacs-w3m.namazu.org/

;;; Code:

(require 'w3m-util)
(require 'w3m)
(require 'easymenu)

(defvar w3m-tab-menubar-dummy
  '("TAB"
    ["dummy" w3m-switch-buffer t]))

(defun w3m-setup-tab-menu ()
  "Setup w3m tab menubar."
  (when w3m-use-tab-menubar
    (unless (lookup-key w3m-mode-map [menu-bar w3m-tab])
      (w3m-static-if (featurep 'xemacs)
	  (progn
	    (set-buffer-menubar (cons w3m-tab-menubar-dummy current-menubar))
	    (add-hook 'activate-menubar-hook 'w3m-tab-menubar-update))
	(define-key w3m-mode-map [menubar w3m-tab] w3m-tab-menubar-dummy)
	(add-hook 'menu-bar-update-hook 'w3m-tab-menubar-update)))))

(defun w3m-switch-buffer ()
  "Switch `w3m-mode' buffer in the current window."
  (interactive)
  (let ((items (w3m-tab-menubar-make-items 'nomenu))
	(minibuffer-setup-hook
	 (append minibuffer-setup-hook '(beginning-of-line)))
	(count 1)
	(form "%s [%s]")
	(completion-ignore-case t)
	comp hist histlen default buf)
    (dolist (item items)
      (when (nth 2 item)	;; current-buffer
	(setq default count))
      (setq comp (cons
		  (cons
		   (format form (nth 1 item) (nth 0 item)) (nth 0 item))
		  comp))
      (setq hist (cons (format form (nth 1 item) (nth 0 item)) hist))
      (setq count (1+ count)))
    (setq comp (nreverse comp))
    (setq histlen (length hist))
    (setq hist (append hist hist hist hist hist)) ;; STARTPOS at 3rd hist
    (setq buf
	  (completing-read
	   "Switch to w3m buffer: "
	   comp nil t (car (nth (1- default) comp))
	   (cons 'hist (+ (* 3 histlen) (- histlen default -1)))
	   (car (nth (1- default) comp))))
    (setq buf (cdr (assoc buf comp)))
    (when (get-buffer buf)
      (switch-to-buffer buf))))

(defun w3m-tab-menubar-open-item (buf)
  "Open w3m buffer from tab menubar."
  (interactive)
  (when (get-buffer buf)
    (switch-to-buffer buf)))

(defun w3m-tab-menubar-update ()
  "Update w3m tab menubar."
  (when (and (eq major-mode 'w3m-mode)
	     (w3m-static-if (featurep 'xemacs)
		 (frame-property (selected-frame) 'menubar-visible-p)
	       menu-bar-mode))
    (easy-menu-change nil
		      (car w3m-tab-menubar-dummy)
		      (w3m-tab-menubar-make-items))))

(defun w3m-tab-menubar-make-items (&optional nomenu)
  "Create w3m tab menu items."
  (let ((i 0) (current (current-buffer)) (title))
    (mapcar
     (lambda (buffer)
       (if nomenu
	   (list (buffer-name buffer)
		 (w3m-buffer-title buffer)
		 (eq buffer current))
	 (vector (format "%d: %s%s"
			 (incf i)
			 (if (eq buffer current) "* " "  ")
			 (w3m-buffer-title buffer))
		 `(w3m-tab-menubar-open-item ,(buffer-name buffer))
		 buffer)))
     (w3m-list-buffers))))

(provide 'w3m-tabmenu)

;;; w3m-tabmenu.el ends here