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;;; tramp-ftp.el --- Tramp convenience functions for Ange-FTP -*- coding: iso-8859-1; -*-
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;; Copyright (C) 2002, 2003, 2004, 2005, 2006,
;;   2007 Free Software Foundation, Inc.
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;; Author: Michael Albinus <michael.albinus@gmx.de>
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;; Keywords: comm, processes

;; This file is part of GNU Emacs.

;; GNU Emacs 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.

;; GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
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;;; Commentary:

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;; Convenience functions for calling Ange-FTP from Tramp.
;; Most of them are displaced from tramp.el.
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;;; Code:

(require 'tramp)

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(eval-when-compile (require 'custom))
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;; Disable Ange-FTP from file-name-handler-alist.
;; To handle EFS, the following functions need to be dealt with:
;;
;; * dired-before-readin-hook contains efs-dired-before-readin
;; * file-name-handler-alist contains efs-file-handler-function
;;   and efs-root-handler-function and efs-sifn-handler-function
;; * find-file-hooks contains efs-set-buffer-mode
;;
;; But it won't happen for EFS since the XEmacs maintainers
;; don't want to use a unified filename syntax.
(defun tramp-disable-ange-ftp ()
  "Turn Ange-FTP off.
This is useful for unified remoting.  See
`tramp-file-name-structure-unified' and
`tramp-file-name-structure-separate' for details.  Requests suitable
for Ange-FTP will be forwarded to Ange-FTP.  Also see the variables
`tramp-ftp-method', `tramp-default-method', and
`tramp-default-method-alist'.

This function is not needed in Emacsen which include Tramp, but is
present for backward compatibility."
  (let ((a1 (rassq 'ange-ftp-hook-function file-name-handler-alist))
	(a2 (rassq 'ange-ftp-completion-hook-function file-name-handler-alist)))
    (setq file-name-handler-alist
	  (delete a1 (delete a2 file-name-handler-alist)))))
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(eval-after-load "ange-ftp"
  '(when (functionp 'tramp-disable-ange-ftp)
     (tramp-disable-ange-ftp)))

;;;###autoload
(defun tramp-ftp-enable-ange-ftp ()
  ;; The following code is commented out in Ange-FTP.

  ;;; This regexp takes care of real ange-ftp file names (with a slash
  ;;; and colon).
  ;;; Don't allow the host name to end in a period--some systems use /.:
  (or (assoc "^/[^/:]*[^/:.]:" file-name-handler-alist)
      (setq file-name-handler-alist
	    (cons '("^/[^/:]*[^/:.]:" . ange-ftp-hook-function)
		  file-name-handler-alist)))

  ;;; This regexp recognizes absolute filenames with only one component,
  ;;; for the sake of hostname completion.
  (or (assoc "^/[^/:]*\\'" file-name-handler-alist)
      (setq file-name-handler-alist
	    (cons '("^/[^/:]*\\'" . ange-ftp-completion-hook-function)
		  file-name-handler-alist)))

  ;;; This regexp recognizes absolute filenames with only one component
  ;;; on Windows, for the sake of hostname completion.
  (and (memq system-type '(ms-dos windows-nt))
       (or (assoc "^[a-zA-Z]:/[^/:]*\\'" file-name-handler-alist)
	   (setq file-name-handler-alist
		 (cons '("^[a-zA-Z]:/[^/:]*\\'" .
			 ange-ftp-completion-hook-function)
		       file-name-handler-alist)))))

(add-hook 'tramp-ftp-unload-hook 'tramp-ftp-enable-ange-ftp)
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;; Define FTP method ...
(defcustom tramp-ftp-method "ftp"
  "*When this method name is used, forward all calls to Ange-FTP."
  :group 'tramp
  :type 'string)

;; ... and add it to the method list.
(add-to-list 'tramp-methods (cons tramp-ftp-method nil))

;; Add some defaults for `tramp-default-method-alist'
(add-to-list 'tramp-default-method-alist
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	     (list "\\`ftp\\." "" tramp-ftp-method))
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(add-to-list 'tramp-default-method-alist
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	     (list "" "\\`\\(anonymous\\|ftp\\)\\'" tramp-ftp-method))
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;; Add completion function for FTP method.
(unless (memq system-type '(windows-nt))
  (tramp-set-completion-function
   tramp-ftp-method
   '((tramp-parse-netrc "~/.netrc"))))

(defun tramp-ftp-file-name-handler (operation &rest args)
  "Invoke the Ange-FTP handler for OPERATION.
First arg specifies the OPERATION, second arg is a list of arguments to
pass to the OPERATION."
  (save-match-data
    (or (boundp 'ange-ftp-name-format)
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	(require 'ange-ftp))
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    (let ((ange-ftp-name-format
	   (list (nth 0 tramp-file-name-structure)
		 (nth 3 tramp-file-name-structure)
		 (nth 2 tramp-file-name-structure)
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		 (nth 4 tramp-file-name-structure)))
	  ;; ange-ftp uses `ange-ftp-ftp-name-arg' and `ange-ftp-ftp-name-res'
	  ;; for optimization in `ange-ftp-ftp-name'. If Tramp wasn't active,
	  ;; there could be incorrect values from previous calls in case the
	  ;; "ftp" method is used in the Tramp file name. So we unset
	  ;; those values.
	  (ange-ftp-ftp-name-arg "")
	  (ange-ftp-ftp-name-res nil))
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      (cond
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       ;; If argument is a symlink, `file-directory-p' and `file-exists-p'
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       ;; call the traversed file recursively. So we cannot disable the
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       ;; file-name-handler this case.
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       ((memq operation '(file-directory-p file-exists-p))
	(apply 'ange-ftp-hook-function operation args))
	;; Normally, the handlers must be discarded
	(t (let* ((inhibit-file-name-handlers
		   (list 'tramp-file-name-handler
			 'tramp-completion-file-name-handler
			 (and (eq inhibit-file-name-operation operation)
			      inhibit-file-name-handlers)))
		  (inhibit-file-name-operation operation))
	     (apply 'ange-ftp-hook-function operation args)))))))
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(defun tramp-ftp-file-name-p (filename)
  "Check if it's a filename that should be forwarded to Ange-FTP."
  (let ((v (tramp-dissect-file-name filename)))
    (string=
     (tramp-find-method
      (tramp-file-name-multi-method v)
      (tramp-file-name-method v)
      (tramp-file-name-user v)
      (tramp-file-name-host v))
     tramp-ftp-method)))

(add-to-list 'tramp-foreign-file-name-handler-alist
	     (cons 'tramp-ftp-file-name-p 'tramp-ftp-file-name-handler))

(provide 'tramp-ftp)

;;; TODO:

;; * In case of "/ftp:host:file" this works only for functions which
;;   are defined in `tramp-file-name-handler-alist'.  Call has to be
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;;   pretended in `tramp-file-name-handler' otherwise.
;;   Furthermore, there are no backup files on FTP hosts.
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;;   Worth further investigations.
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;; * Map /multi:ssh:out@gate:ftp:kai@real.host:/path/to.file
;;   on Ange-FTP gateways.
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;;; arch-tag: 759fb338-5c63-4b99-bd36-b4d59db91cff
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;;; tramp-ftp.el ends here