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;;; tramp-ftp.el --- Tramp convenience functions for Ange-FTP and EFS -*- coding: iso-8859-1; -*-
;; Copyright (C) 2002, 2003 Free Software Foundation, Inc.
;; Author: Michael Albinus <Michael.Albinus@alcatel.de>
;; 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
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; Convenience functions for calling Ange-FTP (and maybe EFS, later on)
;; from Tramp. Most of them are displaced from tramp.el.
;;; Code:
(require 'tramp)
(eval-when-compile
(require 'cl)
(require 'custom)
;; Emacs 19.34 compatibility hack -- is this needed?
(or (>= emacs-major-version 20)
(load "cl-seq")))
;; 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)))))
(tramp-disable-ange-ftp)
(eval-after-load "ange-ftp" '(tramp-disable-ange-ftp))
;; 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
(list "\\`ftp\\." "" tramp-ftp-method))
(add-to-list 'tramp-default-method-alist
(list "" "\\`\\(anonymous\\|ftp\\)\\'" tramp-ftp-method))
;; 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)
(require 'ange-ftp))
(let ((ange-ftp-name-format
(list (nth 0 tramp-file-name-structure)
(nth 3 tramp-file-name-structure)
(nth 2 tramp-file-name-structure)
(nth 4 tramp-file-name-structure))))
(cond
;; If argument is a symlink, 'file-directory-p` and 'file-exists-p`
;; call the traversed file recursively. So we cannot disable the
;; file-name-handler this case.
((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)))))))
(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
;; pretended in `tramp-file-name-handler' otherwise.
;; Furthermore, there are no backup files on FTP hosts.
;; Worth further investigations.
;;; tramp-ftp.el ends here
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