;;; url-tramp.el --- file-name-handler magic invoking Tramp for some protocols

;; Copyright (C) 2014-2016 Free Software Foundation, Inc.

;; Author: Michael Albinus <michael.albinus@gmx.de>
;; Keywords: comm, data, processes, hypermedia

;; 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;;; Code:

(require 'url-parse)
(require 'tramp)
(require 'password-cache)

;;;###autoload
(defcustom url-tramp-protocols '("ftp" "ssh" "scp" "rsync" "telnet")
  "List of URL protocols for which the work is handled by Tramp.
They must also be covered by `url-handler-regexp'."
  :group 'url
  :version "25.1"
  :type '(repeat string))

(defun url-tramp-convert-url-to-tramp (url)
  "Convert URL to a Tramp file name."
  (let ((obj (url-generic-parse-url (and (stringp url) url))))
    (if (member (url-type obj) url-tramp-protocols)
	(progn
	  (if (url-password obj)
	      (password-cache-add
	       (tramp-make-tramp-file-name
		(url-type obj) (url-user obj) (url-host obj) "")
	       (url-password obj))
	    (tramp-make-tramp-file-name
	     (url-type obj) (url-user obj) (url-host obj) (url-filename obj))))
      url)))

(defun url-tramp-convert-tramp-to-url (file)
  "Convert FILE, a Tramp file name, to a URL."
  (let ((obj (ignore-errors (tramp-dissect-file-name file))))
    (if (member (tramp-file-name-method obj) url-tramp-protocols)
	(url-recreate-url
	 (url-parse-make-urlobj
	  (tramp-file-name-method obj)
	  (tramp-file-name-user obj)
	  nil ; password.
	  (tramp-file-name-host obj)
	  nil ; port.
	  (tramp-file-name-localname obj)
	  nil nil t)) ; target attributes fullness.
      file)))

;;;###autoload
(defun url-tramp-file-handler (operation &rest args)
  "Function called from the `file-name-handler-alist' routines.
OPERATION is what needs to be done.  ARGS are the arguments that
would have been passed to OPERATION."
  (let ((default-directory (url-tramp-convert-url-to-tramp default-directory))
	(args (mapcar 'url-tramp-convert-url-to-tramp args)))
    (url-tramp-convert-tramp-to-url (apply operation args))))

(provide 'url-tramp)

;;; url-tramp.el ends here