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;;;; remote.jl -- Remote file access
;;; Copyright (C) 1998 John Harper <john@dcs.warwick.ac.uk>
;;; $Id: remote.jl,v 1.8 1999/07/06 13:21:22 john Exp $
;;; This file is part of Jade.
;;; Jade 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.
;;; Jade 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 Jade; see the file COPYING. If not, write to
;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
(provide 'remote)
;; Configuration
;; A symbol defines a backend type if its `remote-backend' property
;; is a function to call as (FUNCTION SPLIT-NAME-OR-NIL OP ARG-LIST)
(defvar remote-auto-backend-alist nil
"An alist of (HOST-REGEXP . BACKEND-TYPE) defining how remote files are
accessed on specific hosts.")
(defvar remote-default-backend 'ftp
"Backend used for otherwise unspecified hosts.")
(defvar remote-host-user-alist nil
"Alist of (HOST-REGEXP . USER-NAME) matching host names to usernames.
Only used when no username is given in a filename.")
(defvar remote-default-user (user-login-name)
"Default username to use for file-transfer when none is specified, either
explicitly, or by the remote-ftp-host-user-alist variable.")
;; Remote filename syntax
(defvar remote-file-regexp "^/(([a-zA-Z0-9._-]+)@)?([a-zA-Z0-9._-]+):")
;; Entry point
;;;###autoload
(defun remote-file-handler (op &rest args)
(cond
((filep (car args))
;; A previously opened file handle. The backend should have stashed
;; it's handler function in the first slot the file's handler-data
;; (a vector)
(let
((split (remote-split-filename (file-binding (car args)))))
(funcall (aref (file-handler-data (car args)) 0) split op args)))
((eq op 'file-name-absolute-p)) ;remote files are absolute?
((eq op 'local-file-name)
;; can't get a local file name
nil)
(t
(let
;; Chop up the file name
((split (remote-split-filename (if (eq op 'copy-file-from-local-fs)
;; remote file is 2nd arg
(nth 1 args)
(car args)))))
(cond
;; Handle all file name manipulations
;; XXX This isn't such a good idea since it presumes that remote
;; XXX systems use the same file naming conventions as locally.
((eq op 'expand-file-name)
(remote-join-filename (car split) (nth 1 split)
(expand-file-name (nth 2 split) ".")))
((eq op 'file-name-nondirectory)
(file-name-nondirectory (nth 2 split)))
((eq op 'file-name-directory)
(remote-join-filename (car split) (nth 1 split)
(file-name-directory (nth 2 split))))
((eq op 'file-name-as-directory)
(remote-join-filename (car split) (nth 1 split)
(if (string= (nth 2 split) "")
""
(file-name-as-directory (nth 2 split)))))
((eq op 'directory-file-name)
(remote-join-filename (car split) (nth 1 split)
(directory-file-name (nth 2 split))))
(t
;; Anything else, pass off to a backend
(let
((backend (get (or (cdr (assoc-regexp (nth 1 split)
remote-auto-backend-alist t))
remote-default-backend)
'remote-backend)))
(funcall backend split op args))))))))
(defun remote-get-user (host)
(or (cdr (assoc-regexp host remote-host-user-alist)) remote-default-user))
;; Return (USER-OR-NIL HOST FILE)
(defun remote-split-filename (filename)
(unless (string-match remote-file-regexp filename)
(error "Malformed remote file specification: %s" filename))
(let
((host (substring filename (match-start 3) (match-end 3)))
(file (substring filename (match-end))))
(list
(and (match-start 2)
(substring filename (match-start 2) (match-end 2)))
host file)))
;; Create a remote file name. USER may be nil
(defun remote-join-filename (user host file)
(concat ?/ (and user (concat user ?@)) host ?: file))
;; Initialise handler
;;;###autoload (setq file-handler-alist (cons '("^/(([a-zA-Z0-9._-]+)@)?([a-zA-Z0-9._-]+):" . remote-file-handler) file-handler-alist))
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