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;;; trampcache.el --- file information caching for tramp
;; Copyright (C) 2000 by Free Software Foundation, Inc.
;; Author: Daniel Pittman <daniel@inanna.danann.net>
;; 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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; An implementation of file information caching for remote files.
;; Each connection (host, user) has a unique cache.
;; Each file has a unique set of properties associated with it.
;;; Code:
;; The internal interface to the cache system.
(defun tramp-cache-set (file key value)
"Within the current tramp cache, set the property KEY to VALUE,
for FILE.
This must be run with the current cache context set."
;; do we have an entry for the file?
(let* ((info (or (assoc file tramp-cache-data)
(assoc file (setq tramp-cache-data
(cons (list file (cons nil nil)) tramp-cache-data)))))
(prop (or (assoc key (cdr info))
(assoc key (setcdr info
(cons (cons key nil) (cdr info)))))))
(setcdr prop value)))
(defun tramp-cache-get (file key)
"Within the current tramp cache, return the property KEY of FILE."
(cdr-safe (assoc key (cdr-safe (assoc file tramp-cache-data)))))
;; The public interface to the cache system.
(defun tramp-cache-setup (multi method user host)
"Initialise the cache system for a new tramp connection."
(with-current-buffer (tramp-get-buffer multi method user host)
(set (make-local-variable 'tramp-cached-data) nil)))
;; REVISIT: These should only key on (user . host), not the method.
;; --daniel@danann.net, 2000-06-01
(defun tramp-cache-get-file-property (file key multi method user host)
"Get the property KEY of FILE from the cache context of the
user USER on the remote machine HOST."
(with-current-buffer (tramp-get-buffer multi method user host)
(tramp-cache-get file key)))
(defun tramp-cache-set-file-property (file key value multi method user host)
"Set the property KEY of FILE to VALUE, in the cache context of the
user USER on the remote machine HOST."
(with-current-buffer (tramp-get-buffer multi method user host)
(tramp-cache-set file key value)))
(defun tramp-cache-flush-file (file multi method user host)
"Remove all properties of FILE in the cache context of USER on HOST."
(with-current-buffer (tramp-get-buffer multi method user host)
;; REVISIT: Implement me. --daniel@danann.net, 2000-06-01
))
(defun tramp-cache-flush (multi method user host)
"Remove all information from the cache context of USER on HOST."
(with-current-buffer (tramp-get-buffer multi method user host)
;; REVISIT: Implement me. --daniel@danann.net, 2000-06-01
))
(provide 'trampcache)
;;; trampcache.el ends here
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