Avoid recursive load of tramp.el

[gnu-emacs] / lisp / net / tramp.el

diff --git a/lisp/net/tramp.el b/lisp/net/tramp.el
index 51cc13fed7cc75f12e2e1a3b0998f8c71a8ea03f..6cc8275b327747c759d66a2d844f5dad653883d5 100644 (file)
--- a/lisp/net/tramp.el
+++ b/lisp/net/tramp.el
@@ -1943,8 +1943,7 @@ coding system might not be determined.  This function repairs it."
        (add-to-list
         'result (cons (regexp-quote tmpname) (cdr elt)) 'append)))))
 
-;;;###autoload
-(progn (defun tramp-run-real-handler (operation args)
+(defun tramp-run-real-handler (operation args)
   "Invoke normal file name handler for OPERATION.
 First arg specifies the OPERATION, second arg is a list of arguments to
 pass to the OPERATION."
@@ -1958,7 +1957,7 @@ pass to the OPERATION."
            ,(and (eq inhibit-file-name-operation operation)
                  inhibit-file-name-handlers)))
         (inhibit-file-name-operation operation))
-    (apply operation args))))
+    (apply operation args)))
 
 ;;;###autoload
 (progn (defun tramp-completion-run-real-handler (operation args)
@@ -2100,22 +2099,12 @@ ARGS are the arguments OPERATION has been called with."
      (tramp-compat-condition-case-unless-debug ,var ,bodyform ,@handlers)))
 
 ;; Main function.
-;;;###autoload
 (defun tramp-file-name-handler (operation &rest args)
   "Invoke Tramp file name handler.
 Falls back to normal file name handler if no Tramp file name handler exists."
   (if tramp-mode
       (save-match-data
-       (let* ((default-directory
-                ;; Some packages set the default directory to a
-                ;; remote path, before tramp.el has been loaded.
-                ;; This results in recursive loading.  Therefore, we
-                ;; set `default-directory' to a local path.  `args'
-                ;; could also be remote when loading tramp.el, but
-                ;; that would be such perverse we don't care about.
-                (if load-in-progress
-                    temporary-file-directory default-directory))
-              (filename
+       (let* ((filename
                (tramp-replace-environment-variables
                 (apply 'tramp-file-name-for-operation operation args)))
               (completion (tramp-completion-mode-p))
@@ -2227,11 +2216,8 @@ preventing reentrant calls of Tramp.")
   "Invoke Tramp file name completion handler.
 Falls back to normal file name handler if no Tramp file name handler exists."
   ;; We bind `directory-sep-char' here for XEmacs on Windows, which
-  ;; would otherwise use backslash.  For `default-directory', see
-  ;; comment in `tramp-file-name-handler'.
+  ;; would otherwise use backslash.
   (let ((directory-sep-char ?/)
-       (default-directory
-         (if load-in-progress temporary-file-directory default-directory))
        (fn (assoc operation tramp-completion-file-name-handler-alist)))
     (if (and
         ;; When `tramp-mode' is not enabled, we don't do anything.
@@ -2255,15 +2241,43 @@ Falls back to normal file name handler if no Tramp file name handler exists."
       (tramp-completion-run-real-handler operation args)))))
 
 ;;;###autoload
-(progn (defun tramp-register-file-name-handlers ()
+(progn (defun tramp-autoload-file-name-handler (operation &rest args)
+  "Load Tramp file name handler, and perform OPERATION."
+  ;; Avoid recursive loading of tramp.el.
+  (let ((default-directory temporary-file-directory))
+    (load "tramp" nil t))
+  (apply operation args)))
+
+;; `tramp-autoload-file-name-handler' must be registered before
+;; evaluation of site-start and init files, because there might exist
+;; remote files already, f.e. files kept via recentf-mode.  We cannot
+;; autoload `tramp-file-name-handler', because it would result in
+;; recursive loading of tramp.el when `default-directory' is set to
+;; remote.
+;;;###autoload
+(progn (defun tramp-register-autoload-file-name-handlers ()
+  "Add Tramp file name handlers to `file-name-handler-alist' during autoload."
+  (add-to-list 'file-name-handler-alist
+              (cons tramp-file-name-regexp
+                    'tramp-autoload-file-name-handler))
+  (put 'tramp-autoload-file-name-handler 'safe-magic t)
+  (add-to-list 'file-name-handler-alist
+              (cons tramp-completion-file-name-regexp
+                    'tramp-completion-file-name-handler))
+  (put 'tramp-completion-file-name-handler 'safe-magic t)))
+
+;;;###autoload
+(tramp-register-autoload-file-name-handlers)
+
+(defun tramp-register-file-name-handlers ()
   "Add Tramp file name handlers to `file-name-handler-alist'."
   ;; Remove autoloaded handlers from file name handler alist.  Useful,
   ;; if `tramp-syntax' has been changed.
-  (let ((a1 (rassq 'tramp-file-name-handler file-name-handler-alist)))
-    (setq file-name-handler-alist (delq a1 file-name-handler-alist)))
-  (let ((a1 (rassq
-            'tramp-completion-file-name-handler file-name-handler-alist)))
-    (setq file-name-handler-alist (delq a1 file-name-handler-alist)))
+  (dolist (fnh '(tramp-file-name-handler
+                tramp-completion-file-name-handler
+                tramp-autoload-file-name-handler))
+    (let ((a1 (rassq fnh file-name-handler-alist)))
+      (setq file-name-handler-alist (delq a1 file-name-handler-alist))))
   ;; Add the handlers.
   (add-to-list 'file-name-handler-alist
               (cons tramp-file-name-regexp 'tramp-file-name-handler))
@@ -2278,13 +2292,9 @@ Falls back to normal file name handler if no Tramp file name handler exists."
     (let ((entry (rassoc fnh file-name-handler-alist)))
       (when entry
        (setq file-name-handler-alist
-             (cons entry (delete entry file-name-handler-alist))))))))
+             (cons entry (delete entry file-name-handler-alist)))))))
 
-;; `tramp-file-name-handler' must be registered before evaluation of
-;; site-start and init files, because there might exist remote files
-;; already, f.e. files kept via recentf-mode.
-;;;###autoload
-(tramp-register-file-name-handlers)
+(eval-after-load 'tramp (tramp-register-file-name-handlers))
 
 (defun tramp-exists-file-name-handler (operation &rest args)
   "Check, whether OPERATION runs a file name handler."