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;;; tramp-compat.el --- Tramp compatibility functions -*- lexical-binding:t -*-
;; Copyright (C) 2007-2018 Free Software Foundation, Inc.
;; Author: Michael Albinus <michael.albinus@gmx.de>
;; Keywords: comm, processes
;; Package: tramp
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Tramp's main Emacs version for development is Emacs 27. This
;; package provides compatibility functions for Emacs 24, Emacs 25 and
;; Emacs 26.
;;; Code:
(require 'auth-source)
(require 'advice)
(require 'cl-lib)
(require 'custom)
(require 'format-spec)
(require 'parse-time)
(require 'password-cache)
(require 'shell)
(require 'timer)
(require 'ucs-normalize)
(require 'tramp-loaddefs)
;; For not existing functions, obsolete functions, or functions with a
;; changed argument list, there are compiler warnings. We want to
;; avoid them in cases we know what we do.
(defmacro tramp-compat-funcall (function &rest arguments)
"Call FUNCTION if it exists. Do not raise compiler warnings."
`(when (functionp ,function)
(with-no-warnings (funcall ,function ,@arguments))))
(defsubst tramp-compat-temporary-file-directory ()
"Return name of directory for temporary files.
It is the default value of `temporary-file-directory'."
;; We must return a local directory. If it is remote, we could run
;; into an infloop.
(eval (car (get 'temporary-file-directory 'standard-value))))
(defsubst tramp-compat-make-temp-file (f &optional dir-flag)
"Create a local temporary file (compat function).
Add the extension of F, if existing."
(let* (file-name-handler-alist
(prefix (expand-file-name
(symbol-value 'tramp-temp-name-prefix)
(tramp-compat-temporary-file-directory)))
(extension (file-name-extension f t)))
(make-temp-file prefix dir-flag extension)))
;; `temporary-file-directory' as function is introduced with Emacs 26.1.
(defalias 'tramp-compat-temporary-file-directory-function
(if (fboundp 'temporary-file-directory)
'temporary-file-directory
'tramp-handle-temporary-file-directory))
(defun tramp-compat-process-running-p (process-name)
"Returns t if system process PROCESS-NAME is running for `user-login-name'."
(when (stringp process-name)
(cond
;; GNU Emacs 22 on w32.
((fboundp 'w32-window-exists-p)
(tramp-compat-funcall 'w32-window-exists-p process-name process-name))
;; GNU Emacs 23.
((and (fboundp 'list-system-processes) (fboundp 'process-attributes))
(let (result)
(dolist (pid (tramp-compat-funcall 'list-system-processes) result)
(let ((attributes (process-attributes pid)))
(when (and (string-equal
(cdr (assoc 'user attributes)) (user-login-name))
(let ((comm (cdr (assoc 'comm attributes))))
;; The returned command name could be truncated
;; to 15 characters. Therefore, we cannot check
;; for `string-equal'.
(and comm (string-match
(concat "^" (regexp-quote comm))
process-name))))
(setq result t)))))))))
;; `default-toplevel-value' has been declared in Emacs 24.4.
(unless (fboundp 'default-toplevel-value)
(defalias 'default-toplevel-value 'symbol-value))
;; `file-attribute-*' are introduced in Emacs 25.1.
(if (fboundp 'file-attribute-type)
(defalias 'tramp-compat-file-attribute-type 'file-attribute-type)
(defsubst tramp-compat-file-attribute-type (attributes)
"The type field in ATTRIBUTES returned by `file-attributes'.
The value is either t for directory, string (name linked to) for
symbolic link, or nil."
(nth 0 attributes)))
(if (fboundp 'file-attribute-link-number)
(defalias 'tramp-compat-file-attribute-link-number
'file-attribute-link-number)
(defsubst tramp-compat-file-attribute-link-number (attributes)
"Return the number of links in ATTRIBUTES returned by `file-attributes'."
(nth 1 attributes)))
(if (fboundp 'file-attribute-user-id)
(defalias 'tramp-compat-file-attribute-user-id 'file-attribute-user-id)
(defsubst tramp-compat-file-attribute-user-id (attributes)
"The UID field in ATTRIBUTES returned by `file-attributes'.
This is either a string or a number. If a string value cannot be
looked up, a numeric value, either an integer or a float, is
returned."
(nth 2 attributes)))
(if (fboundp 'file-attribute-group-id)
(defalias 'tramp-compat-file-attribute-group-id 'file-attribute-group-id)
(defsubst tramp-compat-file-attribute-group-id (attributes)
"The GID field in ATTRIBUTES returned by `file-attributes'.
This is either a string or a number. If a string value cannot be
looked up, a numeric value, either an integer or a float, is
returned."
(nth 3 attributes)))
(if (fboundp 'file-attribute-modification-time)
(defalias 'tramp-compat-file-attribute-modification-time
'file-attribute-modification-time)
(defsubst tramp-compat-file-attribute-modification-time (attributes)
"The modification time in ATTRIBUTES returned by `file-attributes'.
This is the time of the last change to the file's contents, and
is a Lisp timestamp in the style of `current-time'."
(nth 5 attributes)))
(if (fboundp 'file-attribute-size)
(defalias 'tramp-compat-file-attribute-size 'file-attribute-size)
(defsubst tramp-compat-file-attribute-size (attributes)
"The size (in bytes) in ATTRIBUTES returned by `file-attributes'.
If the size is too large for a fixnum, this is a bignum in Emacs 27
and later, and is a float in Emacs 26 and earlier."
(nth 7 attributes)))
(if (fboundp 'file-attribute-modes)
(defalias 'tramp-compat-file-attribute-modes 'file-attribute-modes)
(defsubst tramp-compat-file-attribute-modes (attributes)
"The file modes in ATTRIBUTES returned by `file-attributes'.
This is a string of ten letters or dashes as in ls -l."
(nth 8 attributes)))
;; `format-message' is new in Emacs 25.1.
(unless (fboundp 'format-message)
(defalias 'format-message 'format))
;; `directory-name-p' is new in Emacs 25.1.
(if (fboundp 'directory-name-p)
(defalias 'tramp-compat-directory-name-p 'directory-name-p)
(defsubst tramp-compat-directory-name-p (name)
"Return non-nil if NAME ends with a directory separator character."
(let ((len (length name))
(lastc ?.))
(if (> len 0)
(setq lastc (aref name (1- len))))
(or (= lastc ?/)
(and (memq system-type '(windows-nt ms-dos))
(= lastc ?\\))))))
;; `file-missing' is introduced in Emacs 26.1.
(defconst tramp-file-missing
(if (get 'file-missing 'error-conditions) 'file-missing 'file-error)
"The error symbol for the `file-missing' error.")
;; `file-name-quoted-p', `file-name-quote' and `file-name-unquote' are
;; introduced in Emacs 26.
(eval-and-compile
(if (fboundp 'file-name-quoted-p)
(defalias 'tramp-compat-file-name-quoted-p 'file-name-quoted-p)
(defsubst tramp-compat-file-name-quoted-p (name)
"Whether NAME is quoted with prefix \"/:\".
If NAME is a remote file name, check the local part of NAME."
(string-match "^/:" (or (file-remote-p name 'localname) name))))
(if (fboundp 'file-name-quote)
(defalias 'tramp-compat-file-name-quote 'file-name-quote)
(defsubst tramp-compat-file-name-quote (name)
"Add the quotation prefix \"/:\" to file NAME.
If NAME is a remote file name, the local part of NAME is quoted."
(if (tramp-compat-file-name-quoted-p name)
name
(concat
(file-remote-p name) "/:" (or (file-remote-p name 'localname) name)))))
(if (fboundp 'file-name-unquote)
(defalias 'tramp-compat-file-name-unquote 'file-name-unquote)
(defsubst tramp-compat-file-name-unquote (name)
"Remove quotation prefix \"/:\" from file NAME.
If NAME is a remote file name, the local part of NAME is unquoted."
(save-match-data
(let ((localname (or (file-remote-p name 'localname) name)))
(when (tramp-compat-file-name-quoted-p localname)
(setq
localname
(replace-match
(if (= (length localname) 2) "/" "") nil t localname)))
(concat (file-remote-p name) localname))))))
;; `tramp-syntax' has changed its meaning in Emacs 26. We still
;; support old settings.
(defsubst tramp-compat-tramp-syntax ()
"Return proper value of `tramp-syntax'."
(cond ((eq tramp-syntax 'ftp) 'default)
((eq tramp-syntax 'sep) 'separate)
(t tramp-syntax)))
;; `cl-struct-slot-info' has been introduced with Emacs 25.
(defmacro tramp-compat-tramp-file-name-slots ()
(if (fboundp 'cl-struct-slot-info)
`(cdr (mapcar 'car (cl-struct-slot-info 'tramp-file-name)))
`(cdr (mapcar 'car (get 'tramp-file-name 'cl-struct-slots)))))
;; The signature of `tramp-make-tramp-file-name' has been changed.
;; Therefore, we cannot us `url-tramp-convert-url-to-tramp' prior
;; Emacs 26.1. We use `temporary-file-directory' as indicator.
(defconst tramp-compat-use-url-tramp-p (fboundp 'temporary-file-directory)
"Whether to use url-tramp.el.")
;; `exec-path' is new in Emacs 27.1.
(eval-and-compile
(if (fboundp 'exec-path)
(defalias 'tramp-compat-exec-path 'exec-path)
(defun tramp-compat-exec-path ()
"List of directories to search programs to run in remote subprocesses."
(let ((handler (find-file-name-handler default-directory 'exec-path)))
(if handler
(funcall handler 'exec-path)
exec-path)))))
(add-hook 'tramp-unload-hook
(lambda ()
(unload-feature 'tramp-loaddefs 'force)
(unload-feature 'tramp-compat 'force)))
(provide 'tramp-compat)
;;; TODO:
;;; tramp-compat.el ends here
|
