2012-09-04 14:29:25 -06:00
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;;; ssh.el --- remote login interface
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;; Copyright (C) 1996, 97, 98, 2001 Noah S. Friedman
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;; Author: Noah Friedman <friedman@splode.com>
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;; Maintainer: friedman@splode.com
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;; Keywords: unix, comm
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;; Created: 1996-07-03
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2012-09-04 14:30:53 -06:00
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;; $Id: ssh.el,v 1.1 2005/10/18 08:31:33 davidswelt Exp $
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2012-09-04 14:29:25 -06:00
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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2012-09-04 14:30:53 -06:00
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;; along with this program; if not, you can either send email to this
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;; program's maintainer or write to: The Free Software Foundation,
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;; Inc.; 59 Temple Place, Suite 330; Boston, MA 02111-1307, USA.
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2012-09-04 14:29:25 -06:00
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;;; Commentary:
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;; Support for remote logins using `ssh'.
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;; This program is layered on top of shell.el; the code here only accounts
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;; for the variations needed to handle a remote process, e.g. directory
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;; tracking and the sending of some special characters.
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;; If you wish for ssh mode to prompt you in the minibuffer for
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;; passwords when a password prompt appears, just enter m-x send-invisible
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;; and type in your line, or add `comint-watch-for-password-prompt' to
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;; `comint-output-filter-functions'.
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;;; Code:
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(require 'comint)
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(require 'shell)
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(defgroup ssh nil
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"Secure remote login interface"
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:group 'processes
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:group 'unix)
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(defcustom ssh-program "ssh"
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"*Name of program to invoke ssh"
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:type 'string
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:group 'ssh)
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(defcustom ssh-explicit-args '()
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"*List of arguments to pass to ssh on the command line."
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:type '(repeat (string :tag "Argument"))
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:group 'ssh)
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(defcustom ssh-mode-hook nil
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"*Hooks to run after setting current buffer to ssh-mode."
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:type 'hook
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:group 'ssh)
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(defcustom ssh-process-connection-type t
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"*If non-`nil', use a pty for the local ssh process.
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If `nil', use a pipe (if pipes are supported on the local system).
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Generally it is better not to waste ptys on systems which have a static
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number of them. However, ssh won't allocate a pty on the remote host
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unless one is used locally as well."
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:type '(choice (const :tag "ptys" t)
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(const :tag "pipes" nil))
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:group 'ssh)
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(defcustom ssh-directory-tracking-mode 'local
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"*Control whether and how to do directory tracking in an ssh buffer.
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nil means don't do directory tracking.
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t means do so using an ftp remote file name.
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Any other value means do directory tracking using local file names.
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This works only if the remote machine and the local one
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share the same directories (through NFS). This is the default.
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This variable becomes local to a buffer when set in any fashion for it.
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It is better to use the function of the same name to change the behavior of
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directory tracking in an ssh session once it has begun, rather than
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simply setting this variable, since the function does the necessary
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re-synching of directories."
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:type '(choice (const :tag "off" nil)
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(const :tag "ftp" t)
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(const :tag "local" local))
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:group 'ssh)
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(make-variable-buffer-local 'ssh-directory-tracking-mode)
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(defcustom ssh-x-display-follow-current-frame t
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"*Control X display used by ssh for X tunneling.
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If non-nil and ssh is configured to enable remote X display forwarding,
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the display of the current emacs frame will be used rather than the display
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to which the emacs process was originally launched. \(These may be
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different if currently using a remote frame.\)"
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:type 'boolean
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:group 'ssh)
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(defcustom ssh-host nil
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"*The name of the remote host. This variable is buffer-local."
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:type '(choice (const nil) string)
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:group 'ssh)
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(defcustom ssh-remote-user nil
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"*The username used on the remote host.
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This variable is buffer-local and defaults to your local user name.
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If ssh is invoked with the `-l' option to specify the remote username,
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this variable is set from that."
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:type '(choice (const nil) string)
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:group 'ssh)
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;; Initialize ssh mode map.
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(defvar ssh-mode-map '())
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(cond
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((null ssh-mode-map)
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(setq ssh-mode-map (if (consp shell-mode-map)
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(cons 'keymap shell-mode-map)
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(copy-keymap shell-mode-map)))
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(define-key ssh-mode-map "\C-c\C-c" 'ssh-send-Ctrl-C)
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(define-key ssh-mode-map "\C-c\C-d" 'ssh-send-Ctrl-D)
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(define-key ssh-mode-map "\C-c\C-z" 'ssh-send-Ctrl-Z)
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(define-key ssh-mode-map "\C-c\C-\\" 'ssh-send-Ctrl-backslash)
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(define-key ssh-mode-map "\C-d" 'ssh-delchar-or-send-Ctrl-D)
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(define-key ssh-mode-map "\C-i" 'ssh-tab-or-complete)))
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;;;###autoload (add-hook 'same-window-regexps "^\\*ssh-.*\\*\\(\\|<[0-9]+>\\)")
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(defvar ssh-history nil)
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2012-09-04 14:30:53 -06:00
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;;;###
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(defun ssh-hostname-at-point ()
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(let ((hostname (thing-at-point 'url)))
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(and hostname (substring-no-properties hostname 7))))
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2012-09-04 14:29:25 -06:00
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;;;###autoload
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(defun ssh (input-args &optional buffer)
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"Open a network login connection via `ssh' with args INPUT-ARGS.
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INPUT-ARGS should start with a host name; it may also contain
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other arguments for `ssh'.
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Input is sent line-at-a-time to the remote connection.
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Communication with the remote host is recorded in a buffer `*ssh-HOST*'
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\(or `*ssh-USER@HOST*' if the remote username differs\).
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If a prefix argument is given and the buffer `*ssh-HOST*' already exists,
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a new buffer with a different connection will be made.
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When called from a program, if the optional second argument BUFFER is
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a string or buffer, it specifies the buffer to use.
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The variable `ssh-program' contains the name of the actual program to
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run. It can be a relative or absolute path.
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The variable `ssh-explicit-args' is a list of arguments to give to
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the ssh when starting. They are prepended to any arguments given in
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INPUT-ARGS.
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If the default value of `ssh-directory-tracking-mode' is t, then the
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default directory in that buffer is set to a remote (FTP) file name to
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access your home directory on the remote machine. Occasionally this causes
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an error, if you cannot access the home directory on that machine. This
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error is harmless as long as you don't try to use that default directory.
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If `ssh-directory-tracking-mode' is neither t nor nil, then the default
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directory is initially set up to your (local) home directory.
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This is useful if the remote machine and your local machine
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share the same files via NFS. This is the default.
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If you wish to change directory tracking styles during a session, use the
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function `ssh-directory-tracking-mode' rather than simply setting the
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variable.
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The variable `ssh-x-display-follow-current-frame' can be used to specify
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how ssh X display tunelling interacts with frames on remote displays."
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(interactive (list
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(read-from-minibuffer "ssh arguments (hostname first): "
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(ssh-hostname-at-point)
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nil nil 'ssh-history)
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current-prefix-arg))
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(let* ((process-connection-type ssh-process-connection-type)
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(args (ssh-parse-words input-args))
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(host-parts (split-string (car args) "@"))
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(host (car (last host-parts)))
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(user (or (cadr (member "-l" args))
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(if (= 2 (length host-parts)) (car host-parts))
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(user-login-name)))
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(buffer-name (if (string= user (user-login-name))
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(format "*ssh %s*" host)
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(format "*ssh %s@%s*" user host)))
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proc)
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(and ssh-explicit-args
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(setq args (append ssh-explicit-args args)))
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(cond ((null buffer))
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((stringp buffer)
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(setq buffer-name buffer))
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((bufferp buffer)
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(setq buffer-name (buffer-name buffer)))
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((numberp buffer)
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(setq buffer-name (format "%s<%d>" buffer-name buffer)))
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(t
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(setq buffer-name (generate-new-buffer-name buffer-name))))
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(setq buffer (get-buffer-create buffer-name))
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(pop-to-buffer buffer-name)
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(cond
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((comint-check-proc buffer-name))
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(t
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(ssh-with-check-display-override
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#'(lambda ()
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(comint-exec buffer buffer-name ssh-program nil args)))
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(setq proc (get-buffer-process buffer))
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;; Set process-mark to point-max in case there is text in the
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;; buffer from a previous exited process.
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(set-marker (process-mark proc) (point-max))
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2012-09-04 14:30:53 -06:00
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;; comint-output-filter-functions is treated like a hook: it is
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;; processed via run-hooks or run-hooks-with-args in later versions
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;; of emacs.
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;; comint-output-filter-functions should already have a
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;; permanent-local property, at least in emacs 19.27 or later.
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(cond
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((fboundp 'make-local-hook)
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(make-local-hook 'comint-output-filter-functions)
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(add-hook 'comint-output-filter-functions 'ssh-carriage-filter nil t))
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(t
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(make-local-variable 'comint-output-filter-functions)
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(add-hook 'comint-output-filter-functions 'ssh-carriage-filter)))
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(ssh-mode)
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(make-local-variable 'ssh-host)
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(setq ssh-host host)
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(make-local-variable 'ssh-remote-user)
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(setq ssh-remote-user user)
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(condition-case ()
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(cond ((eq ssh-directory-tracking-mode t)
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;; Do this here, rather than calling the tracking mode
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;; function, to avoid a gratuitous resync check; the default
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;; should be the user's home directory, be it local or remote.
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(setq comint-file-name-prefix
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(concat "/" ssh-remote-user "@" ssh-host ":"))
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(cd-absolute comint-file-name-prefix))
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((null ssh-directory-tracking-mode))
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(t
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(cd-absolute (concat comint-file-name-prefix "~/"))))
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(error nil)))))
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buffer)
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(put 'ssh-mode 'mode-class 'special)
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(defun ssh-mode ()
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"Set major-mode for ssh sessions.
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If `ssh-mode-hook' is set, run it."
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(interactive)
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(kill-all-local-variables)
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(shell-mode)
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(setq major-mode 'ssh-mode)
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(setq mode-name "ssh")
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(use-local-map ssh-mode-map)
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(setq shell-dirtrackp ssh-directory-tracking-mode)
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(make-local-variable 'comint-file-name-prefix)
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(run-hooks 'ssh-mode-hook))
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(defun ssh-directory-tracking-mode (&optional prefix)
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"Do remote or local directory tracking, or disable entirely.
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If called with no prefix argument or a unspecified prefix argument (just
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``\\[universal-argument]'' with no number) do remote directory tracking via
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ange-ftp. If called as a function, give it no argument.
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If called with a negative prefix argument, disable directory tracking
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entirely.
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If called with a positive, numeric prefix argument, e.g.
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``\\[universal-argument] 1 M-x ssh-directory-tracking-mode\'',
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then do directory tracking but assume the remote filesystem is the same as
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the local system. This only works in general if the remote machine and the
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local one share the same directories (through NFS)."
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(interactive "P")
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(cond
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((or (null prefix)
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(consp prefix))
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(setq ssh-directory-tracking-mode t)
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(setq shell-dirtrackp t)
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(setq comint-file-name-prefix
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(concat "/" ssh-remote-user "@" ssh-host ":")))
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((< prefix 0)
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(setq ssh-directory-tracking-mode nil)
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(setq shell-dirtrackp nil))
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(t
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(setq ssh-directory-tracking-mode 'local)
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(setq comint-file-name-prefix "")
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(setq shell-dirtrackp t)))
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(cond
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(shell-dirtrackp
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(let* ((proc (get-buffer-process (current-buffer)))
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(proc-mark (process-mark proc))
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(current-input (buffer-substring proc-mark (point-max)))
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(orig-point (point))
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(offset (and (>= orig-point proc-mark)
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(- (point-max) orig-point))))
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(unwind-protect
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(progn
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(delete-region proc-mark (point-max))
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(goto-char (point-max))
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(shell-resync-dirs))
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(goto-char proc-mark)
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(insert current-input)
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(if offset
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(goto-char (- (point-max) offset))
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(goto-char orig-point)))))))
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;; Check to see if we should override the X display name that the ssh
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;; process will inherit from the environment, which could affect where
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;; remote clients will appear when using X forwarding.
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;;
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;; If ssh-x-display-follow-current-frame is non-nil, this function
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;; overrides the process-environment display for the called function.
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(defun ssh-with-check-display-override (fn)
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(let (frame-disp emacs-disp)
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(cond ((and ssh-x-display-follow-current-frame
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(eq window-system 'x)
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(setq frame-disp (cdr (assq 'display (frame-parameters))))
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(setq emacs-disp (getenv "DISPLAY"))
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;; setenv is expensive, so don't do all that work if
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;; there's no point.
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(not (string= frame-disp emacs-disp)))
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;; Don't shadow process-environment completely because the
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;; called function might legitimately want to modify other
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;; environment variables permanently; just save and restore
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;; original global display value.
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(unwind-protect
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(progn
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(setenv "DISPLAY" frame-disp)
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(funcall fn))
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(setenv "DISPLAY" emacs-disp)))
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(t
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(funcall fn)))))
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;; rudimentary parser to split text into tokens. Text in single or double
|
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;; quotes is considered one token, though nested quoting may not work.
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;;
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;; e.g. (ssh-parse-words "host -o 'Compression no' -X")
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;; => ("host" "-o" "Compression no" "-X")
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;;
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;; Use a temporary buffer to do work because regexps against strings are
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;; not powerful enough to check boundaries without excessive substring
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;; consing (\` only matches at start of string, not at start of search).
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(defun ssh-parse-words (line)
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(let ((list nil)
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(text nil)
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buf)
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(unwind-protect
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(save-match-data
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(save-excursion
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(setq buf (generate-new-buffer " *ssh-parse-words*"))
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(set-buffer buf)
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(insert line)
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(goto-char (point-min))
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(while (not (eobp))
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(setq text nil)
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(and (looking-at "\\`[ \t]+")
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(narrow-to-region (match-end 0) (point-max)))
|
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|
|
(cond ((looking-at "\\`\\(['\"]\\)\\([^\\1]+\\)\\1")
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|
(setq text (buffer-substring (match-beginning 2)
|
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|
|
(match-end 2))))
|
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|
((looking-at "\\`[^ \t]+")
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(setq text (buffer-substring (point-min) (match-end 0)))))
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(narrow-to-region (match-end 0) (point-max))
|
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|
(and text (setq list (cons text list))))))
|
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|
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|
|
(kill-buffer buf))
|
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|
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|
|
(nreverse list)))
|
|
|
|
|
|
|
2012-09-04 14:30:53 -06:00
|
|
|
|
(defun ssh-carriage-filter (string)
|
|
|
|
|
|
(let* ((point-marker (point-marker))
|
|
|
|
|
|
(end (process-mark (get-buffer-process (current-buffer))))
|
|
|
|
|
|
(beg (or (and (boundp 'comint-last-output-start)
|
|
|
|
|
|
comint-last-output-start)
|
|
|
|
|
|
(- end (length string)))))
|
|
|
|
|
|
(goto-char beg)
|
|
|
|
|
|
(while (search-forward "\C-m" end t)
|
|
|
|
|
|
(delete-char -1))
|
|
|
|
|
|
(goto-char point-marker)))
|
|
|
|
|
|
|
2012-09-04 14:29:25 -06:00
|
|
|
|
(defun ssh-send-Ctrl-C ()
|
|
|
|
|
|
(interactive)
|
|
|
|
|
|
(process-send-string nil "\C-c"))
|
|
|
|
|
|
|
|
|
|
|
|
(defun ssh-send-Ctrl-D ()
|
|
|
|
|
|
(interactive)
|
|
|
|
|
|
(process-send-string nil "\C-d"))
|
|
|
|
|
|
|
|
|
|
|
|
(defun ssh-send-Ctrl-Z ()
|
|
|
|
|
|
(interactive)
|
|
|
|
|
|
(process-send-string nil "\C-z"))
|
|
|
|
|
|
|
|
|
|
|
|
(defun ssh-send-Ctrl-backslash ()
|
|
|
|
|
|
(interactive)
|
|
|
|
|
|
(process-send-string nil "\C-\\"))
|
|
|
|
|
|
|
|
|
|
|
|
(defun ssh-delchar-or-send-Ctrl-D (arg)
|
|
|
|
|
|
"\
|
|
|
|
|
|
Delete ARG characters forward, or send a C-d to process if at end of buffer."
|
|
|
|
|
|
(interactive "p")
|
|
|
|
|
|
(if (eobp)
|
|
|
|
|
|
(ssh-send-Ctrl-D)
|
|
|
|
|
|
(delete-char arg)))
|
|
|
|
|
|
|
|
|
|
|
|
(defun ssh-tab-or-complete ()
|
|
|
|
|
|
"Complete file name if doing directory tracking, or just insert TAB."
|
|
|
|
|
|
(interactive)
|
|
|
|
|
|
(if ssh-directory-tracking-mode
|
|
|
|
|
|
(comint-dynamic-complete)
|
|
|
|
|
|
(insert "\C-i")))
|
|
|
|
|
|
|
|
|
|
|
|
(provide 'ssh)
|
|
|
|
|
|
|
|
|
|
|
|
;;; ssh.el ends here
|
