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+;;; telnet.el --- run a telnet session from within an Emacs buffer
+
+;; Copyright (C) 1985, 1988, 1992, 1994 Free Software Foundation, Inc.
+
+;; Author: William F. Schelter
+;; Maintainer: FSF
+
+;; 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., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; This mode is intended to be used for telnet or rsh to a remote host;
+;; `telnet' and `rsh' are the two entry points.  Multiple telnet or rsh
+;; sessions are supported.
+;;
+;; Normally, input is sent to the remote telnet/rsh line-by-line, as you
+;; type RET or LFD.  C-c C-c sends a C-c to the remote immediately; 
+;; C-c C-z sends C-z immediately.  C-c C-q followed by any character
+;; sends that character immediately.
+;;
+;; All RET characters are filtered out of the output coming back from the
+;; remote system.  The mode tries to do other useful translations based
+;; on what it sees coming back from the other system before the password
+;; query.  It knows about UNIX, ITS, TOPS-20 and Explorer systems.
+;;
+;; You can use the global telnet-host-properties to associate a telnet
+;; program and login name with each host you regularly telnet to.
+
+;;; Code:
+
+;; to do fix software types for lispm:
+;; to eval current expression.  Also to try to send escape keys correctly.
+;; essentially we'll want the rubout-handler off.
+
+;; filter is simplistic but should be okay for typical shell usage.
+;; needs hacking if it is going to deal with asynchronous output in a sane
+;; manner
+
+(require 'comint)
+
+(defvar telnet-host-properties ()
+  "Specify which telnet program to use for particular hosts.
+Each element has the form (HOSTNAME PROGRAM [LOGIN-NAME])
+HOSTNAME says which machine the element applies to.
+PROGRAM says which program to run, to talk to that machine.
+LOGIN-NAME, which is optional, says what to log in as on that machine.")
+
+(defvar telnet-new-line "\r")
+(defvar telnet-mode-map nil)
+(defvar telnet-prompt-pattern "^[^#$%>\n]*[#$%>] *")
+(defvar telnet-replace-c-g nil)
+(make-variable-buffer-local
+ (defvar telnet-remote-echoes t
+   "True if the telnet process will echo input."))
+(make-variable-buffer-local
+ (defvar telnet-interrupt-string "\C-c" "String sent by C-c."))
+
+(defvar telnet-count 0
+  "Number of output strings from telnet process while looking for password.")
+(make-variable-buffer-local 'telnet-count)
+
+(defvar telnet-program "telnet"
+  "Program to run to open a telnet connection.")
+
+(defvar telnet-initial-count -50
+  "Initial value of `telnet-count'.  Should be set to the negative of the
+number of terminal writes telnet will make setting up the host connection.")
+
+(defvar telnet-maximum-count 4
+  "Maximum value `telnet-count' can have.
+After this many passes, we stop looking for initial setup data.
+Should be set to the number of terminal writes telnet will make
+rejecting one login and prompting again for a username and password.")
+
+(defun telnet-interrupt-subjob ()
+  (interactive)
+  "Interrupt the program running through telnet on the remote host."
+  (send-string nil telnet-interrupt-string))
+
+(defun telnet-c-z ()
+  (interactive)
+  (send-string nil "\C-z"))
+
+(defun send-process-next-char ()
+  (interactive)
+  (send-string nil
+	       (char-to-string
+		(let ((inhibit-quit t))
+		  (prog1 (read-char)
+		    (setq quit-flag nil))))))
+
+; initialization on first load.
+(if telnet-mode-map
+    nil
+  (setq telnet-mode-map (nconc (make-sparse-keymap) comint-mode-map))
+  (define-key telnet-mode-map "\C-m" 'telnet-send-input)
+;  (define-key telnet-mode-map "\C-j" 'telnet-send-input)
+  (define-key telnet-mode-map "\C-c\C-q" 'send-process-next-char)
+  (define-key telnet-mode-map "\C-c\C-c" 'telnet-interrupt-subjob) 
+  (define-key telnet-mode-map "\C-c\C-z" 'telnet-c-z))
+
+;;maybe should have a flag for when have found type
+(defun telnet-check-software-type-initialize (string)
+  "Tries to put correct initializations in.  Needs work."
+  (let ((case-fold-search t))
+    (cond ((string-match "unix" string)
+	 (setq telnet-prompt-pattern comint-prompt-regexp)
+	 (setq telnet-new-line "\n"))
+	((string-match "tops-20" string) ;;maybe add telnet-replace-c-g
+	 (setq telnet-prompt-pattern  "[@>]*"))
+	((string-match "its" string)
+	 (setq telnet-prompt-pattern  "^[^*>\n]*[*>] *"))
+	((string-match "explorer" string)  ;;explorer telnet needs work
+	 (setq telnet-replace-c-g ?\n))))
+  (setq comint-prompt-regexp telnet-prompt-pattern))
+
+(defun telnet-initial-filter (proc string)
+  ;For reading up to and including password; also will get machine type.
+  (save-current-buffer
+    (set-buffer (process-buffer proc))
+    (let ((case-fold-search t))
+      (cond ((string-match "No such host" string)
+	     (kill-buffer (process-buffer proc))
+	     (error "No such host"))
+	    ((string-match "passw" string)
+	     (telnet-filter proc string)
+	     (setq telnet-count 0)
+	     (send-string proc (concat (comint-read-noecho "Password: " t)
+				       telnet-new-line))
+	     (clear-this-command-keys))
+	    (t (telnet-check-software-type-initialize string)
+	       (telnet-filter proc string)
+	       (cond ((> telnet-count telnet-maximum-count)
+		      (set-process-filter proc 'telnet-filter))
+		     (t (setq telnet-count (1+ telnet-count)))))))))
+
+;; Identical to comint-simple-send, except that it sends telnet-new-line
+;; instead of "\n".
+(defun telnet-simple-send (proc string)
+  (comint-send-string proc string)
+  (comint-send-string proc telnet-new-line))
+
+(defun telnet-filter (proc string)
+  (save-excursion
+    (set-buffer (process-buffer proc))
+    (let* ((last-insertion (marker-position (process-mark proc)))
+	   (delta (- (point) last-insertion))
+	   (ie (and comint-last-input-end
+		    (marker-position comint-last-input-end)))
+	   (w (get-buffer-window (current-buffer)))
+	   (ws (and w (window-start w))))
+      (goto-char last-insertion)
+      (insert-before-markers string)
+      (set-marker comint-last-output-start last-insertion)
+      (set-marker (process-mark proc) (point))
+      (if ws (set-window-start w ws t))
+      (if ie (set-marker comint-last-input-end ie))
+      (while (progn (skip-chars-backward "^\C-m" last-insertion)
+		    (> (point) last-insertion))
+	(delete-region (1- (point)) (point)))
+      (goto-char (process-mark proc))
+      (and telnet-replace-c-g
+	   (subst-char-in-region last-insertion (point) ?\C-g
+				 telnet-replace-c-g t))
+      ;; If point is after the insertion place, move it
+      ;; along with the text.
+      (if (> delta 0)
+	  (goto-char (+ (process-mark proc) delta))))))
+
+(defun telnet-send-input ()
+  (interactive)
+;  (comint-send-input telnet-new-line telnet-remote-echoes)
+  (comint-send-input)
+  (if telnet-remote-echoes
+      (delete-region comint-last-input-start
+		     comint-last-input-end)))
+
+;;;###autoload (add-hook 'same-window-regexps "\\*telnet-.*\\*\\(\\|<[0-9]+>\\)")
+
+;;;###autoload
+(defun telnet (host)
+  "Open a network login connection to host named HOST (a string).
+Communication with HOST is recorded in a buffer `*PROGRAM-HOST*'
+where PROGRAM is the telnet program being used.  This program
+is controlled by the contents of the global variable `telnet-host-properties',
+falling back on the value of the global variable `telnet-program'.
+Normally input is edited in Emacs and sent a line at a time."
+  (interactive "sOpen connection to host: ")
+  (let* ((comint-delimiter-argument-list '(?\  ?\t))
+	 (properties (cdr (assoc host telnet-host-properties)))
+	 (telnet-program (if properties (car properties) telnet-program))
+         (name (concat telnet-program "-" (comint-arguments host 0 nil) ))
+	 (buffer (get-buffer (concat "*" name "*")))
+	 (telnet-options (if (cdr properties) (cons "-l" (cdr properties))))
+	 process)
+    (if (and buffer (get-buffer-process buffer))
+	(pop-to-buffer (concat "*" name "*"))
+      (pop-to-buffer 
+       (apply 'make-comint name telnet-program nil telnet-options))
+      (setq process (get-buffer-process (current-buffer)))
+      (set-process-filter process 'telnet-initial-filter)
+      ;; Don't send the `open' cmd till telnet is ready for it.
+      (accept-process-output process)
+      (erase-buffer)
+      (send-string process (concat "open " host "\n"))
+      (telnet-mode)
+      (setq comint-input-sender 'telnet-simple-send)
+      (setq telnet-count telnet-initial-count))))
+
+(put 'telnet-mode 'mode-class 'special)
+
+(defun telnet-mode ()
+  "This mode is for using telnet (or rsh) from a buffer to another host.
+It has most of the same commands as comint-mode.
+There is a variable ``telnet-interrupt-string'' which is the character
+sent to try to stop execution of a job on the remote host.
+Data is sent to the remote host when RET is typed.
+
+\\{telnet-mode-map}
+"
+  (interactive)
+  (comint-mode)
+  (setq major-mode 'telnet-mode
+	mode-name "Telnet"
+	comint-prompt-regexp telnet-prompt-pattern)
+  (use-local-map telnet-mode-map)
+  (run-hooks 'telnet-mode-hook))
+
+;;;###autoload (add-hook 'same-window-regexps "\\*rsh-[^-]*\\*\\(\\|<[0-9]*>\\)")
+
+;;;###autoload
+(defun rsh (host)
+  "Open a network login connection to host named HOST (a string).
+Communication with HOST is recorded in a buffer `*rsh-HOST*'.
+Normally input is edited in Emacs and sent a line at a time."
+  (interactive "sOpen rsh connection to host: ")
+  (require 'shell)
+  (let ((name (concat "rsh-" host )))
+    (pop-to-buffer (make-comint name remote-shell-program nil host))
+    (set-process-filter (get-process name) 'telnet-initial-filter)
+    (telnet-mode)
+    (setq telnet-count -16)))
+
+(provide 'telnet)
+
+;;; telnet.el ends here