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;;; comint.el --- general command interpreter in a window stuff
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;; Copyright (C) 1988, 1990, 1992, 1993 Free Software Foundation, Inc.
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;; Author: Olin Shivers <shivers@cs.cmu.edu>
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;; Adapted-by: Simon Marshall <s.marshall@dcs.hull.ac.uk>
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;; Keywords: processes
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;; This file is part of GNU Emacs.
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;; 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.
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;; 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.
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;; 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, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:

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;;; Please send me bug reports, bug fixes, and extensions, so that I can
;;; merge them into the master source.
;;;     - Olin Shivers (shivers@cs.cmu.edu)
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;;;     - Simon Marshall (s.marshall@dcs.hull.ac.uk)
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;;; This file defines a general command-interpreter-in-a-buffer package
;;; (comint mode). The idea is that you can build specific process-in-a-buffer
;;; modes on top of comint mode -- e.g., lisp, shell, scheme, T, soar, ....
;;; This way, all these specific packages share a common base functionality, 
;;; and a common set of bindings, which makes them easier to use (and
;;; saves code, implementation time, etc., etc.).

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;;; Several packages are already defined using comint mode:
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;;; - shell.el defines a shell-in-a-buffer mode.
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;;; - cmulisp.el defines a simple lisp-in-a-buffer mode.
;;;
;;; - The file cmuscheme.el defines a scheme-in-a-buffer mode.
;;; - The file tea.el tunes scheme and inferior-scheme modes for T.
;;; - The file soar.el tunes lisp and inferior-lisp modes for Soar.
;;; - cmutex.el defines tex and latex modes that invoke tex, latex, bibtex,
;;;   previewers, and printers from within emacs.
;;; - background.el allows csh-like job control inside emacs.
;;; It is pretty easy to make new derived modes for other processes.

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;;; For documentation on the functionality provided by comint mode, and
;;; the hooks available for customising it, see the comments below.
;;; For further information on the standard derived modes (shell, 
;;; inferior-lisp, inferior-scheme, ...), see the relevant source files.

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;;; For hints on converting existing process modes (e.g., tex-mode,
;;; background, dbx, gdb, kermit, prolog, telnet) to use comint-mode
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;;; instead of shell-mode, see the notes at the end of this file.


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;;; Brief Command Documentation:
;;;============================================================================
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;;; Comint Mode Commands: (common to all derived modes, like shell & cmulisp
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;;; mode)
;;;
;;; m-p	    comint-previous-input    	    Cycle backwards in input history
;;; m-n	    comint-next-input  	    	    Cycle forwards
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;;; m-r     comint-previous-matching-input  Previous input matching a regexp
;;; m-s     comint-next-matching-input      Next input that matches
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;;; m-c-l   comint-show-output		    Show last batch of process output
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;;; return  comint-send-input
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;;; c-a     comint-bol                      Beginning of line; skip prompt
;;; c-d	    comint-delchar-or-maybe-eof     Delete char unless at end of buff
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;;; c-c c-u comint-kill-input	    	    ^u
;;; c-c c-w backward-kill-word    	    ^w
;;; c-c c-c comint-interrupt-subjob 	    ^c
;;; c-c c-z comint-stop-subjob	    	    ^z
;;; c-c c-\ comint-quit-subjob	    	    ^\
;;; c-c c-o comint-kill-output		    Delete last batch of process output
;;; c-c c-r comint-show-output		    Show last batch of process output
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;;; c-c c-h comint-dynamic-list-input-ring  List input history
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;;;
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;;; Not bound by default in comint-mode (some are in shell mode)
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;;; send-invisible			Read a line w/o echo, and send to proc
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;;; comint-dynamic-complete-filename	Complete filename at point.
;;; comint-dynamic-complete-variable    Complete variable name at point.
;;; comint-dynamic-list-filename-completions List completions in help buffer.
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;;; comint-replace-by-expanded-filename	Expand and complete filename at point;
;;;					replace with expanded/completed name.
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;;; comint-replace-by-expanded-history	Expand history at point;
;;;					replace with expanded name.
;;; comint-magic-space                  Expand history and add (a) space(s).
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;;; comint-kill-subjob			No mercy.
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;;; comint-show-maximum-output          Show as much output as possible.
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;;; comint-continue-subjob		Send CONT signal to buffer's process
;;;					group. Useful if you accidentally
;;;					suspend your process (with C-c C-z).

;;; comint-mode-hook is the comint mode hook. Basically for your keybindings.
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;;; Code:

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(require 'ring)
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;;; Buffer Local Variables:
;;;============================================================================
;;; Comint mode buffer local variables:
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;;;     comint-prompt-regexp    - string       comint-bol uses to match prompt
;;;     comint-delimiter-argument-list - list  For delimiters and arguments
;;;     comint-last-input-start - marker       Handy if inferior always echoes
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;;;     comint-last-input-end   - marker       For comint-kill-output command
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;;;     comint-input-ring-size  - integer      For the input history
;;;     comint-input-ring       - ring             mechanism
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;;;     comint-input-ring-index - number           ...
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;;;     comint-input-autoexpand - symbol           ...
;;;     comint-input-ignoredups - boolean          ...
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;;;     comint-last-input-match - string           ...
;;;     comint-get-old-input    - function     Hooks for specific 
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;;;     comint-get-current-command - function      process-in-a-buffer
;;;     comint-dynamic-complete-command-command -  function modes.
;;;     comint-after-partial-filename-command -
;;;     comint-input-sentinel   - function         ...
;;;     comint-input-filter     - function         ...
;;;     comint-input-send	- function         ...
;;;     comint-eol-on-send	- boolean          ...
;;;     comint-process-echoes   - boolean          ...
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;;;     comint-scroll-to-bottom-on-input - symbol For scroll behavior
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;;;     comint-scroll-to-bottom-on-output - symbol    ...
;;;     comint-scroll-show-maximum-output - boolean   ...
;;;
;;; Comint mode non-buffer local variables:
;;;     comint-completion-addsuffix - boolean   For file name completion
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;;;     comint-completion-autolist  - boolean       behavior
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;;;     comint-completion-recexact  - boolean       ...
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(defvar comint-prompt-regexp "^"
  "Regexp to recognise prompts in the inferior process.
Defaults to \"^\", the null string at BOL.
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Good choices:
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  Canonical Lisp: \"^[^> \\n]*>+:? *\" (Lucid, franz, kcl, T, cscheme, oaklisp)
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  Lucid Common Lisp: \"^\\\\(>\\\\|\\\\(->\\\\)+\\\\) *\"
  franz: \"^\\\\(->\\\\|<[0-9]*>:\\\\) *\"
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  kcl: \"^>+ *\"
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  shell: \"^[^#$%>\\n]*[#$%>] *\"
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  T: \"^>+ *\"
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This is a good thing to set in mode hooks.")
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(defvar comint-delimiter-argument-list ()
  "List of characters to recognise as separate arguments in input.
Strings comprising a character in this list will separate the arguments
surrounding them, and also be regarded as arguments in their own right (unlike
whitespace).  See `comint-arguments'.
Defaults to (), the empty list.

Good choices:
  shell: \(\"|\" \"&\" \"<\" \">\" \"\(\" \")\" \";\")

This is a good thing to set in mode hooks.")

(defvar comint-input-autoexpand 'history
  "*If non-nil, expand input command history references on completion.
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This mirrors the optional behavior of tcsh (its autoexpand and histlit).
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If the value is `input', then the expansion is seen on input.
If the value is `history', then the expansion is only when inserting
into the buffer's input ring.  See also `comint-magic-space' and
`comint-dynamic-complete'.

This variable is buffer-local.")

(defvar comint-input-ignoredups nil
  "*If non-nil, don't add input matching the last on the input ring.
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This mirrors the optional behavior of bash.
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This variable is buffer-local.")

(defvar comint-input-ring-file-name nil
  "*If non-nil, name of the file to read/write input history.
See also `comint-read-input-ring' and `comint-write-input-ring'.

This variable is buffer-local, and is a good thing to set in mode hooks.")

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(defvar comint-scroll-to-bottom-on-input nil
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  "*Controls whether input to interpreter causes window to scroll.
If nil, then do not scroll.  If t or `all', scroll all windows showing buffer.
If `this', scroll only the selected window.

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The default is nil.
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See `comint-preinput-scroll-to-bottom'.  This variable is buffer-local.")

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(defvar comint-scroll-to-bottom-on-output nil
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  "*Controls whether interpreter output causes window to scroll.
If nil, then do not scroll.  If t or `all', scroll all windows showing buffer.
If `this', scroll only the selected window.
If `others', scroll only those that are not the selected window.
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The default is nil.
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See variable `comint-scroll-show-maximum-output' and function
`comint-postoutput-scroll-to-bottom'.  This variable is buffer-local.")
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(defvar comint-scroll-show-maximum-output nil
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  "*Controls how interpreter output causes window to scroll.
If non-nil, then show the maximum output when the window is scrolled.
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See variable `comint-scroll-to-bottom-on-output' and function
`comint-postoutput-scroll-to-bottom'.  This variable is buffer-local.")
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(defvar comint-input-ring-size 32
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  "Size of input history ring.")
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(defvar comint-process-echoes nil
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  "*If non-nil, assume that the subprocess echoes any input.
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If so, delete one copy of the input so that only one copy eventually
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appears in the buffer.
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This variable is buffer-local.")

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;;; Here are the per-interpreter hooks.
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(defvar comint-get-old-input (function comint-get-old-input-default)
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  "Function that returns old text in comint mode.
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This function is called when return is typed while the point is in old text.
It returns the text to be submitted as process input.  The default is
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`comint-get-old-input-default', which grabs the current line, and strips off
leading text matching `comint-prompt-regexp'.")
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(defvar comint-after-partial-filename-command 'comint-after-partial-filename
  "Function that returns non-nil if point is after a file name.
By default this is `comint-after-partial-filename'.

This is a good thing to set in mode hooks.")

(defvar comint-dynamic-complete-filename-command
  'comint-dynamic-complete-filename
  "Function that dynamically completes the file name at point.
By default this is `comint-dynamic-complete-filename', though an alternative is
`comint-replace-by-expanded-filename'.

This is a good thing to set in mode hooks.")

(defvar comint-dynamic-complete-command-command
  'comint-dynamic-complete-filename
  "Function that dynamically completes the command at point.
By default this is `comint-dynamic-complete-filename'.

This is a good thing to set in mode hooks.")

(defvar comint-get-current-command 'comint-get-old-input-default
  "Function that returns the current command including arguments.
By default this is `comint-get-old-input-default', meaning the whole line.

This is a good thing to set in mode hooks.")

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(defvar comint-input-sentinel (function ignore)
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  "Called on each input submitted to comint mode process by `comint-send-input'.
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Thus it can, for instance, track cd/pushd/popd commands issued to a shell.")
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(defvar comint-input-filter
  (function (lambda (str) (not (string-match "\\`\\s *\\'" str))))
  "Predicate for filtering additions to input history.
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Takes one argument, the input.  If non-nil, the input may be saved on the input
history list.  Default is to save anything that isn't all whitespace.")

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(defvar comint-output-filter-functions '(comint-postoutput-scroll-to-bottom) 
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  "Functions to call after output is inserted into the buffer.
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One possible function is `comint-postoutput-scroll-to-bottom'.
These functions get one argument, a string containing the text just inserted.
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This variable is buffer-local.")
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(defvar comint-input-sender (function comint-simple-send)
  "Function to actually send to PROCESS the STRING submitted by user.
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Usually this is just `comint-simple-send', but if your mode needs to 
massage the input string, put a different function here.
`comint-simple-send' just sends the string plus a newline.
This is called from the user command `comint-send-input'.")
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(defvar comint-eol-on-send t
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  "*Non-nil means go to the end of the line before sending input.
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See `comint-send-input'.")
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(defvar comint-mode-hook '()
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  "Called upon entry into comint-mode
This is run before the process is cranked up.")

(defvar comint-exec-hook '()
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  "Called each time a process is exec'd by `comint-exec'.
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This is called after the process is cranked up.  It is useful for things that
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must be done each time a process is executed in a comint mode buffer (e.g.,
`(process-kill-without-query)').  In contrast, the `comint-mode-hook' is only
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executed once when the buffer is created.")

(defvar comint-mode-map nil)
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(defvar comint-ptyp t
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  "Non-nil if communications via pty; false if by pipe.  Buffer local.
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This is to work around a bug in Emacs process signalling.")
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(defvar comint-input-ring nil)
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(defvar comint-last-input-start)
(defvar comint-last-input-end)
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(defvar comint-input-ring-index nil
  "Index of last matched history element.")
(defvar comint-matching-input-from-input-string ""
  "Input previously used to match input history.")
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(put 'comint-input-ring 'permanent-local t)
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(put 'comint-input-ring-index 'permanent-local t)
(put 'comint-input-autoexpand 'permanent-local t)
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(put 'comint-output-filter-functions 'permanent-local t)
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(put 'comint-scroll-to-bottom-on-input 'permanent-local t)
(put 'comint-scroll-to-bottom-on-output 'permanent-local t)
(put 'comint-scroll-show-maximum-output 'permanent-local t)
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(put 'comint-ptyp 'permanent-local t)
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(defun comint-mode ()
  "Major mode for interacting with an inferior interpreter.
Interpreter name is same as buffer name, sans the asterisks.
Return at end of buffer sends line as input.
Return not at end copies rest of line to end and sends it.
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Setting variable `comint-eol-on-send' means jump to the end of the line
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before submitting new input.
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This mode is customised to create major modes such as Inferior Lisp
mode, Shell mode, etc.  This can be done by setting the hooks
`comint-input-sentinel', `comint-input-filter', `comint-input-sender'
and `comint-get-old-input' to appropriate functions, and the variable
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`comint-prompt-regexp' to the appropriate regular expression.
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An input history is maintained of size `comint-input-ring-size', and
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can be accessed with the commands \\[comint-next-input], \\[comint-previous-input], and \\[comint-dynamic-list-input-ring].
Input ring history expansion can be achieved with the commands
\\[comint-replace-by-expanded-history] or \\[comint-magic-space].
Input ring expansion is controlled by the variable `comint-input-autoexpand',
and addition is controlled by the variable `comint-input-ignoredups'.

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Commands with no default key bindings include `send-invisible',
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`comint-dynamic-complete', `comint-list-dynamic-completions', and 
`comint-magic-space'.

Input to, and output from, the subprocess can cause the window to scroll to
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the end of the buffer.  See variables `comint-output-filter-functions',
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`comint-scroll-to-bottom-on-input', and `comint-scroll-to-bottom-on-output'.
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If you accidentally suspend your process, use \\[comint-continue-subjob]
to continue it.

\\{comint-mode-map}

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Entry to this mode runs the hooks on `comint-mode-hook'."
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  (interactive)
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  ;; Do not remove this.  All major modes must do this.
  (kill-all-local-variables)
  (setq major-mode 'comint-mode)
  (setq mode-name "Comint")
  (setq mode-line-process '(": %s"))
  (use-local-map comint-mode-map)
  (make-local-variable 'comint-last-input-start)
  (setq comint-last-input-start (make-marker))
  (make-local-variable 'comint-last-input-end)
  (setq comint-last-input-end (make-marker))
  (make-local-variable 'comint-last-output-start)
  (setq comint-last-output-start (make-marker))
  (make-local-variable 'comint-prompt-regexp)        ; Don't set; default
  (make-local-variable 'comint-input-ring-size)      ; ...to global val.
  (make-local-variable 'comint-input-ring)
  (make-local-variable 'comint-input-ring-file-name)
  (or (and (boundp 'comint-input-ring) comint-input-ring)
      (setq comint-input-ring (make-ring comint-input-ring-size)))
  (make-local-variable 'comint-input-ring-index)
  (or (and (boundp 'comint-input-ring-index) comint-input-ring-index)
      (setq comint-input-ring-index nil))
  (make-local-variable 'comint-matching-input-from-input-string)
  (make-local-variable 'comint-input-autoexpand)
  (make-local-variable 'comint-input-ignoredups)
  (make-local-variable 'comint-delimiter-argument-list)
  (make-local-variable 'comint-after-partial-filename-command)
  (make-local-variable 'comint-dynamic-complete-filename-command)
  (make-local-variable 'comint-dynamic-complete-command-command)
  (make-local-variable 'comint-get-current-command)
  (make-local-variable 'comint-get-old-input)
  (make-local-variable 'comint-input-sentinel)
  (make-local-variable 'comint-input-filter)
  (make-local-variable 'comint-input-sender)
  (make-local-variable 'comint-eol-on-send)
  (make-local-variable 'comint-scroll-to-bottom-on-input)
  (make-local-variable 'comint-scroll-to-bottom-on-output)
  (make-local-variable 'comint-scroll-show-maximum-output)
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  (make-local-variable 'pre-command-hook)
  (add-hook 'pre-command-hook 'comint-preinput-scroll-to-bottom)
  (make-local-variable 'comint-output-filter-functions)
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  (make-local-variable 'comint-ptyp)
  (make-local-variable 'comint-exec-hook)
  (make-local-variable 'comint-process-echoes)
  (run-hooks 'comint-mode-hook))
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(if comint-mode-map
    nil
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  ;; Keys:
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  (setq comint-mode-map (make-sparse-keymap))
  (define-key comint-mode-map "\ep" 'comint-previous-input)
  (define-key comint-mode-map "\en" 'comint-next-input)
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  (define-key comint-mode-map "\er" 'comint-previous-matching-input)
  (define-key comint-mode-map "\es" 'comint-next-matching-input)
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  (define-key comint-mode-map [?\A-\M-r] 'comint-previous-matching-input-from-input)
  (define-key comint-mode-map [?\A-\M-s] 'comint-next-matching-input-from-input)
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  (define-key comint-mode-map "\e\C-l" 'comint-show-output)
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  (define-key comint-mode-map "\C-m" 'comint-send-input)
  (define-key comint-mode-map "\C-d" 'comint-delchar-or-maybe-eof)
  (define-key comint-mode-map "\C-a" 'comint-bol)
  (define-key comint-mode-map "\C-c\C-u" 'comint-kill-input)
  (define-key comint-mode-map "\C-c\C-w" 'backward-kill-word)
  (define-key comint-mode-map "\C-c\C-c" 'comint-interrupt-subjob)
  (define-key comint-mode-map "\C-c\C-z" 'comint-stop-subjob)
  (define-key comint-mode-map "\C-c\C-\\" 'comint-quit-subjob)
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  ;; " ; Stops emacs-19.19's hilit getting confused.
  (define-key comint-mode-map "\C-c\C-m" 'comint-copy-old-input)
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  (define-key comint-mode-map "\C-c\C-o" 'comint-kill-output)
  (define-key comint-mode-map "\C-c\C-r" 'comint-show-output)
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  (define-key comint-mode-map "\C-c\C-e" 'comint-show-maximum-output)
  (define-key comint-mode-map "\C-c\C-h" 'comint-dynamic-list-input-ring)
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  (define-key comint-mode-map "\C-c\C-n" 'comint-next-prompt)
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  (define-key comint-mode-map "\C-c\C-p" 'comint-previous-prompt)
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  (define-key comint-mode-map "\C-c\C-d" 'comint-send-eof)
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  ;; Menu bars:
  ;; completion:
  (define-key comint-mode-map [menu-bar completion] 
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    (cons "Complete" (make-sparse-keymap "Complete")))
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  (define-key comint-mode-map [menu-bar completion complete-expand]
    '("Expand File Name" . comint-replace-by-expanded-filename))
  (define-key comint-mode-map [menu-bar completion complete-listing]
    '("File Completion Listing" . comint-dynamic-list-filename-completions))
  (define-key comint-mode-map [menu-bar completion complete-variable]
    '("Complete Variable Name" . comint-dynamic-complete-variable))
  (define-key comint-mode-map [menu-bar completion complete-command]
    '("Complete Command Name" . (lambda () (interactive)
				  (funcall
				   comint-dynamic-complete-command-command))))
  (define-key comint-mode-map [menu-bar completion complete-file]
    '("Complete File Name" . comint-dynamic-complete-filename))
  (define-key comint-mode-map [menu-bar completion complete]
    '("Complete Before Point" . comint-dynamic-complete))
  ;; Input history:
  (define-key comint-mode-map [menu-bar input] 
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    (cons "In/Out" (make-sparse-keymap "In/Out")))
  (define-key comint-mode-map [menu-bar input kill-output]
    '("Kill Current Output Group" . comint-kill-output))
  (define-key comint-mode-map [menu-bar input next-prompt]
    '("Forward Output Group" . comint-next-prompt))
  (define-key comint-mode-map [menu-bar input previous-prompt]
    '("Backward Output Group" . comint-previous-prompt))
  (define-key comint-mode-map [menu-bar input show-maximum-output]
    '("Show Maximum Output" . comint-show-maximum-output))
  (define-key comint-mode-map [menu-bar input show-output]
    '("Show Current Output Group" . comint-show-output))
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  (define-key comint-mode-map [menu-bar input kill-input]
    '("Kill Current Input" . comint-kill-input))
  (define-key comint-mode-map [menu-bar input copy-input]
    '("Copy Old Input" . comint-copy-old-input))
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  (define-key comint-mode-map [menu-bar input forward-matching-history]
    '("Forward Matching Input..." . comint-forward-matching-input))
  (define-key comint-mode-map [menu-bar input backward-matching-history]
    '("Backward Matching Input..." . comint-backward-matching-input))
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  (define-key comint-mode-map [menu-bar input next-matching-history]
    '("Next Matching Input..." . comint-next-matching-input))
  (define-key comint-mode-map [menu-bar input previous-matching-history]
    '("Previous Matching Input..." . comint-previous-matching-input))
  (define-key comint-mode-map [menu-bar input next-matching-history-from-input]
    '("Next Matching Current Input" . comint-next-matching-input-from-input))
  (define-key comint-mode-map [menu-bar input previous-matching-history-from-input]
    '("Previous Matching Current Input" . comint-previous-matching-input-from-input))
  (define-key comint-mode-map [menu-bar input next-history]
    '("Next Input" . comint-next-input))
  (define-key comint-mode-map [menu-bar input previous-history]
    '("Previous Input" . comint-previous-input))
  (define-key comint-mode-map [menu-bar input list-history]
    '("List Input History" . comint-dynamic-list-input-ring))
  (define-key comint-mode-map [menu-bar input expand-history]
    '("Expand History Before Point" . comint-replace-by-expanded-history))
  ;; Signals
  (define-key comint-mode-map [menu-bar signals]
    (cons "Signals" (make-sparse-keymap "Signals")))
  (define-key comint-mode-map [menu-bar signals eof]
    '("EOF" . comint-send-eof))
  (define-key comint-mode-map [menu-bar signals kill]
    '("KILL" . comint-kill-subjob))
  (define-key comint-mode-map [menu-bar signals quit]
    '("QUIT" . comint-quit-subjob))
  (define-key comint-mode-map [menu-bar signals cont]
    '("CONT" . comint-continue-subjob))
  (define-key comint-mode-map [menu-bar signals stop]
    '("STOP" . comint-stop-subjob))
  (define-key comint-mode-map [menu-bar signals break]
    '("BREAK" . comint-interrupt-subjob))
  ;; Put them in the menu bar:
  (setq menu-bar-final-items (append '(completion input output signals)
				     menu-bar-final-items))
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  )


;;; This function is used to make a full copy of the comint mode map,
;;; so that client modes won't interfere with each other. This function
;;; isn't necessary in emacs 18.5x, but we keep it around for 18.4x versions.
(defun full-copy-sparse-keymap (km)
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  "Recursively copy the sparse keymap KM."
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  (cond ((consp km)
	 (cons (full-copy-sparse-keymap (car km))
	       (full-copy-sparse-keymap (cdr km))))
	(t km)))

(defun comint-check-proc (buffer)
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  "Return t if there is a living process associated w/buffer BUFFER.
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Living means the status is `run' or `stop'.
BUFFER can be either a buffer or the name of one."
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  (let ((proc (get-buffer-process buffer)))
    (and proc (memq (process-status proc) '(run stop)))))
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;;; Note that this guy, unlike shell.el's make-shell, barfs if you pass it ()
;;; for the second argument (program).
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;;;###autoload
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(defun make-comint (name program &optional startfile &rest switches)
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  "Make a comint process NAME in a buffer, running PROGRAM.
The name of the buffer is made by surrounding NAME with `*'s.
If there is already a running process in that buffer, it is not restarted.
Optional third arg STARTFILE is the name of a file to send the contents of to 
the process.  Any more args are arguments to PROGRAM."
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  (let ((buffer (get-buffer-create (concat "*" name "*"))))
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    ;; If no process, or nuked process, crank up a new one and put buffer in
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    ;; comint mode.  Otherwise, leave buffer and existing process alone.
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    (cond ((not (comint-check-proc buffer))
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	   (save-excursion
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	     (set-buffer buffer)
	     (comint-mode)) ; Install local vars, mode, keymap, ...
	   (comint-exec buffer name program startfile switches)))
    buffer))

(defun comint-exec (buffer name command startfile switches)
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  "Start up a process in buffer BUFFER for comint modes.
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Blasts any old process running in the buffer.  Doesn't set the buffer mode.
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You can use this to cheaply run a series of processes in the same comint
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buffer.  The hook `comint-exec-hook' is run after each exec."
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  (save-excursion
    (set-buffer buffer)
    (let ((proc (get-buffer-process buffer)))	; Blast any old process.
      (if proc (delete-process proc)))
    ;; Crank up a new process
    (let ((proc (comint-exec-1 name buffer command switches)))
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      (set-process-filter proc 'comint-output-filter)
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      (make-local-variable 'comint-ptyp)
      (setq comint-ptyp process-connection-type) ; T if pty, NIL if pipe.
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      ;; Jump to the end, and set the process mark.
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      (goto-char (point-max))
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      (set-marker (process-mark proc) (point))
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      ;; Feed it the startfile.
      (cond (startfile
	     ;;This is guaranteed to wait long enough
	     ;;but has bad results if the comint does not prompt at all
	     ;;	     (while (= size (buffer-size))
	     ;;	       (sleep-for 1))
	     ;;I hope 1 second is enough!
	     (sleep-for 1)
	     (goto-char (point-max))
	     (insert-file-contents startfile)
	     (setq startfile (buffer-substring (point) (point-max)))
	     (delete-region (point) (point-max))
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	     (comint-send-string proc startfile)))
    (run-hooks 'comint-exec-hook)
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    buffer)))
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;;; This auxiliary function cranks up the process for comint-exec in
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;;; the appropriate environment.
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(defun comint-exec-1 (name buffer command switches)
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  (let ((process-environment process-environment))
    (setenv "TERMCAP" (format "emacs:co#%d:tc=unknown" (frame-width)))
    (setenv "TERM" "emacs")
    (setenv "EMACS" "t")
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    (apply 'start-process name buffer command switches)))
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;;; Input history processing in a buffer
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;;; ===========================================================================
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;;; Useful input history functions, courtesy of the Ergo group.

;;; Eleven commands:
;;; comint-dynamic-list-input-ring	List history in help buffer.
;;; comint-previous-input		Previous input...
;;; comint-previous-matching-input	...matching a string.
;;; comint-previous-matching-input-from-input ... matching the current input.
;;; comint-next-input			Next input...
;;; comint-next-matching-input		...matching a string.
;;; comint-next-matching-input-from-input     ... matching the current input.
;;; comint-backward-matching-input      Backwards input...
;;; comint-forward-matching-input       ...matching a string.
;;; comint-replace-by-expanded-history	Expand history at point;
;;;					replace with expanded history.
;;; comint-magic-space			Expand history and insert space.
;;;
;;; Two functions:
;;; comint-read-input-ring              Read into comint-input-ring...
;;; comint-write-input-ring             Write to comint-input-ring-file-name.

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(defun comint-read-input-ring (&optional silent)
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  "Sets the buffer's `comint-input-ring' from a history file.
The name of the file is given by the variable `comint-input-ring-file-name'.
The history ring is of size `comint-input-ring-size', regardless of file size.
If `comint-input-ring-file-name' is nil this function does nothing.

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If the optional argument SILENT is non-nil, we say nothing about a
failure to read the history file.
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This function is useful for major mode commands and mode hooks.

The structure of the history file should be one input command per line,
with the most recent command last.
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See also `comint-input-ignoredups' and `comint-write-input-ring'."
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  (cond ((or (null comint-input-ring-file-name)
	     (equal comint-input-ring-file-name ""))
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	 nil)
	((not (file-readable-p comint-input-ring-file-name))
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	 (or silent
	     (message "Cannot read history file %s"
		      comint-input-ring-file-name)))
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	(t
	 (let ((history-buf (get-file-buffer comint-input-ring-file-name))
	       (ring (make-ring comint-input-ring-size)))
	   (save-excursion
	     (set-buffer (or history-buf
			     (find-file-noselect comint-input-ring-file-name)))
	     ;; Save restriction in case file is already visited...
	     ;; Watch for those date stamps in history files!
	     (save-excursion
	       (save-restriction
		 (widen)
		 (goto-char (point-min))
		 (while (re-search-forward "^\\s *\\([^#].*\\)\\s *$" nil t)
		   (let ((history (buffer-substring (match-beginning 1)
						    (match-end 1))))
		     (if (or (null comint-input-ignoredups)
			     (ring-empty-p ring)
			     (not (string-equal (ring-ref ring 0) history)))
			 (ring-insert ring history)))))
	       ;; Kill buffer unless already visited.
	       (if (null history-buf)
		   (kill-buffer nil))))
	   (setq comint-input-ring ring
		 comint-input-ring-index nil)))))

(defun comint-write-input-ring ()
  "Writes the buffer's `comint-input-ring' to a history file.
The name of the file is given by the variable `comint-input-ring-file-name'.
The original contents of the file are lost if `comint-input-ring' is not empty.
If `comint-input-ring-file-name' is nil this function does nothing.

Useful within process sentinels.

See also `comint-read-input-ring'."
  (cond ((or (null comint-input-ring-file-name)
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	     (equal comint-input-ring-file-name "")
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	     (null comint-input-ring) (ring-empty-p comint-input-ring))
	 nil)
	((not (file-writable-p comint-input-ring-file-name))
	 (message "Cannot write history file %s" comint-input-ring-file-name))
	(t
	 (let* ((history-buf (get-buffer-create " *Temp Input History*"))
		(ring comint-input-ring)
		(file comint-input-ring-file-name)
		(index (ring-length ring)))
	   ;; Write it all out into a buffer first.  Much faster, but messier,
	   ;; than writing it one line at a time.
	   (save-excursion
	     (set-buffer history-buf)
	     (erase-buffer)
	     (while (> index 0)
	       (setq index (1- index))
	       (insert (ring-ref ring index) ?\n))
	     (write-region (buffer-string) nil file nil 'no-message)
	     (kill-buffer nil))))))


(defun comint-dynamic-list-input-ring ()
  "List in help buffer the buffer's input history."
  (interactive)
  (if (or (not (ring-p comint-input-ring))
	  (ring-empty-p comint-input-ring))
      (message "No history")
    (let ((history nil)
	  (history-buffer " *Input History*")
	  (index (1- (ring-length comint-input-ring)))
	  (conf (current-window-configuration)))
      ;; We have to build up a list ourselves from the ring vector.
      (while (>= index 0)
	(setq history (cons (ring-ref comint-input-ring index) history)
	      index (1- index)))
      ;; Change "completion" to "history reference"
      ;; to make the display accurate.
      (with-output-to-temp-buffer history-buffer
	(display-completion-list history)
	(set-buffer history-buffer)
	(forward-line 3)
	(while (search-backward "completion" nil 'move)
	  (replace-match "history reference")))
      (sit-for 0)
      (message "Hit space to flush")
      (let ((ch (read-event)))
	(if (eq ch ?\ )
	    (set-window-configuration conf)
	  (setq unread-command-events (list ch)))))))


(defun comint-regexp-arg (prompt)
  ;; Return list of regexp and prefix arg using PROMPT.
  (let* ((minibuffer-history-sexp-flag nil)
	 ;; Don't clobber this.
	 (last-command last-command)
	 (regexp (read-from-minibuffer prompt nil nil nil
				       'minibuffer-history-search-history)))
    (list (if (string-equal regexp "")
	      (setcar minibuffer-history-search-history
		      (nth 1 minibuffer-history-search-history))
	    regexp)
	  (prefix-numeric-value current-prefix-arg))))

(defun comint-search-arg (arg)
  ;; First make sure there is a ring and that we are after the process mark
  (cond ((not (comint-after-pmark-p))
	 (error "Not at command line"))
	((or (null comint-input-ring)
	     (ring-empty-p comint-input-ring))
	 (error "Empty input ring"))
	((zerop arg)
	 ;; arg of zero resets search from beginning, and uses arg of 1
	 (setq comint-input-ring-index nil)
	 1)
	(t
	 arg)))

(defun comint-search-start (arg)
  ;; Index to start a directional search, starting at comint-input-ring-index
  (if comint-input-ring-index
      ;; If a search is running, offset by 1 in direction of arg
      (mod (+ comint-input-ring-index (if (> arg 0) 1 -1))
	   (ring-length comint-input-ring))
    ;; For a new search, start from beginning or end, as appropriate
    (if (>= arg 0)
	0				       ; First elt for forward search
      (1- (ring-length comint-input-ring)))))  ; Last elt for backward search

(defun comint-previous-input-string (arg)
  "Return the string ARG places along the input ring.
Moves relative to `comint-input-ring-index'."
  (ring-ref comint-input-ring (if comint-input-ring-index
				  (mod (+ arg comint-input-ring-index) 
				       (ring-length comint-input-ring))
				arg)))
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(defun comint-previous-input (arg)
  "Cycle backwards through input history."
  (interactive "*p")
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  (comint-previous-matching-input "." arg))
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(defun comint-next-input (arg)
  "Cycle forwards through input history."
  (interactive "*p")
  (comint-previous-input (- arg)))

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(defun comint-previous-matching-input-string (regexp arg)
  "Return the string matching REGEXP ARG places along the input ring.
Moves relative to `comint-input-ring-index'."
  (let* ((pos (comint-previous-matching-input-string-position regexp arg)))
    (if pos (ring-ref comint-input-ring pos))))

(defun comint-previous-matching-input-string-position (regexp arg &optional start)
  "Return the index matching REGEXP ARG places along the input ring.
Moves relative to START, or `comint-input-ring-index'."
  (if (or (not (ring-p comint-input-ring))
	  (ring-empty-p comint-input-ring))
      (error "No history"))
  (let* ((len (ring-length comint-input-ring))
	 (motion (if (> arg 0) 1 -1))
	 (n (mod (- (or start (comint-search-start arg)) motion) len))
	 (tried-each-ring-item nil)
	 (prev nil))
    ;; Do the whole search as many times as the argument says.
    (while (and (/= arg 0) (not tried-each-ring-item))
      ;; Step once.
      (setq prev n
	    n (mod (+ n motion) len))
      ;; If we haven't reached a match, step some more.
      (while (and (< n len) (not tried-each-ring-item)
		  (not (string-match regexp (ring-ref comint-input-ring n))))
	(setq n (mod (+ n motion) len)
	      ;; If we have gone all the way around in this search.
	      tried-each-ring-item (= n prev)))
      (setq arg (if (> arg 0) (1- arg) (1+ arg))))
    ;; Now that we know which ring element to use, if we found it, return that.
    (if (string-match regexp (ring-ref comint-input-ring n))
	n)))

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(defun comint-previous-matching-input (regexp arg)
  "Search backwards through input history for match for REGEXP.
\(Previous history elements are earlier commands.)
With prefix argument N, search for Nth previous match.
If N is negative, find the next or Nth next match."
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  (interactive (comint-regexp-arg "Previous input matching (regexp): "))
  (setq arg (comint-search-arg arg))
  (let ((pos (comint-previous-matching-input-string-position regexp arg)))
    ;; Has a match been found?
    (if (null pos)
	(error "Not found")
      (setq comint-input-ring-index pos)
      (message "History item: %d" (1+ pos))
      (delete-region 
       ;; Can't use kill-region as it sets this-command
       (process-mark (get-buffer-process (current-buffer))) (point))
      (insert (ring-ref comint-input-ring pos)))))
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(defun comint-next-matching-input (regexp arg)
  "Search forwards through input history for match for REGEXP.
\(Later history elements are more recent commands.)
With prefix argument N, search for Nth following match.
If N is negative, find the previous or Nth previous match."
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  (interactive (comint-regexp-arg "Next input matching (regexp): "))
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  (comint-previous-matching-input regexp (- arg)))
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(defun comint-previous-matching-input-from-input (arg)
  "Search backwards through input history for match for current input.
\(Previous history elements are earlier commands.)
With prefix argument N, search for Nth previous match.
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If N is negative, search forwards for the -Nth following match."
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  (interactive "p")
  (if (not (memq last-command '(comint-previous-matching-input-from-input
				comint-next-matching-input-from-input)))
      ;; Starting a new search
      (setq comint-matching-input-from-input-string
	    (buffer-substring 
	     (process-mark (get-buffer-process (current-buffer))) 
	     (point))
	    comint-input-ring-index nil))
  (comint-previous-matching-input
   (concat "^" (regexp-quote comint-matching-input-from-input-string))
   arg))

(defun comint-next-matching-input-from-input (arg)
  "Search forwards through input history for match for current input.
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\(Following history elements are more recent commands.)
With prefix argument N, search for Nth following match.
If N is negative, search backwards for the -Nth previous match."
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  (interactive "p")
  (comint-previous-matching-input-from-input (- arg)))


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(defun comint-replace-by-expanded-history (&optional silent)
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  "Expand input command history references before point.
This function depends on the buffer's idea of the input history, which may not
match the command interpreter's idea, assuming it has one.

Assumes history syntax is like typical Un*x shells'.  However, since emacs
cannot know the interpreter's idea of input line numbers, assuming it has one,
it cannot expand absolute input line number references.

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If the optional argument SILENT is non-nil, never complain
even if history reference seems erroneous.

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See also `comint-magic-space'."
  (interactive)
  (save-excursion
    (let ((toend (- (save-excursion (end-of-line nil) (point)) (point)))
	  (start (progn (comint-bol nil) (point))))
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      (while (progn
	       (skip-chars-forward "^!^"
				   (save-excursion
				     (end-of-line nil) (- (point) toend)))
	       (< (point)
		  (save-excursion
		    (end-of-line nil) (- (point) toend))))
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	;; This seems a bit complex.  We look for references such as !!, !-num,
	;; !foo, !?foo, !{bar}, !?{bar}, ^oh, ^my^, ^god^it, ^never^ends^.
	;; If that wasn't enough, the plings can be suffixed with argument
	;; range specifiers.
	;; Argument ranges are complex too, so we hive off the input line,
	;; referenced with plings, with the range string to `comint-args'.
	(setq comint-input-ring-index nil)
	(cond ((or (= (preceding-char) ?\\)
		   (comint-within-quotes start (point)))
	       ;; The history is quoted, or we're in quotes.
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	       (goto-char (1+ (point))))
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	      ((looking-at "![0-9]+\\($\\|[^-]\\)")
	       ;; We cannot know the interpreter's idea of input line numbers.
	       (goto-char (match-end 0))
	       (message "Absolute reference cannot be expanded"))
	      ((looking-at "!-\\([0-9]+\\)\\(:?[0-9^$*-]+\\)?")
	       ;; Just a number of args from `number' lines backward.
	       (let ((number (1- (string-to-number
				  (buffer-substring (match-beginning 1)
						    (match-end 1))))))
		 (if (<= number (ring-length comint-input-ring))
		     (progn
		       (replace-match
			(comint-args (comint-previous-input-string number)
				     (match-beginning 2) (match-end 2)) t t)
		       (setq comint-input-ring-index number)
		       (message "History item: %d" (1+ number)))
		   (goto-char (match-end 0))
		   (message "Relative reference exceeds input history size"))))
	      ((or (looking-at "!!?:?\\([0-9^$*-]+\\)") (looking-at "!!"))
	       ;; Just a number of args from the previous input line.
	       (replace-match
		(comint-args (comint-previous-input-string 0)
			     (match-beginning 1) (match-end 1)) t t))
	      ((looking-at
		"!\\??\\({\\(.+\\)}\\|\\(\\sw+\\)\\)\\(:?[0-9^$*-]+\\)?")
	       ;; Most recent input starting with or containing (possibly
	       ;; protected) string, maybe just a number of args.  Phew.
	       (let* ((mb1 (match-beginning 1)) (me1 (match-end 1))
		      (mb2 (match-beginning 2)) (me2 (match-end 2))
		      (exp (buffer-substring (or mb2 mb1) (or me2 me1)))
		      (pref (if (save-match-data (looking-at "!\\?")) "" "^"))
		      (pos (save-match-data
			     (comint-previous-matching-input-string-position
			      (concat pref (regexp-quote exp)) 1))))
		 (if (null pos)
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		     (or silent
			 (progn (message "Not found")
				(goto-char (match-end 0))
				(ding)))
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		   (setq comint-input-ring-index pos)
		   (message "History item: %d" (1+ pos))
		   (replace-match
		    (comint-args (ring-ref comint-input-ring pos)
				 (match-beginning 4) (match-end 4))
		    t t))))
	      ((looking-at "\\^\\([^^]+\\)\\^?\\([^^]*\\)\\^?")
	       ;; Quick substitution on the previous input line.
	       (let ((old (buffer-substring (match-beginning 1) (match-end 1)))
		     (new (buffer-substring (match-beginning 2) (match-end 2)))
		     (pos nil))
		 (replace-match (comint-previous-input-string 0) t t)
		 (setq pos (point))
		 (goto-char (match-beginning 0))
		 (if (search-forward old pos t)
		     (replace-match new t t)
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		   (or silent
		       (progn
			 (message "Not found")
			 (ding))))))
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	      (t
	       (goto-char (match-end 0))))))))


(defun comint-magic-space (arg)
  "Expand input history references before point and insert ARG spaces.
A useful command to bind to SPC.  See `comint-replace-by-expanded-history'."
  (interactive "p")
  (comint-replace-by-expanded-history)
  (self-insert-command arg))

(defun comint-within-quotes (beg end)
  "Return t if the number of quotes between BEG and END is odd.
Quotes are single and double."
  (let ((countsq (comint-how-many-region "\\(^\\|[^\\\\]\\)\'" beg end))
	(countdq (comint-how-many-region "\\(^\\|[^\\\\]\\)\"" beg end)))
    (or (= (mod countsq 2) 1) (= (mod countdq 2) 1))))

(defun comint-how-many-region (regexp beg end)
  "Return number of matches for REGEXP from BEG to END."
  (let ((count 0))
    (save-excursion
      (save-match-data
	(goto-char beg)
	(while (re-search-forward regexp end t)
	  (setq count (1+ count)))))
    count))

(defun comint-args (string begin end)
  ;; From STRING, return the args depending on the range specified in the text
  ;; from BEGIN to END.  If BEGIN is nil, assume all args.  Ignore leading `:'.
  ;; Range can be x-y, x-, -y, where x/y can be [0-9], *, ^, $.
  (save-match-data
    (if (null begin)
	(comint-arguments string 0 nil)
      (let* ((range (buffer-substring
		     (if (eq (char-after begin) ?:) (1+ begin) begin) end))
	     (nth (cond ((string-match "^[*^]" range) 1)
			((string-match "^-" range) 0)
			((string-equal range "$") nil)
			(t (string-to-number range))))
	     (mth (cond ((string-match "[-*$]$" range) nil)
			((string-match "-" range)
			 (string-to-number (substring range (match-end 0))))
			(t nth))))
	(comint-arguments string nth mth)))))

(defun comint-delim-arg (arg)
  ;; Return a list of arguments from ARG.  If there's a quote in there, just
  ;; a list of the arg, otherwise try and break up using characters in
  ;; comint-delimiter-argument-list.  Returned list is backwards.
  (if (or (null comint-delimiter-argument-list)
	  (string-match "[\"\'\`]" arg))
      (list arg)
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    (let ((not-delim (concat
		      (format "\\([^%s]" (mapconcat
					(function (lambda (d) (regexp-quote d)))
					comint-delimiter-argument-list ""))
		      "\\|"
		      (mapconcat (function (lambda (d)
					     (concat "\\\\" (regexp-quote d))))
				 comint-delimiter-argument-list "\\|")
		      "\\)+"))
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	  (delim-str (mapconcat (function (lambda (d)
					    (concat (regexp-quote d) "+")))
				comint-delimiter-argument-list "\\|"))
	  (args ()) (pos 0))
      (while (or (eq pos (string-match not-delim arg pos))
		 (eq pos (string-match delim-str arg pos)))
	(setq pos (match-end 0)
	      args (cons (substring arg (match-beginning 0) pos) args)))
      args)))

(defun comint-arguments (string nth mth)
  "Return from STRING the NTH to MTH arguments.
NTH and/or MTH can be nil, which means the last argument.
Returned arguments are separated by single spaces.  Arguments are assumed to be
delimited by whitespace.  Strings comprising characters in the variable
`comint-delimiter-argument-list' are treated as delimiters and arguments.
Argument 0 is the command name."
  (let ((arg "\\(\\S \\|\\(\"[^\"]*\"\\|\'[^\']*\'\\|\`[^\`]*\`\\)\\)+")
	(args ()) (pos 0) (str nil))
    ;; We build a list of all the args.  Unnecessary, but more efficient, when
    ;; ranges of args are required, than picking out one by one and recursing.
    (while (string-match arg string pos)
      (setq pos (match-end 0)
	    str (substring string (match-beginning 0) pos)
	    args (nconc (comint-delim-arg str) args)))
    (let ((n (or nth (1- (length args))))
	  (m (if mth (1- (- (length args) mth)) 0)))
      (mapconcat
       (function (lambda (a) a)) (nthcdr n (nreverse (nthcdr m args))) " "))))

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;;;
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;;; Input processing stuff
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;;;
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(defun comint-send-input () 
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  "Send input to process.
After the process output mark, sends all text from the process mark to
point as input to the process.  Before the process output mark, calls value
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of variable `comint-get-old-input' to retrieve old input, copies it to the
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process mark, and sends it.  If variable `comint-process-echoes' is nil,
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a terminal newline is also inserted into the buffer and sent to the process
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\(if it is non-nil, all text from the process mark to point is deleted,
since it is assumed the remote process will re-echo it).
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Any history reference may be expanded depending on the value of the variable
`comint-input-autoexpand'.  The value of variable `comint-input-sentinel' is
called on the input before sending it.  The input is entered into the input
history ring, if the value of variable `comint-input-filter' returns non-nil
when called on the input.
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If variable `comint-eol-on-send' is non-nil, then point is moved to the
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end of line before sending the input.

`comint-get-old-input', `comint-input-sentinel', and `comint-input-filter'
are chosen according to the command interpreter running in the buffer.  E.g.,
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If the interpreter is the csh,
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    comint-get-old-input is the default: take the current line, discard any
        initial string matching regexp comint-prompt-regexp.
    comint-input-sentinel monitors input for \"cd\", \"pushd\", and \"popd\" 
        commands. When it sees one, it cd's the buffer.
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    comint-input-filter is the default: returns t if the input isn't all white
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	space.
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If the comint is Lucid Common Lisp, 
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    comint-get-old-input snarfs the sexp ending at point.
    comint-input-sentinel does nothing.
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    comint-input-filter returns nil if the input matches input-filter-regexp,
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        which matches (1) all whitespace (2) :a, :c, etc.

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Similarly for Soar, Scheme, etc."
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  (interactive)
  ;; Note that the input string does not include its terminal newline.
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  (let ((proc (get-buffer-process (current-buffer))))
    (if (not proc) (error "Current buffer has no process")
	(let* ((pmark (process-mark proc))
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	       (intxt (if (>= (point) (marker-position pmark))
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			  (progn (if comint-eol-on-send (end-of-line))
				 (buffer-substring pmark (point)))
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			(let ((copy (funcall comint-get-old-input)))
			  (goto-char pmark)
			  (insert copy)
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			  copy)))
	       (input (if (not (eq comint-input-autoexpand 'input))
			  ;; Just whatever's already there
			  intxt
			;; Expand and leave it visible in buffer
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			(comint-replace-by-expanded-history t)
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			(buffer-substring pmark (point))))
	       (history (if (not (eq comint-input-autoexpand 'history))
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			    input
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			  ;; This is messy 'cos ultimately the original
			  ;; functions used do insertion, rather than return
			  ;; strings.  We have to expand, then insert back.
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			  (comint-replace-by-expanded-history t)
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			  (let ((copy (buffer-substring pmark (point))))
			    (delete-region pmark (point))
			    (insert input)
			    copy))))
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          (if comint-process-echoes
              (delete-region pmark (point))
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	    (insert ?\n))
	  (if (and (funcall comint-input-filter history)
		   (or (null comint-input-ignoredups)
		       (not (ring-p comint-input-ring))
		       (ring-empty-p comint-input-ring)
		       (not (string-equal (ring-ref comint-input-ring 0)
					  history))))
	      (ring-insert comint-input-ring history))
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	  (funcall comint-input-sentinel input)
	  (funcall comint-input-sender proc input)
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	  (setq comint-input-ring-index nil)
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	  (set-marker comint-last-input-start pmark)
	  (set-marker comint-last-input-end (point))
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	  (set-marker (process-mark proc) (point))
	  ;; A kludge to prevent the delay between insert and process output
	  ;; affecting the display.  A case for a comint-send-input-hook?
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	  (if (eq (process-filter proc) 'comint-output-filter)
	      (let ((functions comint-output-filter-functions))
		(while functions
		  (funcall (car functions) (concat input "\n"))
		  (setq functions (cdr functions)))))))))
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;; The purpose of using this filter for comint processes
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;; is to keep comint-last-input-end from moving forward
;; when output is inserted.
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(defun comint-output-filter (process string)
  ;; First check for killed buffer
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