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From: Tom Wurgler
Subject: comint-local.el
Date: Tue, 12 Apr 2005 14:03:42 -0400 (EDT)

See comment section for purpose of this code.  Anybody have another way
of doing this?

Comments welcome.


;; Some comint additions.

;; The first defadvice sets comint-process-echoes for a local or remote
;; shell, that is whatever uses comint-send-input.  If the first input is
;; echoed, then it sets `comint-process-echoes' to t.  It only checks for
;; an echo the first time you run the routine.
;; The second one lets you type "clear" to get the effect of a system window
;; clear command.

(defvar comint-been-in-echoes-routine nil)
(make-variable-buffer-local 'comint-been-in-echoes-routine)

(defvar comint-dont-test-echo-regexp "password\\|login"
  "*Don't run the echo check defadvice if the characters on the line match this.
Default is not to run it for password or login prompts.")
(defadvice comint-send-input (after check-for-echoes activate)
  "Set `comint-process-echoes' if needed to stop echoes in a shell.
Don't run this check if characters on the line in front of the cursor contain
the regexp `comint-dont-test-echo-regexp', which see."
  (if (and (not comint-been-in-echoes-routine)
           (not (string-match comint-dont-test-echo-regexp
                                 (beginning-of-line) (point))
      (let ((laststring (buffer-substring-no-properties
                         (if (boundp 'comint-last-input-start)
                             (symbol-value 'comint-last-input-start))
                         (if (boundp 'comint-last-input-end)
                             (symbol-value 'comint-last-input-end)))))
        (sit-for .1)
          (if (search-backward (concat laststring laststring) nil t)
                (setq comint-process-echoes t)
                (if (string-match "telnet" (buffer-name))
                    (setq telnet-remote-echoes t))
                (forward-line 1)
                (kill-line 1)))
          (setq comint-been-in-echoes-routine t)))))

(defadvice comint-send-input (around allow-clear-command activate)
  (if (looking-back "clear")
        (kill-word -1)
        (forward-line 0)
        (delete-region 1 (point))

(defun looking-back (regexp)
  "Return t if text before point matches regular expression REGEXP.
This function modifies the match data that `match-beginning',
`match-end' and `match-data' access; save and restore the match
data if you want to preserve them."
    (let ((beg (point)))
      (if (re-search-backward regexp nil t)
          (if (= (match-end 0) beg)

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