bug#1496: 23.0.60; comint-delete-output should copy region to the kill ring

[barry]

comint-delete-output uses delete-region instead of kill-region because the
latter sets this-command.  Still, comint-delete-output should copy the killed
region to the kill ring so that it can be conveniently yanked into other
buffers.  A use case:

I use bzr diff in a shell buffer to get the changes in my working directory.
I'd like to copy that output directly into an email or a pastebin buffer.
With comint-delete-output's current behavior I can't use C-c C-o because the
output is thrown away.  By adding a call to copy-region-as-kill, I can now go
to my mail buffer and hit C-y to paste the diff output.

Here's a better definition of comint-delete-output:

(defun comint-delete-output ()
  "Delete all output from interpreter since last input.
Does not delete the prompt."
  (interactive)
  (let ((proc (get-buffer-process (current-buffer)))
        (replacement nil)
        (inhibit-read-only t))
    (save-excursion
      (let ((pmark (progn (goto-char (process-mark proc))
                          (forward-line 0)
                          (point-marker))))
        ;; Add the text to the kill ring.
        (copy-region-as-kill comint-last-input-end pmark)
        (delete-region comint-last-input-end pmark)
        (goto-char (process-mark proc))
        (setq replacement (concat "*** output flushed ***\n"
                                  (buffer-substring pmark (point))))
        (delete-region pmark (point))))
    ;; Output message and put back prompt
    (comint-output-filter proc replacement)))

The only difference is the addition of the comment and the call to
copy-region-as-kill.



In GNU Emacs 23.0.60.1 (i486-pc-linux-gnu, GTK+ Version 2.14.3)
 of 2008-10-13 on rothera, modified by Debian
 (emacs-snapshot package, version 1:20081013-1)
Windowing system distributor `The X.Org Foundation', version 11.0.10502000
configured using `configure  '--build' 'i486-linux-gnu' '--host' 
'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' 
'--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' 
'--mandir=/usr/share/man' '--with-pop=yes' 
'--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.60/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.60/site-lisp:/usr/share/emacs/site-lisp'
 '--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=i486-linux-gnu' 
'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g 
-O2' 'LDFLAGS=-g -Wl,--as-needed' 'CPPFLAGS=''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Elisp

Minor modes in effect:
  shell-dirtrack-mode: t
  delete-selection-mode: t
  icomplete-mode: t
  show-paren-mode: t
  savehist-mode: t
  rcirc-track-minor-mode: t
  global-whitespace-mode: t
  desktop-save-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

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