Clearing eshell screen

Clearing eshell screen

[Timur Aydin]

Hi everybody,

How can I clear the eshell screen? A real clear though, not something
like the unix shells, where typing clear just scrolls the screen
upwards (kinda like sweeping the dirt under the carpet).

--
Timur

Re: Clearing eshell screen

[Kevin Rodgers]

Timur Aydin wrote:

> How can I clear the eshell screen? A real clear though, not something
> like the unix shells, where typing clear just scrolls the screen
> upwards (kinda like sweeping the dirt under the carpet).


M-x erase-buffer RET


-- 
<a href="mailto:&lt;kevinr&#64;ihs.com&gt;">Kevin Rodgers</a>

Re: Clearing eshell screen

[Oscar Fuentes]

Kevin Rodgers <kevinr@ihs.com> writes:

> Timur Aydin wrote:
> 
> > How can I clear the eshell screen? A real clear though, not something
> > like the unix shells, where typing clear just scrolls the screen
> > upwards (kinda like sweeping the dirt under the carpet).
> 
> 
> M-x erase-buffer RET

--- Emacs output

You have invoked the disabled command erase-buffer:
Delete the entire contents of the current buffer.
Any narrowing restriction in effect (see `narrow-to-region') is removed,
so the buffer is truly empty after this.


You can now type
Space to try the command just this once, but leave it disabled,
Y to try it and enable it (no questions if you use it again),
! to try it and enable all commands in this session, or
N to do nothing (command remains disabled).

<SPC pressed>

Text is read-only

<Buffer remains unaffected>

---- End of Emacs output

So far, the only way I know of discarding the eshell buffer contents
is exiting. For me (Emacs 21.1.1 on Win2k and Linux) eshell doesn't
honor the eshell-buffer-maximum-lines variable either, which is
dangerous, as some commands (ex. a gcc bootstrap) outputs tons of
text. Eventually, you end with an eshell buffer using several
megabytes of memory.

-- 
Oscar

Re: Clearing eshell screen

[Oscar Fuentes]

Oscar Fuentes <ofv@wanadoo.es> writes:

[snip]
> For me (Emacs 21.1.1 on Win2k and Linux) eshell doesn't
> honor the eshell-buffer-maximum-lines variable either
[snip]

Ooops! As the documentation says, adding 'eshell-truncate-buffer' to
'eshell-output-filter-functions' does the trick. Sorry.

Maybe this modification of 'eshell-truncate-buffer' is useful for the
OP:

(defun eshell-clears-buffer ()
  "Deletes the contents of eshell buffer, except the last prompt"
  (interactive)
  (save-excursion
    (goto-char eshell-last-output-end)
    (let ((lines (count-lines 1 (point)))
	  (inhibit-read-only t))
      (beginning-of-line)
      (let ((pos (point)))
	(if (bobp)
	    (if (interactive-p)
		(error "Buffer too short to truncate"))
	  (delete-region (point-min) (point))
	  (if (interactive-p)
	      (message "Buffer cleared")))))))

-- 
Oscar