Elpy: [Question] Clear Python Shell Buffer

[azzamsa]

I saw another issue https://github.com/jorgenschaefer/elpy/issues/1204.

But, Is there any default keybinding or something like M-x clear-elpy-shell-buffer ?

I don't find such feature in the docs. Or am I miss something ?

Thanks for this great package. :)

[galaunay]

There is no default keybinding nor elpy function to do that.
But this is something we can think about implementing.

Would the following function do what you want ?

(defun elpy-shell-clear-shell ()
  "Clear the current shell buffer."
  (interactive)
  (with-current-buffer (process-buffer (elpy-shell-get-or-create-process))
    (comint-clear-buffer)))

[azzamsa]

@galaunay. Thanks a lot. Work like a charm. :)

Thanks.

[ghost]

@jorgenschaefer @galaunay

I am also looking for a bash like clear function to clear my python shell. I added this to my init.el file

(defun elpy-shell-clear-shell ()
  "Clear the current shell buffer."
  (interactive)
  (with-current-buffer (process-buffer (elpy-shell-get-or-create-process))
    (comint-clear-buffer)))

When I tried M-x elpy-shell-clear-shell it gives this error symbol's function definition is void: comint-clear-buffer. What do I do now?

[azzamsa]

@potholiday it works for me. Sounds like you invoke it when no python prompt exists. I got the same error last week when I tried to invoke non-existent prompt

[ghost]

@azzamsa Can you plz tell me the steps you took to get it to work. Mine still not working?

[azzamsa]

Sure. this is my elpy config.

[ghost]

My init.el Emac24

;;Elpy
(package-initialize)
(elpy-enable)

(defun elpy-shell-clear-shell ()
  "Clear the current shell buffer."
  (interactive)
  (with-current-buffer (process-buffer (elpy-shell-get-or-create-process))
    (comint-clear-buffer)))

Cant seems to find what I am doing wrong here. If it helps I always do a line by line execution of python Send Region to python

[galaunay]

if comint-clear-buffer is not defined, you can try this:

;;Elpy
(package-initialize)
(elpy-enable)
(require 'comint)

(defun elpy-shell-clear-shell ()
  "Clear the current shell buffer."
  (interactive)
  (with-current-buffer (process-buffer (elpy-shell-get-or-create-process))
    (comint-clear-buffer)))

[ghost]

Still not working. In order to avoid any confusion (if any) I am looking for a clear function like this https://upload.wikimedia.org/wikipedia/commons/0/0f/Clear-gnulinux.gif . For emacs insted of clear , M-x elpy-shell-clear-shell

[azzamsa]

Ehsell already had clear support.

I think binding elpy-shell-clear-shell to key is faster than typing 'clear'.

[galaunay]

We are on the same page about the clear function.

I don't know when comint-clear-buffer has been implemented, could you give us some information about your Emacs version ?

You can also try the following function, that does not rely on comint-clear-buffer:

(defun elpy-shell-clear-shell ()
  "Clear the current shell buffer."
  (interactive)
  (with-current-buffer (process-buffer (elpy-shell-get-or-create-process))
    (let ((comint-buffer-maximum-size 0))
      (comint-truncate-buffer))))

[ghost]

@galaunay Thank you that worked. My version is Emacs 24.5.1

[azzamsa]

Apart from elpy-shell-clear-shell. You can clear inferior-python buffer using comint-clear-buffer which bound to C-c M-o.