Can I clean the repl?
Solution 1
If you want to clear the current namespace of all temporary variables and functions you declared you can use this one liner (or make a function of it) :
(map #(ns-unmap *ns* %) (keys (ns-interns *ns*)))
or
(ns myutil)
(defn ns-clean
"Remove all internal mappings from a given name space or the current one if no parameter given."
([] (ns-clean *ns*))
([ns] (map #(ns-unmap ns %) (keys (ns-interns ns)))))
(ns mytest)
... make loads of junk ...
(myutil/ns-clean)
... great!!! I can now make all new junk ...
It does not claim to give you a squeaky clean namespace, just one with less of the junk which usually accumulates in a typical repl session.
Use with caution : do not pull the rug from under your feet!
Solution 2
If you are running the repl through a terminal window (eg: Terminal.app on MacOS or xterm/aterm/urxvt etc on linux) then you can type Control-L and it should clear the terminal window and give you a new repl prompt. However all macros/atoms you previously defined are still going to be in memory, so this is just a "Cosmetic" clear.
Solution 3
In EMACS/slime REPLs C-c C-o clears the last output (in case you've typed something that gave a very long answer) C-c M-o clears the whole thing
In GNOME terminals, you've got a menu option Terminal/Reset and Clear
Solution 4
The shorcut to clean the whole buffer : C-u C-c C-o
The shortcut to clean the last output : C-c C-o
Note, the old way was : C-c M-o
Also, cider-repl-clear-buffer
(which is bound to C-ENTER s-c on my machine)
Solution 5
If you are using Emacs + nREPL
, you can either:
- Run Mx
nrepl-clear-buffer
or - Run Cc Mo
If the key binding is not enabled, run Mxnrepl-interaction-mode
to enable it. You can find other useful shortcuts in nrepl.el and/or customize the key bindings to fit your needs.
Note: you can find all nREPL
's key bindings in your system by running M-x v
nrepl-mode-map
and following the nrepl.el
link.
Belun
Updated on June 06, 2022Comments
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Belun almost 2 years
I have played with a lot of code in a repl console, how can I clear it? I would like a fresh one without restarting it. Can that be done?
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Belun over 13 yearsthe initial question was about cosmetically clearing the repl. later i realized that clearing could also mean something else :)
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Belun over 13 yearsthanks. i was thinking about just getting rid of the text in the console... you put new light into it
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johnbakers over 10 yearsNote that C-c M-o does not erase any work actually interpreted by the REPL already, it just clears the screen. Any definitions are still there.
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Travis Rodman about 8 yearsThis is an amazing answer in search of the right question.