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2019-05-29
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<annoyed> emacs printing is so slow. pretty printing, printing long lines. i now can’t in practice use the dad-blasted[0] debugger because[1] its printing things internally. standing offer: 1% of my net worth to the person or persons who fix this, and yes i am serious and yes this is a legal contract </annoyed> [0] curse words bowdlerized [1] not actually an explanation, because i actually don’t know what the bug is. for years i could use the debugger, now i can’t.
@mfm Typical advice for slow printing is to clear the repl buffer cider-repl-clear-buffer
and then evaluate.
Is this the sayid
debugger, or the cider-debug-defn-at-point
debugger?
<annoyed, not at you> yeah i do cider-repl-clear-buffer
after almost every evaluation because i have to </annoyed>
i use cider-debug-defn-at-point
It sounds like you have some uncomfortably sized data, or have found a bug/limitation in CIDER/Emacs. I think they were talking about this issue in the #cider or #emacs channel last week. Good luck, it sounds a tricky one to solve.
<annoyed, not at you> it’s 10 megabytes of xml. peanuts. i can C-g to quit printing but not pathological font-locking (AFAICT). what the heck. for years i’ve sought a “`really-keyboard-quit`” for when C-g fails, and been told “C-g should work. if it doesn’t, it’s a bug.” there’s just no way that’s true. </annoyed>
thank you for listening. i like the philosophy “don’t wish it were easier, wish you were better,” but i’m still sensitive about the fact that my text editor can’t print arbitrarily-sized things fast. and sidenote: it got way better in nrepl 6. it’s emacs’s (not spacemacs’s, not nrepl’s or cider’s) fault.
I recall that font-locking can really slow down the output of very large data. I am also using a recent snapshot of Emacs, 27.0.50
which seems to be a bit faster but unsure if it will help in your case. Very stable though.
Is there a way to make Emacs only print to a REPL in a shell?
Can you elaborate? Are you running lein repl
in eshell and connecting to it from Emacs via cider-connect
?
No, cider-jack-in
And would be interested in running shell in iTerm to work around the slow printing issue
The only way I know is to run the REPL in the terminal and call functions with large output in there. You can either cider-connect or just use Emacs as an editor and reload the namespace in the terminal repl to pick up changes.