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Limit implicit show
in REPL to printing 20 KiB by default
#53959
Conversation
Do you have an example of how this looks in practice? |
Yeah, here is the example from the tests. julia> using REPL
julia> REPL.SHOW_MAXIMUM_BYTES = 1000
1000
julia> struct A40735
str::String
end
julia> str = string(('a':'z')...)^40
"abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijk" ⋯ 499 bytes ⋯ "qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"
julia> A40735(str)
A40735("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdeError showing value of type A40735:
ERROR: REPL.LimitIOException: aborted printing after attempting to `show` more than 1000 bytes of data in the REPL.
Stacktrace:
[1] write
@ ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:385 [inlined]
[2] write
@ ./io.jl:450 [inlined]
[3] write
@ ./io.jl:869 [inlined]
[4] print
@ ./char.jl:252 [inlined]
[5] escape_string(io::IOContext{REPL.LimitIO{IOContext{Base.TTY}}}, s::String, esc::Tuple{Char, Char}; keep::Tuple{})
@ Base ./strings/io.jl:424
[6] escape_string
@ ./strings/io.jl:416 [inlined]
[7] print_quoted
@ ./strings/io.jl:450 [inlined]
[8] show(io::IOContext{REPL.LimitIO{IOContext{Base.TTY}}}, s::String)
@ Base ./strings/io.jl:197
[9] _show_default(io::IOContext{REPL.LimitIO{IOContext{Base.TTY}}}, x::Any)
@ Base ./show.jl:496
[10] show_default
@ ./show.jl:479 [inlined]
[11] show
@ ./show.jl:474 [inlined]
[12] show(io::IOContext{REPL.LimitIO{IOContext{Base.TTY}}}, ::MIME{Symbol("text/plain")}, x::A40735)
@ Base.Multimedia ./multimedia.jl:47
[13] (::REPL.var"#68#69"{REPL.REPLDisplay{LineEditREPL}, MIME{Symbol("text/plain")}, Base.RefValue{Any}})(io::Any)
@ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:413
[14] with_repl_linfo(f::Any, repl::LineEditREPL)
@ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:709
[15] display(d::REPL.REPLDisplay, mime::MIME{Symbol("text/plain")}, x::Any)
@ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:395
[16] display
@ ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:418 [inlined]
[17] display(x::Any)
@ Base.Multimedia ./multimedia.jl:340
[18] #invokelatest#2
@ ./essentials.jl:1030 [inlined]
[19] invokelatest
@ ./essentials.jl:1027 [inlined]
[20] print_response(errio::IO, response::Any, show_value::Bool, have_color::Bool, specialdisplay::Union{…})
@ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:455
[21] (::REPL.var"#70#71"{LineEditREPL, Pair{Any, Bool}, Bool, Bool})(io::Any)
@ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:424
[22] with_repl_linfo(f::Any, repl::LineEditREPL)
@ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:709
[23] print_response(repl::AbstractREPL, response::Any, show_value::Bool, have_color::Bool)
@ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:422
[24] (::REPL.var"#do_respond#93"{…})(s::REPL.LineEdit.MIState, buf::Any, ok::Bool)
@ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:1051
[25] #invokelatest#2
@ ./essentials.jl:1030 [inlined]
[26] invokelatest
@ ./essentials.jl:1027 [inlined]
[27] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
@ REPL.LineEdit ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2747
[28] run_frontend(repl::LineEditREPL, backend::REPL.REPLBackendRef)
@ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:1476
[29] (::REPL.var"#75#81"{LineEditREPL, REPL.REPLBackendRef})()
@ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:526
Some type information was truncated. Use `show(err)` to see complete types. BTW, as discussed in the issue, this is a kind of last-resort fallback. The "correct" answer is for objects to implement reasonable |
BTW, at the very end of the printing, there's [...]tuvwxyzabcdeError showing value of type A40735:
ERROR: REPL.LimitIOException: aborted printing after attempting to `show` more than 1000 bytes of data in the REPL. I wonder if I should write a [...]tuvwxyzabcde
Error showing value of type A40735:
ERROR: REPL.LimitIOException: aborted printing after attempting to `show` more than 1000 bytes of data in the REPL. |
Throwing from the REPL with a big stacktrace into the guts of it doesn't seem very useful to the user. |
What would you suggest? |
Stop printing and then print something in the end about printing being stopped, or? |
That sounds like a better idea. I just pushed a commit, with that I get julia> A40735(str)
A40735("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcde…[printing stopped after 1000 displaying bytes] (ends with I did not change the default from 100k bytes, but since this is less disruptive we could probably bring it down. |
bump |
I just pushed a commit to lower the limit to 20KiB, since that seemed high enough to not be hit too often by accident, but low enough to be more useful: julia> A40735(str^100)
A40735("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz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stopped after displaying 20.000 KiB] That's about 9 screens of wrapped text in 23-line-tall, 103-column wide vscode editor window on my laptop |
Co-authored-by: Jameson Nash <vtjnash@gmail.com>
thanks for taking a look @vtjnash, I believe I've addressed your comments |
closes #40735 --------- Co-authored-by: Jameson Nash <vtjnash@gmail.com>
I'm very much not a fan of this. Most of my REPL output is > 20KiB. I'd be ok with switching to a pager at this output size (with a quick keyboard shortcut to continue or interrupt), but forcing me to retype something just to get my output is not nice. |
At the very least commands that are expected to produce large outputs (e.g. the various |
Is 20KiB just too low? 1MiB? |
I would complain a lot less about 1 MiB. |
I think the goal here is to use a limit where it becomes unequivocally overwhelming, so making that change seems reasonable to me. |
I regularly dump GiBs worth of text into my REPL and search through it, but I'm probably weird. |
do you dump it into your REPL by the REPL's implicit |
Implicit show |
Could also advertise the env var for people like Keno in the error message?
|
I think raising the limit to 1MiB and advertising the env var is good (although I don't like to set env vars to make sure I get the default user experience, but that's a me problem). I still think an interactive pager that lets user make the choice in the moment would be best, but that's more effort of course. |
Currently there's no env var btw, it's a global value in the REPL module |
Ah ok. Maybe that should be a repl-specific option like
|
I'm not sure how you're hitting this, since Examplejulia> REPL.SHOW_MAXIMUM_BYTES = 1
1
julia> "hi"
"h…[printing stopped after displaying 1 byte; call `show(stdout, MIME"text/plain"(), ans)` to print without truncation]
julia> @code_warntype 1+1+1
MethodInstance for +(::Int64, ::Int64, ::Int64)
from +(a, b, c, xs...) @ Base operators.jl:642
Arguments
#self#::Core.Const(+)
a::Int64
b::Int64
c::Int64
xs::Core.Const(())
Body::Int64
1 ─ nothing
│ %2 = Base.afoldl::Core.Const(Base.afoldl)
│ %3 = Base.:+::Core.Const(+)
│ %4 = Base.:+::Core.Const(+)
│ %5 = (a + b)::Int64
│ %6 = (%4)(%5, c)::Int64
│ %7 = Core.tuple(%3, %6)::Tuple{typeof(+), Int64}
│ %8 = Core._apply_iterate(Base.iterate, %2, %7, xs)::Int64
└── return %8
Do you mind giving an MWE? Would be happy to try to exempt things in addition to raising the default output, but I'm not sure which objects are actually relevant. |
BTW, it takes me 37-40s to print 1MiB with REPL.SHOW_MAXIMUM_BYTES = 1_048_576
struct A40735
str::String
end
str = string(('a':'z')...)^50
@time REPL.show_limited(stdout, MIME"text/plain"(), A40735(str^1000)); in VSCode, iterm, and the built-in terminal on my m1 macbook pro (or 46s without the |
29s for me. m2 mac iTerm2 |
Not sure if it matters much, but about 4s for me. |
closes #40735