pasting in multiline irb is slow

[nachokb]

Tried to paste a 31-lines snippet to compare a specific benchmark (anon module's #inspect was incredibly slow in < 2.7.0).

What I found is that 2.7.0's irb is unbearably slow to paste even these small snippet.

This is a comparison between Ruby 2.4.3 with pry 0.11.0 and Ruby 2.7.0-preview3 with irb 1.1.0:

https://youtu.be/c9ENYX8VVHA

I did some other tests:

1. ruby-2.4.3 with irb-0.9.6 and ruby-2.7.0-preview3 with irb-1.1.0 --legacy: absolutely instantaneous;
2. ruby-2.4.3 with pry-0.11.0: almost instantaneous (I assume parsing for syntax highlighting takes some time); watch video above;
3. ruby-2.7.0 with irb-1.1.0 and irb-1.2.0 (multiline mode): unbearably slow;

[olliebennett]

I have the same issue with multiline. An additional observation is that the "paste speed" slows even more as the whole payload is gradually pasted.

=> irb --version
irb 1.2.1 (2019-12-24)
=> ruby --version
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin18]

I'm using;

• Mac OS Mojave 10.14.6 (18G87) on MacBook Pro (13-inch, 2018)
• the default Terminal app
• zsh as my shell
• ruby managed via rbenv

Below is code that I see appear progressively slower on the screen with each line, when pasted in a single paste action. It takes ~12 seconds to completely paste this into the console.

my_hash = {
  'id1' => { a: 'foo', b: 'bar' },
  'id2' => { a: 'foo', b: 'bar' },
  'id3' => { a: 'foo', b: 'bar' },
  'id4' => { a: 'foo', b: 'bar' },
  'id5' => { a: 'foo', b: 'bar' },
  'id6' => { a: 'foo', b: 'bar' },
  'id7' => { a: 'foo', b: 'bar' },
  'id8' => { a: 'foo', b: 'bar' },
  'id10' => { a: 'foo', b: 'bar' },
  'id11' => { a: 'foo', b: 'bar' },
  'id12' => { a: 'foo', b: 'bar' },
  'id13' => { a: 'foo', b: 'bar' },
  'id14' => { a: 'foo', b: 'bar' },
  'id15' => { a: 'foo', b: 'bar' },
  'id16' => { a: 'foo', b: 'bar' },
  'id17' => { a: 'foo', b: 'bar' },
  'id18' => { a: 'foo', b: 'bar' },
  'id19' => { a: 'foo', b: 'bar' },
  'id20' => { a: 'foo', b: 'bar' }
}

The same full paste operation is instantaneous when using pre-multiline versions of irb (such as 1.0.0, or when running irb --nomultiline.

Workaround

For me, passing --nomultiline wasn't an option as I was running IRB via the Rails console. The configuration can be configured via an .irbrc file instead;

# Disable 'mutliline' support due to poor pasting performance
# see https://github.com/ruby/irb/issues/43
IRB.conf[:USE_MULTILINE] = false

[fmluizao]

I have the same problem... ruby 2.6 is almost instantaneous, 2.7 very slow, seems like each char is inputted individually.

I'm using Linux + Bash + rvm.

[tfreedman]

I've managed to reproduce this as well (iTerm2 on 10.14), except for me it alternates between pasting very slowly one character at a time (this bug) or crashing IRB entirely (#46) (and trying to run the paste commands in bash, which is super dangerous). This currently makes Ruby 2.7 completely useless for me, as I can't easily change the IRB version back to 0.9.6 and can't use any 2.7 consoles.

[rubyFeedback]

I believe the issue is known upstream.

[kaspergrubbe]

@rubyFeedback Is it logged anywhere?

[ileri]

Coloring and auto indenting is wonderful, but pasting something is very slow, its pasting character by character. When I want to interperet something long, switching to pry.

[StevenHarlow]

Just posting to reaffirm that this is an issue for me as well, and is preventing the company I work for from upgrading to 2.7.0.

[svl7]

Experiencing similar issues, sometimes strings don't get pasted completely, even crashing irb with usually something like /usr/share/rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/ansi.rb:76:in 'block in cursor_pos': undefined method 'pre_match' for nil:NilClass (NoMethodError)

Workaround from @olliebennett seems to help.

[StevenHarlow]

Is this something that will be fixed in any minor versions of 2.7, or with 3.0? It really breaks a lot of the way I do things with the console (copy pasting json into variables to execute on). Is there a way to turn off this syntax highlighting?

[aycabta]

@StevenHarlow swrobel/dotfiles@020485a

[pond]

2.6.6 vs 2.7.1 irb just on localhost is dreadfully slow.

https://www.youtube.com/watch?v=gFHGwKzHY-4

Even with single line things like puts "1", if I paste those in blocks with a keyboard shortcut and hold it down for autorepeat (as at the start of the video above, but with the multiline string excluded) then IRB under Ruby 2.7 is visibly much slower and, after I let go of the keyboard shortcut, keeps pasting for ages as the terminal is miles behind the keyboard buffer.

It's 2020 with multi-GHz CPUs and we can't input characters into a terminal near-instantaneously? Something ain't right ;-)

[Faisal-nfl]

@olliebennett workaround solved it for me.
by default rails c does not load any other .irbrc but from the current user's home (~).

so there are 2 ways

1. create a file in current user's home (~)

   cd ~ to go to current user's home (~)
   run vim .irbrc to create/open file
   add this line IRB.conf[:USE_MULTILINE] = false
   press ESC to enter command mode
   enter command :wq! to save and exit

2. tell application.rb file to load .irbrc from projects root folder
   create a .irbrc file in projects root with text IRB.conf[:USE_MULTILINE] = false
   tell application.rb to use this file instead using

load .irbrc file

def load_console(app=self)
  super
  if File.exists?(project_specific_irbrc = File.join(Rails.root, ".irbrc"))
    puts "Loading project specific .irbrc ..."
    load(project_specific_irbrc)
  end
end

[leoarnold]

I sometimes have to paste the content of a spreadsheet column into IRB (don't ask why ... please, don't 😖 ). With about 200 rows it takes way to long with syntax highlighting on.

Thanks @Faisal-nfl for the workaround! That helped me out for now.

I think that highlighting and multiline are a great addition to IRB and I hope we can find a way to get it up to speed in the future.

[prashantvithani]

I use interactive_editor. Not that it's a solution, but a quick work around to avoid the delay.

> require 'interactive_editor'
> vim # other editors are also supported
> # --- paste snippet in the opened editor and :wq. 
> # The file gets required automatically on save, hence the script gets executed.