Bug #7859

Readline: Incorrect arrow key behavior in vi_editing_mode insert mode with Readline 6.2

Added by David Albert about 1 year ago. Updated 12 months ago.

Assignee:Kouji Takao
Target version:next minor
ruby -v:2.0.0-rc2 Backport:


I've discovered what I think is a bug in the (({Readline})) module in the standard library. When I am using (({vieditingmode})) in insert mode (rather than command mode), I am unable to use the up arrow to go up through history. It seems that I can only go up through history when in command mode. Additionally, pressing the down arrow while in insert mode changes to command mode, which seems odd.

Perhaps this is intended behavior for the (({Readline})) module, but if it is, I would propose changing it. I would expect the up and down arrows to scroll up and down through history in both command mode and insert mode when (({Readline.vieditingmode?})) is true. You can find examples of the expected behavior in bash (((%set -o vi%)) to get into vi mode), the Python REPL, and all other that I can remember using.

I've reproduced this with (({Readline})) 6.2 on Mac OS X 10.8.2 and Ubuntu precise64 with kernel version 3.2.0-37. It is worth noting that on Mac OS X with the EditLine wrapper, the (({Readline})) module works correctly although you must have the proper settings in your .editrc file because (({Readline.vieditingmode})) is not implemented.

Here is the code I used to test:

# readlinetest.rb
require 'readline'

trap(:INT) {
exit 0

puts "Readline::VERSION => #{Readline::VERSION}"

loop do
puts Readline.readline(">> ", true)

Example usage:

$ ruby readlinetest.rb
Readline::VERSION => 6.2


At this point, I would expect that the up arrow would put 1234 after the prompt, but instead nothing happens. Pressing the down arrow is the same as pressing escape and changes (({readline})) into command mode.

Let me know if there's anything else I can provide to help fix this. I tried jumping into the (({Readline})) module myself, but I'm not particularly familiar with how (({readline})) works and wasn't able to make much headway.


#1 Updated by Nobuyoshi Nakada about 1 year ago

  • Description updated (diff)
  • Category set to ext
  • Status changed from Open to Assigned
  • Assignee set to Kouji Takao
  • Target version set to next minor

#2 Updated by Richard Michael 12 months ago

I have different, but perhaps related, problems with Readline.vieditingmode in Ruby 1.9.3p392 with MacPorts' readline 6.2 on MacOS 10.6.8. Please let me know if I should open a new 1.9.3 bug report instead of commenting here.

Using the readlinetest.rb program in the above report, any arrow key jumps back to the first line of history and prints it's escape sequence, and ESC itself jumps back to the first line of history. (It seems the initial escape sequence, either generated by an arrow-key or ESC itself, is printing the first line.)

$ ruby tmp/readlinetest.rb
Readline::VERSION => 6.2

one[A # Up-arrow was pressed here, on the empty line; down-arrow would print ">> one[B", right-arrow ">> one[B", etc.

$ ruby tmp/readlinetest.rb
Readline::VERSION => 6.2

one # ESC was pressed here, on the empty line.

$ find $MYRUBYHOME -name readline.bundle -exec otool -L {} \;
/Users/testuser/.rvm/rubies/ruby-1.9.3-p392/lib/libruby.1.9.1.dylib (compatibility version 1.9.1, current version 1.9.1)
/opt/local/lib/libreadline.6.2.dylib (compatibility version 6.0.0, current version 6.2.0)
/opt/local/lib/libncurses.5.dylib (compatibility version 5.0.0, current version 5.0.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 125.2.11)
/usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 227.0.0)

Also available in: Atom PDF