Navigating multiline code blocks can cause IRB to crash and exit #239
Description
I am not sure if this is the right place to log this, should it be in the ruby/irb repo? Please let me know if this issue belongs anywhere else.
Description
Navigating multi-line code samples can cause IRB to crash. Using Ruby 3.0.0 with Reline 0.2.0
irb(main):001:0> irb_info
=>
Ruby version: 3.0.0
IRB version: irb 1.3.0 (2020-12-25)
InputMethod: ReidlineInputMethod with Reline 0.2.0
Steps to reproduce
- Install ruby 3.0.0 without readline so reline is used.
- Start
irb - Hit
" - Hit
enter/return - Hit
12
The prompt will look like this:
irb(main):001:0" "
irb(main):002:0> 12█
█ denoting the cursor position
- Hit the up arrow
↑
Observed behaviour
The cursor moves to the line above directly above where it was just placed.
The terminal will look like this:
irb(main):001:0" " █
irb(main):002:0" 12
- Hit the left arrow
←
💥 An exception is thrown and IRB exits with status code 1
irb(main):001:0" " /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline/unicode.rb:188:in `get_next_mbchar_size': undefined method `grapheme_clusters' for nil:NilClass (NoMethodError)
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline/line_editor.rb:1413:in `ed_next_char'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline/line_editor.rb:951:in `call'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline/line_editor.rb:951:in `wrap_method_call'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline/line_editor.rb:968:in `process_key'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline/line_editor.rb:1076:in `input_key'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline.rb:247:in `block (3 levels) in inner_readline'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline.rb:246:in `each'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline.rb:246:in `block (2 levels) in inner_readline'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline.rb:298:in `block in read_io'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline.rb:284:in `loop'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline.rb:284:in `read_io'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline.rb:245:in `block in inner_readline'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline.rb:243:in `loop'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline.rb:243:in `inner_readline'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/reline.rb:175:in `readmultiline'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/forwardable.rb:238:in `readmultiline'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/forwardable.rb:238:in `readmultiline'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb/input-method.rb:302:in `gets'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb.rb:519:in `block (2 levels) in eval_input'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb.rb:721:in `signal_status'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb.rb:518:in `block in eval_input'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb/ruby-lex.rb:202:in `lex'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb/ruby-lex.rb:174:in `block (2 levels) in each_top_level_statement'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb/ruby-lex.rb:171:in `loop'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb/ruby-lex.rb:171:in `block in each_top_level_statement'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb/ruby-lex.rb:170:in `catch'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb/ruby-lex.rb:170:in `each_top_level_statement'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb.rb:537:in `eval_input'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb.rb:472:in `block in run'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb.rb:471:in `catch'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb.rb:471:in `run'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/3.0.0/irb.rb:400:in `start'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/irb-1.3.0/exe/irb:11:in `<top (required)>'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/bin/irb:23:in `load'
from /Users/rickymcmillen/.rbenv/versions/3.0.0/bin/irb:23:in `<main>'
Expected behaviour
The cursor position is moved to the end of the line.
Ruby 2.7.2
This behaviour doesn't appear to be happening in Ruby version 2.7.2
The cursor is moved to the end of the line. Further navigation doesn't crash IRB.
irb(main):001:0" "█
irb(main):002:0" 12
irb(main):001:0> irb_info
=>
Ruby version: 2.7.2
IRB version: irb 1.2.6 (2020-09-14)
InputMethod: ReidlineInputMethod with Reline 0.1.5
Terminal Emulator
I have witnessed this happening in:
- iTerm2 build 3.4.3
- OSX Terminal Version 2.10 (433)