vi-mode `r' crashes by multibyte string

[elfham]

Description

In vi-mode, `r' command crashes by editing multibyte string.

Steps to Reproduce

Environment:

• Ruby 2.7.2
  • IRB::VERSION = 1.2.8
  • Reline::VERSION = 0.1.10
• FreeBSD 12.2-RELEASE-p1
• PuTTYrv 0.74-ranvis
  • EAW of the terminal is Ambiguous=double (CJK)

Scenario:

Editing line from "あいう" to "あxう".

% irb
irb(main):001:0> "あいう"

The cursor is located at the second character, い.

Then type r, x .

Expected:

irb(main):001:0> "あxう"

Actual:

irb(main):001:0> "あTraceback (most recent call last):
        34: from /usr/local/bin/irb:23:in `<main>'
        33: from /usr/local/bin/irb:23:in `load'
        32: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/exe/irb:11:in `<top (required)>'
        31: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb.rb:400:in `start'
        30: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb.rb:471:in `run'
        29: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb.rb:471:in `catch'
        28: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb.rb:472:in `block in run'
        27: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb.rb:537:in `eval_input'
        26: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb/ruby-lex.rb:165:in `each_top_level_statement'
        25: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb/ruby-lex.rb:165:in `catch'
        24: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb/ruby-lex.rb:166:in `block in each_top_level_statement'
        23: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb/ruby-lex.rb:166:in `loop'
        22: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb/ruby-lex.rb:169:in `block (2 levels) in each_top_level_statement'
        21: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb/ruby-lex.rb:197:in `lex'
        20: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb.rb:518:in `block in eval_input'
        19: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb.rb:720:in `signal_status'
        18: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb.rb:519:in `block (2 levels) in eval_input'
        17: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.2.8/lib/irb/input-method.rb:294:in `gets'
        16: from /usr/local/lib/ruby/2.7/forwardable.rb:235:in `readmultiline'
        15: from /usr/local/lib/ruby/2.7/forwardable.rb:235:in `readmultiline'
        14: from /usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline.rb:176:in `readmultiline'
        13: from /usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline.rb:244:in `inner_readline'
        12: from /usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline.rb:244:in `loop'
        11: from /usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline.rb:246:in `block in inner_readline'
        10: from /usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline.rb:285:in `read_io'
         9: from /usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline.rb:285:in `loop'
         8: from /usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline.rb:331:in `block in read_io'
         7: from /usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline.rb:247:in `block (2 levels) in inner_readline'
         6: from /usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline.rb:247:in `each'
         5: from /usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline.rb:248:in `block (3 levels) in inner_readline'
         4: from /usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline/line_editor.rb:1071:in `input_key'
         3: from /usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline/line_editor.rb:1025:in `normal_char'
         2: from /usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline/line_editor.rb:984:in `process_key'
         1: from /usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline/line_editor.rb:2470:in `block in vi_replace_char'
/usr/local/lib/ruby/gems/2.7/gems/reline-0.1.10/lib/reline/line_editor.rb:2470:in `+': no implicit conversion of nil into String (TypeError)
%

Terminal Emulator

PuTTYrv 0.74-ranvis

[aycabta]

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