[ruby-core:98990] [Ruby master Bug#16510] irb crashes when hitting 'Home' or 'End' keys

Issue #16510 has been updated by [e-mail] (Yvo van Beek).


I noticed this issue when I'm connecting to my Ubuntu 20.04 server and I press Home or End in the Rails console. This is a new issue introduced with Ruby 2.7.0.

I'm using the macOS terminal and I had the Home key mapped to `\033[H` and the End key mapped to `\033[F`. Those key commands seem to crash the IRB (UndefinedConversionError).

Now that I'm using macOS Catalina with ZSH, I can use `\001` for Home and `\005` for End. That provides a workaround for this issue.
See https://apple.stackexchange.com/a/271648/192935 for more information on the key mappings.


----------------------------------------
Bug #16510: irb crashes when hitting 'Home' or 'End' keys
https://bugs.ruby-lang.org/issues/16510#change-86370

* Author: packerbacker89 (Josh Johnson)
* Status: Closed
* Priority: Normal
* ruby -v: 2.7.0
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
There were similar bugs opened in the past few months, but they all appear to be closed.

System: Ruby 2.7.0, reline 0.1.2, irb 1.2.1

Open irb and hit the 'Home' or 'End' key on the keyboard. This should go to the beginning / end of the line. Instead, the console crashes and the following traceback is provided:

```
	35: from /x/ruby-2.7.0/bin/irb:23:in `<main>'
	34: from /x/ruby-2.7.0/bin/irb:23:in `load'
	33: from /x/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/irb-1.2.1/exe/irb:11:in `<top (required)>'
	32: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:398:in `start'
	31: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:469:in `run'
	30: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:469:in `catch'
	29: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:470:in `block in run'
	28: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:535:in `eval_input'
	27: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb:134:in `each_top_level_statement'
	26: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb:134:in `catch'
	25: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb:135:in `block in each_top_level_statement'
	24: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb:135:in `loop'
	23: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb:138:in `block (2 levels) in each_top_level_statement'
	22: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb:166:in `lex'
	21: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:516:in `block in eval_input'
	20: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:693:in `signal_status'
	19: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:517:in `block (2 levels) in eval_input'
	18: from /x/ruby-2.7.0/lib/ruby/2.7.0/irb/input-method.rb:258:in `gets'
	17: from /x/ruby-2.7.0/lib/ruby/2.7.0/forwardable.rb:235:in `readmultiline'
	16: from /x/ruby-2.7.0/lib/ruby/2.7.0/forwardable.rb:235:in `readmultiline'
	15: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline.rb:170:in `readmultiline'
	14: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline.rb:232:in `inner_readline'
	13: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline.rb:232:in `loop'
	12: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline.rb:233:in `block in inner_readline'
	11: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline.rb:262:in `read_io'
	10: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline.rb:262:in `loop'
	 9: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline.rb:286:in `block in read_io'
	 8: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline.rb:234:in `block (2 levels) in inner_readline'
	 7: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline.rb:234:in `each'
	 6: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline.rb:235:in `block (3 levels) in inner_readline'
	 5: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline/line_editor.rb:829:in `input_key'
	 4: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline/line_editor.rb:787:in `normal_char'
	 3: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline/line_editor.rb:758:in `process_key'
	 2: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline/line_editor.rb:1109:in `ed_insert'
	 1: from /x/ruby-2.7.0/gems/reline-0.1.2/lib/reline/unicode.rb:70:in `get_mbchar_width'
/x/ruby-2.7.0/gems/reline-0.1.2/lib/reline/unicode.rb:70:in `encode': "\\xCF" from ASCII-8BIT to UTF-8 (Encoding::UndefinedConversionError)
```


In addition, hitting the 'Insert', 'Page Up', and 'Page Down' keys result in odd characters shown in the console (such as "`^[[2~`"). This is only a minor issue compared to the console crash.



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