* [ruby/irb] Update help message for next context-mode of 4

While here, fixing tab/space issues in help message, and sync
rdoc for IRB class to match the help message.

https://github.com/ruby/irb/commit/ef8e3901cc

* [ruby/irb] Do not continue line if last expression is an endless range

Fixes [Bug #14824]

https://github.com/ruby/irb/commit/63414f8465

* [ruby/irb] Add a test for not continuing when endless range at eol

https://github.com/ruby/irb/commit/1020ac9c65

* [ruby/irb] Make save-history extension safe for concurrent use

This makes the save-history extension check for modifications to
the history file before saving it.  If the history file was modified
after the history was loaded and before it was saved, append only
the new history lines to the history file.

This can result in more lines in the history file than SAVE_HISTORY
allows.  However, that will be fixed the next time irb is run and
the history is saved.

Fixes [Bug #13654]

https://github.com/ruby/irb/commit/041ef53845

* Fix errors when XDG_CONFIG_HOME points to non-writable directory

`$HOME/.config` is not writable on CI
because I think tests should not corrupt user's data.

And GitHub Actions CI sets `XDG_CONFIG_HOME`
since `Version: 20210309.1`.

https://github.com/ruby/actions/runs/2130811016?check_suite_focus=true#step:16:301
```
Errno::EACCES: Permission denied @ dir_s_mkdir - /home/runner/.config/irb
```

* Try to fix errors in TestIRB::TestHistory too

https://github.com/ruby/actions/runs/2137935523?check_suite_focus=true#step:9:562
```
  1) Error:
TestIRB::TestHistory#test_history_concurrent_use:
Errno::EACCES: Permission denied @ dir_s_mkdir - /home/runner/.config/irb
    /home/runner/work/actions/actions/ruby/lib/fileutils.rb:253:in `mkdir'
    /home/runner/work/actions/actions/ruby/lib/fileutils.rb:253:in `fu_mkdir'
    /home/runner/work/actions/actions/ruby/lib/fileutils.rb:231:in `block (2 levels) in mkdir_p'
    /home/runner/work/actions/actions/ruby/lib/fileutils.rb:229:in `reverse_each'
    /home/runner/work/actions/actions/ruby/lib/fileutils.rb:229:in `block in mkdir_p'
    /home/runner/work/actions/actions/ruby/lib/fileutils.rb:211:in `each'
    /home/runner/work/actions/actions/ruby/lib/fileutils.rb:211:in `mkdir_p'
    /home/runner/work/actions/actions/ruby/lib/irb/init.rb:355:in `rc_file_generators'
    /home/runner/work/actions/actions/ruby/lib/irb/init.rb:330:in `rc_file'
    /home/runner/work/actions/actions/ruby/test/irb/test_history.rb:170:in `block in assert_history'
    /home/runner/work/actions/actions/ruby/lib/tmpdir.rb:96:in `mktmpdir'
    /home/runner/work/actions/actions/ruby/test/irb/test_history.rb:168:in `assert_history'
    /home/runner/work/actions/actions/ruby/test/irb/test_history.rb:133:in `test_history_concurrent_use'
```

* [ruby/irb] Define "measure" command without forced override

https://github.com/ruby/irb/commit/9587ba13b5

* [ruby/irb] Add all lib files automatically

https://github.com/ruby/irb/commit/ecc82336b7

* [ruby/irb] Don't call Ruby 2.4+'s String#pretty_print

https://github.com/ruby/irb/commit/89bcf107be

* [ruby/irb] Implement ls command

https://github.com/ruby/irb/commit/19b6c20604

* [ruby/irb] Add whereami command

https://github.com/ruby/irb/commit/bc822e4aac

* [ruby/irb] Fix column overflow on ls output

https://github.com/ruby/irb/commit/6115754623

* [ruby/irb] Fix step's argument

cols.size was calling Integer#size, which returns 8.

Fixing a bug of https://github.com/ruby/irb/pull/209

https://github.com/ruby/irb/commit/c93ae4be71

* [ruby/irb] Deal with different screen sizes

e.g. http://rubyci.s3.amazonaws.com/centos8/ruby-master/log/20210321T063003Z.fail.html.gz

https://github.com/ruby/irb/commit/ddb3472ba2

* [ruby/irb] Have some right padding

instead of filling out an entire line

https://github.com/ruby/irb/commit/6ac8f45f5f

* Suppress verbose messages

Get rid of warnings in the parallel test.

```
unknown command: "Switch to inspect mode."
```

* [ruby/irb] Change ripper_lex_without_warning to a class method

https://github.com/ruby/irb/commit/d9f8abc17e

* [ruby/irb] Complete require and require_relative

https://github.com/ruby/irb/commit/1c61178b4c

* [ruby/reline] Add Reline.ungetc to control buffer

https://github.com/ruby/reline/commit/43ac03c624

* [ruby/reline] Reline.delete_text removes the current line in multiline

https://github.com/ruby/reline/commit/da90c094a1

* [ruby/reline] Support preposing and postposing for Reline.completion_proc

https://github.com/ruby/reline/commit/1f469de90c

* [ruby/reline] Suppress crashing when completer_{quote,word_break}_characters is empty

https://github.com/ruby/reline/commit/c6f1164942

* [ruby/irb] fix completion test when out-of-place build

* [ruby/irb] Cache completion files to require

https://github.com/ruby/irb/commit/612ebcb311

* [ruby/irb] Always add input method when calling Irb.new in tests

When passes input method as nil to Context.new through Irb.new,
ReidlineInputMethod.new is executed and the global internal state of Reline is
rewritten, therefore other tests are failed in the Ruby repository. This
commit changes to use TestInputMethod.

https://github.com/ruby/irb/commit/010dce9210

* [ruby/irb] Prevent the completion from crashing if rdoc is missing

There are cases where ruby is installed without rdoc and e.g.
lib/irb/cmd/help.rb also handles the LoadError

Here is how to replicate the issue:

```
$ docker run -it alpine:3.13.3 sh

/ # apk add ruby ruby-irb ruby-io-console

/ # irb

irb(main):001:0> Class[TAB][TAB]
```

And you end up with something like:

```
irb(main):001:0> ClassTraceback (most recent call last):
        34: from /usr/bin/irb:23:in `<main>'
        33: from /usr/bin/irb:23:in `load'
        32: from /usr/lib/ruby/gems/2.7.0/gems/irb-1.2.6/exe/irb:11:in `<top (required)>'
        31: from /usr/lib/ruby/2.7.0/irb.rb:400:in `start'
        30: from /usr/lib/ruby/2.7.0/irb.rb:471:in `run'
        29: from /usr/lib/ruby/2.7.0/irb.rb:471:in `catch'
        28: from /usr/lib/ruby/2.7.0/irb.rb:472:in `block in run'
        27: from /usr/lib/ruby/2.7.0/irb.rb:537:in `eval_input'
        26: from /usr/lib/ruby/2.7.0/irb/ruby-lex.rb:150:in `each_top_level_statement'
        25: from /usr/lib/ruby/2.7.0/irb/ruby-lex.rb:150:in `catch'
        24: from /usr/lib/ruby/2.7.0/irb/ruby-lex.rb:151:in `block in each_top_level_statement'
        23: from /usr/lib/ruby/2.7.0/irb/ruby-lex.rb:151:in `loop'
        22: from /usr/lib/ruby/2.7.0/irb/ruby-lex.rb:154:in `block (2 levels) in each_top_level_statement'
        21: from /usr/lib/ruby/2.7.0/irb/ruby-lex.rb:182:in `lex'
        20: from /usr/lib/ruby/2.7.0/irb.rb:518:in `block in eval_input'
        19: from /usr/lib/ruby/2.7.0/irb.rb:704:in `signal_status'
        18: from /usr/lib/ruby/2.7.0/irb.rb:519:in `block (2 levels) in eval_input'
        17: from /usr/lib/ruby/2.7.0/irb/input-method.rb:294:in `gets'
        16: from /usr/lib/ruby/2.7.0/forwardable.rb:235:in `readmultiline'
        15: from /usr/lib/ruby/2.7.0/forwardable.rb:235:in `readmultiline'
        14: from /usr/lib/ruby/2.7.0/reline.rb:175:in `readmultiline'
        13: from /usr/lib/ruby/2.7.0/reline.rb:238:in `inner_readline'
        12: from /usr/lib/ruby/2.7.0/reline.rb:238:in `loop'
        11: from /usr/lib/ruby/2.7.0/reline.rb:239:in `block in inner_readline'
        10: from /usr/lib/ruby/2.7.0/reline.rb:270:in `read_io'
         9: from /usr/lib/ruby/2.7.0/reline.rb:270:in `loop'
         8: from /usr/lib/ruby/2.7.0/reline.rb:311:in `block in read_io'
         7: from /usr/lib/ruby/2.7.0/reline.rb:240:in `block (2 levels) in inner_readline'
         6: from /usr/lib/ruby/2.7.0/reline.rb:240:in `each'
         5: from /usr/lib/ruby/2.7.0/reline.rb:241:in `block (3 levels) in inner_readline'
         4: from /usr/lib/ruby/2.7.0/reline/line_editor.rb:820:in `input_key'
         3: from /usr/lib/ruby/2.7.0/reline/line_editor.rb:608:in `complete'
         2: from /usr/lib/ruby/2.7.0/irb/completion.rb:269:in `block in <module:InputCompletor>'
         1: from /usr/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:92:in `require'
/usr/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:92:in `require': cannot load such file -- rdoc (LoadError)
```

https://github.com/ruby/irb/commit/a2d299c2ac

* [ruby/irb] Suppress verbose messages in the parallel test

`:VERBOSE` flag needs to be set prior to `IRB::Irb.new`.

https://github.com/ruby/irb/commit/78604682d9

* [ruby/irb] SIGINT should raise Interrupt after IRB session

https://github.com/ruby/irb/commit/5832cfe75b

* [ruby/irb] Colorize `__END__` as keyword

https://github.com/ruby/irb/commit/9b84018311

* [ruby/irb] Add show_source command

https://github.com/ruby/irb/commit/108cb04352

* [ruby/reline] Reset @rest_height when clear screen

https://github.com/ruby/reline/commit/3a7019b0d5

* [ruby/irb] process multi-line pastes as a single entity

this allows pasting leading-dot chained methods correctly:

```ruby
class A
  def a; self; end
  def b; true; end
end

a = A.new

a
 .a
 .b
```

will properly return `true` instead of erroring on the `.a` line:

```
irb(main):001:1*     class A
irb(main):002:1*       def a; self; end
irb(main):003:0>     end
irb(main):004:0*
irb(main):005:0>     a = A.new
irb(main):006:0*
irb(main):007:0>     a
irb(main):008:0>      .a
irb(main):009:0>      .a
=> #<A:0x00007f984211fbe8>
```

https://github.com/ruby/irb/commit/45aeb52575

* [ruby/irb] Add yamatanooroti test example

https://github.com/ruby/irb/commit/279155fcee

* [ruby/irb] Add test for multiline paste

https://github.com/ruby/irb/commit/e93c9cb54d

* [ruby/irb] Evaluate each toplevel statement

https://github.com/ruby/irb/commit/bc1b1d8bc3

* [ruby/irb] Version 1.3.5

https://github.com/ruby/irb/commit/22e2ddf715

* [ruby/reline] Version 0.2.5

https://github.com/ruby/reline/commit/22ce5651e5

Co-authored-by: Jeremy Evans <code@jeremyevans.net>
Co-authored-by: Kazuhiro NISHIYAMA <zn@mbf.nifty.com>
Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>
Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org>
Co-authored-by: Aleksandar Ivanov <aivanov92@gmail.com>
Co-authored-by: Koichi Sasada <ko1@atdot.net>
Co-authored-by: Cody Cutrer <cody@instructure.com>

* Get rid of inconsistent dll linkages against vcpkg readline

* [ruby/irb] Enhance colored inspect output

https://github.com/ruby/irb/commit/dffcdb5269

* [ruby/irb] Add color_printer.rb to gemspec

https://github.com/ruby/irb/commit/b4df0fd8b2

* [ruby/irb] Fix failing tests

https://github.com/ruby/irb/commit/7723ade899

* irb: add more syntax errors colorizing support (#3967)

* [ruby/irb] Do not colorize partially-correct inspect

This is to prevent a yellow-mixed output for ActiveSupport::TimeWithZone.

Follows up https://github.com/ruby/irb/pull/159 and https://github.com/ruby/ruby/pull/3967.

https://github.com/ruby/irb/commit/a5804c3560bb1de3ea8e40002635bff87f6a2825

* [ruby/irb] Remove unnecessary ignore_error in dispatch_seq

Just forgotten in https://github.com/ruby/irb/commit/a5804c3560bb1de3ea8e40002635bff87f6a2825

https://github.com/ruby/irb/commit/e42e548793

* Increase timeout for reline with --jit-wait

for failures like:
http://ci.rvm.jp/logfiles/brlog.trunk-mjit-wait.20201229-130509
http://ci.rvm.jp/logfiles/brlog.trunk-mjit-wait.20201229-165132
http://ci.rvm.jp/logfiles/brlog.trunk-mjit-wait.20201228-015519

* [ruby/irb] Stringify when a non-object is passed to PP#text

If a nested object is passed to #pp, it may be sometimes passed to the #text
method as an object without being stringified.

This is fixed on the Ruby main repository;
https://github.com/ruby/ruby/commit/433a3be86a811de0b4adbb92e054ee3a6fc6b4d8
but it was a bug of Ripper so still needs this workaround for using irb
as a gem on Ruby 3.0.0 or earlier.

Co-authored-by: k0kubun <takashikkbn@gmail.com>

https://github.com/ruby/irb/commit/8d13df22ee

* [ruby/irb] Newline in oneliner def doesn't reset indent

This closes ruby/irb#132.

https://github.com/ruby/irb/commit/43456dcf5e

* [ruby/irb] Escape invalid byte sequence in Exception

This fixes ruby/irb#141.

https://github.com/ruby/irb/commit/0815317d42

* [ruby/irb] Handle indentations related to keyword "do" correctly

This fixes ruby/irb#158.

https://github.com/ruby/irb/commit/964643400b

* [ruby/irb] Heredoc may contain multiple newlines in a single token

Use the start token as the indentation criteria so that it works properly in
heredoc.

ref. https://github.com/ruby/reline/pull/242

https://github.com/ruby/irb/commit/9704808dfd

* [ruby/irb] Use Ripper::Lexer#scan to take broken tokens

ref. https://github.com/ruby/reline/pull/242

https://github.com/ruby/irb/commit/54f90cb6c9

* [ruby/irb] Use error tokens if there are no correct tokens in the same place

For example, the broken code "%www" will result in only one error token.

https://github.com/ruby/irb/commit/9fa39a7cf3

* [ruby/irb] Ensure to restore $VERBOSE

https://github.com/ruby/irb/commit/cef474a76a

* 600x larger timeout for Reline

I didn't notice it's msec. 2.5s is too short.
http://ci.rvm.jp/results/trunk-mjit-wait@phosphorus-docker/3311385

* [ruby/irb] fix typo in `IRB::Irb#convert_invalid_byte_sequence`

https://github.com/ruby/irb/commit/d09d3c3d68

* [ruby/irb] do not escape a predicate method for doc namespace

* Fixes #88

https://github.com/ruby/irb/commit/d431a30af4

* [ruby/irb] refactoring an error handling in `IRB::Inspector`

* moved rescue clause to `#inspect_value` to catch all failures in inspectors
* test with all (currently five kind of) inspect modes
  - tweaked the input due to only `Marshal` can inspect(dump) a `BasicObject`

https://github.com/ruby/irb/commit/9d112fab8e

* [ruby/irb] Use Exception#full_message to show backtrace in the correct order

[Bug #17466]

https://github.com/ruby/irb/commit/1c76845cca

* [ruby/irb] Fix BACK_TRACE_LIMIT logic

https://github.com/ruby/irb/commit/30dc5d43fe

* irb: Drop lines from backtrace for tests in Ruby repository

* [ruby/reline] Update cursor correctly when just cursor moving

This fixes ruby/reline#236 and ruby/reline#239.

https://github.com/ruby/reline/commit/3e3c89d00b

* [ruby/reline] Correct var names in Reline were different from vi-*-mode-string

https://github.com/ruby/reline/commit/8255fc93b9

* [ruby/reline] Remove debug print

https://github.com/ruby/reline/commit/d7fbaedc6a

* [ruby/reline] Suppress crashing when auto_indent_proc returns broken indent info

Co-authored-by: Juanito Fatas <me@juanitofatas.com>

https://github.com/ruby/reline/commit/7c24276275

* [ruby/reline] Suppress crashing when dynamic_prompt_proc returns a broken prompt list

Co-authored-by: Juanito Fatas <me@juanitofatas.com>

https://github.com/ruby/reline/commit/558f7be168

* [ruby/reline] Suppress auto indent for adding newlines in pasting

Co-authored-by: Juanito Fatas <me@juanitofatas.com>

https://github.com/ruby/reline/commit/074bb017a7

* [ruby/reline] Add acknowledgments and license for rb-readline

https://github.com/ruby/reline/commit/19df59b916

* [ruby/irb] Fix comment, irb gem supports 2.5.0 or older

https://github.com/ruby/irb/commit/36118015ba

* should use `assert_include` here.

Random ordering test can introduce antoher candidate so it should be
`assert_include`.

* [ruby/irb] Add missing require

This is useful if you want to use IRB::ColorPrinter as a library like:

```
begin
  require 'irb/color_printer'
  IRB::ColorPrinter.pp(obj)
rescue LoadError
  pp(obj)
end
```

https://github.com/ruby/irb/commit/f8461691c7

* [ruby/irb] Make IRB::ColorPrinter.pp compatible with PP.pp

The incompatible interface is not helpful, again if you want to use it
as a standalone library, falling it back to PP.

Original PP.pp also ends with `out << "\n"`.

https://github.com/ruby/irb/commit/4c74c7d84c

* Suppress constant redefinition warnings

* Fix the failing test with XDG_CONFIG_HOME

* [ruby/irb] Version 1.3.1

https://github.com/ruby/irb/commit/c230d08911

* [ruby/reline] Handle ed_search_{prev,next}_history in multiline correctly

The current line was being handled incorrectly when displaying the hit
history, so it has been fixed to be correct.

https://github.com/ruby/reline/commit/a3df4343b3

* [ruby/reline] Move the cursor correctly when deleting at eol

This fixes ruby/reline#246.

https://github.com/ruby/reline/commit/07a73ba601

* [ruby/reline] Version 0.2.1

https://github.com/ruby/reline/commit/a3b3c6ee60

* [ruby/reline] Initialize a variable just in case

https://github.com/ruby/reline/commit/29b10f6e98

* [ruby/reline] Tests with yamatanooroti don't need chdir

Because of chdir, log files ware created in temporary directries on Windows.

https://github.com/ruby/reline/commit/200b469a68

* [ruby/reline] Windows needs more times to wait rendering

https://github.com/ruby/reline/commit/53ff2b09c7

* [ruby/reline] Support for change in Windows-specific behavior at eol

The behavior of automatically moving the cursor to the next line when
displaying a char at the eol on Windows suddenly disappeared.

https://github.com/ruby/reline/commit/cad4de6ee8

* [ruby/reline] Reline::Windows.erase_after_cursor erases attributes too

https://github.com/ruby/reline/commit/68b961dfc7

* [ruby/irb] [ruby/irb] [ruby/reline] Version 0.2.2

https://github.com/ruby/reline/commit/dfb710946f

https://github.com/ruby/irb/commit/1a1cdf9628

https://github.com/ruby/irb/commit/fe99faf8bd

* [ruby/irb] handle `__ENCODING__` as a keyword as well

https://github.com/ruby/irb/commit/a6a33d908f

* [ruby/irb] handle repeated exception separately

https://github.com/ruby/irb/commit/fcf6b34bc5

* [ruby/irb] skip a failling test on TruffleRuby

* due to the difference of backtrace pointed out by @aycabta

https://github.com/ruby/irb/commit/5e00a0ae61

* [ruby/irb] Version 1.3.2

https://github.com/ruby/irb/commit/a7699026cc

Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org>
Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>
Co-authored-by: Nobuhiro IMAI <nov@yo.rim.or.jp>
Co-authored-by: Koichi Sasada <ko1@atdot.net>
Co-authored-by: Hiroshi SHIBATA <hsbt@ruby-lang.org>

https://github.com/ruby/irb/commit/3ea9fd9ed0

nobu-san reviewed,

https://github.com/ruby/irb/pull/106#pullrequestreview-423400033
> How about lexer = Ripper::Lexer.new(";\n#{code}", nil, 0)?
> Encoding pragma is effective only at the beginning.
> And the semicolon and newline will be skipped because the position is before
> the initial pos.

I employ the way.

Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org>

https://github.com/ruby/irb/commit/e593cc65b7

https://github.com/ruby/irb/commit/6a457edbd1

Co-authored-by: Kazuhiro NISHIYAMA <zn@mbf.nifty.com>

like pry