* [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>

* [ruby/irb] Stub a screen size for tests

https://github.com/ruby/irb/commit/6663057083

* [ruby/irb] Support GitHub Actions

https://github.com/ruby/irb/commit/8e9e6c4037

* [ruby/irb] Stub a screen size for test_context

http://ci.rvm.jp/logfiles/brlog.trunk-random1.20210119-074232

https://github.com/ruby/irb/commit/ea87592d4a

* [ruby/irb] Use a real screen size for pp by default

https://github.com/ruby/irb/commit/9b9300dec2

* [ruby/irb] Rescue Errno::EINVAL on IRB pp

http://rubyci.s3.amazonaws.com/solaris11-gcc/ruby-master/log/20210119T070008Z.log.html.gz
is caused by:

/export/home/chkbuild/chkbuild-gcc/tmp/build/20210119T150010Z/ruby/lib/reline/ansi.rb:157:in `winsize': Invalid argument - <STDIN> (Errno::EINVAL)
        from /export/home/chkbuild/chkbuild-gcc/tmp/build/20210119T150010Z/ruby/lib/reline/ansi.rb:157:in `get_screen_size'
        from /export/home/chkbuild/chkbuild-gcc/tmp/build/20210119T150010Z/ruby/lib/reline.rb:168:in `get_screen_size'
        from /export/home/chkbuild/chkbuild-gcc/tmp/build/20210119T150010Z/ruby/lib/forwardable.rb:238:in `get_screen_size'
        from /export/home/chkbuild/chkbuild-gcc/tmp/build/20210119T150010Z/ruby/lib/irb/color_printer.rb:7:in `pp'
        from -e:1:in `<main>'

https://github.com/ruby/irb/commit/1719514598

* [ruby/irb] Split test files for IRB::Color and IRB::ColorPrinter

https://github.com/ruby/irb/commit/d95e8daab3

* [ruby/irb] Undefine unused constants

https://github.com/ruby/irb/commit/eea9c16804

* [ruby/irb] Remove pp-specific stub from TestColor

because it was for TestColorPrinter

https://github.com/ruby/irb/commit/7569206fd4

* [ruby/irb] Delete a doodle-level memo comment...

https://github.com/ruby/irb/commit/fc3e1d9e0c

* [ruby/irb] Indent correctly with keyword "for" and "in"

https://github.com/ruby/irb/commit/47c83ea724

* [ruby/irb] Indent correctly with method calling with receiver

https://github.com/ruby/irb/commit/e7c68e74a0

* [ruby/irb] add `IRB::FileInputMethod.open` to ensure closing associated File

* tweak some methods not to raise exception after `#close`
* use it in `IRB::IrbLoader#{source_file,load_file}

https://github.com/ruby/irb/commit/ec2947acbd

* [ruby/irb] use `RubyLex::TerminateLineInput` appropriately [Bug #17564]

* using the appropriciate exception instead of `break` so that the session
  can be continue after the `irb_source` and `irb_load` commands
* suppress extra new line due to one more `#prompt` call

https://github.com/ruby/irb/commit/bdefaa7cfd

* [ruby/irb] specify the `VERBOSE` to `false` and fix tests to fit

https://github.com/ruby/irb/commit/502c590925

* In test, need to pass a context to IRB::WorkSpace.new explicitly

* Fix absolute path predicate on Windows

A path starts with '/' is not an absolute path on Windows, because
of drive letter or UNC.

* [ruby/irb] follow up the actual line number

https://github.com/ruby/irb/commit/7aed8fe3b1

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

https://github.com/ruby/irb/commit/adbba19adf

* [ruby/irb] Allow "measure" command to take block

https://github.com/ruby/irb/commit/20f1ca23e9

* [ruby/irb] Enable to reassign a new block with "measure" command

https://github.com/ruby/irb/commit/b444573aa2

* [ruby/reline] Cache pasting state in processing a key

Because it's too slow.

The rendering time in IRB has been reduced as follows:

  start = Time.now

  def each_top_level_statement
    initialize_input
    catch(:TERM_INPUT) do
      loop do
        begin
          prompt
          unless l = lex
            throw :TERM_INPUT if @line == ''
          else
            @line_no += l.count("\n")
            next if l == "\n"
            @line.concat l
            if @code_block_open or @ltype or @continue or @indent > 0
              next
            end
          end
          if @line != "\n"
            @line.force_encoding(@io.encoding)
            yield @line, @exp_line_no
          end
          break if @io.eof?
          @line = ''
          @exp_line_no = @line_no

          @indent = 0
        rescue TerminateLineInput
          initialize_input
          prompt
        end
      end
    end
  end

  puts "Duration: #{Time.now - start} seconds"

0.22sec -> 0.14sec

https://github.com/ruby/reline/commit/b8b3dd52c0

* [ruby/reline] Initialize uninitialized variables in tests

https://github.com/ruby/reline/commit/25af4bb64b

* [ruby/reline] Remove an unused variable

https://github.com/ruby/reline/commit/123ea51166

* [ruby/reline] Scroll down when ^C is pressed

https://github.com/ruby/reline/commit/6877a7e3f5

* [ruby/reline] Show all lines higher than the screen when finished

On Unix-like OSes, logs prior to the screen are not editable. When the code
is higher than the screen, the code is only shown on the screen until input
is finished, but when it is finished, all lines are outputted.

https://github.com/ruby/reline/commit/8cd9132a39

* [ruby/reline] Handle past logs correctly when the code is higher than the screen

https://github.com/ruby/reline/commit/f197139b4a

* [ruby/reline] Update cursor info by inserting newline even if not in pasting

https://github.com/ruby/reline/commit/92d314f514

* [ruby/reline] Move cursor just after the last line when finished

https://github.com/ruby/reline/commit/ba06e4c480

* [ruby/reline] The vi_histedit supports multiline

This closes ruby/reline#253.

https://github.com/ruby/reline/commit/f131f86d71

* [ruby/reline] Autowrap correctly when inserting chars in the middle of a line

https://github.com/ruby/reline/commit/ebaf37255f

* [ruby/reline] Terminate correctly in the middle of lines higher than the screen

https://github.com/ruby/reline/commit/e1d9240ada

* [ruby/irb] Version 1.3.3

https://github.com/ruby/irb/commit/4c87035b7c

* [ruby/reline] Version 0.2.3

https://github.com/ruby/reline/commit/b26c7d60c8

Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>
Co-authored-by: Nobuhiro IMAI <nov@yo.rim.or.jp>
Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org>
Co-authored-by: ima1zumi <mariimaizumi5@gmail.com>

This fixes --inf-ruby-mode.

https://github.com/ruby/irb/commit/0e4a818955

Omit the results evaluated at assignment if they are too long.

The behavior of ECHO_ON_ASSIGNMENT being on by default is hard to understand,
so I change it to off by default. Instead, we turn OMIT_ON_ASSIGNMENT on by
default. The result is displayed on assignment, but it will always be short
and within one line of the screen.

https://github.com/ruby/irb/commit/c5ea79d5ce

https://github.com/ruby/irb/commit/be2937abd5

https://github.com/ruby/irb/commit/420e7d2270

https://github.com/ruby/irb/commit/cdbb9dfc9f

https://github.com/ruby/irb/commit/a6fe58e916

This reverts commit 2b0b19b87c60d2cdb329979acbb96e12a1f940e7.

New IRB parser needs new Ripper what has lex_state too. The new Ripper is
adopted by Ruby 2.5 or later.

https://github.com/ruby/irb/commit/9ab6e35a2c