[ruby/reline] Overhaul io gate structure

(https://github.com/ruby/reline/pull/666)

* Overhaul IO gate structure

1. Move IO related classes to `lib/reline/io/` directory.
2. Rename `GeneralIO` to `Dumb`.
3. Use IO classes as instances instead of classes.

* Update lib/reline/io/ansi.rb

Co-authored-by: tomoya ishida <tomoyapenguin@gmail.com>

---------

https://github.com/ruby/reline/commit/dc1518e1ac

Co-authored-by: tomoya ishida <tomoyapenguin@gmail.com>

6 files changed, 29 insertions, 26 deletions

diff --git a/test/reline/helper.rb b/test/reline/helper.rb
index 26fe834482..a5f850e838 100644
--- a/test/reline/helper.rb
+++ b/test/reline/helper.rb
@@ -22,29 +22,36 @@ module Reline
   class <<self
     def test_mode(ansi: false)
       @original_iogate = IOGate
-      remove_const('IOGate')
-      const_set('IOGate', ansi ? Reline::ANSI : Reline::GeneralIO)
+
       if ENV['RELINE_TEST_ENCODING']
         encoding = Encoding.find(ENV['RELINE_TEST_ENCODING'])
       else
         encoding = Encoding::UTF_8
       end
-      @original_get_screen_size = IOGate.method(:get_screen_size)
-      IOGate.singleton_class.remove_method(:get_screen_size)
-      def IOGate.get_screen_size
-        [24, 80]
+
+      if ansi
+        new_io_gate = ANSI.new
+        # Setting ANSI gate's screen size through set_screen_size will also change the tester's stdin's screen size
+        # Let's avoid that side-effect by stubbing the get_screen_size method
+        new_io_gate.define_singleton_method(:get_screen_size) do
+          [24, 80]
+        end
+        new_io_gate.define_singleton_method(:encoding) do
+          encoding
+        end
+      else
+        new_io_gate = Dumb.new(encoding: encoding)
       end
-      Reline::GeneralIO.reset(encoding: encoding) unless ansi
+
+      remove_const('IOGate')
+      const_set('IOGate', new_io_gate)
       core.config.instance_variable_set(:@test_mode, true)
       core.config.reset
     end
 
     def test_reset
-      IOGate.singleton_class.remove_method(:get_screen_size)
-      IOGate.define_singleton_method(:get_screen_size, @original_get_screen_size)
       remove_const('IOGate')
       const_set('IOGate', @original_iogate)
-      Reline::GeneralIO.reset
       Reline.instance_variable_set(:@core, nil)
     end
 
@@ -146,7 +153,7 @@ class Reline::TestCase < Test::Unit::TestCase
       expected.bytesize, byte_pointer,
       <<~EOM)
         <#{expected.inspect} (#{expected.encoding.inspect})> expected but was
-        <#{chunk.inspect} (#{chunk.encoding.inspect})> in <Terminal #{Reline::GeneralIO.encoding.inspect}>
+        <#{chunk.inspect} (#{chunk.encoding.inspect})> in <Terminal #{Reline::Dumb.new.encoding.inspect}>
       EOM
   end
 
diff --git a/test/reline/test_ansi_with_terminfo.rb b/test/reline/test_ansi_with_terminfo.rb
index e1c56b9ee1..3adda10716 100644
--- a/test/reline/test_ansi_with_terminfo.rb
+++ b/test/reline/test_ansi_with_terminfo.rb
@@ -1,7 +1,7 @@
 require_relative 'helper'
-require 'reline/ansi'
+require 'reline'
 
-class Reline::ANSI::TestWithTerminfo < Reline::TestCase
+class Reline::ANSI::WithTerminfoTest < Reline::TestCase
   def setup
     Reline.send(:test_mode, ansi: true)
     @config = Reline::Config.new
diff --git a/test/reline/test_ansi_without_terminfo.rb b/test/reline/test_ansi_without_terminfo.rb
index 3d153514f3..2db14cf0a0 100644
--- a/test/reline/test_ansi_without_terminfo.rb
+++ b/test/reline/test_ansi_without_terminfo.rb
@@ -1,7 +1,7 @@
 require_relative 'helper'
-require 'reline/ansi'
+require 'reline'
 
-class Reline::ANSI::TestWithoutTerminfo < Reline::TestCase
+class Reline::ANSI::WithoutTerminfoTest < Reline::TestCase
   def setup
     Reline.send(:test_mode, ansi: true)
     @config = Reline::Config.new
diff --git a/test/reline/test_config.rb b/test/reline/test_config.rb
index 03e4178f32..8c4b513600 100644
--- a/test/reline/test_config.rb
+++ b/test/reline/test_config.rb
@@ -85,15 +85,13 @@ class Reline::Config::Test < Reline::TestCase
 
   def test_encoding_is_ascii
     @config.reset
-    Reline.core.io_gate.reset(encoding: Encoding::US_ASCII)
+    Reline.core.io_gate.instance_variable_set(:@encoding, Encoding::US_ASCII)
     @config = Reline::Config.new
 
     assert_equal true, @config.convert_meta
   end
 
   def test_encoding_is_not_ascii
-    @config.reset
-    Reline.core.io_gate.reset(encoding: Encoding::UTF_8)
     @config = Reline::Config.new
 
     assert_equal nil, @config.convert_meta
diff --git a/test/reline/test_line_editor.rb b/test/reline/test_line_editor.rb
index 7a38ecd596..1859da8199 100644
--- a/test/reline/test_line_editor.rb
+++ b/test/reline/test_line_editor.rb
@@ -4,14 +4,12 @@ require 'stringio'
 
 class Reline::LineEditor
   class RenderLineDifferentialTest < Reline::TestCase
-    module TestIO
-      RESET_COLOR = "\e[0m"
-
-      def self.move_cursor_column(col)
+    class TestIO < Reline::IO
+      def move_cursor_column(col)
         @output << "[COL_#{col}]"
       end
 
-      def self.erase_after_cursor
+      def erase_after_cursor
         @output << '[ERASE]'
       end
     end
@@ -24,7 +22,7 @@ class Reline::LineEditor
       @line_editor.instance_variable_set(:@screen_size, [24, 80])
       @line_editor.instance_variable_set(:@output, @output)
       Reline.send(:remove_const, :IOGate)
-      Reline.const_set(:IOGate, TestIO)
+      Reline.const_set(:IOGate, TestIO.new)
       Reline::IOGate.instance_variable_set(:@output, @output)
     ensure
       $VERBOSE = verbose
diff --git a/test/reline/test_reline.rb b/test/reline/test_reline.rb
index a20a5c9f44..c664ab74b0 100644
--- a/test/reline/test_reline.rb
+++ b/test/reline/test_reline.rb
@@ -375,7 +375,7 @@ class Reline::Test < Reline::TestCase
   def test_dumb_terminal
     lib = File.expand_path("../../lib", __dir__)
     out = IO.popen([{"TERM"=>"dumb"}, Reline.test_rubybin, "-I#{lib}", "-rreline", "-e", "p Reline.core.io_gate"], &:read)
-    assert_equal("Reline::GeneralIO", out.chomp)
+    assert_match(/#<Reline::Dumb/, out.chomp)
   end
 
   def test_require_reline_should_not_trigger_winsize
@@ -389,7 +389,7 @@ class Reline::Test < Reline::TestCase
       require("reline") && p(Reline.core.io_gate)
     RUBY
     out = IO.popen([{}, Reline.test_rubybin, "-I#{lib}", "-e", code], &:read)
-    assert_equal("Reline::ANSI", out.chomp)
+    assert_include(out.chomp, "Reline::ANSI")
   end
 
   def win?