[ruby/reline] Introduce a new class Reline::Face to configure

character attributes
(https://github.com/ruby/reline/pull/552)

* Reine::Face

* fix test_yamatanooroti

* Define singleton methods to make accessors to attributes of a face

* s/display/foreground/

* s/default/default_style/ && s/normal_line/default/ && s/enhanced_line/enhanced/

* fix typo

* FaceConfig.new now takes keyword arguments

* Update lib/reline/face.rb

Co-authored-by: Stan Lo <stan001212@gmail.com>

* Update test/reline/test_face.rb

Co-authored-by: Stan Lo <stan001212@gmail.com>

* Fix to correspond to frozen_string_literal

* Face::FaceConfig -> Face::Config

* ref https://github.com/ruby/reline/pull/552#pullrequestreview-1677282576

* delete unused ivar

* ref https://github.com/ruby/reline/pull/552#discussion_r1358783723

* insert "\e[0m" into all SGR

* tiny fix

* ESSENTIAL_DEFINE_NAMES

ref https://github.com/ruby/reline/pull/552#discussion_r1367722247

* Change to Hash-accessor style

- Reline::Face[:completion_dialog].enhanced ->
  Reline::Face[:completion_dialog][:enhanced]
- Reline::Face.configs shows all defined values

* Cache array method call in local variable

* Tests for Face configuration variations

* resolve https://github.com/ruby/reline/pull/552#pullrequestreview-1710938154

* amend  to

* check invalid SGR parameter in :style

* The order of define values should be preserved

* Update test/reline/test_face.rb

Co-authored-by: Stan Lo <stan001212@gmail.com>

* Update test/reline/test_face.rb

Co-authored-by: Stan Lo <stan001212@gmail.com>

* Add methods: load_initial_config and reset_to_initial_config. And teardown in tests

* omission in amending "style: :default" to "style: :reset"

* refs https://github.com/ruby/reline/issues/598

* Fix link

* amend method name

* Update lib/reline/face.rb

Co-authored-by: ima1zumi <52617472+ima1zumi@users.noreply.github.com>

---------

https://github.com/ruby/reline/commit/fdc1d3b1e5

Co-authored-by: Stan Lo <stan001212@gmail.com>
Co-authored-by: ima1zumi <52617472+ima1zumi@users.noreply.github.com>

8 files changed, 582 insertions, 82 deletions

diff --git a/doc/reline/face.md b/doc/reline/face.md
new file mode 100644
index 0000000000..cf3bb69440
--- /dev/null
+++ b/doc/reline/face.md
@@ -0,0 +1,108 @@
+# Face
+
+With the `Reline::Face` class, you can modify the text color and text decorations in your terminal emulator.
+This is primarily used to customize the appearance of the method completion dialog in IRB.
+
+## Usage
+
+### ex: Change the background color of the completion dialog cyan to blue
+
+```ruby
+Reline::Face.config(:completion_dialog) do |conf|
+  conf.define :default, foreground: :white, background: :blue
+  #                                                     ^^^^^ `:cyan` by default
+  conf.define :enhanced, foreground: :white, background: :magenta
+  conf.define :scrollbar, foreground: :white, background: :blue
+end
+```
+
+If you provide the above code to an IRB session in some way, you can apply the configuration.
+It's generally done by writing it in `.irbrc`.
+
+Regarding `.irbrc`, please refer to the following link: [https://docs.ruby-lang.org/en/master/IRB.html](https://docs.ruby-lang.org/en/master/IRB.html)
+
+## Available parameters
+
+`Reline::Face` internally creates SGR (Select Graphic Rendition) code according to the block parameter of `Reline::Face.config` method.
+
+| Key         | Value             | SGR Code (numeric part following "\e[")|
+|:------------|:------------------|-----:|
+| :foreground | :black            | 30   |
+|             | :red              | 31   |
+|             | :green            | 32   |
+|             | :yellow           | 33   |
+|             | :blue             | 34   |
+|             | :magenta          | 35   |
+|             | :cyan             | 36   |
+|             | :white            | 37   |
+|             | :bright_black     | 90   |
+|             | :gray             | 90   |
+|             | :bright_red       | 91   |
+|             | :bright_green     | 92   |
+|             | :bright_yellow    | 93   |
+|             | :bright_blue      | 94   |
+|             | :bright_magenta   | 95   |
+|             | :bright_cyan      | 96   |
+|             | :bright_white     | 97   |
+| :background | :black            | 40   |
+|             | :red              | 41   |
+|             | :green            | 42   |
+|             | :yellow           | 43   |
+|             | :blue             | 44   |
+|             | :magenta          | 45   |
+|             | :cyan             | 46   |
+|             | :white            | 47   |
+|             | :bright_black     | 100  |
+|             | :gray             | 100  |
+|             | :bright_red       | 101  |
+|             | :bright_green     | 102  |
+|             | :bright_yellow    | 103  |
+|             | :bright_blue      | 104  |
+|             | :bright_magenta   | 105  |
+|             | :bright_cyan      | 106  |
+|             | :bright_white     | 107  |
+| :style      | :reset            | 0    |
+|             | :bold             | 1    |
+|             | :faint            | 2    |
+|             | :italicized       | 3    |
+|             | :underlined       | 4    |
+|             | :slowly_blinking  | 5    |
+|             | :blinking         | 5    |
+|             | :rapidly_blinking | 6    |
+|             | :negative         | 7    |
+|             | :concealed        | 8    |
+|             | :crossed_out      | 9    |
+
+- The value for `:style` can be both a Symbol and an Array
+    ```ruby
+      # Single symbol
+      conf.define :default, style: :bold
+      # Array
+      conf.define :default, style: [:bold, :negative]
+    ```
+- The availability of specific SGR codes depends on your terminal emulator
+- You can specify a hex color code to `:foreground` and `:background` color like `foreground: "#FF1020"`. Its availability also depends on your terminal emulator
+
+## Debugging
+
+You can see the current Face configuration by `Reline::Face.configs` method
+
+Example:
+
+```ruby
+irb(main):001:0> Reline::Face.configs
+=>
+{:default=>
+  {:default=>{:style=>:reset, :escape_sequence=>"\e[0m"},
+   :enhanced=>{:style=>:reset, :escape_sequence=>"\e[0m"},
+   :scrollbar=>{:style=>:reset, :escape_sequence=>"\e[0m"}},
+ :completion_dialog=>
+  {:default=>{:foreground=>:white, :background=>:cyan, :escape_sequence=>"\e[0m\e[37;46m"},
+   :enhanced=>{:foreground=>:white, :background=>:magenta, :escape_sequence=>"\e[0m\e[37;45m"},
+   :scrollbar=>{:foreground=>:white, :background=>:cyan, :escape_sequence=>"\e[0m\e[37;46m"}}}
+```
+
+## Backlog
+
+- Support for 256-color terminal emulator. Fallback hex color code such as "#FF1020" to 256 colors
+
diff --git a/lib/reline.rb b/lib/reline.rb
index 3d1716c81b..fb19982081 100644
--- a/lib/reline.rb
+++ b/lib/reline.rb
@@ -7,6 +7,7 @@ require 'reline/key_stroke'
 require 'reline/line_editor'
 require 'reline/history'
 require 'reline/terminfo'
+require 'reline/face'
 require 'rbconfig'
 
 module Reline
@@ -36,10 +37,8 @@ module Reline
   DialogRenderInfo = Struct.new(
     :pos,
     :contents,
-    :bg_color,
-    :pointer_bg_color,
-    :fg_color,
-    :pointer_fg_color,
+    :face,
+    :bg_color, # For the time being, this line should stay here for the compatibility with IRB.
     :width,
     :height,
     :scrollbar,
@@ -260,10 +259,7 @@ module Reline
         contents: result,
         scrollbar: true,
         height: [15, preferred_dialog_height].min,
-        bg_color: 46,
-        pointer_bg_color: 45,
-        fg_color: 37,
-        pointer_fg_color: 37
+        face: :completion_dialog
       )
     }
     Reline::DEFAULT_DIALOG_CONTEXT = Array.new
@@ -606,4 +602,6 @@ else
   io
 end
 
+Reline::Face.load_initial_configs
+
 Reline::HISTORY = Reline::History.new(Reline.core.config)
diff --git a/lib/reline/face.rb b/lib/reline/face.rb
new file mode 100644
index 0000000000..b78f3b1ca5
--- /dev/null
+++ b/lib/reline/face.rb
@@ -0,0 +1,157 @@
+# frozen_string_literal: true
+
+class Reline::Face
+  SGR_PARAMETERS = {
+    foreground: {
+      black: 30,
+      red: 31,
+      green: 32,
+      yellow: 33,
+      blue: 34,
+      magenta: 35,
+      cyan: 36,
+      white: 37,
+      bright_black: 90,
+      gray: 90,
+      bright_red: 91,
+      bright_green: 92,
+      bright_yellow: 93,
+      bright_blue: 94,
+      bright_magenta: 95,
+      bright_cyan: 96,
+      bright_white: 97
+    },
+    background: {
+      black: 40,
+      red: 41,
+      green: 42,
+      yellow: 43,
+      blue: 44,
+      magenta: 45,
+      cyan: 46,
+      white: 47,
+      bright_black: 100,
+      gray: 100,
+      bright_red: 101,
+      bright_green: 102,
+      bright_yellow: 103,
+      bright_blue: 104,
+      bright_magenta: 105,
+      bright_cyan: 106,
+      bright_white: 107,
+    },
+    style: {
+      reset: 0,
+      bold: 1,
+      faint: 2,
+      italicized: 3,
+      underlined: 4,
+      slowly_blinking: 5,
+      blinking: 5,
+      rapidly_blinking: 6,
+      negative: 7,
+      concealed: 8,
+      crossed_out: 9
+    }
+  }.freeze
+
+  class Config
+    ESSENTIAL_DEFINE_NAMES = %i(default enhanced scrollbar).freeze
+    RESET_SGR = "\e[0m".freeze
+
+    def initialize(name, &block)
+      @definition = {}
+      block.call(self)
+      ESSENTIAL_DEFINE_NAMES.each do |name|
+        @definition[name] ||= { style: :reset, escape_sequence: RESET_SGR }
+      end
+    end
+
+    attr_reader :definition
+
+    def define(name, **values)
+      values[:escape_sequence] = format_to_sgr(values.to_a).freeze
+      @definition[name] = values
+    end
+
+    def [](name)
+      @definition.dig(name, :escape_sequence) or raise ArgumentError, "unknown face: #{name}"
+    end
+
+    private
+
+    def sgr_rgb(key, value)
+      return nil unless rgb_expression?(value)
+      case key
+      when :foreground
+        "38;2;"
+      when :background
+        "48;2;"
+      end + value[1, 6].scan(/../).map(&:hex).join(";")
+    end
+
+    def format_to_sgr(ordered_values)
+      sgr = "\e[" + ordered_values.map do |key_value|
+        key, value = key_value
+        case key
+        when :foreground, :background
+          case value
+          when Symbol
+            SGR_PARAMETERS[key][value]
+          when String
+            sgr_rgb(key, value)
+          end
+        when :style
+          [ value ].flatten.map do |style_name|
+            SGR_PARAMETERS[:style][style_name]
+          end.then do |sgr_parameters|
+            sgr_parameters.include?(nil) ? nil : sgr_parameters
+          end
+        end.then do |rendition_expression|
+          unless rendition_expression
+            raise ArgumentError, "invalid SGR parameter: #{value.inspect}"
+          end
+          rendition_expression
+        end
+      end.join(';') + "m"
+      sgr == RESET_SGR ? RESET_SGR : RESET_SGR + sgr
+    end
+
+    def rgb_expression?(color)
+      color.respond_to?(:match?) and color.match?(/\A#[0-9a-fA-F]{6}\z/)
+    end
+  end
+
+  private_constant :SGR_PARAMETERS, :Config
+
+  def self.[](name)
+    @configs[name]
+  end
+
+  def self.config(name, &block)
+    @configs ||= {}
+    @configs[name] = Config.new(name, &block)
+  end
+
+  def self.configs
+    @configs.transform_values(&:definition)
+  end
+
+  def self.load_initial_configs
+    config(:default) do |conf|
+      conf.define :default, style: :reset
+      conf.define :enhanced, style: :reset
+      conf.define :scrollbar, style: :reset
+    end
+    config(:completion_dialog) do |conf|
+      conf.define :default, foreground: :white, background: :cyan
+      conf.define :enhanced, foreground: :white, background: :magenta
+      conf.define :scrollbar, foreground: :white, background: :cyan
+    end
+  end
+
+  def self.reset_to_initial_configs
+    @configs = {}
+    load_initial_configs
+  end
+end
diff --git a/lib/reline/line_editor.rb b/lib/reline/line_editor.rb
index 0d990c2c0a..d71b903701 100644
--- a/lib/reline/line_editor.rb
+++ b/lib/reline/line_editor.rb
@@ -831,27 +831,24 @@ class Reline::LineEditor
       dialog.column = 0
       dialog.width = @screen_size.last
     end
+    face = Reline::Face[dialog_render_info.face || :default]
+    scrollbar_sgr = face[:scrollbar]
+    default_sgr = face[:default]
+    enhanced_sgr = face[:enhanced]
     dialog.contents = contents.map.with_index do |item, i|
-      if i == pointer
-        fg_color = dialog_render_info.pointer_fg_color
-        bg_color = dialog_render_info.pointer_bg_color
-      else
-        fg_color = dialog_render_info.fg_color
-        bg_color = dialog_render_info.bg_color
-      end
+      line_sgr = i == pointer ? enhanced_sgr : default_sgr
       str_width = dialog.width - (scrollbar_pos.nil? ? 0 : @block_elem_width)
       str = padding_space_with_escape_sequences(Reline::Unicode.take_range(item, 0, str_width), str_width)
-      colored_content = "\e[#{bg_color}m\e[#{fg_color}m#{str}"
+      colored_content = "#{line_sgr}#{str}"
       if scrollbar_pos
-        color_seq = "\e[37m"
         if scrollbar_pos <= (i * 2) and (i * 2 + 1) < (scrollbar_pos + bar_height)
-          colored_content + color_seq + @full_block
+          colored_content + scrollbar_sgr + @full_block
         elsif scrollbar_pos <= (i * 2) and (i * 2) < (scrollbar_pos + bar_height)
-          colored_content + color_seq + @upper_half_block
+          colored_content + scrollbar_sgr + @upper_half_block
         elsif scrollbar_pos <= (i * 2 + 1) and (i * 2) < (scrollbar_pos + bar_height)
-          colored_content + color_seq + @lower_half_block
+          colored_content + scrollbar_sgr + @lower_half_block
         else
-          colored_content + color_seq + ' ' * @block_elem_width
+          colored_content + scrollbar_sgr + ' ' * @block_elem_width
         end
       else
         colored_content
diff --git a/test/reline/helper.rb b/test/reline/helper.rb
index fb2262e7f5..4d0c883c86 100644
--- a/test/reline/helper.rb
+++ b/test/reline/helper.rb
@@ -4,6 +4,7 @@ ENV['TERM'] = 'xterm' # for some CI environments
 
 require 'reline'
 require 'test/unit'
+require 'test/unit/rr'
 
 begin
   require 'rbconfig'
diff --git a/test/reline/test_face.rb b/test/reline/test_face.rb
new file mode 100644
index 0000000000..371b4b0d2e
--- /dev/null
+++ b/test/reline/test_face.rb
@@ -0,0 +1,204 @@
+# frozen_string_literal: true
+
+require_relative 'helper'
+
+class Reline::Face::Test < Reline::TestCase
+  RESET_SGR = "\e[0m"
+
+  def teardown
+    Reline::Face.reset_to_initial_configs
+  end
+
+  class WithInsufficientSetupTest < self
+    def setup
+      Reline::Face.config(:my_insufficient_config) do |face|
+      end
+      @face = Reline::Face[:my_insufficient_config]
+    end
+
+    def test_my_insufficient_config_line
+      assert_equal RESET_SGR, @face[:default]
+      assert_equal RESET_SGR, @face[:enhanced]
+      assert_equal RESET_SGR, @face[:scrollbar]
+    end
+
+    def test_my_insufficient_configs
+      my_configs = Reline::Face.configs[:my_insufficient_config]
+      assert_equal(
+        {
+          default: { style: :reset, escape_sequence: RESET_SGR },
+          enhanced: { style: :reset, escape_sequence: RESET_SGR },
+          scrollbar: { style: :reset, escape_sequence: RESET_SGR }
+        },
+        my_configs
+      )
+    end
+  end
+
+  class WithSetupTest < self
+    def setup
+      Reline::Face.config(:my_config) do |face|
+        face.define :default, foreground: :blue
+        face.define :enhanced, foreground: "#FF1020", background: :black, style: [:bold, :underlined]
+      end
+      Reline::Face.config(:another_config) do |face|
+        face.define :another_label, foreground: :red
+      end
+      @face = Reline::Face[:my_config]
+    end
+
+    def test_now_there_are_four_configs
+      assert_equal %i(default completion_dialog my_config another_config), Reline::Face.configs.keys
+    end
+
+    def test_resetting_config_discards_user_defined_configs
+      Reline::Face.reset_to_initial_configs
+      assert_equal %i(default completion_dialog), Reline::Face.configs.keys
+    end
+
+    def test_my_configs
+      my_configs = Reline::Face.configs[:my_config]
+      assert_equal(
+        {
+          default: {
+            escape_sequence: "#{RESET_SGR}\e[34m", foreground: :blue
+          },
+          enhanced: {
+            background: :black,
+            foreground: "#FF1020",
+            style: [:bold, :underlined],
+            escape_sequence: "\e[0m\e[38;2;255;16;32;40;1;4m"
+          },
+          scrollbar: {
+            style: :reset,
+            escape_sequence: "\e[0m"
+          }
+        },
+        my_configs
+      )
+    end
+
+    def test_my_config_line
+      assert_equal "#{RESET_SGR}\e[34m", @face[:default]
+    end
+
+    def test_my_config_enhanced
+      assert_equal "#{RESET_SGR}\e[38;2;255;16;32;40;1;4m", @face[:enhanced]
+    end
+
+    def test_not_respond_to_another_label
+      assert_equal false, @face.respond_to?(:another_label)
+    end
+  end
+
+  class WithoutSetupTest < self
+    def test_my_config_default
+      Reline::Face.config(:my_config) do |face|
+        # do nothing
+      end
+      face = Reline::Face[:my_config]
+      assert_equal RESET_SGR, face[:default]
+    end
+
+    def test_style_does_not_exist
+      face = Reline::Face[:default]
+      assert_raise ArgumentError do
+        face[:style_does_not_exist]
+      end
+    end
+
+    def test_invalid_keyword
+      assert_raise ArgumentError do
+        Reline::Face.config(:invalid_config) do |face|
+          face.define :default, invalid_keyword: :red
+        end
+      end
+    end
+
+    def test_invalid_foreground_name
+      assert_raise ArgumentError do
+        Reline::Face.config(:invalid_config) do |face|
+          face.define :default, foreground: :invalid_name
+        end
+      end
+    end
+
+    def test_invalid_background_name
+      assert_raise ArgumentError do
+        Reline::Face.config(:invalid_config) do |face|
+          face.define :default, background: :invalid_name
+        end
+      end
+    end
+
+    def test_invalid_style_name
+      assert_raise ArgumentError do
+        Reline::Face.config(:invalid_config) do |face|
+          face.define :default, style: :invalid_name
+        end
+      end
+    end
+
+    def test_private_constants
+      [:SGR_PARAMETER, :Config, :CONFIGS].each do |name|
+        assert_equal false, Reline::Face.constants.include?(name)
+      end
+    end
+  end
+
+  class ConfigTest < self
+    def setup
+      @config = Reline::Face.const_get(:Config).new(:my_config) { }
+    end
+
+    def test_the_order_of_define_values_should_be_preserved
+      any_instance_of(Reline::Face.const_get(:Config)) do |config|
+        mock(config).format_to_sgr(
+          [[:foreground, :blue], [:style, [:bold, :italicized]], [:background, :red]]
+        )
+      end
+      Reline::Face.config(:my_config) do |face|
+        face.define :default, foreground: :blue, style: [:bold, :italicized], background: :red
+      end
+    end
+
+    def test_rgb?
+      assert_equal true, @config.send(:rgb_expression?, "#FFFFFF")
+    end
+
+    def test_invalid_rgb?
+      assert_equal false, @config.send(:rgb_expression?, "FFFFFF")
+      assert_equal false, @config.send(:rgb_expression?, "#FFFFF")
+    end
+
+    def test_format_to_sgr
+      assert_equal(
+        "#{RESET_SGR}\e[37;41;1;3m",
+        @config.send(:format_to_sgr, foreground: :white, background: :red, style: [:bold, :italicized])
+      )
+    end
+
+    def test_format_to_sgr_with_reset
+      assert_equal(
+        RESET_SGR,
+        @config.send(:format_to_sgr, style: :reset)
+      )
+      assert_equal(
+        "#{RESET_SGR}\e[37;0;41m",
+        @config.send(:format_to_sgr, foreground: :white, style: :reset, background: :red)
+      )
+    end
+
+    def test_format_to_sgr_with_single_style
+      assert_equal(
+        "#{RESET_SGR}\e[37;41;1m",
+        @config.send(:format_to_sgr, foreground: :white, background: :red, style: :bold)
+      )
+    end
+
+    def test_sgr_rgb
+      assert_equal "38;2;255;255;255", @config.send(:sgr_rgb, :foreground, "#ffffff")
+      assert_equal "48;2;18;52;86", @config.send(:sgr_rgb, :background, "#123456")
+    end
+  end
+end
diff --git a/test/reline/yamatanooroti/multiline_repl b/test/reline/yamatanooroti/multiline_repl
index bdefc48faa..e2a900b251 100755
--- a/test/reline/yamatanooroti/multiline_repl
+++ b/test/reline/yamatanooroti/multiline_repl
@@ -136,7 +136,7 @@ opt.on('--dialog VAL') { |v|
     if v.include?('alt-scrollbar')
       scrollbar = true
     end
-    Reline::DialogRenderInfo.new(pos: cursor_pos, contents: contents, height: height, scrollbar: scrollbar)
+    Reline::DialogRenderInfo.new(pos: cursor_pos, contents: contents, height: height, scrollbar: scrollbar, face: :completion_dialog)
   })
   if v.include?('alt-scrollbar')
     ENV['RELINE_ALT_SCROLLBAR'] = '1'
diff --git a/test/reline/yamatanooroti/test_rendering.rb b/test/reline/yamatanooroti/test_rendering.rb
index 8ac0c0c096..670432d86b 100644
--- a/test/reline/yamatanooroti/test_rendering.rb
+++ b/test/reline/yamatanooroti/test_rendering.rb
@@ -4,6 +4,33 @@ begin
   require 'yamatanooroti'
 
   class Reline::RenderingTest < Yamatanooroti::TestCase
+
+    FACE_CONFIGS = { no_config: "", valid_config: <<~VALID_CONFIG, incomplete_config: <<~INCOMPLETE_CONFIG }
+      require "reline"
+      Reline::Face.config(:completion_dialog) do |face|
+        face.define :default, foreground: :white, background: :blue
+        face.define :enhanced, foreground: :white, background: :magenta
+        face.define :scrollbar, foreground: :white, background: :blue
+      end
+    VALID_CONFIG
+      require "reline"
+      Reline::Face.config(:completion_dialog) do |face|
+        face.define :default, foreground: :white, background: :black
+        face.define :scrollbar, foreground: :white, background: :cyan
+      end
+    INCOMPLETE_CONFIG
+
+    def iterate_over_face_configs(&block)
+      FACE_CONFIGS.each do |config_name, face_config|
+        config_file = Tempfile.create(%w{face_config- .rb})
+        config_file.write face_config
+        block.call(config_name, config_file)
+        config_file.close
+      ensure
+        File.delete(config_file)
+      end
+    end
+
     def setup
       @pwd = Dir.pwd
       suffix = '%010d' % Random.rand(0..65535)
@@ -954,75 +981,83 @@ begin
     end
 
     def test_simple_dialog
-      start_terminal(20, 50, %W{ruby -I#{@pwd}/lib #{@pwd}/test/reline/yamatanooroti/multiline_repl --dialog simple}, startup_message: 'Multiline REPL.')
-      write('a')
-      write('b')
-      write('c')
-      write("\C-h")
-      close
-      assert_screen(<<~'EOC')
-        Multiline REPL.
-        prompt> ab
-                  Ruby is...
-                  A dynamic, open source programming
-                  language with a focus on simplicity
-                  and productivity. It has an elegant
-                  syntax that is natural to read and
-                  easy to write.
-      EOC
+      iterate_over_face_configs do |config_name, config_file|
+        start_terminal(20, 50, %W{ruby -I#{@pwd}/lib -r#{config_file.path} #{@pwd}/test/reline/yamatanooroti/multiline_repl --dialog simple}, startup_message: 'Multiline REPL.')
+        write('a')
+        write('b')
+        write('c')
+        write("\C-h")
+        close
+        assert_screen(<<~'EOC', "Failed with `#{config_name}` in Face")
+          Multiline REPL.
+          prompt> ab
+                    Ruby is...
+                    A dynamic, open source programming
+                    language with a focus on simplicity
+                    and productivity. It has an elegant
+                    syntax that is natural to read and
+                    easy to write.
+        EOC
+      end
     end
 
     def test_simple_dialog_at_right_edge
-      start_terminal(20, 40, %W{ruby -I#{@pwd}/lib #{@pwd}/test/reline/yamatanooroti/multiline_repl --dialog simple}, startup_message: 'Multiline REPL.')
-      write('a')
-      write('b')
-      write('c')
-      write("\C-h")
-      close
-      assert_screen(<<~'EOC')
-        Multiline REPL.
-        prompt> ab
-             Ruby is...
-             A dynamic, open source programming
-             language with a focus on simplicity
-             and productivity. It has an elegant
-             syntax that is natural to read and
-             easy to write.
-      EOC
+      iterate_over_face_configs do |config_name, config_file|
+        start_terminal(20, 40, %W{ruby -I#{@pwd}/lib -r#{config_file.path} #{@pwd}/test/reline/yamatanooroti/multiline_repl --dialog simple}, startup_message: 'Multiline REPL.')
+        write('a')
+        write('b')
+        write('c')
+        write("\C-h")
+        close
+        assert_screen(<<~'EOC')
+          Multiline REPL.
+          prompt> ab
+               Ruby is...
+               A dynamic, open source programming
+               language with a focus on simplicity
+               and productivity. It has an elegant
+               syntax that is natural to read and
+               easy to write.
+        EOC
+      end
     end
 
     def test_dialog_scroll_pushup_condition
-      start_terminal(10, 50, %W{ruby -I#{@pwd}/lib #{@pwd}/test/reline/yamatanooroti/multiline_repl --autocomplete}, startup_message: 'Multiline REPL.')
-      write("\n" * 10)
-      write("if 1\n  sSt\nend")
-      write("\C-p\C-h\C-e")
-      close
-      assert_screen(<<~'EOC')
-        prompt>
-        prompt>
-        prompt>
-        prompt>
-        prompt>
-        prompt>
-        prompt> if 1
-        prompt>   St
-        prompt> enString
-                  Struct
-      EOC
+      iterate_over_face_configs do |config_name, config_file|
+        start_terminal(10, 50, %W{ruby -I#{@pwd}/lib -r#{config_file.path} #{@pwd}/test/reline/yamatanooroti/multiline_repl --autocomplete}, startup_message: 'Multiline REPL.')
+        write("\n" * 10)
+        write("if 1\n  sSt\nend")
+        write("\C-p\C-h\C-e")
+        close
+        assert_screen(<<~'EOC')
+          prompt>
+          prompt>
+          prompt>
+          prompt>
+          prompt>
+          prompt>
+          prompt> if 1
+          prompt>   St
+          prompt> enString
+                    Struct
+        EOC
+      end
     end
 
     def test_simple_dialog_with_scroll_screen
-      start_terminal(5, 50, %W{ruby -I#{@pwd}/lib #{@pwd}/test/reline/yamatanooroti/multiline_repl --dialog simple}, startup_message: 'Multiline REPL.')
-      write("if 1\n  2\n  3\n  4\n  5\n  6")
-      write("\C-p\C-n\C-p\C-p\C-p#")
-      close
-      assert_screen(<<~'EOC')
-        prompt>   2
-        prompt>   3#
-        prompt>   4
-        prompt>   5
-        prompt>   6 Ruby is...
-      EOC
+      iterate_over_face_configs do |config_name, config_file|
+        start_terminal(5, 50, %W{ruby -I#{@pwd}/lib -r#{config_file.path} #{@pwd}/test/reline/yamatanooroti/multiline_repl --dialog simple}, startup_message: 'Multiline REPL.')
+        write("if 1\n  2\n  3\n  4\n  5\n  6")
+        write("\C-p\C-n\C-p\C-p\C-p#")
+        close
+        assert_screen(<<~'EOC')
+          prompt>   2
+          prompt>   3#
+          prompt>   4
+          prompt>   5
+          prompt>   6 Ruby is...
+        EOC
+      end
     end
 
     def test_autocomplete_at_bottom