[ruby/irb] Add irb_info command

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

3 files changed, 62 insertions, 0 deletions

diff --git a/lib/irb/cmd/info.rb b/lib/irb/cmd/info.rb
new file mode 100644
index 0000000000..ddf57b00b4
--- /dev/null
+++ b/lib/irb/cmd/info.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: false
+
+require_relative "nop"
+
+# :stopdoc:
+module IRB
+  module ExtendCommand
+    class Info < Nop
+      def execute
+        Class.new {
+          def inspect
+            <<~EOM.chomp
+              Ruby version: #{RUBY_VERSION}
+              IRB version: #{IRB.version}
+              InputMethod: #{IRB.CurrentContext.io.inspect}
+              .irbrc path: #{IRB.rc_file}
+            EOM
+          end
+          alias_method :to_s, :inspect
+        }.new
+      end
+    end
+  end
+end
+# :startdoc:
diff --git a/lib/irb/extend-command.rb b/lib/irb/extend-command.rb
index de145e962d..828103ccc9 100644
--- a/lib/irb/extend-command.rb
+++ b/lib/irb/extend-command.rb
@@ -121,6 +121,10 @@ module IRB # :nodoc:
         [:help, NO_OVERRIDE],
       ],
 
+      [
+        :irb_info, :Info, "irb/cmd/info"
+      ],
+
     ]
 
     # Installs the default irb commands:
diff --git a/lib/irb/input-method.rb b/lib/irb/input-method.rb
index 9fbbaeb0f3..47fc5db84f 100644
--- a/lib/irb/input-method.rb
+++ b/lib/irb/input-method.rb
@@ -43,6 +43,11 @@ module IRB
     def readable_after_eof?
       false
     end
+
+    # For debug message
+    def inspect
+      'Abstract InputMethod'
+    end
   end
 
   class StdioInputMethod < InputMethod
@@ -93,6 +98,11 @@ module IRB
     def encoding
       @stdin.external_encoding
     end
+
+    # For debug message
+    def inspect
+      'StdioInputMethod'
+    end
   end
 
   # Use a File for IO with irb, see InputMethod
@@ -125,6 +135,11 @@ module IRB
     def encoding
       @io.external_encoding
     end
+
+    # For debug message
+    def inspect
+      'FileInputMethod'
+    end
   end
 
   begin
@@ -202,6 +217,13 @@ module IRB
       end
       Readline.completion_append_character = nil
       Readline.completion_proc = IRB::InputCompletor::CompletionProc
+
+      # For debug message
+      def inspect
+        inputrc_path = File.expand_path(ENV['INPUTRC'] || '~/.inputrc')
+        readline_impl = (defined?(Reline) && Readline == Reline) ? 'Reline' : 'ext/readline'
+        "ReadlineInputMethod with #{readline_impl} #{Readline::VERSION} and #{inputrc_path}"
+      end
     end
   rescue LoadError
   end
@@ -297,5 +319,16 @@ module IRB
     def encoding
       @stdin.external_encoding
     end
+
+    # For debug message
+    def inspect
+      config = Reline::Config.new
+      if config.respond_to?(:inputrc_path)
+        inputrc_path = config.inputrc_path
+      else
+        inputrc_path = File.expand_path(ENV['INPUTRC'] || '~/.inputrc')
+      end
+      "ReidlineInputMethod with Reline #{Reline::VERSION} and #{inputrc_path}"
+    end
   end
 end