1 files changed, 33 insertions, 0 deletions
diff --git a/lib/irb/command/irb_info.rb b/lib/irb/command/irb_info.rb
new file mode 100644
index 0000000000..6d868de94c
--- /dev/null
+++ b/lib/irb/command/irb_info.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+module IRB
+  # :stopdoc:
+
+  module Command
+    class IrbInfo < Base
+      category "IRB"
+      description "Show information about IRB."
+
+      def execute(_arg)
+        str  = "Ruby version: #{RUBY_VERSION}\n"
+        str += "IRB version: #{IRB.version}\n"
+        str += "InputMethod: #{IRB.CurrentContext.io.inspect}\n"
+        str += "Completion: #{IRB.CurrentContext.io.respond_to?(:completion_info) ? IRB.CurrentContext.io.completion_info : 'off'}\n"
+        rc_files = IRB.irbrc_files
+        str += ".irbrc paths: #{rc_files.join(", ")}\n" if rc_files.any?
+        str += "RUBY_PLATFORM: #{RUBY_PLATFORM}\n"
+        str += "LANG env: #{ENV["LANG"]}\n" if ENV["LANG"] && !ENV["LANG"].empty?
+        str += "LC_ALL env: #{ENV["LC_ALL"]}\n" if ENV["LC_ALL"] && !ENV["LC_ALL"].empty?
+        str += "East Asian Ambiguous Width: #{Reline.ambiguous_width.inspect}\n"
+        if RbConfig::CONFIG['host_os'] =~ /mswin|msys|mingw|cygwin|bccwin|wince|emc/
+          codepage = `chcp`.b.sub(/.*: (\d+)\n/, '\1')
+          str += "Code page: #{codepage}\n"
+        end
+        puts str
+        nil
+      end
+    end
+  end
+
+  # :startdoc:
+end