Simplify irb_info command (#597)

Author: st0012

lib/irb/cmd/irb_info.rb

@@ -11,24 +11,20 @@ class IrbInfo < Nop
       description "Show information about IRB."
 
       def execute
-        Class.new {
-          def inspect
-            str  = "Ruby version: #{RUBY_VERSION}\n"
-            str += "IRB version: #{IRB.version}\n"
-            str += "InputMethod: #{IRB.CurrentContext.io.inspect}\n"
-            str += ".irbrc path: #{IRB.rc_file}\n" if File.exist?(IRB.rc_file)
-            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
-            str
-          end
-          alias_method :to_s, :inspect
-        }.new
+        str  = "Ruby version: #{RUBY_VERSION}\n"
+        str += "IRB version: #{IRB.version}\n"
+        str += "InputMethod: #{IRB.CurrentContext.io.inspect}\n"
+        str += ".irbrc path: #{IRB.rc_file}\n" if File.exist?(IRB.rc_file)
+        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