This enhancement allows a user to add the -s flag if they want to acc…

…ess a methods origin definition. It allows for chaining of multiple esses to further go up the classes as needed.

lib/irb/cmd/show_source.rb

@@ -58,4 +58,4 @@ def bold(str)
       end
     end
   end
-end
+end

lib/irb/source_finder.rb

@@ -26,6 +26,14 @@ def find_source(signature)
       when /\A(?<owner>[A-Z]\w*(::[A-Z]\w*)*)#(?<method>[^ :.]+)\z/ # Class#method
         owner = eval(Regexp.last_match[:owner], context_binding)
         method = Regexp.last_match[:method]
+        if signature.include? " -s"
+          signature, esses = signature.split(" -")
+          super_owner = owner
+          esses.split("").each {|s| super_owner = super_owner.superclass}
+          if super_owner.respond_to?(:instance_method)
+            owner = super_owner
+          end
+        end
         if owner.respond_to?(:instance_method)
           methods = owner.instance_methods + owner.private_instance_methods
           file, line = owner.instance_method(method).source_location if methods.include?(method.to_sym)

test/irb/test_cmd.rb

@@ -469,6 +469,17 @@ def test_show_source_method
       assert_match(%r[/irb\/init\.rb], out)
     end
 
+    def test_show_source_method_s
+      File.write("#{@tmpdir}/bazbar.rb", "class Baz\n  def foo\n  end\nend\n\nclass Bar < Baz\n  def foo\n    super\n  end\nend\n")
+      out, err = execute_lines(
+        "irb_load '#{@tmpdir}/bazbar.rb'\n",
+        "show_source Bar#foo -s",
+      )
+      assert_empty err
+      p out
+      assert_match(%r[                    => :foo\n                              => :foo\n], out)
+    end
+
     def test_show_source_string
       out, err = execute_lines(
         "show_source 'IRB.conf'\n",