1 files changed, 74 insertions, 0 deletions
diff --git a/lib/irb/command/show_source.rb b/lib/irb/command/show_source.rb
new file mode 100644
index 0000000000..f4c6f104a2
--- /dev/null
+++ b/lib/irb/command/show_source.rb
@@ -0,0 +1,74 @@
+# frozen_string_literal: true
+
+require_relative "../source_finder"
+require_relative "../pager"
+require_relative "../color"
+
+module IRB
+  module Command
+    class ShowSource < Base
+      include RubyArgsExtractor
+
+      category "Context"
+      description "Show the source code of a given method, class/module, or constant."
+
+      help_message <<~HELP_MESSAGE
+        Usage: show_source [target] [-s]
+
+          -s  Show the super method. You can stack it like `-ss` to show the super of the super, etc.
+
+        Examples:
+
+          show_source Foo
+          show_source Foo#bar
+          show_source Foo#bar -s
+          show_source Foo.baz
+          show_source Foo::BAR
+      HELP_MESSAGE
+
+      def execute(arg)
+        # Accept string literal for backward compatibility
+        str = unwrap_string_literal(arg)
+        unless str.is_a?(String)
+          puts "Error: Expected a string but got #{str.inspect}"
+          return
+        end
+
+        str, esses = str.split(" -")
+        super_level = esses ? esses.count("s") : 0
+        source = SourceFinder.new(@irb_context).find_source(str, super_level)
+
+        if source
+          show_source(source)
+        elsif super_level > 0
+          puts "Error: Couldn't locate a super definition for #{str}"
+        else
+          puts "Error: Couldn't locate a definition for #{str}"
+        end
+        nil
+      end
+
+      private
+
+      def show_source(source)
+        if source.binary_file?
+          content = "\n#{bold('Defined in binary file')}: #{source.file}\n\n"
+        else
+          code = source.colorized_content || 'Source not available'
+          content = <<~CONTENT
+
+            #{bold("From")}: #{source.file}:#{source.line}
+
+            #{code.chomp}
+
+          CONTENT
+        end
+        Pager.page_content(content)
+      end
+
+      def bold(str)
+        Color.colorize(str, [:BOLD])
+      end
+    end
+  end
+end