1 files changed, 48 insertions, 0 deletions
diff --git a/lib/irb/cmd/ls.rb b/lib/irb/cmd/ls.rb
new file mode 100644
index 0000000000..c39937d4db
--- /dev/null
+++ b/lib/irb/cmd/ls.rb
@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+require_relative "nop"
+require_relative "../color"
+
+# :stopdoc:
+module IRB
+  module ExtendCommand
+    class Ls < Nop
+      def execute(*arg, grep: nil)
+        o = Output.new(grep: grep)
+
+        obj    = arg.empty? ? irb_context.workspace.main : arg.first
+        locals = arg.empty? ? irb_context.workspace.binding.local_variables : []
+        klass  = (obj.class == Class || obj.class == Module ? obj : obj.class)
+
+        o.dump("constants", obj.constants) if obj.respond_to?(:constants)
+        o.dump("#{klass}.methods", obj.singleton_methods(false))
+        o.dump("#{klass}#methods", klass.public_instance_methods(false))
+        o.dump("instance variables", obj.instance_variables)
+        o.dump("class variables", klass.class_variables)
+        o.dump("locals", locals)
+      end
+
+      class Output
+        def initialize(grep: nil)
+          @grep = grep
+        end
+
+        def dump(name, strs)
+          strs = strs.grep(@grep) if @grep
+          strs = strs.sort
+          return if strs.empty?
+
+          print "#{Color.colorize(name, [:BOLD, :BLUE])}: "
+          if strs.size > 7
+            len = [strs.map(&:length).max, 16].min
+            puts; strs.each_slice(7) { |ss| puts "  #{ss.map { |s| "%-#{len}s" % s }.join("  ")}" }
+          else
+            puts strs.join("  ")
+          end
+        end
+      end
+      private_constant :Output
+    end
+  end
+end
+# :startdoc: