Suppress command return values

lib/irb/command/chws.rb

@@ -15,7 +15,7 @@ class CurrentWorkingWorkspace < Base
       description "Show the current workspace."
 
       def execute(_arg)
-        irb_context.main
+        puts "Current workspace: #{irb_context.main}"
       end
     end
 
@@ -30,7 +30,8 @@ def execute(arg)
           obj = eval(arg, irb_context.workspace.binding)
           irb_context.change_workspace(obj)
         end
-        irb_context.main
+
+        puts "Current workspace: #{irb_context.main}"
       end
     end
   end

lib/irb/command/subirb.rb

@@ -49,6 +49,7 @@ def execute_internal(*obj)
 
         extend_irb_context
         IRB.irb(nil, *obj)
+        puts IRB.JobManager.inspect
       end
     end
 
@@ -65,7 +66,7 @@ def execute(_arg)
         end
 
         extend_irb_context
-        IRB.JobManager
+        puts IRB.JobManager.inspect
       end
     end
 
@@ -90,6 +91,7 @@ def execute_internal(key = nil)
 
         raise CommandArgumentError.new("Please specify the id of target IRB job (listed in the `jobs` command).") unless key
         IRB.JobManager.switch(key)
+        puts IRB.JobManager.inspect
       end
     end
 
@@ -112,6 +114,7 @@ def execute_internal(*keys)
 
         extend_irb_context
         IRB.JobManager.kill(*keys)
+        puts IRB.JobManager.inspect
       end
     end
   end

lib/irb/context.rb

@@ -587,18 +587,19 @@ def inspect_mode=(opt)
 
     def evaluate(statement, line_no) # :nodoc:
       @line_no = line_no
-      result = nil
 
       case statement
       when Statement::EmptyInput
         return
       when Statement::Expression
         result = evaluate_expression(statement.code, line_no)
+        set_last_value(result)
       when Statement::Command
-        result = statement.command_class.execute(self, statement.arg)
+        statement.command_class.execute(self, statement.arg)
+        set_last_value(nil)
       end
 
-      set_last_value(result)
+      nil
     end
 
     def evaluate_expression(code, line_no) # :nodoc:

test/irb/test_command.rb

@@ -485,12 +485,11 @@ class Foo; end
   class CwwsTest < WorkspaceCommandTestCase
     def test_cwws_returns_the_current_workspace_object
       out, err = execute_lines(
-        "cwws",
-        "self.class"
+        "cwws"
       )
 
       assert_empty err
-      assert_include(out, self.class.name)
+      assert_include(out, "Current workspace: #{self}")
     end
   end
 
@@ -556,7 +555,7 @@ def test_popws_replaces_the_current_workspace_with_the_previous_one
         "pushws Foo.new\n",
         "popws\n",
         "cwws\n",
-        "_.class",
+        "self.class",
       )
       assert_empty err
       assert_include(out, "=> #{self.class}")
@@ -576,20 +575,19 @@ def test_chws_replaces_the_current_workspace
       out, err = execute_lines(
         "chws #{self.class}::Foo.new\n",
         "cwws\n",
-        "_.class",
+        "self.class\n"
       )
       assert_empty err
+      assert_include(out, "Current workspace: #<#{self.class.name}::Foo")
       assert_include(out, "=> #{self.class}::Foo")
     end
 
     def test_chws_does_nothing_when_receiving_no_argument
       out, err = execute_lines(
         "chws\n",
-        "cwws\n",
-        "_.class",
       )
       assert_empty err
-      assert_include(out, "=> #{self.class}")
+      assert_include(out, "Current workspace: #{self}")
     end
   end