Display RBS type signatures in ri output

Author: st0012

lib/rdoc/ri/driver.rb

@@ -1415,6 +1415,7 @@ def render_method(out, store, method, name) # :nodoc:
     out << RDoc::Markup::Rule.new(1)
 
     render_method_arguments out, method.arglists
+    render_method_type_signature out, method.type_signature
     render_method_superclass out, method
     if method.is_alias_for
       al = method.is_alias_for
@@ -1452,6 +1453,14 @@ def render_method_comment(out, method, alias_for = nil)# :nodoc:
     end
   end
 
+  def render_method_type_signature(out, type_signature) # :nodoc:
+    return unless type_signature
+
+    sigs = type_signature.split("\n").map { |s| s + "\n" }
+    out << RDoc::Markup::Verbatim.new(*sigs)
+    out << RDoc::Markup::BlankLine.new
+  end
+
   def render_method_superclass(out, method) # :nodoc:
     return unless
       method.respond_to?(:superclass_method) and method.superclass_method

test/rdoc/ri/driver_test.rb

@@ -737,6 +737,20 @@ def test_display_method
     assert_match %r%blah.6%,        out
   end
 
+  def test_display_method_with_type_signature
+    util_store
+
+    @blah.type_signature = '(Integer) -> String'
+    @store1.save
+
+    out, = capture_output do
+      @driver.display_method 'Foo::Bar#blah'
+    end
+
+    assert_match %r%Foo::Bar#blah%, out
+    assert_match %r%\(Integer\) -> String%, out
+  end
+
   def test_display_method_attribute
     util_store