Find nested module definitions [Fixes #832]

This fixes `$ ActionController::ForceSSL`

lib/pry/wrapped_module.rb

@@ -348,7 +348,17 @@ class Pry
     # given module.
     # @return [Array<Pry::Method>]
     def all_methods_for(mod)
-      all_from_common(mod, :instance_method) + all_from_common(mod, :method)
+      methods = all_from_common(mod, :instance_method) + all_from_common(mod, :method)
+
+      return methods unless methods.empty?
+
+      safe_send(mod, :constants).map do |const_name|
+        if const = nested_module?(mod, const_name)
+          all_methods_for(const)
+        else
+          []
+        end
+      end.flatten
     end
 
     # FIXME: a variant of this method is also found in Pry::Method
@@ -366,6 +376,13 @@ class Pry
       end.flatten
     end
 
+    def nested_module?(parent, name)
+      child = safe_send(parent, :const_get, name)
+      return unless Module === child
+      return unless safe_send(child, :name) == "#{safe_send(parent, :name)}::#{name}"
+      child
+    end
+
     # Detect methods that are defined with `def_delegator` from the Forwardable
     # module. We want to reject these methods as they screw up module
     # extraction since the `source_location` for such methods points at forwardable.rb

spec/wrapped_module_spec.rb

@@ -22,6 +22,11 @@ describe Pry::WrappedModule do
           end
         end
 
+        class PitifullyBlank
+          DEFAULT_TEST = CandidateTest
+        end
+
+        FOREVER_ALONE_LINE = __LINE__ + 1
         class ForeverAlone
           class DoublyNested
             # nested docs
@@ -39,8 +44,12 @@ describe Pry::WrappedModule do
         Pry::WrappedModule(Host::CandidateTest).number_of_candidates.should == 3
       end
 
-      it 'should return 0 candidates for a class with no methods and no other definitions' do
-        Pry::WrappedModule(Host::ForeverAlone).number_of_candidates.should == 0
+      it 'should return 0 candidates for a class with no nested modules or methods' do
+        Pry::WrappedModule(Host::PitifullyBlank).number_of_candidates.should == 0
+      end
+
+      it 'should return 1 candidate for a class with a nested module with methods' do
+        Pry::WrappedModule(Host::ForeverAlone).number_of_candidates.should == 1
       end
     end
 
@@ -68,8 +77,13 @@ describe Pry::WrappedModule do
         wm.source_location.should == wm.candidate(0).source_location
       end
 
+      it 'should return the location of the outer module if an inner module has methods' do
+        wm = Pry::WrappedModule(Host::ForeverAlone)
+        wm.source_location.should == [__FILE__, Host::FOREVER_ALONE_LINE]
+      end
+
       it 'should return nil if no source_location can be found' do
-        Pry::WrappedModule(Host::ForeverAlone).source_location.should == nil
+        Pry::WrappedModule(Host::PitifullyBlank).source_location.should == nil
       end
     end