Update Thor::Actions#inside to return the value yielded by the block

So that calling code can inspect & use the value.

lib/thor/actions.rb

@@ -161,6 +161,8 @@ def find_in_source_paths(file)
     # to the block you provide. The path is set back to the previous path when
     # the method exits.
     #
+    # Returns the value yielded by the block.
+    #
     # ==== Parameters
     # dir<String>:: the directory to move to.
     # config<Hash>:: give :verbose => true to log and use padding.
@@ -179,7 +181,7 @@ def inside(dir = "", config = {}, &block)
         FileUtils.mkdir_p(destination_root)
       end
 
-      if pretend
+      result = if pretend
         # In pretend mode, just yield down to the block
         block.arity == 1 ? yield(destination_root) : yield
       else
@@ -189,6 +191,7 @@ def inside(dir = "", config = {}, &block)
 
       @destination_stack.pop
       shell.padding -= 1 if verbose
+      result
     end
 
     # Goes to the root and execute the given block.

spec/actions_spec.rb

@@ -165,6 +165,10 @@ def file
       end
     end
 
+    it "returns the value yielded by the block" do
+      expect(runner.inside("foo") { 123 }).to eq(123)
+    end
+
     describe "when pretending" do
       it "no directories should be created" do
         runner.inside("bar", :pretend => true) {}