Viewing a Gem's Source Code

Ruby dabbler/newbie here who's not familiar with the ecosystem, so apologies if this is one of those super duh questions. Is there a way to view all the files and/or source code installed by a gem? That is, I just ran ``` $ gem install sass ``` And the sass gem is now a part of my local system ``` $ gem list --local ... sass (3.1.16, 3.1.2) ... ``` I want to know what the `gem install` command put on my system. Is there a command I can run to see all the files installed by the gem? After some googling, `man gem` and `gem help commands`, I discovered the `contents` command. $ gem contents sass However, when I run this command with the aforementioned sass gem, I get the following results ``` .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/engine_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/functions_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/extend_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/logger_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/css2sass_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/conversion_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/script_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/util/subset_map_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/util/multibyte_string_scanner_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/callbacks_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/importer_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/scss/css_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/scss/scss_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/scss/rx_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/util_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/script_conversion_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/less_conversion_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/cache_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/plugin_test.rb .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/bin/sass .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/bin/sass-convert .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/bin/scss ``` However, this list seems incomplete as I know there are files in ``` .../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.2/lib/ ``` Why does `contents` not show the files from `lib`? Is it possible for a `gem` installer to install files outside of the gems folder? Is there a command that can show everything installed by a gem?