Land #3022, support Gemfile.local

.gitignore

@@ -1,4 +1,6 @@
 .bundle
+Gemfile.local
+Gemfile.local.lock
 # Rubymine project directory
 .idea
 # Sublime Text project directory (not created by ST by default)

lib/msfenv.rb

@@ -2,7 +2,27 @@
 # Use bundler to load dependencies
 #
 
-ENV['BUNDLE_GEMFILE'] ||= ::File.expand_path(::File.join(::File.dirname(__FILE__), "..", "Gemfile"))
+GEMFILE_EXTENSIONS = [
+  '.local',
+  ''
+]
+
+unless ENV['BUNDLE_GEMFILE']
+  require 'pathname'
+
+  msfenv_real_pathname = Pathname.new(__FILE__).realpath
+  root = msfenv_real_pathname.parent.parent
+
+  GEMFILE_EXTENSIONS.each do |extension|
+    extension_pathname = root.join("Gemfile#{extension}")
+
+    if extension_pathname.readable?
+      ENV['BUNDLE_GEMFILE'] = extension_pathname.to_path
+      break
+    end
+  end
+end
+
 begin
   require 'bundler/setup'
 rescue ::LoadError