Re-work yardoc options

The `puppet yardoc` command now consumes an optional list of manifest files to
document. If no files are passed, a default glob of `manifests/**/*.pp` will be
used.

lib/puppet/face/yardoc.rb

@@ -5,8 +5,7 @@ Puppet::Face.define(:yardoc, '0.0.1') do
   action(:yardoc) do
     default
 
-    when_invoked do |manifest, options|
-
+    when_invoked do |*args|
       unless Puppet.features.yard?
         raise RuntimeError, "The 'yard' gem must be installed in order to use this face."
       end
@@ -15,10 +14,22 @@ Puppet::Face.define(:yardoc, '0.0.1') do
         raise RuntimeError, "The 'rgen' gem must be installed in order to use this face."
       end
 
+      # The last element of the argument array should be the options hash.
+      #
+      # NOTE: The Puppet Face will throw 'unrecognized option' errors if any
+      # YARD options are passed to it. The best way to approach this problem is
+      # by using the `.yardopts` file. YARD will autoload any options placed in
+      # that file.
+      opts = args.pop
+
+      # For now, assume the remaining positional args are a list of manifest
+      # files to parse.
+      manifest_files = (args.empty? ? ['manifests/**/*.pp'] : args)
+
       require 'puppetx/yardoc/yard/plugin'
 
       # Hand off to YARD for further processing.
-      YARD::CLI::Yardoc.run(manifest)
+      YARD::CLI::Yardoc.run(*manifest_files)
     end
   end
 end