(#7013) Wire up rendering hooks on the CLI.

We now find, and call, the appropriate rendering hooks on actions during the
rendering phase.  This allows the user to intercept and replace the result
object that passes through the rest of the rendering system on the fly.

Example usage:

  action :foo do
    when_rendering :pson do |result|
      { :whatever => result[a],
        :foobar   => result[b],
      }
    end
  end

Reviewed-By: Max Martin <max@puppetlabs.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/puppet/interface/action.rb b/lib/puppet/interface/action.rb
index d9ba4eb60..b43895067 100644
--- a/lib/puppet/interface/action.rb
+++ b/lib/puppet/interface/action.rb
@@ -39,7 +39,8 @@ class Puppet::Interface::Action
     unless type.is_a? Symbol
       raise ArgumentError, "The rendering format must be a symbol, not #{type.class.name}"
     end
-    @when_rendering[type].bind(@face)
+    return unless @when_rendering.has_key? type
+    return @when_rendering[type].bind(@face)
   end
   def set_rendering_method_for(type, proc)
     unless proc.is_a? Proc