Getting my bearings in the node terminus

gistfile1.txt

517 ~ % rdebug puppet -- --node_terminus=exec_with_fact -e 'notice("Hi")'
(rdb:1) catch NotImplementedError
Catch exception NotImplementedError.
(rdb:1) continue
Catchpoint at /Users/jeff/src/faces/external_nodes_with_fact/lib/puppet/indirector/node/exec_with_fact.rb:10: `We should translate certname to a fact value.' (NotImplementedError)
        from /Users/jeff/src/puppet/lib/puppet/application.rb:304:in `run'
        from /Users/jeff/src/puppet/lib/puppet/application.rb:410:in `exit_on_fail'
        from /Users/jeff/src/puppet/lib/puppet/application.rb:304:in `run'
        from /Users/jeff/src/puppet/lib/puppet/util/command_line.rb:59:in `execute'
        from /Users/jeff/src/puppet/bin/puppet:4
        from /Users/jeff/.rvm/gems/ruby-1.8.7-p302/gems/ruby-debug-0.10.4/bin/rdebug:126:in `debug_load'
        from /Users/jeff/.rvm/gems/ruby-1.8.7-p302/gems/ruby-debug-0.10.4/bin/rdebug:126:in `debug_program'
        from /Users/jeff/.rvm/gems/ruby-1.8.7-p302/gems/ruby-debug-0.10.4/bin/rdebug:413
        from /Users/jeff/.rvm/gems/ruby-1.8.7-p302/bin/rdebug:19:in `load'
        from /Users/jeff/.rvm/gems/ruby-1.8.7-p302/bin/rdebug:19
/Users/jeff/src/faces/external_nodes_with_fact/lib/puppet/indirector/node/exec_with_fact.rb:10
raise NotImplementedError, "We should translate certname to a fact value."(rdb:1) l
[5, 14] in /Users/jeff/src/faces/external_nodes_with_fact/lib/puppet/indirector/node/exec_with_fact.rb
   5  
   6    def find(request)
   7      # JJM: Find out if we have access to the facts here.  I think we do.
   8      # Add a configuration setting to determine which fact to inspect.
   9      # Execute the ENC script with the fact value.
=> 10      raise NotImplementedError, "We should translate certname to a fact value."
   11    end
   12  
   13    private
   14  
(rdb:1) putl request
#<Puppet::Indirector::Request:0x10241b600
 @indirection_name=:node,
 @instance=nil,
 @key="heif.local",
 @method=:find,
 @options={}>

(rdb:1) bt
--> #0 Kernel.find(request#Puppet::Indirector::R..., __dbg_verbose_save#FalseClass) 
       at line /Users/jeff/src/faces/external_nodes_with_fact/lib/puppet/indirector/node/exec_with_fact.rb:10
    #1 Puppet::Node::ExecWithFact.find(request#Puppet::Indirector::R...) 
       at line /Users/jeff/src/faces/external_nodes_with_fact/lib/puppet/indirector/node/exec_with_fact.rb:10
    #2 Puppet::Indirector::Indirection.find(key#String) 
       at line /Users/jeff/src/puppet/lib/puppet/indirector/indirection.rb:188
    #3 Puppet::Indirector::ClassMethods.find 
       at line /Users/jeff/src/puppet/lib/puppet/indirector.rb:50
    #4 Puppet::Application::Apply.main 
       at line /Users/jeff/src/puppet/lib/puppet/application/apply.rb:93
    #5 Puppet::Application::Apply.run_command 
       at line /Users/jeff/src/puppet/lib/puppet/application/apply.rb:35
    #6 Puppet::Application.run(message#String, code#Fixnum) 
       at line /Users/jeff/src/puppet/lib/puppet/application.rb:304
    #7 Puppet::Application.run 
       at line /Users/jeff/src/puppet/lib/puppet/application.rb:304
    #8 Puppet::Util::CommandLine.new 
       at line /Users/jeff/src/puppet/lib/puppet/util/command_line.rb:59
    #9 new at line /Users/jeff/src/puppet/bin/puppet:4