Issue #14894 has been updated by Pieter van de Bruggen.

I'm curious about your use case.  Is there a reason you couldn't do this in the 
Puppet DSL with a defined type?  I see iteration in your example; could you 
achieve the same results with array expansion?
----------------------------------------
Feature #14894: eval function for puppet DSL as ruby function
https://projects.puppetlabs.com/issues/14894#change-64803

Author: Michael Keller
Status: Needs Decision
Priority: Normal
Assignee: Pieter van de Bruggen
Category: API
Target version: 
Affected Puppet version: 
Keywords: eval dsl 
Branch: 


it would be super to have a ruby function which "evaluates" puppet DSL code. 
that way the knowledge of the inner workings of puppet isn't required to write 
some "macros".

Example (untested code - might be working or not):

`
Puppet::Parser::Functions::newfunction(:setup_virtualclass, :doc => 'write 
stuff here') do |args|
    Puppet::Parser::Functions.autoloader.loadall
    args.flatten.each do |classname|
       next if function_defined("Setup::Virtualclass[#{classname}]")
       function_realize("Setup::Virtualclass[#{classname}]")
    end
end
`
    

could be written as:

`
Puppet::Parser::Functions::newfunction(:setup_virtualclass, :doc => 'write 
stuff here') do |args|

  classname = args[0]

  Puppet::Parser::evaluate("if !defined(Setup::Virtualclass[#{classname}]) { 
@setup::virtualclass { #{classname}: } }")

end
`






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