4 module Puppet::Parser::Functions
5 newfunction(:pick, :type => :rvalue, :doc => <<-EOS
7 This function is similar to a coalesce function in SQL in that it will return
8 the first value in a list of values that is not undefined or an empty string.
11 the first value in a list of values that is not undefined or an empty string.
13 Typically, this function is used to check for a value in the Puppet
14 Dashboard/Enterprise Console, and failover to a default value like the following:
16 ```$real_jenkins_version = pick($::jenkins_version, '1.449')```
19 The value of $real_jenkins_version will first look for a top-scope variable
20 called 'jenkins_version' (note that parameters set in the Puppet Dashboard/
21 Enterprise Console are brought into Puppet as top-scope variables), and,
22 failing that, will use a default value of 1.449.
27 args.delete(:undefined)
29 raise Puppet::ParseError, 'pick(): must receive at least one non empty value' if args[0].to_s.empty?