1 module Puppet::Parser::Functions
2 newfunction(:pick, :type => :rvalue, :doc => <<-EOS
4 This function is similar to a coalesce function in SQL in that it will return
5 the first value in a list of values that is not undefined or an empty string
6 (two things in Puppet that will return a boolean false value). Typically,
7 this function is used to check for a value in the Puppet Dashboard/Enterprise
8 Console, and failover to a default value like the following:
10 $real_jenkins_version = pick($::jenkins_version, '1.449')
12 The value of $real_jenkins_version will first look for a top-scope variable
13 called 'jenkins_version' (note that parameters set in the Puppet Dashboard/
14 Enterprise Console are brought into Puppet as top-scope variables), and,
15 failing that, will use a default value of 1.449.
21 args.delete(:undefined)
23 if args[0].to_s.empty? then
24 fail Puppet::ParseError, "pick(): must receive at least one non empty value"