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module Puppet::Parser::Functions
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newfunction(:pick, :type => :rvalue, :doc => <<-EOS
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This function is similar to a coalesce function in SQL in that it will return
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the first value in a list of values that is not undefined or an empty string
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(two things in Puppet that will return a boolean false value). Typically,
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this function is used to check for a value in the Puppet Dashboard/Enterprise
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Console, and failover to a default value like the following:
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$real_jenkins_version = pick($::jenkins_version, '1.449')
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The value of $real_jenkins_version will first look for a top-scope variable
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called 'jenkins_version' (note that parameters set in the Puppet Dashboard/
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Enterprise Console are brought into Puppet as top-scope variables), and,
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failing that, will use a default value of 1.449.
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EOS
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) do |args|
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args = args.compact
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args.delete(:undef)
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args.delete(:undefined)
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args.delete("")
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if args[0].to_s.empty? then
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fail "Must provide non empty value."
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else
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return args[0]
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end
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end
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end
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