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# frozen_string_literal: true
#
# pick.rb
#
module Puppet::Parser::Functions
newfunction(:pick, type: :rvalue, doc: <<-EOS
@summary
This function will return
the first value in a list of values that is not undefined or an empty string.
This function is similar to a coalesce function in SQL.
@return
the first value in a list of values that is not undefined or an empty string.
Typically, this function is used to check for a value in the Puppet
Dashboard/Enterprise Console, and failover to a default value like the following:
```$real_jenkins_version = pick($::jenkins_version, '1.449')```
> *Note:*
The value of $real_jenkins_version will first look for a top-scope variable
called 'jenkins_version' (note that parameters set in the Puppet Dashboard/
Enterprise Console are brought into Puppet as top-scope variables), and,
failing that, will use a default value of 1.449.
EOS
) do |args|
args = args.compact
args.delete(:undef)
args.delete(:undefined)
args.delete('')
raise Puppet::ParseError, 'pick(): must receive at least one non empty value' if args[0].to_s.empty?
return args[0]
end
end
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