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# frozen_string_literal: true
#
# pick_default.rb
#
module Puppet::Parser::Functions
newfunction(:pick_default, type: :rvalue, doc: <<-DOC
@summary
This function will return the first value in a list of values that is not undefined or an empty string.
@return
This function is similar to a coalesce function in SQL in that it will return
the first value in a list of values that is not undefined or an empty string
If no value is found, it will return the last argument.
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:
$real_jenkins_version = pick_default($::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.
Contrary to the pick() function, the pick_default does not fail if
all arguments are empty. This allows pick_default to use an empty value as
default.
DOC
) do |args|
raise 'Must receive at least one argument.' if args.empty?
default = args.last
args = args[0..-2].compact
args.delete(:undef)
args.delete(:undefined)
args.delete('')
args << default
return args[0]
end
end
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