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#
# join.rb
#
module Puppet::Parser::Functions
newfunction(:join, :type => :rvalue, :doc => <<-EOS
This function will allow to concatenate elements of an array together
with a given suffix and optionally with prefix if such is given ...
For example:
Given the following sample manifest:
define iterator {
notice $name
}
$array = ['a', 'b', 'c']
$result = split(join($array, ',', 'letter_'), ',')
notice $result
iterator { $result: }
This will produce the following:
notice: Scope(Class[main]): letter_a letter_b letter_c
notice: Scope(Iterator[letter_a]): letter_a
notice: Scope(Iterator[letter_b]): letter_b
notice: Scope(Iterator[letter_c]): letter_c
Which allows you to avoid resorting to the following:
$result = split(inline_template("<%= array.collect { |i| \"letter_#{i}\" }.join(',') %>"), ',')
Phasing out the need for use and abuse of the infamous inline_template
in the example above and which in this very case is extremely ugly as
we have to escape double-quotes to make Puppet parser not evaluate them.
EOS
) do |arguments|
# Technically we support three arguments but only first two are mandatory ...
raise(Puppet::ParseError, "join(): Wrong number of arguments " +
"given (#{arguments.size} for 2)") if arguments.size < 2
array = arguments[0]
if not array.is_a?(Array)
raise(Puppet::ParseError, 'join(): Requires an array to work with')
end
suffix = arguments[1]
prefix = arguments[2] if arguments[2]
raise(Puppet::ParseError, 'join(): You must provide suffix ' +
'to join array elements with') if suffix.empty?
if prefix and prefix.empty?
raise(Puppet::ParseError, 'join(): You must provide prefix ' +
'to add to join')
end
if prefix and not prefix.empty?
result = prefix + array.join(suffix + prefix)
else
result = array.join(suffix)
end
return result
end
end
# vim: set ts=2 sw=2 et :
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