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module Puppet::Parser::Functions
newfunction(:deep_merge, :type => :rvalue, :doc => <<-'ENDHEREDOC') do |args|
Recursively merges two or more hashes together and returns the resulting hash.
For example:
$hash1 = {'one' => 1, 'two' => 2, 'three' => { 'four' => 4 } }
$hash2 = {'two' => 'dos', 'three' => { 'five' => 5 } }
$merged_hash = deep_merge($hash1, $hash2)
# The resulting hash is equivalent to:
# $merged_hash = { 'one' => 1, 'two' => 'dos', 'three' => { 'four' => 4, 'five' => 5 } }
When there is a duplicate key that is a hash, they are recursively merged.
When there is a duplicate key that is not a hash, the key in the rightmost hash will "win."
ENDHEREDOC
if args.length < 2
raise Puppet::ParseError, ("deep_merge(): wrong number of arguments (#{args.length}; must be at least 2)")
end
deep_merge = Proc.new do |hash1,hash2|
hash1.merge!(hash2) do |key,old_value,new_value|
if old_value.is_a?(Hash) && new_value.is_a?(Hash)
deep_merge.call(old_value, new_value)
else
new_value
end
end
end
result = Hash.new
args.each do |arg|
next if arg.is_a? String and arg.empty? # empty string is synonym for puppet's undef
# If the argument was not a hash, skip it.
unless arg.is_a?(Hash)
raise Puppet::ParseError, "deep_merge: unexpected argument type #{arg.class}, only expects hash arguments"
end
deep_merge.call(result, arg)
end
return( result )
end
end
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