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