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module Puppet::Parser::Functions
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newfunction(:mysql_deepmerge, :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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$merged_hash = mysql_deepmerge($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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When there are conficting uses of dashes and underscores in two keys (which mysql would otherwise equate),
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the rightmost style will win.
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ENDHEREDOC
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if args.length < 2
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raise Puppet::ParseError, ("mysql_deepmerge(): wrong number of arguments (#{args.length}; must be at least 2)")
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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, "mysql_deepmerge: unexpected argument type #{arg.class}, only expects hash arguments"
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end
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# Now we have to traverse our hash assigning our non-hash values
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# to the matching keys in our result while following our hash values
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# and repeating the process.
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overlay( 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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def has_normalized!(hash, key)
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return true if hash.has_key?( key )
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return false unless key.match(/-|_/)
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other_key = key.include?('-') ? key.gsub( '-', '_' ) : key.gsub( '_', '-' )
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return false unless hash.has_key?( other_key )
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hash[key] = hash.delete( other_key )
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return true;
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end
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def overlay( hash1, hash2 )
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hash2.each do |key, value|
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if(has_normalized!( hash1, key ) and value.is_a?(Hash) and hash1[key].is_a?(Hash))
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overlay( hash1[key], value )
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else
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hash1[key] = value
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end
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end
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end
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