module Puppet::Parser::Functions newfunction(:merge, :type => :rvalue, :doc => <<-'ENDHEREDOC') do |args| Merges two or more hashes together and returns the resulting hash. For example: $hash1 = {'one' => 1, 'two', => 2} $hash2 = {'two' => 'dos', 'three', => 'tres'} $merged_hash = merge($hash1, $hash2) # The resulting hash is equivalent to: # $merged_hash = {'one' => 1, 'two' => 'dos', 'three' => 'tres'} When there is a duplicate key, the key in the rightmost hash will "win." ENDHEREDOC if args.length < 2 raise Puppet::ParseError, ("merge(): wrong number of arguments (#{args.length}; must be at least 2)") end # The hash we accumulate into accumulator = Hash.new # Merge into the accumulator hash args.each do |arg| unless arg.is_a?(Hash) raise Puppet::ParseError, "merge: unexpected argument type #{arg.class}, only expects hash arguments" end accumulator.merge!(arg) end # Return the fully merged hash accumulator end end