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-rw-r--r--code/environments/production/modules/stdlib/lib/puppet/parser/functions/merge.rb37
1 files changed, 37 insertions, 0 deletions
diff --git a/code/environments/production/modules/stdlib/lib/puppet/parser/functions/merge.rb b/code/environments/production/modules/stdlib/lib/puppet/parser/functions/merge.rb
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+++ b/code/environments/production/modules/stdlib/lib/puppet/parser/functions/merge.rb
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+#
+# merge.rb
+#
+module Puppet::Parser::Functions
+ newfunction(:merge, :type => :rvalue, :doc => <<-'DOC') 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."
+
+ DOC
+
+ 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 = {}
+ # Merge into the accumulator hash
+ args.each do |arg|
+ next if arg.is_a?(String) && arg.empty? # empty string is synonym for puppet's undef
+ 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