1 files changed, 34 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/merge.rb b/lib/puppet/parser/functions/merge.rb
new file mode 100644
index 00000000..1b39f206
--- /dev/null
+++ b/lib/puppet/parser/functions/merge.rb
@@ -0,0 +1,34 @@
+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|
+      next if arg.is_a? String and 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