1 files changed, 24 insertions, 0 deletions
diff --git a/code/environments/production/modules/stdlib/lib/puppet/parser/functions/is_function_available.rb b/code/environments/production/modules/stdlib/lib/puppet/parser/functions/is_function_available.rb
new file mode 100644
index 0000000..e02aa53
--- /dev/null
+++ b/code/environments/production/modules/stdlib/lib/puppet/parser/functions/is_function_available.rb
@@ -0,0 +1,24 @@
+#
+# is_function_available.rb
+#
+module Puppet::Parser::Functions
+  newfunction(:is_function_available, :type => :rvalue, :doc => <<-DOC
+    This function accepts a string as an argument, determines whether the
+    Puppet runtime has access to a function by that name.  It returns a
+    true if the function exists, false if not.
+    DOC
+             ) do |arguments|
+
+    if arguments.size != 1
+      raise(Puppet::ParseError, "is_function_available?(): Wrong number of arguments given #{arguments.size} for 1")
+    end
+
+    # Only allow String types
+    return false unless arguments[0].is_a?(String)
+
+    function = Puppet::Parser::Functions.function(arguments[0].to_sym)
+    function.is_a?(String) && !function.empty?
+  end
+end
+
+# vim: set ts=2 sw=2 et :