1 files changed, 26 insertions, 0 deletions
diff --git a/puppet/modules/stdlib/lib/puppet/parser/functions/is_function_available.rb b/puppet/modules/stdlib/lib/puppet/parser/functions/is_function_available.rb
new file mode 100644
index 00000000..6da82c8c
--- /dev/null
+++ b/puppet/modules/stdlib/lib/puppet/parser/functions/is_function_available.rb
@@ -0,0 +1,26 @@
+#
+# is_function_available.rb
+#
+
+module Puppet::Parser::Functions
+  newfunction(:is_function_available, :type => :rvalue, :doc => <<-EOS
+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.
+    EOS
+  ) do |arguments|
+
+    if (arguments.size != 1) then
+      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) and not function.empty?
+  end
+end
+
+# vim: set ts=2 sw=2 et :