From 961dcab15d3cf00eabeb5a496efc9da051169241 Mon Sep 17 00:00:00 2001 From: Eric Shamow Date: Tue, 3 Apr 2012 22:30:46 -0400 Subject: (#13610) Add is_function_available to stdlib This function provides a simple wrapper around Puppet::Parser::Functions.function for access within Puppet manifests. This will allow users to check whether or not a plugin or functionality such as hiera is installed on the server. --- .../parser/functions/is_function_available.rb | 23 ++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 lib/puppet/parser/functions/is_function_available.rb (limited to 'lib/puppet/parser/functions/is_function_available.rb') diff --git a/lib/puppet/parser/functions/is_function_available.rb b/lib/puppet/parser/functions/is_function_available.rb new file mode 100644 index 0000000..6cbd35c --- /dev/null +++ b/lib/puppet/parser/functions/is_function_available.rb @@ -0,0 +1,23 @@ +# +# 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 + + 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 : -- cgit v1.2.3