Add a count function

Similar to the ruby count method on arrays.

1 files changed, 22 insertions, 0 deletions

diff --git a/lib/puppet/parser/functions/count.rb b/lib/puppet/parser/functions/count.rb
new file mode 100644
index 0000000..52de1b8
--- /dev/null
+++ b/lib/puppet/parser/functions/count.rb
@@ -0,0 +1,22 @@
+module Puppet::Parser::Functions
+  newfunction(:count, :type => :rvalue, :arity => -2, :doc => <<-EOS
+Takes an array as first argument and an optional second argument.
+Count the number of elements in array that matches second argument.
+If called with only an array it counts the number of elements that are not nil/undef.
+    EOS
+  ) do |args|
+
+    if (args.size > 2) then
+      raise(ArgumentError, "count(): Wrong number of arguments "+
+        "given #{args.size} for 1 or 2.")
+    end
+
+    collection, item = args
+
+    if item then
+      collection.count item
+    else
+      collection.count { |obj| obj != nil && obj != :undef && obj != '' }
+    end
+  end
+end