1 files changed, 49 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/bool2num.rb b/lib/puppet/parser/functions/bool2num.rb
new file mode 100644
index 0000000..9a07a8a
--- /dev/null
+++ b/lib/puppet/parser/functions/bool2num.rb
@@ -0,0 +1,49 @@
+#
+# bool2num.rb
+#
+
+module Puppet::Parser::Functions
+  newfunction(:bool2num, :type => :rvalue, :doc => <<-EOS
+    Converts a boolean to a number. Converts the values:
+      false, f, 0, n, and no to 0
+      true, t, 1, y, and yes to 1
+    Requires a single boolean or string as an input.
+    EOS
+  ) do |arguments|
+
+    raise(Puppet::ParseError, "bool2num(): Wrong number of arguments " +
+      "given (#{arguments.size} for 1)") if arguments.size < 1
+
+    value = arguments[0]
+    klass = value.class
+
+    # We can have either true or false, or string which resembles boolean ...
+    unless [FalseClass, TrueClass, String].include?(klass)
+      raise(Puppet::ParseError, 'bool2num(): Requires either ' +
+        'boolean or string to work with')
+    end
+
+    if value.is_a?(String)
+      # We consider all the yes, no, y, n and so on too ...
+      value = case value
+        #
+        # This is how undef looks like in Puppet ...
+        # We yield 0 (or false if you wish) in this case.
+        #
+        when /^$/, '' then false # Empty string will be false ...
+        when /^(1|t|y|true|yes)$/  then true
+        when /^(0|f|n|false|no)$/  then false
+        when /^(undef|undefined)$/ then false # This is not likely to happen ...
+        else
+          raise(Puppet::ParseError, 'bool2num(): Unknown type of boolean given')
+      end
+    end
+
+    # We have real boolean values as well ...
+    result = value ? 1 : 0
+
+    return result
+  end
+end
+
+# vim: set ts=2 sw=2 et :