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-rw-r--r--lib/puppet/parser/functions/prefix.rb45
1 files changed, 45 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/prefix.rb b/lib/puppet/parser/functions/prefix.rb
new file mode 100644
index 0000000..4593976
--- /dev/null
+++ b/lib/puppet/parser/functions/prefix.rb
@@ -0,0 +1,45 @@
+#
+# prefix.rb
+#
+
+module Puppet::Parser::Functions
+ newfunction(:prefix, :type => :rvalue, :doc => <<-EOS
+This function applies a prefix to all elements in an array.
+
+*Examles:*
+
+ prefix(['a','b','c'], 'p')
+
+Will return: ['pa','pb','pc']
+ EOS
+ ) do |arguments|
+
+ # Technically we support two arguments but only first is mandatory ...
+ raise(Puppet::ParseError, "prefix(): Wrong number of arguments " +
+ "given (#{arguments.size} for 1)") if arguments.size < 1
+
+ array = arguments[0]
+
+ unless array.is_a?(Array)
+ raise(Puppet::ParseError, 'prefix(): Requires array to work with')
+ end
+
+ prefix = arguments[1] if arguments[1]
+
+ if prefix
+ unless prefix.is_a?(String)
+ raise(Puppet::ParseError, 'prefix(): Requires string to work with')
+ end
+ end
+
+ # Turn everything into string same as join would do ...
+ result = array.collect do |i|
+ i = i.to_s
+ prefix ? prefix + i : i
+ end
+
+ return result
+ end
+end
+
+# vim: set ts=2 sw=2 et :