Added ability to flatten the resulting array in the function zip.

This would allow for creating hashes on the fly from two arrays.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>

diff --git a/zip.rb b/zip.rb
new file mode 100644 (file)
index 0000000..024d64a
--- /dev/null
+++ b/zip.rb
@@ -0,0 +1,56 @@
+#
+# zip.rb
+#
+
+module Puppet::Parser::Functions
+  newfunction(:zip, :type => :rvalue, :doc => <<-EOS
+    EOS
+  ) do |arguments|
+
+    # Technically we support three arguments but only first is mandatory ...
+    raise(Puppet::ParseError, "zip(): Wrong number of arguments " +
+      "given (#{arguments.size} for 2)") if arguments.size < 2
+
+    a = arguments[0]
+    b = arguments[1]
+
+    unless a.is_a?(Array) and b.is_a?(Array)
+      raise(Puppet::ParseError, 'zip(): Requires array to work with')
+    end
+
+    flatten = arguments[2] if arguments[2]
+
+    if flatten
+      klass = flatten.class
+
+      # We can have either true or false, or string which resembles boolean ...
+      unless [FalseClass, TrueClass, String].include?(klass)
+        raise(Puppet::ParseError, 'zip(): Requires either ' +
+          'boolean or string to work with')
+      end
+
+      if flatten.is_a?(String)
+        # We consider all the yes, no, y, n and so on too ...
+        flatten = case flatten
+          #
+          # This is how undef looks like in Puppet ...
+          # We yield false 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, 'zip(): Unknown type of boolean given')
+        end
+      end
+    end
+
+    result = a.zip(b)
+    result = flatten ? result.flatten : result
+
+    return result
+  end
+end
+
+# vim: set ts=2 sw=2 et :