Add reject() function

Like the grep function, but we can now reject members of an array
based on a pattern.

lib/puppet/parser/functions/reject.rb

@@ -0,0 +1,31 @@
+#
+# reject.rb
+#
+
+module Puppet::Parser::Functions
+  newfunction(:reject, :type => :rvalue, :doc => <<-EOS) do |args|
+This function searches through an array and rejects all elements that match
+the provided regular expression.
+
+*Examples:*
+
+    reject(['aaa','bbb','ccc','aaaddd'], 'aaa')
+
+Would return:
+
+    ['bbb','ccc']
+EOS
+
+    if (args.size != 2)
+      raise Puppet::ParseError,
+        "reject(): Wrong number of arguments given #{args.size} for 2"
+    end
+
+    ary = args[0]
+    pattern = Regexp.new(args[1])
+
+    ary.reject { |e| e =~ pattern }
+  end
+end
+
+# vim: set ts=2 sw=2 et :

spec/unit/puppet/parser/functions/reject_spec.rb

@@ -0,0 +1,20 @@
+#!/usr/bin/env ruby
+
+require 'spec_helper'
+
+describe "the reject function" do
+  let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
+
+  it "should exist" do
+    Puppet::Parser::Functions.function("reject").should == "function_reject"
+  end
+
+  it "should raise a ParseError if there is less than 1 arguments" do
+    lambda { scope.function_reject([]) }.should( raise_error(Puppet::ParseError))
+  end
+
+  it "should reject contents from an array" do
+    result = scope.function_reject([["1111", "aaabbb","bbbccc","dddeee"], "bbb"])
+    result.should(eq(["1111", "dddeee"]))
+  end
+end