1 files changed, 27 insertions, 0 deletions
diff --git a/code/environments/production/modules/stdlib/lib/puppet/parser/functions/pick.rb b/code/environments/production/modules/stdlib/lib/puppet/parser/functions/pick.rb
new file mode 100644
index 0000000..300e164
--- /dev/null
+++ b/code/environments/production/modules/stdlib/lib/puppet/parser/functions/pick.rb
@@ -0,0 +1,27 @@
+#
+# pick.rb
+#
+module Puppet::Parser::Functions
+  newfunction(:pick, :type => :rvalue, :doc => <<-DOC
+    This function is similar to a coalesce function in SQL in that it will return
+    the first value in a list of values that is not undefined or an empty string
+    (two things in Puppet that will return a boolean false value). Typically,
+    this function is used to check for a value in the Puppet Dashboard/Enterprise
+    Console, and failover to a default value like the following:
+
+      $real_jenkins_version = pick($::jenkins_version, '1.449')
+
+    The value of $real_jenkins_version will first look for a top-scope variable
+    called 'jenkins_version' (note that parameters set in the Puppet Dashboard/
+    Enterprise Console are brought into Puppet as top-scope variables), and,
+    failing that, will use a default value of 1.449.
+DOC
+             ) do |args|
+    args = args.compact
+    args.delete(:undef)
+    args.delete(:undefined)
+    args.delete('')
+    raise Puppet::ParseError, 'pick(): must receive at least one non empty value' if args[0].to_s.empty?
+    return args[0]
+  end
+end