1 files changed, 15 insertions, 0 deletions
diff --git a/lib/expand_variables.rb b/lib/expand_variables.rb
new file mode 100644
index 00000000000..40bf9483eb5
--- /dev/null
+++ b/lib/expand_variables.rb
@@ -0,0 +1,15 @@
+String.instance_eval
+  def expand_variables(variables)
+    # Convert hash array to variables
+    if variables.is_a?(Array)
+      variables = variables.reduce({}) do |hash, variable|
+        hash[variable[:key]] = variable[:value]
+        hash
+      end
+    end
+
+    self.gsub(/\$([a-zA-Z_][a-zA-Z0-9_]*)|\${\g<1>}|%\g<1>%/) do
+      variables[$1 || $2]
+    end
+  end
+end