adding IDF variable reporting code to OS via measure?

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You can add each variable in the measure tab with multiple 'Add Ouput Variable' measures, but this can get kind of tedious. Instead, if you have all your favorite Output:Variable objects loaded in an .idf file called outputs.idf, you can write an OpenStudio measure with that file in the measure folder in a 'resources' subdirectory. Now in your measure, you can load that idf into an OpenStudio workspace with

library = OpenStudio:Workspace:load("#{File.dirname(__FILE__)}/resources/outputs.idf").get

then translate this idf to osm using the Reverse Translator (which will translate Output:Variable objects):

rt = OpenStudio::EnergyPlus::ReverseTranslator.new
library_model = rt.translateWorkspace(library)

Now all you have to do is get all the output variables from the library model, and add them to your model:

#get variables from library model
vars = library_model.getOutputVariables

#loop through each variable and add that variable to the model
vars.each do |var|
  variable_name = var.variableName
  newVariable = OpenStudio::Model::OutputVariable.new(variable_name,model)
end

You can add a measure argument to choose a reporting frequency, and add newVariable.setReportingFrequency(reporting_frequency) inside the loop above. Now you have one measure to add whatever number of output variables that you'd like, with no need to fuss in your model's idf.