import numpy

def analyzer(filename, **args):
    if filename == None:
        return

    data_list = nlread(filename, TransmissionSpectrum)
  
    plot = Plot2D()
    plot.setXLabel("Energy / eV")
    plot.setYLabel("Transmission")
    plot.setTitle("Transmission spectrum")
    
    # Loop through the data sets
    for data in data_list:
        t = data.evaluate()
        e = data.energies().inUnitsOf(eV)
        plot.addData([e,t])
            
    return plot
    
#----------------------------------------------------------------------

# Initialize builder
builder = Builder()
builder.title('Compare data')

# Set the configuration generator
builder.setAnalyzerGenerator(analyzer)

# Set up a Builder widget interface
builder.newGroup('Parameters')
builder.filename('filename', label='NetCDF file')

builder.plot('plot0', label='Data plot')