finds new properties added in source.properties from dest.properties file

error_code_diff.gradle

def sourceProps = new Properties()
def destProps = new Properties()
def diffProps = new Properties()

file("source.properties").withInputStream { sourceProps.load(it) }
file("dest.properties").withInputStream { destProps.load(it) }

task diff {
    doFirst {
        def sourceKeys = sourceProps.stringPropertyNames();
        def destKeys = destProps.stringPropertyNames();
        sourceKeys.removeAll(destKeys)
        sourceKeys.each({ diffProps.put(it, sourceProps.getProperty(it)) })
        file("diff.properties").withWriter { diffProps.store(it, null) }
    }
}