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Application configuration key management.

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package cfg;

import java.util.List;

public class EnvFunction implements Function {
    @Override public int args() { return 1; }

    @Override
        public String eval(Cfg cfg, String base, String id, List args) {
        String arg = cfg.cook(base,args.get(0)).trim();
        return System.getenv(arg);
    }
}