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TBEL is a powerful expression language for ThingsBoard platform user-defined functions. Original implementation is based on MVEL.

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/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.mvel2.sh;

import org.mvel2.MVEL;

import java.io.File;
import java.io.IOException;

public class Main {
  public static void main(String[] args) throws IOException {
    if (args.length != 0) {
      MVEL.evalFile(new File(args[0]));
    }
    else {
      showSplash();
      new ShellSession().run();
    }
  }

  private static void showSplash() {
    System.out.println("\nMVEL-Shell (MVELSH)");
    System.out.println("Copyright (C) 2010, Christopher Brock, The Codehaus");
    System.out.println("Version " + MVEL.VERSION + "." + MVEL.VERSION_SUB + "\n");
  }
}