@Override
 public Object apply(List<Object> args, Context context) throws ParseException {
   Map<String, StellarExecutor.VariableResult> variables =
       (Map<String, StellarExecutor.VariableResult>)
           context.getCapability(StellarExecutor.SHELL_VARIABLES).get();
   if (args.size() == 0) {
     return null;
   }
   String variable = (String) args.get(0);
   if (variable == null) {
     return null;
   }
   StellarExecutor.VariableResult result = variables.get(variable);
   if (result != null && result.getExpression() != null) {
     return result.getExpression();
   }
   return null;
 }
 @Override
 public Object apply(List<Object> args, Context context) throws ParseException {
   Map<String, StellarExecutor.VariableResult> variables =
       (Map<String, StellarExecutor.VariableResult>)
           context.getCapability(StellarExecutor.SHELL_VARIABLES).get();
   LinkedHashMap<String, String> ret = new LinkedHashMap<>();
   for (Object arg : args) {
     if (arg == null) {
       continue;
     }
     String variable = (String) arg;
     StellarExecutor.VariableResult result = variables.get(variable);
     if (result != null && result.getExpression() != null) {
       ret.put(variable, result.getExpression());
     }
   }
   return ret;
 }
    @Override
    public Object apply(List<Object> args, Context context) throws ParseException {

      Map<String, StellarExecutor.VariableResult> variables =
          (Map<String, StellarExecutor.VariableResult>)
              context.getCapability(StellarExecutor.SHELL_VARIABLES).get();
      String[] headers = {"VARIABLE", "VALUE", "EXPRESSION"};
      String[][] data = new String[variables.size()][3];
      int wordWrap = -1;
      if (args.size() > 0) {
        wordWrap = ConversionUtils.convert(args.get(0), Integer.class);
      }
      int i = 0;
      for (Map.Entry<String, StellarExecutor.VariableResult> kv : variables.entrySet()) {
        StellarExecutor.VariableResult result = kv.getValue();
        data[i++] =
            new String[] {
              toWrappedString(kv.getKey().toString(), wordWrap),
              toWrappedString(result.getResult(), wordWrap),
              toWrappedString(result.getExpression(), wordWrap)
            };
      }
      return FlipTable.of(headers, data);
    }