Command Line Flags in Modelica

Here’s the translation of the Go code example for command-line flags to Modelica, formatted in Markdown suitable for Hugo:

In Modelica, there’s no built-in support for command-line flags like in other programming languages. However, we can simulate this behavior by using input parameters to a function. Here’s how we might represent the concept:

function commandLineFlags
  input String word = "foo";
  input Integer numb = 42;
  input Boolean fork = false;
  input String svar = "bar";
  
  output String result;
protected
  String outputString;
algorithm
  outputString := "word: " + word + "\n" +
                  "numb: " + String(numb) + "\n" +
                  "fork: " + String(fork) + "\n" +
                  "svar: " + svar;
  
  result := outputString;
end commandLineFlags;

model CommandLineFlagsExample
  String output;
equation
  output = commandLineFlags(word="opt", numb=7, fork=true, svar="flag");
end CommandLineFlagsExample;

In this Modelica representation:

1. We define a function commandLineFlags that takes input parameters similar to the command-line flags in the original example.

2. Each input parameter has a default value, mimicking the behavior of optional command-line flags.

3. The function constructs a string with the values of all parameters, similar to how the original program prints out the flag values.

4. We then define a model CommandLineFlagsExample that calls this function with specific values, simulating how you might run the program with command-line arguments.

To use this in a Modelica simulation environment:

1. First, load the model into your Modelica simulation environment.

2. Run the simulation. The output variable in the CommandLineFlagsExample model will contain the result string.

3. To experiment with different “flag” values, you would modify the arguments in the commandLineFlags function call within the CommandLineFlagsExample model.

Note that this is a simplification and doesn’t truly replicate the behavior of command-line flags. Modelica, being primarily a modeling language for dynamic systems, doesn’t have a direct equivalent to command-line programs. This example demonstrates how you might represent similar concepts within the constraints of the Modelica language.

In a real Modelica application, you would typically set parameters like these through the modeling environment’s user interface or by modifying the model itself, rather than through command-line flags.