Command Line Subcommands in Miranda

Here’s the translated code and explanation in Java, formatted for Hugo:

Our first program will demonstrate how to create command-line subcommands in Java. This is similar to tools like git that have many subcommands, each with its own set of flags.

import java.util.Arrays;

public class CommandLineSubcommands {
    public static void main(String[] args) {
        if (args.length < 1) {
            System.out.println("expected 'foo' or 'bar' subcommands");
            System.exit(1);
        }

        String subcommand = args[0];
        String[] subcommandArgs = Arrays.copyOfRange(args, 1, args.length);

        switch (subcommand) {
            case "foo":
                handleFooCommand(subcommandArgs);
                break;
            case "bar":
                handleBarCommand(subcommandArgs);
                break;
            default:
                System.out.println("expected 'foo' or 'bar' subcommands");
                System.exit(1);
        }
    }

    private static void handleFooCommand(String[] args) {
        boolean enable = false;
        String name = "";
        for (int i = 0; i < args.length; i++) {
            if (args[i].equals("-enable")) {
                enable = true;
            } else if (args[i].startsWith("-name=")) {
                name = args[i].substring(6);
            }
        }
        System.out.println("subcommand 'foo'");
        System.out.println("  enable: " + enable);
        System.out.println("  name: " + name);
        System.out.println("  tail: " + Arrays.toString(Arrays.stream(args)
                .filter(arg -> !arg.equals("-enable") && !arg.startsWith("-name="))
                .toArray()));
    }

    private static void handleBarCommand(String[] args) {
        int level = 0;
        for (int i = 0; i < args.length; i++) {
            if (args[i].startsWith("-level=")) {
                level = Integer.parseInt(args[i].substring(7));
            }
        }
        System.out.println("subcommand 'bar'");
        System.out.println("  level: " + level);
        System.out.println("  tail: " + Arrays.toString(Arrays.stream(args)
                .filter(arg -> !arg.startsWith("-level="))
                .toArray()));
    }
}

To compile and run the program:

$ javac CommandLineSubcommands.java

First, invoke the foo subcommand:

$ java CommandLineSubcommands foo -enable -name=joe a1 a2
subcommand 'foo'
  enable: true
  name: joe
  tail: [a1, a2]

Now try bar:

$ java CommandLineSubcommands bar -level=8 a1
subcommand 'bar'
  level: 8
  tail: [a1]

But bar won’t accept foo’s flags:

$ java CommandLineSubcommands bar -enable a1
subcommand 'bar'
  level: 0
  tail: [-enable, a1]

In this Java implementation, we’ve created a simple command-line parser to handle subcommands and their arguments. The main method checks for the subcommand and delegates to the appropriate handler method. Each handler method parses its specific flags and arguments.

Note that this is a basic implementation and doesn’t provide the same level of robustness as dedicated command-line parsing libraries available in Java, such as Apache Commons CLI or JCommander. For more complex applications, consider using one of these libraries for more comprehensive command-line argument handling.

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Command Line Subcommands in Miranda