ZIO CLI framework: detailed command line interfaces in Java class libraries

ZIO CLI framework: detailed explanation of command line interfaces in Java class libraries Overview: ZIO CLI is a lightweight Command Line Interface framework based on Java that provides a simple and flexible way to build command line tools. Using ZIO CLI, developers can easily define commands, parameters, and options, and add custom logic to these commands. The characteristics of ZIO CLI: 1. Easy to use: ZIO CLI provides a simple API that enables developers to quickly define command-line interfaces. 2. Command and parameter definitions: Through ZIO CLI, commands, parameters, and options can be easily defined, and their names, descriptions, and default values can be specified. 3. Multiple parameter types support: ZIO CLI supports various common parameter types, including strings, integers, floating-point numbers, Boolean values, etc. 4. Command execution logic: Using ZIO CLI, custom logic can be bound to each command and executed at the command line. 5. Error Handling and Help Documents: ZIO CLI provides error handling and automatic generation of help documents, making it easy for users to understand and use command-line tools. Example code: The following is a simple example of how to use ZIO CLI to create a command-line tool that implements addition operations through command-line parameters: import zio.cli._ import zio.{ App => ZIOApp, _ } import zio.console._ object Calculator extends ZIOApp { //Define commands and parameters val addCommand = for { A<- Args. int ("a", "first number") B<- Args. int ("b", "second number") } yield (a, b) Val command=Command ("add", "add two numbers", addCommand){ case (a, b) => PutStrLn (s "Result: ${a+b}") } //Defining Command Line Options val options = CliOptions.default //Launch Command Line Tools override def run(args: List[String]): ZIO[zio.ZEnv, Nothing, ExitCode] = ZIO.fromEither( Cli.parse(args, command, options).map(_.fold(Cli.error(_), identity)) ).exitCode } In the above code, we first defined a 'addCommand' to receive two integers as parameters. Then, we created a command called 'add' using 'Command' and described it as' adding two numbers', with 'addCommand' as its parameter. Finally, we defined the logic for command execution, which involves adding two parameters and printing the result. Using ZIO CLI, we can run this example by executing the following command from the command line: java Calculator add --a 3 --b 5 The running results will output: Result: 8 Summary: Through the ZIO CLI framework, we can easily build command-line tools and add various commands, parameters, and options to them. It provides a flexible and easy-to-use API that enables developers to quickly define command line interfaces and implement corresponding logic. Whether it's a simple command-line tool or a complex command-line application, ZIO CLI is an excellent choice.