ZIO CLI Framework: Steps and Methods for Developing Command Line Tools in Java Class Libraries
ZIO CLI Framework: Steps and Methods for Developing Command Line Tools in Java Class Libraries
Overview:
ZIO CLI is a command line interface (CLI) development framework based on Java class libraries, providing convenient tools and methods that enable developers to quickly build powerful command line tools. This article will introduce the steps and solutions for developing Java class library command-line tools using the ZIO CLI framework, and provide some sample code to help readers understand.
Step:
The following are the basic steps for developing Java class library command-line tools using the ZIO CLI framework:
Step 1: Import ZIO CLI library
Firstly, you need to import the ZIO CLI library into the project. It can be added as a dependency of the project through building tools such as Maven or Gradle. For example, using Maven:
<dependency>
<groupId>dev.zio</groupId>
<artifactId>zio-cli_2.13</artifactId>
<version>0.3.0</version>
</dependency>
Step 2: Define command line options and parameters
Before developing command-line tools, decide which options and parameters are needed. You can define them using the annotations provided by ZIO CLI. For example, the @ command annotation is used to mark a class as an entry point for command-line tools, while the @ arg and @ option annotations are used to define parameters and options. Here is an example:
@command(name = "my-tool", description = "A command-line tool")
class MyTool {
@arg(name = "input", description = "Input file")
var input: String = _
@option(name = "output", description = "Output file")
var output: String = _
}
Step 3: Write command line logic
After defining the options and parameters in step 2, it is necessary to write the actual command line logic. You can use @ command annotations for each command line logical method to specify the name and description of the command. For example:
@command(name = "my-command", description = "My command")
def myCommand(): ZIO[Console, IOException, Unit] = {
//TODO: Implement your command-line logic
ZIO.unit
}
Step 4: Build a CLI application
After writing the command line logic, you can build a CLI application. You can use the 'make' method of the CLI to build a CLI instance and use the 'parse' method to parse command line parameters. For example:
val myCLI = CLI.make[MyTool](new MyTool)
val zioEnv = ZEnv.Live
myCLI.parse(args).flatMap(_.map(_.run.map(_ => CheckExitCode.NoError)).getOrElse(ZIO.succeed(CheckExitCode.HELP))).provide(zioEnv).exitCode
Plan:
The solution for developing command line tools for Java class libraries using the ZIO CLI framework is as follows:
Option 1: Define command line options and parameters
Firstly, determine which options and parameters are required for the command-line tool and define them using the annotations provided by ZIO CLI.
Option 2: Write command line logic
According to the requirements of command line tools, write corresponding command line logical methods and mark them with @ command annotations.
Option 3: Building a CLI application
Use the 'make' method of the CLI to build a CLI instance and use the 'parse' method to parse command line parameters. Then the relevant command line logic can be executed.
Example code:
The following is a complete example that demonstrates the steps and solutions for developing command line tools using the ZIO CLI framework:
import dev.zio.cli._
@command(name = "my-tool", description = "A command-line tool")
class MyTool {
@arg(name = "input", description = "Input file")
var input: String = _
@option(name = "output", description = "Output file")
var output: String = _
@command(name = "my-command", description = "My command")
def myCommand(): ZIO[Console, IOException, Unit] = {
//TODO: Implement your command-line logic
ZIO.unit
}
}
object MyToolApp extends App {
def run(args: List[String]): ZIO[ZEnv, Nothing, ExitCode] = {
val myCLI = CLI.make[MyTool](new MyTool)
val zioEnv = ZEnv.Live
myCLI.parse(args).flatMap(_.map(_.run.map(_ => CheckExitCode.NoError)).getOrElse(ZIO.succeed(CheckExitCode.HELP))).provide(zioEnv).exitCode
}
}
Summary:
This article introduces the steps and solutions for developing Java class library command-line tools using the ZIO CLI framework, and uses sample code to help readers understand. By using ZIO CLI, developers can quickly build powerful command-line tools, providing users with an excellent command-line experience.
