Introduction to dg-cli

dg-cli is a powerful and easy-to-use Command Line Interface (CLI) application development tool that allows developers to create efficient and scalable CLI applications quickly. With dozens of useful APIs, dg-cli simplifies the development process, enabling you to build robust applications with minimal effort.

Key Features and APIs of dg-cli

1. Command Registration

Registering a command is straightforward with dg-cli. Here’s how you can do it:

dg.command('greet', 'Greets the user')
  .action(() => {
    console.log('Hello, user!');
  });

2. Option Parsing

dg-cli makes it easy to parse options provided by the user:

dg.command('build', 'Builds the project')
  .option('-e, --env <type>', 'Specify environment')
  .action((cmd) => {
    console.log(`Building for environment: ${cmd.env}`);
  });

3. Middleware Functions

Middleware can be used to manipulate commands before they are executed:

dg.use((cmd, next) => {
  console.log(`Executing command: ${cmd}`);
  next();
});

4. Error Handling

dg-cli provides robust error handling mechanisms:

dg.command('test', 'Runs tests')
  .action(() => {
    throw new Error('Test error');
  })
  .on('error', (err) => {
    console.error(`Command failed: ${err.message}`);
  });

5. Asynchronous Operations

Handling asynchronous operations is seamless with dg-cli:

dg.command('fetch', 'Fetches data from API')
  .action(async () => {
    const data = await fetchData();
    console.log('Data fetched:', data);
  });

Application Example Using dg-cli

Let’s build a simple CLI application that greets the user, builds a project, and fetches data:

const dg = require('dg-cli');

dg.command('greet', 'Greets the user')
  .action(() => {
    console.log('Hello, user!');
  });

dg.command('build', 'Builds the project')
  .option('-e, --env <type>', 'Specify environment')
  .action((cmd) => {
    console.log(`Building for environment: ${cmd.env}`);
  });

dg.command('fetch', 'Fetches data from API')
  .action(async () => {
    const data = await fetchData();
    console.log('Data fetched:', data);
  });

dg.parse(process.argv);

With dg-cli, you can create a powerful CLI application with just a few lines of code!

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