Summary - CLI

Combine args, ArgParser and stdin to write a CLI tool.

Summary - CLI

In this group we learned to build CLI tools with Dart. args and ArgParser parse command-line arguments; stdin/stdout provide interactive input/output; cli_util offers configuration and terminal helpers; dcli runs shell commands.

In this summary we will write a small program that brings args and stdout together. The program parses a name option with ArgParser and prints the result with stdout.writeln. This is a small but working example of a real CLI tool.

Exercise CLI summary

Add import 'package:args/args.dart'; and import 'dart:io';. In main create final parser = ArgParser()..addOption('name', abbr: 'n');. Parse with final results = parser.parse(['--name=Ayşe']);. Print with stdout.writeln('Summary: ${results['name']}').

Show example solution

import 'package:args/args.dart';
import 'dart:io';

void main() {
  final parser = ArgParser()..addOption('name', abbr: 'n');
  final results = parser.parse(['--name=Ayşe']);
  stdout.writeln('Summary: ${results["name"]}');
}

Test yourself

Which package parses CLI arguments?
- jaspr
- sqflite
- drift
- args
Show answer

args — the args package parses CLI arguments.
Match the CLI tools

args

Argument parsing
ArgParser

Parser
stdin

Input
dcli

Shell commands

Creating an ArgParser

final parser = ____();

Show answer

final parser = ArgParser();

Next lesson: logging

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