A basic example of a command-based application.

README.md

#args:command_runner example

A basic example of a command-based application.

The command dart main.dart install [library] will add the library to the main.dart file. For example try dart main.dart install http:http.

Main library: args:command_runner
Main elements: CommandRunner CommandRunner.addCommand
Gist: https://gist.github.com/kasperpeulen/c63885c37e77e1c1ea32

main.dart

import 'dart:io';

import 'package:args/command_runner.dart';
import 'package:grinder/grinder.dart' as grind;

main(List<String> arguments) {
  CommandRunner runner = new CommandRunner("dartnow", "Gist manager.")
    ..addCommand(new InstallCommand());
  runner.run(arguments);
}

class InstallCommand extends Command {
  final name = "install";
  final description = "Install a library to the gist.";

  String get package => argResults.rest[0].split(':')[0];
  String get library => argResults.rest[0].split(':')[1];

  InstallCommand();

  void run() {
    if (package != 'dart') {
      grind.run('pub', arguments: 'global run den install $package'.split(' '));
      grind.run('pub', arguments: 'get'.split(' '));
    }
    addLibray();
    String printMessage = package == 'dart'
        ? 'Added $package:$library to main.dart'
        : 'Added package:$package/$library.dart to main.dart';
    print(printMessage);
  }

  void addLibray() {
    File mainFile = new File('main.dart');
    String mainFileString = mainFile.readAsStringSync();
    String importString = package == 'dart'
        ? "import '$package:$library';"
        : "import 'package:$package/$library.dart';";
    mainFile.writeAsStringSync('$importString\n$mainFileString');
  }
}

pubspec.yaml

name: args.command_runner__CommandRunner_CommandRunner.addCommand
description: |
  A basic example of a command-based application.

  The command `dart main.dart install [library]` will add the library to the
  `main.dart` file. For example try `dart main.dart install http:http`.
homepage: https://gist.github.com/kasperpeulen/c63885c37e77e1c1ea32
environment:
  sdk: '>=1.0.0 <2.0.0'
dependencies:
  args: '>=0.13.2 <0.14.0'
  grinder: '>=0.7.2 <0.8.0'