https://github.com/kevmoo/build_cli

A builder that generates an ArgsParser from a class
https://github.com/kevmoo/build_cli

code-generation command-line-parser dart dart-build-system

Last synced: about 2 months ago
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A builder that generates an ArgsParser from a class

• Host: GitHub
• URL: https://github.com/kevmoo/build_cli
• Owner: kevmoo
• License: mit
• Created: 2018-03-19T03:51:57.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2024-07-01T16:08:56.000Z (3 months ago)
• Last Synced: 2024-07-09T00:08:41.657Z (2 months ago)
• Topics: code-generation, command-line-parser, dart, dart-build-system
• Language: Dart
• Homepage: https://pub.dev/packages/build_cli
• Size: 379 KB
• Stars: 51
• Watchers: 6
• Forks: 11
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
[![Dart CI](https://github.com/kevmoo/build_cli/actions/workflows/dart.yml/badge.svg?branch=master)](https://github.com/kevmoo/build_cli/actions/workflows/dart.yml?query=workflow%3Adart+branch%3Amaster)

[![Pub package](https://img.shields.io/pub/v/build_cli.svg)](https://pub.dev/packages/build_cli)

[![package publisher](https://img.shields.io/pub/publisher/build_cli.svg)](https://pub.dev/packages/build_cli/publisher)

Parse command line arguments directly into an annotation class using the 

[Dart Build System][].

# Example

Annotate a class with `@CliOptions()` from [package:build_cli_annotations][].

```dart

import 'package:build_cli_annotations/build_cli_annotations.dart';

part 'example.g.dart';

@CliOptions()

class Options {

  @CliOption(abbr: 'n', help: 'Required. The name to use in the greeting.')

  final String name;

  final bool nameWasParsed;

  late bool yell;

  @CliOption(defaultsTo: Language.en, abbr: 'l')

  late Language displayLanguage;

  @CliOption(negatable: false, help: 'Prints usage information.')

  late bool help;

  Options(this.name, {this.nameWasParsed = false});

}

enum Language { en, es }

```

Configure and run the [Dart Build System][] and a set of helpers is created

to parse the corresponding command line arguments and populate your class.

```dart

void main(List args) {

  var options = parseOptions(args);

  if (!options.nameWasParsed) {

    throw new ArgumentError('You must set `name`.');

  }

  print(options.name);

}

```

# Setup

Add three packages to `pubspec.yaml`:

```yaml

dependencies:

  build_cli_annotations: ^1.0.0

dev_dependencies:

  build_cli: ^1.0.0

  build_runner: ^1.0.0

```

- `build_cli_annotations` is a separate package containing the annotations you

  add to classes and members to tell `build_cli` what to do.

    * If the code you're annotating is in a published directory – `lib`, `bin` –

      put it in the `dependencies` section.

- `build_cli` contains the logic to generate the code.

    * It should almost always be put in `dev_dependencies`.

- `build_runner` contains the logic to run a build and generate code.

    * It should almost always be put in `dev_dependencies`.

# Details

Uses [package:args](https://pub.dev/packages/args) under the covers.

# More examples:

- The package contains a fully documented

  [end-to-end example](https://github.com/kevmoo/build_cli/tree/master/build_cli/example).

- The [test directory](https://github.com/kevmoo/build_cli/tree/master/build_cli/test/src)

  contains implementations that exercise most of the features of this package.

- Also look at the

  [`package:peanut` source code](https://github.com/kevmoo/peanut.dart).

  The `options` files in the

  [`src` directory](https://github.com/kevmoo/peanut.dart/tree/master/lib/src)

  as the interesting files.

[Dart Build System]: https://github.com/dart-lang/build

[package:build_cli_annotations]: https://pub.dev/packages/build_cli_annotations