README

Interactive customization for template projects

The Customizer allows template project authors to ask users questions during the composer create-project command and then update the newly created project based on the received answers.

TL;DR

Run the command below to create a new project from the template project example and see the Customizer in action:

composer create-project alexskrypnyk/template-project-example my-project

Features

• Simple installation into template project
• Runs customization on composer create-project
• Runs customization on composer create-project --no-install via composer customize command
• Configuration file for questions and processing logic
• Test harness for the template project to test questions and processing logic
• No additional dependencies for minimal footprint

Installation

1. Add to the template project as a Composer dependency:

   "require-dev": {
       "alexskrypnyk/customizer": "^0.5"
   },
   "config": {
       "allow-plugins": {
           "alexskrypnyk/customizer": true
       }
   }

   These entries will be removed by the Customizer after your project's users run the composer create-project command.

2. Copy customize.php file with questions and processing logic in any location within your template project and adjust it as needed.

See the Configuration section below for more information.

Usage example

When your users run the composer create-project command, the Customizer will ask them questions and process the answers to customize their instance of the template project.

Run the command below to create a new project from the template project example and see the Customizer in action:

composer create-project alexskrypnyk/template-project-example my-project

In this example, the demonstration questions will ask you to provide a package name, description, and license type. The answers are then processed by updating the composer.json file and replacing the package name in other project files.

--no-install

Your users may run the composer create-project --no-install command if they want to adjust the project before installing dependencies, for example. Customizer will not run in this case as it is not being installed yet and it's dependencies entries will stay in the composer.json file.

The user will have to run composer customize manually to run the Customizer. It could be useful to let your users know about this command in your project's README file.

Configuration

You can configure how the Customizer processes your user’s template project by providing an arbitrary class (with any namespace) in a customize.php file. This includes defining questions and processing logic.

The class has to implement public static methods :

• questions() - defines questions; required
• process() - defines processing logic based on received answers; required
• cleanup() - defines processing logic for the composer.json file; optional
• messages() - defines custom messages seen by the user; optional

questions()

Defines questions, their discovery and validation callbacks. Questions will be asked in the order they are defined. Questions can use answers from previous questions received so far.

The discovery callback is optional and runs before the question is asked. It can be used to discover the default answer based on the current state of the project. The discovered value is passed to the question callback. It can be an anonymous function or a method of the configuration class named discover<QuestionName>.

The validation callback should return the validated answer or throw an exception with a message to be shown to the user. This uses inbuilt SymfonyStyle's ask() method for asking questions.

customize.php has an example of the questions() method.

Note that while the Customizer examples use SymfonyStyle's ask() method, you can build your own question asking logic using any other TUI interaction methods. For example, you can use Laravel Prompts.

process()

Defines processing logic for all answers. This method will be called after all answers are received and the user confirms the intended changes. It has access to all answers and Customizer's class public properties and methods.

All file manipulations should be done within this method.

customize.php has an example of the process() method.

cleanup()

Defines the cleanup() method after all files were processed but before all dependencies are updated.

The Customizer will remove itself from the project and will update the composer.json as required. This method allows to alter that process as needed and, if necessary, cancel the original self-cleanup.

customize.php has an example of the cleanup() method.

messages()

Defines overrides for the Customizer's messages shown to the user.

customize.php has an example of the messages() method.

Example configuration

<?php

declare(strict_types=1);

use AlexSkrypnyk\Customizer\CustomizeCommand;

/**
 * Customizer configuration.
 *
 * Example configuration for the Customizer command.
 *
 * phpcs:disable Drupal.Classes.ClassFileName.NoMatch
 */
class Customize {

  /**
   * A required callback with question definitions.
   *
   * Place questions into this method if you are using Customizer as a
   * single-file drop-in for your scaffold project. Otherwise - place them into
   * the configuration class.
   *
   * Any questions defined in the `questions()` method of the configuration
   * class will **fully override** the questions defined here. This means that
   * the configuration class must provide a full set of questions.
   *
   * See `customize.php` for an example of how to define questions.
   *
   * @return array<string,array<string,string|callable>>
   *   An associative array of questions with question title as a key and the
   *   value of array with the following keys:
   *   - question: Required question callback function used to ask the question.
   *     The callback receives the following arguments:
   *     - discovered: A value discovered by the discover callback or NULL.
   *     - answers: An associative array of all answers received so far.
   *     - command: The CustomizeCommand object.
   *   - discover: Optional callback function used to discover the value from
   *     the environment. Can be an anonymous function or a method of this class
   *     as discover<PascalCasedQuestion>. If not provided, empty string will
   *     be passed to the question callback. The callback receives the following
   *     arguments:
   *     - command: The CustomizeCommand object.
   */
  public static function questions(CustomizeCommand $c): array {
    // This an example of questions that can be asked to customize the project.
    // You can adjust this method to ask questions that are relevant to your
    // project.
    //
    // In this example, we ask for the package name, description, and license.
    //
    // You may remove all the questions below and replace them with your own.
    return [
      'Name' => [
        // The discover callback function is used to discover the value from the
        // environment. In this case, we use the current directory name
        // and the GITHUB_ORG environment variable to generate the package name.
        'discover' => static function (CustomizeCommand $c): string {
          $name = basename((string) getcwd());
          $org = getenv('GITHUB_ORG') ?: 'acme';

          return $org . '/' . $name;
        },
        // The question callback function defines how the question is asked.
        // In this case, we ask the user to provide a package name as a string.
        // The discovery callback is used to provide a default value.
        // The question callback provides a capability to validate the answer
        // before it can be accepted by providing a validation callback.
        'question' => static fn(string $discovered, array $answers, CustomizeCommand $c): mixed => $c->io->ask('Package name', $discovered, static function (string $value): string {
          // This is a validation callback that checks if the package name is
          // valid. If not, an \InvalidArgumentException exception is thrown
          // with a message shown to the user.
          if (!preg_match('/^[a-z0-9_.-]+\/[a-z0-9_.-]+$/', $value)) {
            throw new \InvalidArgumentException(sprintf('The package name "%s" is invalid, it should be lowercase and have a vendor name, a forward slash, and a package name.', $value));
          }

          return $value;
        }),
      ],
      'Description' => [
        // For this question, we use an answer from the previous question
        // in the title of the question.
        'question' => static fn(string $discovered, array $answers, CustomizeCommand $c): mixed => $c->io->ask(sprintf('Description for %s', $answers['Name'])),
      ],
      'License' => [
        // For this question, we use a pre-defined list of options.
        // For discovery, we use a separate method named 'discoverLicense'
        // (only for the demonstration purposes; it could have been an
        // anonymous function).
        'question' => static fn(string $discovered, array $answers, CustomizeCommand $c): mixed => $c->io->choice('License type',
          [
            'MIT',
            'GPL-3.0-or-later',
            'Apache-2.0',
          ],
          // Note that the default value is the value discovered by the
          // 'discoverLicense' method. If the discovery did not return a value,
          // the default value of 'GPL-3.0-or-later' is used.
          empty($discovered) ? 'GPL-3.0-or-later' : $discovered
        ),
      ],
    ];
  }

  /**
   * A callback to discover the `License` value from the environment.
   *
   * This is an example of discovery function as a class method.
   *
   * @param \AlexSkrypnyk\Customizer\CustomizeCommand $c
   *   The Customizer instance.
   */
  public static function discoverLicense(CustomizeCommand $c): string {
    return isset($c->composerjsonData['license']) && is_string($c->composerjsonData['license']) ? $c->composerjsonData['license'] : '';
  }

  /**
   * A required callback to process all answers.
   *
   * This method is called after all questions have been answered and a user
   * has confirmed the intent to proceed with the customization.
   *
   * Note that any manipulation of the composer.json file should be done here
   * and then written back to the file system.
   *
   * @param array<string,string> $answers
   *   Gathered answers.
   * @param \AlexSkrypnyk\Customizer\CustomizeCommand $c
   *   The Customizer instance.
   */
  public static function process(array $answers, CustomizeCommand $c): void {
    $c->debug('Updating composer configuration');
    $json = $c->readComposerJson($c->composerjson);
    $json['name'] = $answers['Name'];
    $json['description'] = $answers['Description'];
    $json['license'] = $answers['License'];
    $c->writeComposerJson($c->composerjson, $json);

    $c->debug('Removing an arbitrary file.');
    $files = $c->finder($c->cwd)->files()->name('LICENSE');
    foreach ($files as $file) {
      $c->fs->remove($file->getRealPath());
    }
  }

  /**
   * Cleanup after the customization.
   *
   * By the time this method is called, all the necessary changes have been made
   * to the project.
   *
   * The Customizer will remove itself from the project and will update the
   * composer.json as required. This method allows to alter that process as
   * needed and, if necessary, cancel the original self-cleanup.
   *
   * @param \AlexSkrypnyk\Customizer\CustomizeCommand $c
   *   The CustomizeCommand object.
   *
   * @return bool
   *   Return FALSE to skip the further self-cleanup. Returning TRUE will
   *   proceed with the self-cleanup.
   */
  public static function cleanup(CustomizeCommand $c): bool {
    if ($c->isComposerDependenciesInstalled) {
      $c->debug('Add an example flag to composer.json.');
      $json = $c->readComposerJson($c->composerjson);
      $json['extra'] = is_array($json['extra']) ? $json['extra'] : [];
      $json['extra']['custom_field'] = TRUE;
      $c->writeComposerJson($c->composerjson, $json);
    }

    return TRUE;
  }

  /**
   * Override some of the messages displayed to the user by Customizer.
   *
   * @param \AlexSkrypnyk\Customizer\CustomizeCommand $c
   *   The Customizer instance.
   *
   * @return array<string,string|array<string>>
   *   An associative array of messages with message name as key and the message
   *   test as a string or an array of strings.
   */
  public static function messages(CustomizeCommand $c): array {
    return [
      // This is an example of a custom message that overrides the default
      // message with name `welcome`.
      'title' => 'Welcome to the "{{ package.name }}" project customizer',
    ];
  }

}

Helpers

The Customizer provides a few helpers to make processing answers easier. These are available as properties and methods of the Customizer instance passed to the processing callbacks:

• cwd - current working directory.
• fs - Symfony Filesystem instance.
• io - Symfony input/output instance.
• isComposerDependenciesInstalled - whether the Composer dependencies were installed before the Customizer started.
• readComposerJson() - Read the contents of the composer.json file into an array.
• writeComposerJson() - Write the contents of the array to the composer.json file.
• replaceInPath() - Replace a string in a file or all files in a directory.
• replaceInPathBetweenMarkers() - Replace a string in a file or all files in a directory between two markers.
• uncommentLine() - Uncomment a line in a file or all files in a directory.
• arrayUnsetDeep() - Unset a fully or partially matched value in a nested array, removing empty arrays.

Validation helpers for questions are not provided in this class, but you can easily create them using custom regular expression or add them from the AlexSkrypnyk/str2name package.

Developing and testing your questions

Testing manually

1. Install the Customizer into your template project as described in the Installation section.
2. Create a new testing directory and change into it.
3. Create a project in this directory:

composer create-project yournamespace/yourscaffold="@dev" --repository '{"type": "path", "url": "/path/to/yourscaffold", "options": {"symlink": false}}' .

1. The Customizer screen should appear.

Repeat the process as many times as needed to test your questions and processing logic.

Add export COMPOSER_ALLOW_XDEBUG=1 before running the composer create-project command to enable debugging with XDebug when running Composer commands.

Automated functional tests

The Customizer provides a test harness to help you, as a template project author, to test the questions and processing with ease.

To use the test harness:

1. Setup PHPUnit in your template project to run tests.
2. Inherit your test classes from CustomizerTestCase.php (this file is included into distribution when you add Customizer to your template project).
3. Add path to CustomizerTestCase.php into the autoload-dev section of your template project's composer.json file:

    "autoload-dev": {
        "psr-4": {
            "AlexSkrypnyk\\Customizer\\Tests\\": "vendor/alexskrypnyk/customizer/tests/phpunit"
        }
    },

4. Create a directory in your project with the name tests/phpunit/Fixtures/<name_of_test_snake_case> and place your test fixtures there. If you use data providers, you can create a sub-directory with the name of the data set within the provider (the top-level key within the data provider).
5. Add fixtures as base/expected directory structures (see below) and assert for the expected results in your test.

See examples within the template project example.

Comparing fixture directories

The base test class CustomizerTestCase.php provides the assertFixtureDirectoryEqualsSut() method to compare a directory under test with the expected results.

The method uses base and expected directories to compare the results: base is used as a state of the project you are testing before the customization ran, and expected is used as an expected result, which will be compared to the actual result after the customization.

Because the projects can have dependencies added during composer install and other files that are not related to the customization, the method allows you to specify the list of files to ignore during the comparison using .gitignore-like syntax with the addition to ignore content changes but still assess the file presence.

See the description in CustomizerTestCase::assertDirectoriesEqual() for more information about the comparison process.

Maintenance

composer install   # Install dependencies.
composer lint      # Check coding standards.
composer lint-fix  # Fix coding standards.
composer test      # Run tests.

This repository was created using the getscaffold.dev project scaffold template