feat: add version display supports.

[kevmoo]

Fixes #38

[gemini-code-assist]

Summary of Changes

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This pull request enhances the dhttpd command-line tool by adding a standard --version flag. This feature improves user experience by providing a straightforward way to query the tool's installed version directly from the terminal, making it easier to manage and troubleshoot installations.

Highlights

• New Feature: Version Display: Introduced a new --version command-line flag for the dhttpd tool, allowing users to easily display the package's current version.
• Version Management: Added a new lib/src/version.dart file to centralize the package version, and integrated the build_version dev dependency for automated version management.
• Documentation and Testing: Updated the README.md documentation and command_test.dart to reflect the new --version flag and ensure its correct behavior.

Changelog

• README.md
  • Documented the newly added --version command-line flag.
• bin/dhttpd.dart
  • Imported the new version.dart file.
  • Implemented logic to print the package version and exit when the --version flag is provided.
• lib/src/options.dart
  • Added a version boolean field to the Options class, annotated with @CliOption.
• lib/src/options.g.dart
  • Updated the generated code to parse the --version flag from ArgResults.
  • Added the --version flag definition to the ArgParser.
• lib/src/version.dart
  • Added a new file to define the packageVersion constant.
• pubspec.yaml
  • Added build_version to dev_dependencies.
• test/command_test.dart
  • Updated the expected help output to include the --version flag.

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[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:dhttpd	4.2.0	ready to publish	v4.2.0

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.

[gemini-code-assist]

Code Review

This pull request adds a --version flag to display the application's version. The implementation correctly uses the build_version package to generate a version file from pubspec.yaml, ensuring the version is always in sync. The changes are well-integrated, with updates to the command-line option parsing, main application logic, tests, and README.

I have a couple of suggestions for improvement:

• Adding a dedicated test case for the new --version flag to ensure its functionality is covered.
• Improving consistency in the Options class constructor for boolean flag parameters.

Overall, this is a solid feature addition.