run method

Implementation

@override
Future<void> run() async {
  final currentDir = Directory.current;
  print('Current project directory: ${currentDir.path}');

  final changelogFile = File('${currentDir.path}/CHANGELOG.md');
  final readmeFile = File('${currentDir.path}/README.md');

  // Get the latest git tag (version)
  final latestTagResult = await Process.run('git', [
    'describe',
    '--tags',
    '--abbrev=0',
  ]);
  String latestVersion = 'Unreleased';
  if (latestTagResult.exitCode == 0) {
    latestVersion = (latestTagResult.stdout as String).trim();
  } else {
    print('No git tags found, using "Unreleased" as version.');
  }

  // Get commits since the latest tag or all commits if no tag
  List<String> commits = [];
  if (latestVersion != 'Unreleased') {
    final commitsResult = await Process.run('git', [
      'log',
      '$latestVersion..HEAD',
      '--pretty=format:%s',
    ]);
    if (commitsResult.exitCode == 0) {
      commits = (commitsResult.stdout as String)
          .split('\n')
          .where((c) => c.trim().isNotEmpty)
          .toList();
    }
  } else {
    final commitsResult = await Process.run('git', [
      'log',
      '--pretty=format:%s',
    ]);
    if (commitsResult.exitCode == 0) {
      commits = (commitsResult.stdout as String)
          .split('\n')
          .where((c) => c.trim().isNotEmpty)
          .toList();
    }
  }

  if (commits.isEmpty) {
    print('No new commits found to update CHANGELOG.md');
    return;
  }

  final newVersion = latestVersion == 'Unreleased'
      ? 'v0.1.0'
      : _incrementVersion(latestVersion);

  final changelogEntry = StringBuffer();
  changelogEntry.writeln('## $newVersion\n');
  for (final commit in commits) {
    changelogEntry.writeln('- $commit');
  }
  changelogEntry.writeln();

  String existingChangelog = '';
  if (await changelogFile.exists()) {
    existingChangelog = await changelogFile.readAsString();
  }

  final updatedChangelog = StringBuffer();
  updatedChangelog.writeln(changelogEntry.toString());
  updatedChangelog.writeln(existingChangelog);

  // Write or update CHANGELOG.md
  if (await changelogFile.exists()) {
    // Prepend new entry to existing changelog
    final existingChangelog = await changelogFile.readAsString();
    final updatedChangelogExisting = StringBuffer();
    updatedChangelogExisting.writeln(changelogEntry.toString());
    updatedChangelogExisting.writeln(existingChangelog);
    await changelogFile.writeAsString(updatedChangelogExisting.toString());
    print('CHANGELOG.md updated with version $newVersion');
  } else {
    // Create a new changelog file
    final newChangelog = StringBuffer();
    newChangelog.writeln('# Changelog\n');
    newChangelog.writeln(
      'All notable changes to this project will be documented in this file.',
    );
    newChangelog.writeln();
    newChangelog.writeln(changelogEntry.toString());
    await changelogFile.writeAsString(newChangelog.toString());
    print('CHANGELOG.md created with version $newVersion');
  }

  // Only generate README if it does not already exist. If it exists, skip modifications.
  if (await readmeFile.exists()) {
    print('README.md exists; skipping README generation or updates.');
  } else {
    // Create a minimal README with version and changelog summary
    final changelogSummary = commits.map((c) => '- $c').join('\n');
    final newReadmeContent =
        '''# Project

Latest Version: $newVersion

## Changelog Summary
$changelogSummary

''';
    await readmeFile.writeAsString(newReadmeContent);
    print('README.md created with latest version and changelog summary');
  }
}