Implement Automated Changelog System for CI/CD Integration

[ksylvan]

Implement Automated Changelog System for CI/CD Integration

Summary

This pull request implements a comprehensive automated changelog system for CI/CD integration, adding new functionality to pre-process pull requests during development and aggregate changelog entries during release workflows.

Related Issues

Closes #1630

Files Changed

New Files Added

• cmd/generate_changelog/incoming/1640.txt - Example incoming changelog entry for PR Implement Automated Changelog System for CI/CD Integration #1640
• cmd/generate_changelog/internal/changelog/generator_test.go - Test coverage for changelog generation functionality
• cmd/generate_changelog/internal/changelog/processing.go - Core processing logic for PR handling and release aggregation
• cmd/generate_changelog/internal/changelog/processing_test.go - Comprehensive test suite for processing functionality
• docs/Automated-ChangeLog.md - Technical specification and implementation details
• docs/Automated-Changelog-Usage.md - Developer guide and usage documentation

Modified Files

• .github/workflows/update-version-and-create-tag.yml - Updated CI/CD workflow to integrate changelog processing
• .gitignore - Added .claude/ directory exclusion
• .vscode/settings.json - Added new spell check words for project terminology
• cmd/generate_changelog/internal/config/config.go - Extended configuration with new fields for PR processing
• cmd/generate_changelog/internal/git/walker.go - Added git operations for staging, committing, and pushing changes
• cmd/generate_changelog/internal/github/client.go - Enhanced GitHub API client with validation methods and PR details
• cmd/generate_changelog/internal/github/types.go - Added PRDetails struct for comprehensive PR information
• cmd/generate_changelog/main.go - Added new command-line flags and processing modes

Code Changes

Core Processing Logic (processing.go)

func (g *Generator) ProcessIncomingPR(prNumber int) error
func (g *Generator) CreateNewChangelogEntry(version string) error
func (g *Generator) getDirectCommitsSinceLastRelease(processedPRs map[int]bool, processedCommitSHAs map[string]bool) (string, error)

GitHub API Enhancements (client.go)

func (c *Client) GetPRValidationDetails(prNumber int) (*PRDetails, error)
func (c *Client) GetPRWithCommits(prNumber int) (*PR, error)
func (c *Client) buildPRWithCommits(ctx context.Context, ghPR *github.PullRequest) (*PR, error)

Git Operations (walker.go)

func (w *Walker) IsWorkingDirectoryClean() (bool, error)
func (w *Walker) AddFile(filename string) error
func (w *Walker) CommitChanges(message string) (plumbing.Hash, error)
func (w *Walker) PushToRemote() error

CI/CD Workflow Integration

- name: Generate Changelog Entry
  env:
    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
  run: |
    go run ./cmd/generate_changelog --process-prs ${{ env.new_tag }}

Reason for Changes

This implementation addresses the need for automated changelog generation in CI/CD pipelines while maintaining developer control over content quality. The system eliminates manual CHANGELOG.md editing, reduces merge conflicts, and ensures consistent formatting across releases.

Key motivations:

• Developer Experience: Pre-process PR entries during development with AI-enhanced summaries
• CI/CD Integration: Automatically aggregate entries during release workflows
• Consistency: Standardized formatting and comprehensive coverage of all changes
• Performance: Leverages existing caching and optimization infrastructure

Impact of Changes

Positive Impacts

• Automated Workflow: Developers can generate changelog entries with --incoming-pr flag
• Release Integration: CI/CD automatically processes incoming files with --process-prs
• Reduced Conflicts: No multiple PRs editing CHANGELOG.md simultaneously
• Enhanced Quality: AI-powered summaries provide professional, consistent formatting
• Backward Compatibility: Existing changelog generation remains unchanged

Potential Risks

• Git State Dependencies: Tool requires clean working directory for processing
• GitHub API Rate Limits: Increased API usage for PR validation and commit fetching
• File System Operations: Auto-commit and push functionality requires proper authentication
• Validation Complexity: Multiple validation layers could introduce failure points

Test Plan

The implementation includes comprehensive test coverage:

Unit Tests

• generator_test.go: Version detection, directory creation, changelog insertion
• processing_test.go: File aggregation, error handling, validation logic
• Tests cover edge cases like permission errors, malformed files, and git state validation

Integration Testing

• PR validation workflow with GitHub API
• Git operations including staging, committing, and pushing
• End-to-end processing from incoming files to CHANGELOG.md updates

Manual Testing

• Test with actual PR numbers for validation
• Verify CI/CD integration in GitHub Actions workflow
• Validate file cleanup and git staging operations

Additional Notes

Configuration Extensions

New configuration fields support the automated workflow:

• IncomingPR: PR number for pre-processing
• ProcessPRsVersion: Version string for release aggregation
• IncomingDir: Directory path for incoming PR files
• Push: Enable automatic git push after commits

Error Handling

Robust error handling covers:

• PR state validation (open, mergeable)
• Git working directory cleanliness
• File system permissions and disk space
• Network failures with GitHub API
• Authentication issues for git operations

Developer Workflow

1. Create PR and ensure it's mergeable
2. Run generate_changelog --incoming-pr XXXX --ai-summarize
3. Review generated incoming/XXXX.txt file
4. Commit is auto-created; use --push for automatic remote push
5. PR includes pre-processed changelog entry for review

The system maintains full backward compatibility while providing opt-in automation features that significantly improve the development and release process.