feat(changelog): Detect nested merged branches#76
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Add support for detecting all merged branches including nested merges where branch B merges into branch A, and then A merges into main. Previously, using --first-parent only detected the final merge (A). Now detects both A and B by removing --first-parent and using negative filtering to exclude reverse merges (main→feature). Changes: - Add target_branch input to action.yml (default: main|develop|master) - Remove --first-parent flag from git log commands - Add negative filter: grep -v "Merge branch '(TARGET_BRANCH)' into" - Create test_merged-branches.bats with 12 comprehensive tests Filtering logic: - Excludes: Reverse merges (main→feature) for conflict resolution - Includes: All forward merges (feature→feature and feature→main) Test coverage: - Nested merges (B→A→develop) ✓ - Deep nesting (C→B→A→develop) ✓ - Conflict resolution filtering ✓ - Parallel merges ✓ - Custom target branch patterns ✓ All 41 tests pass (29 existing + 12 new) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Address all recommendations from code review to improve documentation and test coverage: 1. Performance Impact (Recommendation 1): - Add dedicated "Nested Merge Detection" section to README - Document performance considerations and tradeoffs - Note: Minimal impact for typical workflows, 1-2s for large histories 2. Document Intentional --first-parent (Recommendation 3): - Add inline comments explaining why changelog uses --first-parent - Clarify that branch detection does NOT use --first-parent - Document the intentional separation of concerns 3. Fix Test Documentation (Recommendation 4): - Remove confusing "positive filtering" reference - Clarify squash-merge vs separate merge commit scenarios 4. Add Default TARGET_BRANCH Test (Recommendation 5): - New test verifies default fallback behavior when unset - Ensures "(main|develop|master)" default works correctly 5. Document Regex Patterns (Recommendation 6): - Update action.yml description with ERE syntax details - Add example: "(release.*|hotfix.*)" for flexible matching - Explain filtering behavior clearly Documentation improvements: - Add nested merge detection to Features section - Update inputs table with target_branch and use_git_lfs - Enhance generate-changelog.sh environment variables docs - Add test_merged-branches.bats to test running instructions - Expand test coverage list with new scenarios All 42 tests pass (29 existing + 13 new) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Improve input naming for better clarity: - Rename: target_branch → exclude_source_branches - New description: Exclude merged commits of given branches - More intuitive: Clearly indicates these branches are excluded when they are the SOURCE of a merge (e.g., main→feature) Changes: - action.yml: Rename input and update description - generate-changelog.sh: Rename TARGET_BRANCH → EXCLUDE_SOURCE_BRANCHES - test_merged-branches.bats: Update all test variable names - README.md: Update documentation with new naming All 42 tests pass 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
matejsemancik
approved these changes
Nov 21, 2025
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Summary
Add support for detecting all merged branches including nested merges where one feature branch merges into another before merging to main.
Example: Branch B merges into branch A, then A merges into develop
feature-Adetectedfeature-Aandfeature-Bdetected ✅Changes
Core Implementation
--first-parentflag for branch name detection to see all merge commitsgrep -v "Merge branch '(EXCLUDE_SOURCE_BRANCHES)' into"--first-parentfor changelog messages (intentionally follows main branch history only)New Features
exclude_source_branches(default:"(main|develop|master)")"(release.*|hotfix.*)"for flexible matchingmain→featurefor conflict resolution)Documentation
Testing
test_merged-branches.batswith 13 comprehensive testsTest Results
Files Changed
action.yml- Addexclude_source_branchesinputgenerate-changelog.sh- Implement nested merge detectiontest_merged-branches.bats- New comprehensive test suite (470 lines)README.md- Documentation updatesTotal: 4 files changed, +533 lines, -11 lines
Breaking Changes
None - fully backward compatible with existing workflows.
🤖 Generated with Claude Code