Fix CI change detection for generator files

[justin808]

Summary

• Fixes CI not running generator tests when generator files change
• Moves the Generators pattern before Ruby source code in the case statement (bash uses first-match-wins)
• Adds generator spec paths (react_on_rails/spec/react_on_rails/generators/*) to the Generators pattern

Problem

The ci-changes-detector script was not properly detecting changes to generator files because:

1. The "Ruby source code" pattern (react_on_rails/lib/**/*.rb) matched generator files before the "Generators" pattern could match them
2. Generator spec files were not included in the Generators pattern

As a result, when files like lib/generators/react_on_rails/generator_helper.rb changed, the run_generators flag remained false.

Solution

1. Reorder case patterns so Generators comes before Ruby source code
2. Add generator spec paths to the Generators pattern

Test plan

• Tested locally that generator files now trigger run_generators=true
• Tested that non-generator Ruby files still correctly trigger run_ruby_tests=true
• Tested that generator spec files trigger run_generators=true

Fixes #2187

🤖 Generated with Claude Code

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 3acff76 and a95ce8a.

📒 Files selected for processing (1)

• script/ci-changes-detector (6 hunks)

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch jg/fix-2187

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[claude]

Code Review - PR #2189: Fix CI change detection for generator files

✅ Summary

This PR fixes a critical bug where CI wasn't running generator tests when generator files changed. The solution is elegant and correct: reordering case statement patterns to ensure generator files are matched before the broader Ruby source code pattern.

---

🎯 Correctness

Problem identification: Excellent

• The root cause analysis is spot-on: Bash case statements use first-match-wins semantics
• The pattern react_on_rails/lib/**/*.rb was matching generator files at line 85 before the Generators pattern at line 93 could catch them
• This is a classic pattern matching order bug

Solution: Correct

• Moving Generators pattern (line 78-82) before Ruby source code (line 85-88) ensures generator files are caught first
• Adding generator spec paths (react_on_rails/spec/react_on_rails/generators/*|react_on_rails/spec/react_on_rails/generators/**/*) closes the gap for spec file changes
• The fix directly addresses issue CI should run generator tests when generator files change #2187

Pattern matching validation:

• ✅ react_on_rails/lib/generators/* matches top-level generator files (e.g., base_generator.rb)
• ✅ react_on_rails/lib/generators/**/* matches nested files (e.g., templates/base/base/app/controllers/*)
• ✅ Generator spec patterns correctly mirror the source patterns
• ✅ The broader lib/**/*.rb pattern will still catch non-generator Ruby files

---

📝 Code Quality

Strengths:

1. Clear documentation: Comments explain WHY the order matters (MUST be before Ruby source code)
2. Symmetrical fix: Both source files AND spec files are properly categorized
3. Minimal change: Only reorders patterns, doesn't change logic
4. Defensive programming: The Ruby gem-specific specs pattern also has a comment explaining it must come AFTER Generators

Best practices:

• ✅ Follows Bash case statement semantics correctly
• ✅ Maintains existing pattern structure and style
• ✅ Adds explanatory comments for future maintainers
• ✅ Links to issue CI should run generator tests when generator files change #2187 in PR description

---

🧪 Testing

Test plan validation:
The PR author states they tested:

• ✅ Generator files trigger run_generators=true
• ✅ Non-generator Ruby files still trigger run_ruby_tests=true
• ✅ Generator spec files trigger run_generators=true

Testing recommendation:
To verify this fix works as intended, you could add a simple test case to the script or documentation showing example file paths and their expected categorization:

# Generator source → GENERATORS_CHANGED
react_on_rails/lib/generators/react_on_rails/generator_helper.rb

# Generator spec → GENERATORS_CHANGED  
react_on_rails/spec/react_on_rails/generators/install_generator_spec.rb

# Non-generator Ruby → RUBY_CHANGED
react_on_rails/lib/react_on_rails/configuration.rb

However, the logic is straightforward enough that manual testing is sufficient.

---

🔒 Security & Performance

Security: ✅ No security concerns

• Script only analyzes file paths, doesn't execute arbitrary code
• No injection vulnerabilities introduced

Performance: ✅ No performance impact

• Case statement evaluation is O(1) per file
• Reordering doesn't affect execution time

---

🎨 Potential Improvements (Optional)

1. Pattern duplication in comments (line 90 comment)
The comment says "MUST be after Generators to avoid catching generator specs" but the RSpec pattern (react_on_rails/spec/react_on_rails/*|react_on_rails/spec/react_on_rails/**/*) is actually broader than just generator specs.

Consider clarifying:

# Ruby gem-specific specs (MUST be after Generators since this catches ALL specs including generator specs)

2. Pro generators (optional future work)
The comment on line 62 says GENERATORS_CHANGED=false # needs to be duplicated to pro. If there are React on Rails Pro generators, you may want to add a similar pattern for them (e.g., react_on_rails_pro/lib/generators/**/*).

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✅ Final Verdict

LGTM with high confidence. This is a well-executed bug fix that:

• Correctly identifies and fixes the root cause
• Uses proper Bash semantics
• Includes defensive documentation
• Has minimal risk of regression
• Directly solves issue CI should run generator tests when generator files change #2187

Recommendation: Approve and merge. The fix is correct and complete.

---

📚 Related

• Fixes CI should run generator tests when generator files change #2187
• Related to PR Improve SWC compiler detection and default dependencies #2135 (where the issue was discovered)
• Workflow affected: .github/workflows/examples.yml (line 98 checks run_generators)

🤖 Generated by Claude Code

[claude]

Code Review

Summary

This PR fixes a critical bug in CI change detection where generator files weren't triggering generator tests. The fix is correct and well-implemented. ✅

---

✅ What This PR Does Right

1. Correct Root Cause Analysis

   • Identified that bash case statements use first-match-wins semantics
   • The broad pattern react_on_rails/lib/**/*.rb was matching generator files before the specific react_on_rails/lib/generators/* pattern could match

2. Proper Fix - Pattern Ordering

   • Moved Generators pattern BEFORE Ruby source code pattern
   • Added helpful comments explaining WHY order matters
   • This is the standard approach for handling overlapping patterns in case statements

3. Complete Coverage

   • Added generator spec paths (react_on_rails/spec/react_on_rails/generators/*) to the Generators pattern
   • Also reordered RSpec pattern to come AFTER Generators (with explanatory comment)
   • Ensures both generator code AND generator specs trigger the right CI jobs

4. Excellent Documentation

   • Clear PR description with problem/solution/test plan
   • Inline comments in the script explaining the ordering requirement
   • Links to the issue being fixed

---

🔍 Code Quality Analysis

Pattern Matching Logic:

# BEFORE (broken):
react_on_rails/lib/**/*.rb           # Matches lib/generators/foo.rb first ❌
react_on_rails/lib/generators/*      # Never reached for generator files

# AFTER (fixed):
react_on_rails/lib/generators/*      # Matches generators first ✅
react_on_rails/lib/**/*.rb           # Only matches non-generator lib files

The fix follows the correct pattern for bash case statements: most specific patterns first, more general patterns later.

---

🧪 Testing Validation

The PR description claims local testing was done. To verify the fix works, these commands should confirm proper detection:

# Test 1: Generator file should trigger run_generators=true
echo 'react_on_rails/lib/generators/react_on_rails/generator_helper.rb' | \
  ./script/ci-changes-detector origin/master

# Test 2: Generator spec should trigger run_generators=true  
echo 'react_on_rails/spec/react_on_rails/generators/install_generator_spec.rb' | \
  ./script/ci-changes-detector origin/master

# Test 3: Regular Ruby file should NOT trigger run_generators (only run_ruby_tests)
echo 'react_on_rails/lib/react_on_rails/helper.rb' | \
  ./script/ci-changes-detector origin/master

Recommendation: Consider adding these as automated tests in a future PR to prevent regression.

---

🎯 Adherence to CLAUDE.md Guidelines

• ✅ No linting needed - This is a bash script, outside Ruby/JS scope
• ✅ Proper git workflow - References issue CI should run generator tests when generator files change #2187, clear commit message
• ✅ Follows pattern-matching best practices - Specific before general
• ✅ CI will validate - The script itself is tested by CI infrastructure checks

---

🚨 Potential Concerns (Minor)

1. Testing Coverage (Low Priority)

   • The CI change detection script has no automated tests
   • Relies on manual testing and real-world CI runs
   • Suggestion: Future work could add a test suite for this script

2. Pattern Complexity (Informational)

   • The case statement has grown to ~20 patterns
   • Overlapping patterns require careful ordering
   • Mitigation: The new comments help future maintainers understand the order requirements

---

📊 Impact Assessment

Risk Level: 🟢 Low Risk

• Small, focused change
• Fixes an existing bug (doesn't introduce new behavior)
• Only affects CI job selection (doesn't touch application code)

Blast Radius: 🟡 Medium Impact

• Affects which CI jobs run for generator changes
• Will now properly test generators when they change (currently broken)
• May increase CI usage slightly if generator changes were previously skipped

---

✅ Final Verdict

LGTM - Approved 👍

This is a clean, well-documented fix for a real bug. The approach is correct, the implementation is sound, and the PR description is excellent.

Recommendation: Merge once CI passes.

---

🔮 Future Enhancements (Optional, Out of Scope)

For future consideration:

1. Add automated tests for script/ci-changes-detector
2. Consider using a more maintainable pattern matching approach (e.g., explicit prefix checks)
3. Document pattern ordering requirements in the script header comments

---

Great work tracking down this subtle pattern-matching bug! 🎉

[claude]

Code Review: Fix CI change detection for generator files

Summary

This PR correctly fixes a critical bug in the CI change detection logic where generator file changes weren't triggering the appropriate test suite. The solution is sound and well-implemented.

✅ Strengths

1. Correct Root Cause Analysis: The PR accurately identifies that bash case statements use first-match-wins semantics, and the overly broad lib/**/*.rb pattern was catching generator files before the Generators pattern could match them.

2. Proper Ordering: Moving the Generators pattern before the Ruby core source code pattern is the correct fix. The comments explicitly document why this ordering matters:

   • Line 78: # Generators (MUST be before Ruby source code to avoid being caught by lib/**/*.rb)
   • Line 90: # Ruby gem-specific specs (MUST be after Generators since this pattern catches ALL specs including generator specs)

3. Comprehensive Coverage: The fix includes both generator source files AND generator spec files in the Generators pattern, ensuring changes to either trigger the appropriate tests.

4. Consistent Naming: Renaming RUBY_CHANGED → RUBY_CORE_CHANGED and PRO_RUBY_CHANGED → PRO_RUBY_CORE_CHANGED improves clarity and reduces ambiguity about what files trigger this flag.

5. Proper Flag Logic: Line 258 correctly adds GENERATORS_CHANGED to the condition that sets RUN_RUBY_TESTS=true, ensuring generator changes trigger Ruby tests.

🔍 Areas for Improvement

1. CRITICAL: Missing Test Coverage

This script is critical CI infrastructure that determines which test suites run. However, it has zero test coverage. According to CLAUDE.md:

Silent failures are most dangerous: Some failures don't show up in standard CI... If you changed generators → test rake run_rspec:example_basic

Recommendation: Add a test suite for this script:

# spec/script/ci_changes_detector_spec.sh or similar
# Test cases:
# 1. Generator file changes → run_generators=true
# 2. Generator spec changes → run_generators=true  
# 3. Non-generator lib file changes → run_ruby_tests=true, run_generators=false
# 4. Multiple file types → correct flags set

This would prevent future regressions and give confidence that the fix actually works.

2. Manual Testing Validation

The PR description mentions local testing, but doesn't show the actual commands/output. For a CI infrastructure change, I'd expect to see:

# Test 1: Generator file triggers run_generators
echo "lib/generators/react_on_rails/generator_helper.rb" | ./script/ci-changes-detector
# Expected: run_generators=true

# Test 2: Non-generator lib file doesn't trigger run_generators  
echo "lib/react_on_rails/configuration.rb" | ./script/ci-changes-detector
# Expected: run_generators=false, run_ruby_tests=true

Recommendation: Document the actual test commands and outputs in the PR description or as a comment.

3. Pattern Specificity

The current pattern matching is somewhat fragile:

# Line 79: Very broad glob patterns
react_on_rails/lib/generators/*|react_on_rails/lib/generators/**/*

This works, but bash case patterns don't support negative lookaheads. If someone added a file like lib/generators_helper.rb (note: no / after generators), it might not match as expected.

Recommendation: Consider documenting the expected directory structure or adding a comment about the pattern assumptions.

4. Potential Edge Case: Mixed Changes

When a PR changes both generator files AND non-generator lib files, both GENERATORS_CHANGED and RUBY_CORE_CHANGED will be true, which correctly triggers both test suites. This is good, but worth explicitly testing.

🎯 Validation Checklist

Before merging, please verify:

• Test with actual generator file change: Create a test commit that only modifies lib/generators/react_on_rails/generator_helper.rb and verify run_generators=true in CI output
• Test with generator spec change: Create a test commit that only modifies a file in spec/react_on_rails/generators/ and verify run_generators=true
• Test non-generator lib change: Verify that changing lib/react_on_rails/configuration.rb sets run_ruby_tests=true but NOT run_generators=true
• Check CI workflow integration: Verify that when run_generators=true, the actual generator tests run in the CI workflow (check .github/workflows/*.yml to see how this output is used)

🔒 Security & Performance

• No security concerns: This is a detection script that only analyzes file paths
• No performance issues: Script runs quickly as it only processes git diff output

📝 Documentation

The inline comments are excellent and explain the reasoning behind the pattern ordering. Consider adding a brief note to the project's CI documentation about how this detection works.

✅ Verdict

LGTM with minor recommendations. The core fix is correct and solves the reported issue. The main improvement would be adding automated tests for this critical CI infrastructure to prevent future regressions.

The refactoring from RUBY_CHANGED to RUBY_CORE_CHANGED is a nice improvement that makes the code more maintainable.

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Related: This fix should be backported to any long-lived release branches if applicable, as generator test coverage is important for release quality.