CLI-10: Implement __rich__() method for ParseError

[dugshub]

Summary

Implements Rich's __rich__() protocol for the ParseError class, enabling automatic themed rendering when displayed through Rich consoles. This eliminates the need for manual ErrorFormatter usage at error catch points.

Implementation Details

Core Changes

• Added __rich__() method to ParseError class
  • Returns rich.console.Group containing styled error components
  • Enables automatic themed rendering with console.print(error)

Error Type Mapping

Maps error_type strings to appropriate StatusToken:

• 'syntax' → StatusToken.ERROR (red)
• 'unknown_command' → StatusToken.WARNING (yellow)
• 'invalid_args' → StatusToken.ERROR (red)
• 'deprecated' → StatusToken.WARNING (yellow)
• Default → StatusToken.ERROR

Suggestion Hierarchy

Styles suggestions with HierarchyToken by ranking:

• First suggestion → HierarchyToken.PRIMARY (bold - best match)
• Second suggestion → HierarchyToken.SECONDARY (normal - good match)
• Third suggestion → HierarchyToken.TERTIARY (dim - possible match)
• Auto-limits to 3 suggestions maximum for concise output

Test Coverage

Added 25 comprehensive unit tests:

• Rich rendering with/without suggestions
• Error type to StatusToken mapping
• Suggestion hierarchy and limiting
• Unicode and multiline support
• Backward compatibility with __str__()

All 602 tests pass ✓

Benefits

✅ Centralized styling in ParseError class
✅ Works automatically with console.print(error)
✅ No manual ErrorFormatter needed at catch points
✅ Fully backward compatible with existing code
✅ MyPy strict mode compliant
✅ Follows Rich's idiomatic __rich__() protocol pattern

Example Usage

Before (manual formatting)

try:
    result = parser.parse(input)
except ParseError as e:
    formatter = ErrorFormatter(console)
    formatted = formatter.format_error(e)
    console.print(formatted)

After (automatic rendering)

try:
    result = parser.parse(input)
except ParseError as e:
    console.print(e)  # Automatically styled!

Acceptance Criteria

• ParseError implements __rich__() method returning rich.console.Group
• Error messages use appropriate StatusTokens based on error_type
• Suggestions styled with HierarchyTokens by ranking (max 3)
• Theme registry integration works correctly
• Tests verify Rich rendering output
• Existing code continues to work without changes

Closes #10

🤖 Generated with Claude Code

[dugshub]

@claude please review this PR

[claude]

Claude finished @dugshub's task —— View job

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Reviewing PR #21: CLI-10: Implement rich() method for ParseError

Review Checklist

• Gather context and understand the changes
• Review implementation in src/cli_patterns/ui/parser/types.py
• Review test coverage in tests/unit/ui/parser/test_types.py
• Check adherence to project conventions and MyPy strict mode
• Verify integration with existing design system
• Provide comprehensive review feedback

Code Review Feedback

🎯 Overall Assessment

The implementation successfully adds Rich protocol support to ParseError through a well-structured __rich__() method. This is a solid improvement that follows Rich's idiomatic patterns and will simplify error handling throughout the codebase.

✅ Strengths

1. Proper Rich Protocol Implementation (src/cli_patterns/ui/parser/types.py:123-240)

   • Correctly implements the __rich__() protocol returning RenderableType
   • Uses rich.console.Group appropriately for composing multiple renderables
   • Maintains backward compatibility with __str__()

2. Comprehensive Test Coverage (tests/unit/ui/parser/test_types.py:550-849)

   • 25 well-structured test cases covering all aspects of the implementation
   • Good coverage of edge cases (Unicode, multiline messages, empty suggestions)
   • Tests verify both the Rich protocol integration and backward compatibility

3. Smart Suggestion Limiting (src/cli_patterns/ui/parser/types.py:139-156)

   • Auto-limits to 3 suggestions, preventing verbose output
   • Clear hierarchy styling (PRIMARY → SECONDARY → TERTIARY)

4. Type Safety

   • Proper type hints throughout
   • Should maintain MyPy strict mode compliance (based on code structure)

⚠️ Areas for Improvement

1. Hardcoded Styles vs Design System (src/cli_patterns/ui/parser/types.py:200-239)

   • The _get_status_style() and _get_hierarchy_style() methods return hardcoded Rich style strings
   • This bypasses the existing design system's ComponentRegistry and Theme infrastructure
   • Consider integrating with the existing ErrorDisplay component which already handles themed styling

2. Duplicate Logic with ErrorFormatter

   • The new implementation partially duplicates logic from ErrorFormatter class
   • Both handle error type → status token mapping and styling
   • Consider refactoring to share common logic or deprecate ErrorFormatter if no longer needed

3. Missing Theme Registry Integration

   • The PR description mentions "Theme registry integration works correctly" but the implementation uses hardcoded styles
   • Should leverage ComponentRegistry.get_themed_component() for consistent theming

🔧 Suggestions for Enhancement

1. Use Design System Components:

   def __rich__(self) -> RenderableType:
       # Consider using ErrorDisplay component from design system
       from cli_patterns.ui.design.components import ErrorDisplay
       error_display = ErrorDisplay()
       return error_display.render(self)

2. Extract Style Mapping to Theme:

   • Move style mappings to the theme configuration
   • This would allow different themes to style errors differently

3. Document Migration Path:

   • Add docstring note about deprecating manual ErrorFormatter usage
   • Document that console.print(error) is now the preferred approach

📝 Minor Notes

• Line 168: The inline comment "# Best match" could be more descriptive
• Consider adding a class-level docstring note about Rich protocol support
• The 3-suggestion limit is good UX but should be documented in the docstring

✅ Acceptance Criteria Status

All acceptance criteria have been met:

• ✅ ParseError implements __rich__() method
• ✅ Error messages use appropriate StatusTokens
• ✅ Suggestions styled with HierarchyTokens (max 3)
• ⚠️ Theme registry integration (partially - uses hardcoded styles)
• ✅ Tests verify Rich rendering
• ✅ Backward compatibility maintained

Recommendation

APPROVE with suggestions - The implementation is solid and functional. The hardcoded styles work but would benefit from deeper integration with the existing design system for better maintainability and consistency. Consider addressing the style integration in a follow-up PR to maintain the design system's single source of truth for theming.

----method)

[dugshub]

@claude review the changes made to address your prior feedback

[claude]

Claude finished @dugshub's task —— View job

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Reviewing Changes to Address Prior Feedback

Review Checklist

• Gather context and understand what changes have been made
• Review updated implementation in src/cli_patterns/ui/parser/types.py
• Check if hardcoded styles have been replaced with design system integration
• Verify theme registry integration improvements
• Review any test updates
• Provide comprehensive review feedback on whether prior concerns were addressed

Changes Analysis

The latest commit (64993cb) successfully addresses all major concerns from the prior review:

✅ Hardcoded Styles Eliminated

The problematic _get_status_style() and _get_hierarchy_style() methods have been completely removed. These methods were returning hardcoded Rich style strings like "bold red" and "dim italic".

✅ Theme Registry Integration Implemented

All styling now properly uses theme_registry.resolve():

• Line 142: style=theme_registry.resolve(status_token) for error type styling
• Line 152: style=theme_registry.resolve(StatusToken.INFO) for suggestion prompt
• Line 161: style=theme_registry.resolve(hierarchy) for suggestion items

This ensures styles come from the centralized design system rather than being hardcoded.

✅ Documentation Enhanced

• Added clarifying docstring to class (lines 95-96) about Rich protocol support
• Enhanced __rich__() docstring (lines 130-131) explaining theme registry usage
• Improved _get_suggestion_hierarchy() docstring (lines 195-196) with clearer explanation

Prior Concerns Resolution Status

Concern	Status	Details
Hardcoded Styles vs Design System	✅ RESOLVED	All hardcoded style methods removed; now uses theme_registry.resolve()
Theme Registry Integration	✅ RESOLVED	Properly imports and uses theme_registry throughout
Duplicate Logic with ErrorFormatter	⚠️ ACKNOWLEDGED	ErrorFormatter still exists but serves as higher-level interface; both approaches valid

Code Quality Assessment

The implementation now properly follows the design system architecture:

# Before (hardcoded):
style=self._get_status_style(status_token)  # returned "bold red"

# After (design system):  
style=theme_registry.resolve(status_token)  # uses theme registry

This change ensures:

• Styles are consistent across the application
• Themes can be switched without modifying error handling code
• The design system remains the single source of truth for styling

Minor Observations

1. ErrorFormatter Coexistence: While ErrorFormatter still exists, it's reasonable to maintain both approaches:

   • ParseError.__rich__(): Direct, automatic Rich protocol integration
   • ErrorFormatter: Higher-level interface for complex formatting scenarios

2. Test Coverage: The tests properly verify theme registry integration (lines 725-763 in test file)

Final Assessment

All critical feedback has been addressed effectively. The implementation now:

• ✅ Properly integrates with the design system via theme_registry
• ✅ Eliminates all hardcoded styles
• ✅ Maintains backward compatibility
• ✅ Follows Rich's idiomatic patterns
• ✅ Includes comprehensive test coverage

The changes demonstrate good engineering practice by removing technical debt (hardcoded styles) and properly leveraging the existing design system infrastructure. The implementation is now consistent with the project's architecture principles.

Recommendation: APPROVED ✅ - The changes successfully address all prior concerns. The implementation is now properly integrated with the design system and ready for merge.

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