⚡ Bolt: [performance improvement] Optimize MaterialExtractor iteration loops

[glacy]

💡 What:

• In get_all_exercises (evolutia/material_extractor.py), replaced the $O(N \times M)$ nested loop that matches exercises to solutions with an $O(N)$ pre-computed dictionary lookup (solution_lookup), carefully preserving the original 'first match' fallback logic.
• In extract_by_topic (evolutia/material_extractor.py), hoisted topic.lower() outside of the filesystem iteration loops to avoid redundant string allocations.
• Fixed a bug in extract_from_file where an F821 Undefined name 'result' linting error prevented caching on successful extraction.
• Adjusted unused variable logic on try block caching (cache_entry -> _).

🎯 Why:

• The nested loop for resolving exercises against solutions scales poorly when parsing large repositories with hundreds of exercises. Hash map lookups provide $O(1)$ constant time access.
• Calling .lower() redundantly inside .glob and for loops across file trees incurs unnecessary overhead.

📊 Impact:

• Resolving solutions per exercise is strictly $O(N)$ instead of $O(N^2)$.
• Reduces unnecessary object creation in hot path parsing strings.

🔬 Measurement:

• Run python -m pytest tests/test_exercise_analyzer_cache.py or python -m pytest tests/ to confirm that baseline behavior remains identical.

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PR created automatically by Jules for task 4314469170521182925 started by @glacy

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[Copilot]

Pull request overview

This PR improves the performance of material parsing by optimizing solution lookup during exercise aggregation and reducing repeated string work in topic-based extraction. It also adjusts extract_from_file so successful results can be cached correctly.

Changes:

• Optimizes get_all_exercises() by replacing the nested exercise→solution scan with a per-material dictionary lookup while preserving “first match wins” behavior.
• Hoists topic.lower() in extract_by_topic() to avoid redundant lowercasing during directory iteration.
• Fixes result caching in extract_from_file() and does some small refactors/formatting updates.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
evolutia/material_extractor.py	Performance improvements for solution resolution + minor refactors in caching and topic extraction paths.
evolutia.egg-info/SOURCES.txt	Adds tests/test_markdown_parser.py to the generated sources list.

Comments suppressed due to low confidence (1)

evolutia/material_extractor.py:335

• La validez del caché se decide comparando file_mtime contra _last_scan_timestamp, pero nunca se usa el timestamp almacenado en self._file_cache[file_path] ni el TTL (self._cache_ttl). Esto puede dejar el caché incorrecto/inefectivo (p.ej., TTL anunciado pero no aplicado). Sería más robusto comparar contra el mtime/timestamp guardado para ese archivo y/o invalidar por antigüedad usando _cache_ttl.

            file_mtime = file_path.stat().st_mtime

            # Usar el timestamp de escaneo más reciente para verificar
            if file_mtime > self._last_scan_timestamp:
                return False

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