Xun
81 lines
2.6 KiB
Python
81 lines
2.6 KiB
Python
import logging
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import re
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from pathlib import Path
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import yaml
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from .types import SKILL_MD_FILE, Skill, SkillCategory
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logger = logging.getLogger(__name__)
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def parse_skill_file(skill_file: Path, category: SkillCategory, relative_path: Path | None = None) -> Skill | None:
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"""Parse a SKILL.md file and extract metadata.
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Args:
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skill_file: Path to the SKILL.md file.
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category: Category of the skill.
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relative_path: Relative path from the category root to the skill
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directory. Defaults to the skill directory name when omitted.
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Returns:
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Skill object if parsing succeeds, None otherwise.
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"""
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if not skill_file.exists() or skill_file.name != SKILL_MD_FILE:
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return None
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try:
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content = skill_file.read_text(encoding="utf-8")
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# Extract YAML front-matter block between leading ``---`` fences.
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front_matter_match = re.match(r"^---\s*\n(.*?)\n---\s*\n", content, re.DOTALL)
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if not front_matter_match:
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return None
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front_matter_text = front_matter_match.group(1)
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try:
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metadata = yaml.safe_load(front_matter_text)
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except yaml.YAMLError as exc:
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logger.error("Invalid YAML front-matter in %s: %s", skill_file, exc)
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return None
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if not isinstance(metadata, dict):
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logger.error("Front-matter in %s is not a YAML mapping", skill_file)
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return None
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# Extract required fields. Both must be non-empty strings.
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name = metadata.get("name")
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description = metadata.get("description")
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if not name or not isinstance(name, str):
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return None
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if not description or not isinstance(description, str):
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return None
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# Normalise: strip surrounding whitespace that YAML may preserve.
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name = name.strip()
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description = description.strip()
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if not name or not description:
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return None
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license_text = metadata.get("license")
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if license_text is not None:
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license_text = str(license_text).strip() or None
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return Skill(
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name=name,
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description=description,
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license=license_text,
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skill_dir=skill_file.parent,
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skill_file=skill_file,
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relative_path=relative_path or Path(skill_file.parent.name),
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category=category,
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enabled=True, # Actual state comes from the extensions config file.
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)
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except Exception:
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logger.exception("Unexpected error parsing skill file %s", skill_file)
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return None
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