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"""Configuration loader for hookify plugin.
Loads and parses .claude/hookify.*.local.md files.
"""
import os
import sys
import glob
import re
from typing import List, Optional, Dict, Any
from dataclasses import dataclass, field
@dataclass
class Condition:
"""A single condition for matching."""
field: str # "command", "new_text", "old_text", "file_path", etc.
operator: str # "regex_match", "contains", "equals", etc.
pattern: str # Pattern to match
@classmethod
def from_dict(cls, data: Dict[str, Any]) -> 'Condition':
"""Create Condition from dict."""
return cls(
field=data.get('field', ''),
operator=data.get('operator', 'regex_match'),
pattern=data.get('pattern', '')
)
@dataclass
class Rule:
"""A hookify rule."""
name: str
enabled: bool
event: str # "bash", "file", "stop", "all", etc.
pattern: Optional[str] = None # Simple pattern (legacy)
conditions: List[Condition] = field(default_factory=list)
action: str = "warn" # "warn" or "block" (future)
tool_matcher: Optional[str] = None # Override tool matching
message: str = "" # Message body from markdown
@classmethod
def from_dict(cls, frontmatter: Dict[str, Any], message: str) -> 'Rule':
"""Create Rule from frontmatter dict and message body."""
# Handle both simple pattern and complex conditions
conditions = []
# New style: explicit conditions list
if 'conditions' in frontmatter:
cond_list = frontmatter['conditions']
if isinstance(cond_list, list):
conditions = [Condition.from_dict(c) for c in cond_list]
# Legacy style: simple pattern field
simple_pattern = frontmatter.get('pattern')
if simple_pattern and not conditions:
# Convert simple pattern to condition
# Infer field from event
event = frontmatter.get('event', 'all')
if event == 'bash':
field = 'command'
elif event == 'file':
field = 'new_text'
else:
field = 'content'
conditions = [Condition(
field=field,
operator='regex_match',
pattern=simple_pattern
)]
return cls(
name=frontmatter.get('name', 'unnamed'),
enabled=frontmatter.get('enabled', True),
event=frontmatter.get('event', 'all'),
pattern=simple_pattern,
conditions=conditions,
action=frontmatter.get('action', 'warn'),
tool_matcher=frontmatter.get('tool_matcher'),
message=message.strip()
)
def extract_frontmatter(content: str) -> tuple[Dict[str, Any], str]:
"""Extract YAML frontmatter and message body from markdown.
Returns (frontmatter_dict, message_body).
Supports multi-line dictionary items in lists by preserving indentation.
"""
if not content.startswith('---'):
return {}, content
# Split on --- markers
parts = content.split('---', 2)
if len(parts) < 3:
return {}, content
frontmatter_text = parts[1]
message = parts[2].strip()
# Simple YAML parser that handles indented list items
frontmatter = {}
lines = frontmatter_text.split('\n')
current_key = None
current_list = []
current_dict = {}
in_list = False
in_dict_item = False
for line in lines:
# Skip empty lines and comments
stripped = line.strip()
if not stripped or stripped.startswith('#'):
continue
# Check indentation level
indent = len(line) - len(line.lstrip())
# Top-level key (no indentation or minimal)
if indent == 0 and ':' in line and not line.strip().startswith('-'):
# Save previous list/dict if any
if in_list and current_key:
if in_dict_item and current_dict:
current_list.append(current_dict)
current_dict = {}
frontmatter[current_key] = current_list
in_list = False
in_dict_item = False
current_list = []
key, value = line.split(':', 1)
key = key.strip()
value = value.strip()
if not value:
# Empty value - list or nested structure follows
current_key = key
in_list = True
current_list = []
else:
# Simple key-value pair
value = value.strip('"').strip("'")
if value.lower() == 'true':
value = True
elif value.lower() == 'false':
value = False
frontmatter[key] = value
# List item (starts with -)
elif stripped.startswith('-') and in_list:
# Save previous dict item if any
if in_dict_item and current_dict:
current_list.append(current_dict)
current_dict = {}
item_text = stripped[1:].strip()
# Check if this is an inline dict (key: value on same line)
if ':' in item_text and ',' in item_text:
# Inline comma-separated dict: "- field: command, operator: regex_match"
item_dict = {}
for part in item_text.split(','):
if ':' in part:
k, v = part.split(':', 1)
item_dict[k.strip()] = v.strip().strip('"').strip("'")
current_list.append(item_dict)
in_dict_item = False
elif ':' in item_text:
# Start of multi-line dict item: "- field: command"
in_dict_item = True
k, v = item_text.split(':', 1)
current_dict = {k.strip(): v.strip().strip('"').strip("'")}
else:
# Simple list item
current_list.append(item_text.strip('"').strip("'"))
in_dict_item = False
# Continuation of dict item (indented under list item)
elif indent > 2 and in_dict_item and ':' in line:
# This is a field of the current dict item
k, v = stripped.split(':', 1)
current_dict[k.strip()] = v.strip().strip('"').strip("'")
# Save final list/dict if any
if in_list and current_key:
if in_dict_item and current_dict:
current_list.append(current_dict)
frontmatter[current_key] = current_list
return frontmatter, message
def load_rules(event: Optional[str] = None) -> List[Rule]:
"""Load all hookify rules from .claude directory.
Args:
event: Optional event filter ("bash", "file", "stop", etc.)
Returns:
List of enabled Rule objects matching the event.
"""
rules = []
# Find all hookify.*.local.md files
pattern = os.path.join('.claude', 'hookify.*.local.md')
files = glob.glob(pattern)
for file_path in files:
try:
rule = load_rule_file(file_path)
if not rule:
continue
# Filter by event if specified
if event:
if rule.event != 'all' and rule.event != event:
continue
# Only include enabled rules
if rule.enabled:
rules.append(rule)
except (IOError, OSError, PermissionError) as e:
# File I/O errors - log and continue
print(f"Warning: Failed to read {file_path}: {e}", file=sys.stderr)
continue
except (ValueError, KeyError, AttributeError, TypeError) as e:
# Parsing errors - log and continue
print(f"Warning: Failed to parse {file_path}: {e}", file=sys.stderr)
continue
except Exception as e:
# Unexpected errors - log with type details
print(f"Warning: Unexpected error loading {file_path} ({type(e).__name__}): {e}", file=sys.stderr)
continue
return rules
def load_rule_file(file_path: str) -> Optional[Rule]:
"""Load a single rule file.
Returns:
Rule object or None if file is invalid.
"""
try:
with open(file_path, 'r') as f:
content = f.read()
frontmatter, message = extract_frontmatter(content)
if not frontmatter:
print(f"Warning: {file_path} missing YAML frontmatter (must start with ---)", file=sys.stderr)
return None
rule = Rule.from_dict(frontmatter, message)
return rule
except (IOError, OSError, PermissionError) as e:
print(f"Error: Cannot read {file_path}: {e}", file=sys.stderr)
return None
except (ValueError, KeyError, AttributeError, TypeError) as e:
print(f"Error: Malformed rule file {file_path}: {e}", file=sys.stderr)
return None
except UnicodeDecodeError as e:
print(f"Error: Invalid encoding in {file_path}: {e}", file=sys.stderr)
return None
except Exception as e:
print(f"Error: Unexpected error parsing {file_path} ({type(e).__name__}): {e}", file=sys.stderr)
return None
# For testing
if __name__ == '__main__':
import sys
# Test frontmatter parsing
test_content = """---
name: test-rule
enabled: true
event: bash
pattern: "rm -rf"
---
⚠️ Dangerous command detected!
"""
fm, msg = extract_frontmatter(test_content)
print("Frontmatter:", fm)
print("Message:", msg)
rule = Rule.from_dict(fm, msg)
print("Rule:", rule)
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