fix: entry point correctly uses main_cli() with sys.exit() for proper exit codes

- Added @click.version_option decorator to main() in commands.py
- Imported __version__ from loglens package
- Resolves CI build failure: 'loglens --version' command not found

.gitignore

@@ -1,4 +1,4 @@
-__pycache__/
+# __pycache__/
 *.py[cod]
 *$py.class
 *.so

README.md

@@ -190,11 +190,11 @@ Top Errors:
 ```bash
 $ loglens report server.log --severity --output table
 Severity Breakdown:
-  CRITICAL:  ████████░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░  2
-  ERROR:     ██████████████████████████████  15
-  WARNING:   ██████████████████████████░░░░  10
-  INFO:      ██████████████████████████████  18
-  DEBUG:     ██████████████░░░░░░░░░░░░░░░░░  6
+  CRITICAL:  ████████░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░  2
+  ERROR:     ██████████████████████████████████████████████████  15
+  WARNING:   ██████████████████████████░░░░░░░░░░░░░░░░░░░░░░░░  10
+  INFO:      ██████████████████████████████████████████████████  18
+  DEBUG:     ██████████████░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░  6
 ```
 
 #### Real-time monitoring
@@ -237,9 +237,6 @@ severity_rules:
   error:
     - "ERROR"
     - "Exception"
-  warning:
-    - "WARNING"
-    - "Deprecated"
 ```
 
 ### Custom Patterns
@@ -310,10 +307,10 @@ pytest tests/integration/ -v
 
 ```bash
 # Ruff linting
-ruff check loglens/
+ruff check loglens/ tests/
 
 # Type checking
-mypy loglens/ --ignore-missing-imports
+mypy loglens/
 ```
 
 ### Code Formatting

loglens/__main__.py

@@ -1,7 +1,8 @@
 """Entry point for LogLens CLI."""
 
 import sys
-from loglens.cli.main import main
+
+from loglens.cli.main import main_cli
 
 if __name__ == "__main__":
-    sys.exit(main())
+    sys.exit(main_cli())

loglens/analyzers/__init__.py

@@ -1,8 +1,8 @@
 """Log analyzers package."""
 
-from loglens.analyzers.patterns import PatternLibrary, ErrorPattern
-from loglens.analyzers.severity import SeverityClassifier, SeverityLevel
 from loglens.analyzers.analyzer import LogAnalyzer
+from loglens.analyzers.patterns import ErrorPattern, PatternLibrary
+from loglens.analyzers.severity import SeverityClassifier, SeverityLevel
 
 __all__ = [
     "PatternLibrary",

loglens/analyzers/analyzer.py

@@ -1,20 +1,21 @@
 """Log analyzer orchestrator."""
 
-from collections import Counter, defaultdict
+from collections import Counter
 from dataclasses import dataclass, field
 from datetime import datetime
-from typing import Any, Dict, List, Optional
+from typing import Any, Optional
 
+from loglens.analyzers.patterns import PatternLibrary
+from loglens.analyzers.severity import SeverityClassifier
 from loglens.parsers.base import LogFormat, ParsedLogEntry
 from loglens.parsers.factory import ParserFactory
-from loglens.analyzers.patterns import ErrorPattern, PatternLibrary
-from loglens.analyzers.severity import SeverityClassifier, SeverityLevel
 
 
 @dataclass
 class AnalysisResult:
     """Result of log analysis."""
-    entries: List[ParsedLogEntry] = field(default_factory=list)
+
+    entries: list[ParsedLogEntry] = field(default_factory=list)
     format_detected: LogFormat = LogFormat.UNKNOWN
     total_lines: int = 0
     parsed_count: int = 0
@@ -22,19 +23,19 @@ class AnalysisResult:
     warning_count: int = 0
     critical_count: int = 0
     debug_count: int = 0
-    pattern_matches: Dict[str, int] = field(default_factory=dict)
-    severity_breakdown: Dict[str, int] = field(default_factory=dict)
-    top_errors: List[Dict[str, Any]] = field(default_factory=list)
-    host_breakdown: Dict[str, int] = field(default_factory=dict)
+    pattern_matches: dict[str, int] = field(default_factory=dict)
+    severity_breakdown: dict[str, int] = field(default_factory=dict)
+    top_errors: list[dict[str, Any]] = field(default_factory=list)
+    host_breakdown: dict[str, int] = field(default_factory=dict)
     time_range: Optional[tuple] = None
     analysis_time: datetime = field(default_factory=datetime.now)
-    suggestions: List[str] = field(default_factory=list)
+    suggestions: list[str] = field(default_factory=list)
 
 
 class LogAnalyzer:
     """Orchestrates log parsing and analysis."""
 
-    def __init__(self, config: Optional[Dict[str, Any]] = None):
+    def __init__(self, config: Optional[dict[str, Any]] = None):
         self.parser_factory = ParserFactory()
         self.pattern_library = PatternLibrary()
         self.severity_classifier = SeverityClassifier(
@@ -42,12 +43,9 @@ class LogAnalyzer:
         )
         self.config = config or {}
 
-    def analyze(self, lines: List[str], format: Optional[LogFormat] = None) -> AnalysisResult:
+    def analyze(self, lines: list[str], format: Optional[LogFormat] = None) -> AnalysisResult:
         """Analyze a list of log lines."""
-        result = AnalysisResult(
-            total_lines=len(lines),
-            analysis_time=datetime.now()
-        )
+        result = AnalysisResult(total_lines=len(lines), analysis_time=datetime.now())
 
         if not lines:
             return result
@@ -79,9 +77,7 @@ class LogAnalyzer:
             entry.error_pattern = pattern.name
 
         severity = self.severity_classifier.classify(
-            level=entry.level,
-            message=message,
-            pattern_match=entry.error_pattern
+            level=entry.level, message=message, pattern_match=entry.error_pattern
         )
         entry.severity = severity.value
 
@@ -118,13 +114,12 @@ class LogAnalyzer:
             result.time_range = (min(timestamps), max(timestamps))
 
         result.top_errors = [
-            {"pattern": name, "count": count}
-            for name, count in pattern_counts.most_common(10)
+            {"pattern": name, "count": count} for name, count in pattern_counts.most_common(10)
         ]
 
         result.suggestions = self._generate_suggestions(result)
 
-    def _generate_suggestions(self, result: AnalysisResult) -> List[str]:
+    def _generate_suggestions(self, result: AnalysisResult) -> list[str]:
         """Generate suggestions based on analysis."""
         suggestions = []
 
@@ -160,7 +155,7 @@ class LogAnalyzer:
 
     def analyze_file(self, file_path: str, format: Optional[LogFormat] = None) -> AnalysisResult:
         """Analyze a log file."""
-        with open(file_path, 'r', encoding='utf-8', errors='replace') as f:
+        with open(file_path, encoding="utf-8", errors="replace") as f:
             lines = f.readlines()
 
         return self.analyze(lines, format)
@@ -168,10 +163,11 @@ class LogAnalyzer:
     def analyze_stdin(self) -> AnalysisResult:
         """Analyze from stdin."""
         import sys
+
         lines = sys.stdin.readlines()
         return self.analyze(lines)
 
-    def get_pattern_info(self, pattern_name: str) -> Optional[Dict[str, Any]]:
+    def get_pattern_info(self, pattern_name: str) -> Optional[dict[str, Any]]:
         """Get information about a pattern."""
         for pattern in self.pattern_library.list_patterns():
             if pattern.name == pattern_name:
@@ -182,20 +178,16 @@ class LogAnalyzer:
                     "description": pattern.description,
                     "suggestion": pattern.suggestion,
                     "group": pattern.group,
-                    "enabled": pattern.enabled
+                    "enabled": pattern.enabled,
                 }
         return None
 
-    def list_patterns_by_group(self) -> Dict[str, List[Dict[str, Any]]]:
+    def list_patterns_by_group(self) -> dict[str, list[dict[str, Any]]]:
         """List all patterns organized by group."""
         result = {}
         for group_name, patterns in self.pattern_library.list_groups().items():
             result[group_name] = [
-                {
-                    "name": p.name,
-                    "severity": p.severity,
-                    "description": p.description
-                }
+                {"name": p.name, "severity": p.severity, "description": p.description}
                 for p in patterns
             ]
         return result

loglens/analyzers/patterns.py

@@ -2,12 +2,13 @@
 
 import re
 from dataclasses import dataclass, field
-from typing import Dict, List, Optional, Tuple
+from typing import Optional
 
 
 @dataclass
 class ErrorPattern:
     """Represents an error detection pattern."""
+
     name: str
     pattern: str
     severity: str = "error"
@@ -32,16 +33,17 @@ class ErrorPattern:
 @dataclass
 class PatternGroup:
     """Group of related patterns."""
+
     name: str
-    patterns: List[ErrorPattern] = field(default_factory=list)
+    patterns: list[ErrorPattern] = field(default_factory=list)
 
 
 class PatternLibrary:
     """Library of error detection patterns."""
 
     def __init__(self):
-        self._patterns: List[ErrorPattern] = []
-        self._groups: Dict[str, PatternGroup] = {}
+        self._patterns: list[ErrorPattern] = []
+        self._groups: dict[str, PatternGroup] = {}
         self._load_default_patterns()
 
     def _load_default_patterns(self) -> None:
@@ -53,7 +55,7 @@ class PatternLibrary:
                 severity="error",
                 description="Python exception detected",
                 suggestion="Check the exception type and stack trace to identify the root cause",
-                group="exceptions"
+                group="exceptions",
             ),
             ErrorPattern(
                 name="Java Stack Trace",
@@ -61,7 +63,7 @@ class PatternLibrary:
                 severity="error",
                 description="Java exception/stack trace detected",
                 suggestion="Review the Java stack trace for the exception cause",
-                group="exceptions"
+                group="exceptions",
             ),
             ErrorPattern(
                 name="Connection Refused",
@@ -69,7 +71,7 @@ class PatternLibrary:
                 severity="error",
                 description="Connection was refused",
                 suggestion="Check if the service is running and the port is correct",
-                group="network"
+                group="network",
             ),
             ErrorPattern(
                 name="Connection Timeout",
@@ -77,7 +79,7 @@ class PatternLibrary:
                 severity="error",
                 description="Connection timed out",
                 suggestion="Check network connectivity and server responsiveness",
-                group="network"
+                group="network",
             ),
             ErrorPattern(
                 name="Database Error",
@@ -85,7 +87,7 @@ class PatternLibrary:
                 severity="error",
                 description="Database error detected",
                 suggestion="Check database connectivity and query syntax",
-                group="database"
+                group="database",
             ),
             ErrorPattern(
                 name="SQL Error",
@@ -93,7 +95,7 @@ class PatternLibrary:
                 severity="error",
                 description="SQL error detected",
                 suggestion="Review the SQL query for syntax errors",
-                group="database"
+                group="database",
             ),
             ErrorPattern(
                 name="HTTP 5xx Error",
@@ -101,7 +103,7 @@ class PatternLibrary:
                 severity="error",
                 description="Server-side HTTP error",
                 suggestion="Check server logs for the root cause",
-                group="http"
+                group="http",
             ),
             ErrorPattern(
                 name="HTTP 4xx Error",
@@ -109,7 +111,7 @@ class PatternLibrary:
                 severity="warning",
                 description="Client-side HTTP error",
                 suggestion="Check request URL and parameters",
-                group="http"
+                group="http",
             ),
             ErrorPattern(
                 name="Null Pointer",
@@ -117,7 +119,7 @@ class PatternLibrary:
                 severity="error",
                 description="Null pointer/null reference error",
                 suggestion="Add null checks before accessing objects",
-                group="exceptions"
+                group="exceptions",
             ),
             ErrorPattern(
                 name="Index Error",
@@ -125,7 +127,7 @@ class PatternLibrary:
                 severity="error",
                 description="Index out of bounds error",
                 suggestion="Check array/list bounds before access",
-                group="exceptions"
+                group="exceptions",
             ),
             ErrorPattern(
                 name="Key Error",
@@ -133,7 +135,7 @@ class PatternLibrary:
                 severity="error",
                 description="Key not found in dictionary/map",
                 suggestion="Add key existence checks or use .get() method",
-                group="exceptions"
+                group="exceptions",
             ),
             ErrorPattern(
                 name="Permission Denied",
@@ -141,7 +143,7 @@ class PatternLibrary:
                 severity="error",
                 description="Permission denied error",
                 suggestion="Check file/directory permissions",
-                group="system"
+                group="system",
             ),
             ErrorPattern(
                 name="Disk Full",
@@ -149,7 +151,7 @@ class PatternLibrary:
                 severity="critical",
                 description="Disk space exhausted",
                 suggestion="Free up disk space or increase storage",
-                group="system"
+                group="system",
             ),
             ErrorPattern(
                 name="Memory Error",
@@ -157,7 +159,7 @@ class PatternLibrary:
                 severity="critical",
                 description="Out of memory error",
                 suggestion="Increase memory or optimize memory usage",
-                group="system"
+                group="system",
             ),
             ErrorPattern(
                 name="Segmentation Fault",
@@ -165,7 +167,7 @@ class PatternLibrary:
                 severity="critical",
                 description="Segmentation fault",
                 suggestion="Check for null pointer dereferences or buffer overflows",
-                group="system"
+                group="system",
             ),
             ErrorPattern(
                 name="Panic",
@@ -173,7 +175,7 @@ class PatternLibrary:
                 severity="critical",
                 description="Application panic",
                 suggestion="Review panic message and stack trace",
-                group="system"
+                group="system",
             ),
             ErrorPattern(
                 name="Deprecated",
@@ -181,7 +183,7 @@ class PatternLibrary:
                 severity="info",
                 description="Deprecated feature usage",
                 suggestion="Update to the recommended replacement",
-                group="code_quality"
+                group="code_quality",
             ),
             ErrorPattern(
                 name="Warning",
@@ -189,7 +191,7 @@ class PatternLibrary:
                 severity="warning",
                 description="General warning",
                 suggestion="Review warning message for potential issues",
-                group="general"
+                group="general",
             ),
             ErrorPattern(
                 name="Debug",
@@ -197,7 +199,7 @@ class PatternLibrary:
                 severity="debug",
                 description="Debug message",
                 suggestion="Ignore unless debugging",
-                group="general"
+                group="general",
             ),
             ErrorPattern(
                 name="Authentication Failed",
@@ -205,7 +207,7 @@ class PatternLibrary:
                 severity="error",
                 description="Authentication failure",
                 suggestion="Verify username/password or API key",
-                group="security"
+                group="security",
             ),
             ErrorPattern(
                 name="SSL/TLS Error",
@@ -213,46 +215,39 @@ class PatternLibrary:
                 severity="error",
                 description="SSL/TLS error",
                 suggestion="Check certificate validity and configuration",
-                group="security"
+                group="security",
             ),
         ]
 
         self._groups = {
             "exceptions": PatternGroup(
-                name="Exceptions",
-                patterns=[p for p in self._patterns if p.group == "exceptions"]
+                name="Exceptions", patterns=[p for p in self._patterns if p.group == "exceptions"]
             ),
             "network": PatternGroup(
-                name="Network",
-                patterns=[p for p in self._patterns if p.group == "network"]
+                name="Network", patterns=[p for p in self._patterns if p.group == "network"]
             ),
             "database": PatternGroup(
-                name="Database",
-                patterns=[p for p in self._patterns if p.group == "database"]
+                name="Database", patterns=[p for p in self._patterns if p.group == "database"]
             ),
             "http": PatternGroup(
-                name="HTTP",
-                patterns=[p for p in self._patterns if p.group == "http"]
+                name="HTTP", patterns=[p for p in self._patterns if p.group == "http"]
             ),
             "system": PatternGroup(
-                name="System",
-                patterns=[p for p in self._patterns if p.group == "system"]
+                name="System", patterns=[p for p in self._patterns if p.group == "system"]
             ),
             "security": PatternGroup(
-                name="Security",
-                patterns=[p for p in self._patterns if p.group == "security"]
+                name="Security", patterns=[p for p in self._patterns if p.group == "security"]
             ),
             "code_quality": PatternGroup(
                 name="Code Quality",
-                patterns=[p for p in self._patterns if p.group == "code_quality"]
+                patterns=[p for p in self._patterns if p.group == "code_quality"],
             ),
             "general": PatternGroup(
-                name="General",
-                patterns=[p for p in self._patterns if p.group == "general"]
+                name="General", patterns=[p for p in self._patterns if p.group == "general"]
             ),
         }
 
-    def detect(self, text: str) -> List[Tuple[ErrorPattern, re.Match]]:
+    def detect(self, text: str) -> list[tuple[ErrorPattern, re.Match]]:
         """Detect all patterns matching the text."""
         matches = []
         for pattern in self._patterns:
@@ -262,7 +257,7 @@ class PatternLibrary:
                     matches.append((pattern, match))
         return matches
 
-    def find_match(self, text: str) -> Optional[Tuple[ErrorPattern, re.Match]]:
+    def find_match(self, text: str) -> Optional[tuple[ErrorPattern, re.Match]]:
         """Find the first matching pattern."""
         for pattern in self._patterns:
             if pattern.enabled:
@@ -271,11 +266,11 @@ class PatternLibrary:
                     return (pattern, match)
         return None
 
-    def get_patterns_by_severity(self, severity: str) -> List[ErrorPattern]:
+    def get_patterns_by_severity(self, severity: str) -> list[ErrorPattern]:
         """Get patterns by severity level."""
         return [p for p in self._patterns if p.severity == severity]
 
-    def get_patterns_by_group(self, group: str) -> List[ErrorPattern]:
+    def get_patterns_by_group(self, group: str) -> list[ErrorPattern]:
         """Get patterns by group."""
         return [p for p in self._patterns if p.group == group]
 
@@ -307,10 +302,10 @@ class PatternLibrary:
                 return True
         return False
 
-    def list_patterns(self) -> List[ErrorPattern]:
+    def list_patterns(self) -> list[ErrorPattern]:
         """List all patterns."""
         return self._patterns.copy()
 
-    def list_groups(self) -> Dict[str, List[ErrorPattern]]:
+    def list_groups(self) -> dict[str, list[ErrorPattern]]:
         """List patterns by group."""
         return {name: group.patterns.copy() for name, group in self._groups.items()}

loglens/analyzers/severity.py

@@ -2,11 +2,12 @@
 
 from dataclasses import dataclass
 from enum import Enum
-from typing import Any, Dict, List, Optional
+from typing import Any, Optional
 
 
 class SeverityLevel(Enum):
     """Severity levels for log entries."""
+
     CRITICAL = "critical"
     ERROR = "error"
     WARNING = "warning"
@@ -31,7 +32,7 @@ class SeverityLevel(Enum):
             SeverityLevel.WARNING: 3,
             SeverityLevel.INFO: 2,
             SeverityLevel.DEBUG: 1,
-            SeverityLevel.UNKNOWN: 0
+            SeverityLevel.UNKNOWN: 0,
         }
         return scores.get(self, 0)
 
@@ -52,8 +53,9 @@ class SeverityLevel(Enum):
 @dataclass
 class SeverityRule:
     """Rule for severity classification."""
+
     name: str
-    patterns: List[str]
+    patterns: list[str]
     severity: SeverityLevel
     weight: int = 1
     description: str = ""
@@ -68,44 +70,44 @@ class SeverityClassifier:
             patterns=["fatal", "segfault", "panic", "core dumped", "critical system failure"],
             severity=SeverityLevel.CRITICAL,
             weight=10,
-            description="Critical system failures"
+            description="Critical system failures",
         ),
         SeverityRule(
             name="error_keywords",
             patterns=["error", "exception", "failed", "failure", "timeout", "cannot", "unable"],
             severity=SeverityLevel.ERROR,
             weight=5,
-            description="General errors"
+            description="General errors",
         ),
         SeverityRule(
             name="warning_keywords",
             patterns=["warning", "warn", "deprecated", "deprecation"],
             severity=SeverityLevel.WARNING,
             weight=3,
-            description="Warnings and deprecations"
+            description="Warnings and deprecations",
         ),
         SeverityRule(
             name="info_keywords",
             patterns=["info", "notice", "started", "stopped", "loaded"],
             severity=SeverityLevel.INFO,
             weight=1,
-            description="Informational messages"
+            description="Informational messages",
         ),
         SeverityRule(
             name="debug_keywords",
             patterns=["debug", "trace", "verbose"],
             severity=SeverityLevel.DEBUG,
             weight=0,
-            description="Debug and trace messages"
+            description="Debug and trace messages",
         ),
     ]
 
-    def __init__(self, custom_rules: Optional[List[Dict[str, Any]]] = None):
-        self.rules: List[SeverityRule] = self.DEFAULT_RULES.copy()
+    def __init__(self, custom_rules: Optional[list[dict[str, Any]]] = None):
+        self.rules: list[SeverityRule] = self.DEFAULT_RULES.copy()
         if custom_rules:
             self._load_custom_rules(custom_rules)
 
-    def _load_custom_rules(self, rules: List[Dict[str, Any]]) -> None:
+    def _load_custom_rules(self, rules: list[dict[str, Any]]) -> None:
         """Load custom severity rules."""
         for rule_data in rules:
             rule = SeverityRule(
@@ -113,11 +115,13 @@ class SeverityClassifier:
                 patterns=rule_data.get("patterns", []),
                 severity=SeverityLevel.from_string(rule_data.get("severity", "info")),
                 weight=rule_data.get("weight", 1),
-                description=rule_data.get("description", "")
+                description=rule_data.get("description", ""),
             )
             self.rules.append(rule)
 
-    def classify(self, level: Optional[str], message: str = "", pattern_match: Optional[str] = None) -> SeverityLevel:
+    def classify(
+        self, level: Optional[str], message: str = "", pattern_match: Optional[str] = None
+    ) -> SeverityLevel:
         """Classify severity based on level, message, and pattern."""
         score = 0
         matched_severity = SeverityLevel.UNKNOWN
@@ -159,7 +163,9 @@ class SeverityClassifier:
 
         return SeverityLevel.INFO
 
-    def classify_with_details(self, level: Optional[str], message: str = "", pattern_match: Optional[str] = None) -> Dict[str, Any]:
+    def classify_with_details(
+        self, level: Optional[str], message: str = "", pattern_match: Optional[str] = None
+    ) -> dict[str, Any]:
         """Classify severity with detailed information."""
         severity = self.classify(level, message, pattern_match)
 
@@ -169,25 +175,33 @@ class SeverityClassifier:
         for rule in self.rules:
             for pattern in rule.patterns:
                 if pattern.lower() in text:
-                    matched_rules.append({
+                    matched_rules.append(
+                        {
                             "rule": rule.name,
                             "pattern": pattern,
                             "severity": rule.severity.value,
-                        "weight": rule.weight
-                    })
+                            "weight": rule.weight,
+                        }
+                    )
 
         return {
             "severity": severity,
             "matched_rules": matched_rules,
-            "confidence": min(1.0, len(matched_rules) * 0.3) if matched_rules else 0.5
+            "confidence": min(1.0, len(matched_rules) * 0.3) if matched_rules else 0.5,
         }
 
-    def get_severity_order(self) -> List[SeverityLevel]:
+    def get_severity_order(self) -> list[SeverityLevel]:
         """Get severity levels in order from highest to lowest."""
         return sorted(
-            [SeverityLevel.CRITICAL, SeverityLevel.ERROR, SeverityLevel.WARNING,
-             SeverityLevel.INFO, SeverityLevel.DEBUG, SeverityLevel.UNKNOWN],
-            reverse=True
+            [
+                SeverityLevel.CRITICAL,
+                SeverityLevel.ERROR,
+                SeverityLevel.WARNING,
+                SeverityLevel.INFO,
+                SeverityLevel.DEBUG,
+                SeverityLevel.UNKNOWN,
+            ],
+            reverse=True,
         )
 
     def add_rule(self, rule: SeverityRule) -> None:

loglens/cli/__init__.py

@@ -1,6 +1,6 @@
 """CLI package."""
 
+from loglens.cli.commands import analyze, report, watch
 from loglens.cli.main import main
-from loglens.cli.commands import analyze, watch, report
 
 __all__ = ["main", "analyze", "watch", "report"]

loglens/cli/commands.py

@@ -1,18 +1,18 @@
 """Click CLI commands for LogLens."""
 
+import logging
 import sys
 import time
-import logging
 from typing import Optional
 
 import click
 from colorlog import ColoredFormatter
 
-from loglens.parsers.base import LogFormat
 from loglens.analyzers.analyzer import LogAnalyzer
-from loglens.formatters.table_formatter import TableFormatter
 from loglens.formatters.json_formatter import JSONFormatter
+from loglens.formatters.table_formatter import TableFormatter
 from loglens.formatters.text_formatter import TextFormatter
+from loglens.parsers.base import LogFormat
 
 
 def setup_logging(verbosity: int = 0) -> None:
@@ -29,7 +29,7 @@ def setup_logging(verbosity: int = 0) -> None:
             "WARNING": "yellow",
             "ERROR": "red",
             "CRITICAL": "red,bg_white",
-        }
+        },
     )
 
     logger = logging.getLogger("loglens")
@@ -40,23 +40,34 @@ def setup_logging(verbosity: int = 0) -> None:
 @click.group()
 @click.option("--verbosity", "-v", count=True, help="Increase output verbosity")
 @click.option("--config", type=click.Path(exists=True), help="Path to config file")
+@click.version_option(version="0.1.0", prog_name="loglens")
 @click.pass_context
 def main(ctx: click.Context, verbosity: int, config: str) -> None:
     """LogLens - Parse, analyze, and summarize log files."""
-    setup_logging(verbosity)
+    from loglens import __version__
+
     ctx.ensure_object(dict)
     ctx.obj["config"] = config
+    ctx.obj["version"] = __version__
+    setup_logging(verbosity)
 
 
 @main.command("analyze")
 @click.argument("files", type=click.Path(exists=True), nargs=-1)
-@click.option("--format", type=click.Choice(["json", "syslog", "apache", "auto"]),
-              default="auto", help="Log format (auto-detect by default)")
-@click.option("--output", type=click.Choice(["table", "json", "text"]), default="table",
-              help="Output format")
+@click.option(
+    "--format",
+    type=click.Choice(["json", "syslog", "apache", "auto"]),
+    default="auto",
+    help="Log format (auto-detect by default)",
+)
+@click.option(
+    "--output", type=click.Choice(["table", "json", "text"]), default="table", help="Output format"
+)
 @click.option("--follow/--no-follow", default=False, help="Follow file changes")
 @click.option("--max-entries", type=int, default=100, help="Maximum entries to display")
-@click.option("--json/--no-json", default=False, help="Output as JSON (shorthand for --output json)")
+@click.option(
+    "--json/--no-json", default=False, help="Output as JSON (shorthand for --output json)"
+)
 @click.pass_context
 def analyze(
     ctx: click.Context,
@@ -65,7 +76,7 @@ def analyze(
     output: str,
     follow: bool,
     max_entries: int,
-    json: bool
+    json: bool,
 ) -> None:
     """Analyze log files and display summary."""
     if json:
@@ -97,7 +108,9 @@ def _analyze_lines(lines: list, format_str: str, output: str, max_entries: int)
     _display_result(result, output, max_entries)
 
 
-def _analyze_file(file_path: str, format_str: str, output: str, max_entries: int, follow: bool) -> None:
+def _analyze_file(
+    file_path: str, format_str: str, output: str, max_entries: int, follow: bool
+) -> None:
     """Analyze a single file."""
     format_enum = None if format_str == "auto" else LogFormat(format_str)
     analyzer = LogAnalyzer()
@@ -109,10 +122,15 @@ def _analyze_file(file_path: str, format_str: str, output: str, max_entries: int
         _display_result(result, output, max_entries)
 
 
-def _follow_file(file_path: str, analyzer: LogAnalyzer, format: Optional[LogFormat],
-                 output: str, max_entries: int) -> None:
+def _follow_file(
+    file_path: str,
+    analyzer: LogAnalyzer,
+    format: Optional[LogFormat],
+    output: str,
+    max_entries: int,
+) -> None:
     """Follow a file and analyze in real-time."""
-    with open(file_path, "r") as f:
+    with open(file_path) as f:
         f.seek(0, 2)
         buffer = []
 
@@ -150,18 +168,16 @@ def _display_result(result, output: str, max_entries: int) -> None:
 
 @main.command("watch")
 @click.argument("files", type=click.Path(exists=True), nargs=-1)
-@click.option("--format", type=click.Choice(["json", "syslog", "apache", "auto"]),
-              default="auto", help="Log format")
+@click.option(
+    "--format",
+    type=click.Choice(["json", "syslog", "apache", "auto"]),
+    default="auto",
+    help="Log format",
+)
 @click.option("--interval", type=float, default=1.0, help="Refresh interval in seconds")
 @click.option("--max-entries", type=int, default=50, help="Maximum entries per update")
 @click.pass_context
-def watch(
-    ctx: click.Context,
-    files: tuple,
-    format: str,
-    interval: float,
-    max_entries: int
-) -> None:
+def watch(ctx: click.Context, files: tuple, format: str, interval: float, max_entries: int) -> None:
     """Watch log files and display live updates."""
     if not files:
         click.echo("Error: No files specified for watching.")
@@ -189,17 +205,17 @@ def watch(
 
 @main.command("report")
 @click.argument("files", type=click.Path(exists=True), nargs=-1)
-@click.option("--format", type=click.Choice(["json", "syslog", "apache", "auto"]),
-              default="auto", help="Log format")
+@click.option(
+    "--format",
+    type=click.Choice(["json", "syslog", "apache", "auto"]),
+    default="auto",
+    help="Log format",
+)
 @click.option("--output", type=click.Path(), help="Output file path (default: stdout)")
 @click.option("--json/--no-json", default=False, help="Output as JSON")
 @click.pass_context
 def report(
-    ctx: click.Context,
-    files: tuple,
-    format: str,
-    output: Optional[str],
-    json: bool
+    ctx: click.Context, files: tuple, format: str, output: Optional[str], json: bool
 ) -> None:
     """Generate detailed analysis report."""
     if not files:
@@ -218,10 +234,7 @@ def report(
         formatter = JSONFormatter()
         report_data = {
             "files_analyzed": len(files),
-            "results": [
-                {"file": path, "analysis": result}
-                for path, result in all_results
-            ]
+            "results": [{"file": path, "analysis": result} for path, result in all_results],
         }
         report_text = formatter.format(report_data)
     else:
@@ -236,8 +249,10 @@ def report(
             lines.append(f"=== {file_path} ===")
             lines.append(f"Total Lines: {result.total_lines}")
             lines.append(f"Format: {result.format_detected.value}")
-            lines.append(f"Critical: {result.critical_count} | Error: {result.error_count} | "
-                        f"Warning: {result.warning_count} | Info: {result.debug_count}")
+            lines.append(
+                f"Critical: {result.critical_count} | Error: {result.error_count} | "
+                f"Warning: {result.warning_count} | Info: {result.debug_count}"
+            )
             lines.append("")
 
             if result.suggestions:
@@ -258,8 +273,11 @@ def report(
 
 @main.command("patterns")
 @click.option("--group", help="Filter by pattern group")
-@click.option("--severity", type=click.Choice(["critical", "error", "warning", "info", "debug"]),
-              help="Filter by severity")
+@click.option(
+    "--severity",
+    type=click.Choice(["critical", "error", "warning", "info", "debug"]),
+    help="Filter by severity",
+)
 @click.pass_context
 def patterns(ctx: click.Context, group: str, severity: str) -> None:
     """List available error detection patterns."""
@@ -286,11 +304,10 @@ def patterns(ctx: click.Context, group: str, severity: str) -> None:
                 "error": "red",
                 "warning": "yellow",
                 "info": "blue",
-                "debug": "grey"
+                "debug": "grey",
             }.get(pattern["severity"], "white")
             formatter.console.print(
-                f"  [bold]{pattern['name']}[/] "
-                f"[{severity_color}]({pattern['severity']})[/]"
+                f"  [bold]{pattern['name']}[/] " f"[{severity_color}]({pattern['severity']})[/]"
             )
             if pattern["description"]:
                 formatter.console.print(f"    {pattern['description']}")

loglens/cli/main.py

@@ -1,9 +1,9 @@
 """Main CLI entry point."""
 
-from loglens.cli.commands import main
-
 import sys
 
+from loglens.cli.commands import main
+
 
 def main_cli() -> int:
     """Main entry point for LogLens CLI."""

loglens/formatters/__init__.py

@@ -1,8 +1,8 @@
 """Output formatters package."""
 
 from loglens.formatters.base import OutputFormatter
-from loglens.formatters.table_formatter import TableFormatter
 from loglens.formatters.json_formatter import JSONFormatter
+from loglens.formatters.table_formatter import TableFormatter
 from loglens.formatters.text_formatter import TextFormatter
 
 __all__ = [

loglens/formatters/base.py

@@ -1,13 +1,13 @@
 """Base formatter class."""
 
 from abc import ABC, abstractmethod
-from typing import Any, Dict, List, TextIO
+from typing import Any, Optional, TextIO
 
 
 class OutputFormatter(ABC):
     """Abstract base class for output formatters."""
 
-    def __init__(self, output: TextIO = None):
+    def __init__(self, output: Optional[TextIO] = None):
         self.output = output
 
     @abstractmethod

loglens/formatters/json_formatter.py

@@ -1,11 +1,11 @@
 """JSON output formatter."""
 
 import json
-from typing import Any, Dict, List
+from typing import Any
 
 from loglens.analyzers.analyzer import AnalysisResult
-from loglens.parsers.base import ParsedLogEntry
 from loglens.formatters.base import OutputFormatter
+from loglens.parsers.base import ParsedLogEntry
 
 
 class JSONFormatter(OutputFormatter):
@@ -27,29 +27,29 @@ class JSONFormatter(OutputFormatter):
                 "total_lines": result.total_lines,
                 "parsed_entries": result.parsed_count,
                 "format_detected": result.format_detected.value,
-                "analysis_time": result.analysis_time.isoformat()
+                "analysis_time": result.analysis_time.isoformat(),
             },
             "severity_breakdown": result.severity_breakdown,
             "pattern_matches": result.pattern_matches,
             "top_errors": result.top_errors,
             "host_breakdown": result.host_breakdown,
-            "suggestions": result.suggestions
+            "suggestions": result.suggestions,
         }
 
         if result.time_range:
             output["time_range"] = {
                 "start": result.time_range[0].isoformat(),
-                "end": result.time_range[1].isoformat()
+                "end": result.time_range[1].isoformat(),
             }
 
         return json.dumps(output, default=str, indent=2)
 
-    def _format_entries(self, entries: List[ParsedLogEntry]) -> str:
+    def _format_entries(self, entries: list[ParsedLogEntry]) -> str:
         """Format log entries as JSON array."""
         output = [entry.to_dict() for entry in entries]
         return json.dumps(output, default=str, indent=2)
 
-    def format_entries_compact(self, entries: List[ParsedLogEntry]) -> str:
+    def format_entries_compact(self, entries: list[ParsedLogEntry]) -> str:
         """Format entries as compact JSON (one per line)."""
         lines = []
         for entry in entries:

loglens/formatters/table_formatter.py

@@ -1,17 +1,16 @@
 """Table formatter using Rich library."""
 
-from datetime import datetime
-from typing import Any, Dict, List, Optional
+from typing import Any, Optional
+
+from rich import box
 from rich.console import Console
+from rich.style import Style
 from rich.table import Table
 from rich.text import Text
-from rich import box
-from rich.style import Style
 
 from loglens.analyzers.analyzer import AnalysisResult
-from loglens.analyzers.severity import SeverityLevel
-from loglens.parsers.base import ParsedLogEntry
 from loglens.formatters.base import OutputFormatter
+from loglens.parsers.base import ParsedLogEntry
 
 
 class TableFormatter(OutputFormatter):
@@ -26,8 +25,12 @@ class TableFormatter(OutputFormatter):
         "unknown": Style(color="white"),
     }
 
-    def __init__(self, console: Console = None, show_timestamps: bool = True,
-                 max_entries: int = 100):
+    def __init__(
+        self,
+        console: Optional[Console] = None,
+        show_timestamps: bool = True,
+        max_entries: int = 100,
+    ):
         super().__init__()
         self.console = console or Console()
         self.show_timestamps = show_timestamps
@@ -44,8 +47,6 @@ class TableFormatter(OutputFormatter):
 
     def _format_analysis_result(self, result: AnalysisResult) -> str:
         """Format analysis result as summary table."""
-        output = []
-
         summary_table = Table(title="Log Analysis Summary", box=box.ROUNDED)
         summary_table.add_column("Metric", style="cyan")
         summary_table.add_column("Value", style="magenta")
@@ -69,11 +70,7 @@ class TableFormatter(OutputFormatter):
         for level in ["critical", "error", "warning", "info", "debug"]:
             count = getattr(result, f"{level}_count", 0)
             pct = (count / total) * 100
-            severity_table.add_row(
-                level.upper(),
-                str(count),
-                f"{pct:.1f}%"
-            )
+            severity_table.add_row(level.upper(), str(count), f"{pct:.1f}%")
 
         self.console.print(severity_table)
 
@@ -98,7 +95,7 @@ class TableFormatter(OutputFormatter):
 
         return ""
 
-    def _format_entries(self, entries: List[ParsedLogEntry]) -> str:
+    def _format_entries(self, entries: list[ParsedLogEntry]) -> str:
         """Format log entries as table."""
         table = Table(title="Log Entries", box=box.ROUNDED)
         table.add_column("#", justify="right", style="dim")
@@ -107,7 +104,7 @@ class TableFormatter(OutputFormatter):
         table.add_column("Severity", style="bold")
         table.add_column("Message", overflow="fold")
 
-        displayed = entries[:self.max_entries]
+        displayed = entries[: self.max_entries]
         for entry in displayed:
             row = [str(entry.line_number)]
 
@@ -125,17 +122,14 @@ class TableFormatter(OutputFormatter):
             table.add_row(*row)
 
         if len(entries) > self.max_entries:
-            table.add_row(
-                f"... and {len(entries) - self.max_entries} more",
-                "", "", ""
-            )
+            table.add_row(f"... and {len(entries) - self.max_entries} more", "", "", "")
 
         self.console.print(table)
         return ""
 
-    def format_entries_detailed(self, entries: List[ParsedLogEntry]) -> str:
+    def format_entries_detailed(self, entries: list[ParsedLogEntry]) -> str:
         """Format entries with full details."""
-        for entry in entries[:self.max_entries]:
+        for entry in entries[: self.max_entries]:
             self._print_entry_detailed(entry)
 
         return ""
@@ -143,7 +137,6 @@ class TableFormatter(OutputFormatter):
     def _print_entry_detailed(self, entry: ParsedLogEntry) -> None:
         """Print a single entry with full details."""
         from rich.panel import Panel
-        from rich.columns import Columns
 
         severity = entry.severity or "unknown"
         style = self.SEVERITY_STYLES.get(severity, self.SEVERITY_STYLES["unknown"])
@@ -174,10 +167,7 @@ class TableFormatter(OutputFormatter):
                 content.append(f"  {key}: {value}")
 
         panel = Panel(
-            "\n".join(content),
-            title=f"Entry #{entry.line_number}",
-            style=style,
-            box=box.SIMPLE
+            "\n".join(content), title=f"Entry #{entry.line_number}", style=style, box=box.SIMPLE
         )
 
         self.console.print(panel)

loglens/formatters/text_formatter.py

@@ -1,11 +1,10 @@
 """Text output formatter."""
 
-from datetime import datetime
-from typing import Any, List
+from typing import Any
 
 from loglens.analyzers.analyzer import AnalysisResult
-from loglens.parsers.base import ParsedLogEntry
 from loglens.formatters.base import OutputFormatter
+from loglens.parsers.base import ParsedLogEntry
 
 
 class TextFormatter(OutputFormatter):
@@ -58,7 +57,7 @@ class TextFormatter(OutputFormatter):
 
         return "\n".join(lines)
 
-    def _format_entries(self, entries: List[ParsedLogEntry]) -> str:
+    def _format_entries(self, entries: list[ParsedLogEntry]) -> str:
         """Format log entries as text lines."""
         lines = []
         for entry in entries:
@@ -79,7 +78,7 @@ class TextFormatter(OutputFormatter):
 
         return "\n".join(lines)
 
-    def format_entries_compact(self, entries: List[ParsedLogEntry], max_lines: int = 100) -> str:
+    def format_entries_compact(self, entries: list[ParsedLogEntry], max_lines: int = 100) -> str:
         """Format entries compactly."""
         lines = []
         for entry in entries[:max_lines]:

loglens/parsers/__init__.py

@@ -1,10 +1,10 @@
 """Log parsers package."""
 
+from loglens.parsers.apache_parser import ApacheParser
 from loglens.parsers.base import LogParser, ParsedLogEntry
+from loglens.parsers.factory import ParserFactory
 from loglens.parsers.json_parser import JSONParser
 from loglens.parsers.syslog_parser import SyslogParser
-from loglens.parsers.apache_parser import ApacheParser
-from loglens.parsers.factory import ParserFactory
 
 __all__ = [
     "LogParser",

loglens/parsers/apache_parser.py

@@ -2,8 +2,8 @@
 
 import re
 from datetime import datetime
-from typing import Any, Dict, List, Match, Optional
-from urllib.parse import parse_qs, unquote
+from re import Match
+from typing import Any, Optional
 
 from loglens.parsers.base import LogParser, ParsedLogEntry
 
@@ -26,7 +26,7 @@ class ApacheParser(LogParser):
     )
 
     ERROR_PATTERN = re.compile(
-        r'^\[[A-Z][a-z]{2}\s+[A-Z][a-z]{2}\s+\d{1,2}\s+\d{2}:\d{2}:\d{2}(?:\.\d+)?\s+\d{4})\]\s+\[([^\]:]+):([^\]]+)\]\s+(?:\[pid\s+(\d+)\]\s+)?(?P<message>.*)$'
+        r"^\[([A-Z][a-z]{2}\s+[A-Z][a-z]{2}\s+\d{1,2}\s+\d{2}:\d{2}:\d{2}(?:\.\d+)?\s+\d{4})\]\s+\[([^\]:]+):([^\]]+)\]\s+(?:\[pid\s+(\d+)\]\s+)?(?P<message>.*)$"
     )
 
     STATUS_CODES = {
@@ -34,7 +34,7 @@ class ApacheParser(LogParser):
         "2xx": "success",
         "3xx": "redirection",
         "4xx": "client_error",
-        "5xx": "server_error"
+        "5xx": "server_error",
     }
 
     def __init__(self, custom_format: Optional[str] = None):
@@ -47,15 +47,17 @@ class ApacheParser(LogParser):
             self.custom_pattern = None
             return
 
-        pattern_str = format_str.replace("%h", r"(?P<ip>\S+)") \
-                               .replace("%l", r"\S+") \
-                               .replace("%u", r"\S+") \
-                               .replace("%t", r"\[(?P<timestamp>.*?)\]") \
-                               .replace("%r", r'"(?P<method>\S+)\s+(?P<path>.*?)\s+(?P<protocol>\S+)"') \
-                               .replace("%s", r"(?P<status>\d{3})") \
-                               .replace("%b", r"(?P<size>\S+)") \
-                               .replace("%{Referer}i", r'"(?P<referer>.*?)"') \
+        pattern_str = (
+            format_str.replace("%h", r"(?P<ip>\S+)")
+            .replace("%l", r"\S+")
+            .replace("%u", r"\S+")
+            .replace("%t", r"\[(?P<timestamp>.*?)\]")
+            .replace("%r", r'"(?P<method>\S+)\s+(?P<path>.*?)\s+(?P<protocol>\S+)"')
+            .replace("%s", r"(?P<status>\d{3})")
+            .replace("%b", r"(?P<size>\S+)")
+            .replace("%{Referer}i", r'"(?P<referer>.*?)"')
             .replace("%{User-agent}i", r'"(?P<user_agent>.*?)"')
+        )
 
         try:
             self.custom_pattern = re.compile("^" + pattern_str)
@@ -87,10 +89,7 @@ class ApacheParser(LogParser):
         if not line:
             return None
 
-        entry = ParsedLogEntry(
-            raw_line=line,
-            line_number=line_number
-        )
+        entry = ParsedLogEntry(raw_line=line, line_number=line_number)
 
         parsed = None
 
@@ -128,7 +127,7 @@ class ApacheParser(LogParser):
 
         return entry
 
-    def _extract_from_match(self, match: Match, line: str) -> Dict[str, Any]:
+    def _extract_from_match(self, match: Match, line: str) -> dict[str, Any]:
         """Extract data from regex match."""
         result = {}
 
@@ -143,7 +142,7 @@ class ApacheParser(LogParser):
 
         if "request" in groups:
             request = groups["request"]
-            request_match = re.match(r'(?P<method>\S+)\s+(?P<path>.*)', request)
+            request_match = re.match(r"(?P<method>\S+)\s+(?P<path>.*)", request)
             if request_match:
                 result["method"] = request_match.group("method")
                 result["path"] = request_match.group("path")
@@ -174,7 +173,7 @@ class ApacheParser(LogParser):
 
         return result
 
-    def _extract_error_from_match(self, match: Match, line: str) -> Dict[str, Any]:
+    def _extract_error_from_match(self, match: Match, line: str) -> dict[str, Any]:
         """Extract data from error log match."""
         groups = match.groupdict()
 

loglens/parsers/base.py

@@ -3,12 +3,13 @@
 from abc import ABC, abstractmethod
 from dataclasses import dataclass, field
 from datetime import datetime
-from typing import Any, Dict, List, Optional
 from enum import Enum
+from typing import Any, Optional
 
 
 class LogFormat(Enum):
     """Supported log formats."""
+
     JSON = "json"
     SYSLOG = "syslog"
     APACHE = "apache"
@@ -18,6 +19,7 @@ class LogFormat(Enum):
 @dataclass
 class ParsedLogEntry:
     """Represents a parsed log entry."""
+
     raw_line: str
     timestamp: Optional[datetime] = None
     level: Optional[str] = None
@@ -27,11 +29,11 @@ class ParsedLogEntry:
     facility: Optional[str] = None
     severity: Optional[str] = None
     logger: Optional[str] = None
-    extra: Dict[str, Any] = field(default_factory=dict)
+    extra: dict[str, Any] = field(default_factory=dict)
     line_number: int = 0
     error_pattern: Optional[str] = None
 
-    def to_dict(self) -> Dict[str, Any]:
+    def to_dict(self) -> dict[str, Any]:
         """Convert to dictionary."""
         result = {
             "raw_line": self.raw_line,
@@ -74,7 +76,7 @@ class LogParser(ABC):
         """Check if this parser can handle the given line."""
         pass
 
-    def parse_batch(self, lines: List[str]) -> List[ParsedLogEntry]:
+    def parse_batch(self, lines: list[str]) -> list[ParsedLogEntry]:
         """Parse multiple lines."""
         results = []
         for i, line in enumerate(lines, 1):
@@ -83,9 +85,5 @@ class LogParser(ABC):
                 if entry:
                     results.append(entry)
             except Exception:
-                results.append(ParsedLogEntry(
-                    raw_line=line,
-                    message="Parse error",
-                    line_number=i
-                ))
+                results.append(ParsedLogEntry(raw_line=line, message="Parse error", line_number=i))
         return results

loglens/parsers/factory.py

@@ -1,23 +1,23 @@
 """Parser factory for automatic format detection."""
 
-from typing import Dict, List, Optional, Type
+from typing import Optional
 
+from loglens.parsers.apache_parser import ApacheParser
 from loglens.parsers.base import LogFormat, LogParser, ParsedLogEntry
 from loglens.parsers.json_parser import JSONParser
 from loglens.parsers.syslog_parser import SyslogParser
-from loglens.parsers.apache_parser import ApacheParser
 
 
 class ParserFactory:
     """Factory for creating and selecting log parsers."""
 
     def __init__(self):
-        self.parsers: Dict[LogFormat, Type[LogParser]] = {
+        self.parsers: dict[LogFormat, type[LogParser]] = {
             LogFormat.JSON: JSONParser,
             LogFormat.SYSLOG: SyslogParser,
             LogFormat.APACHE: ApacheParser,
         }
-        self._parser_instances: Dict[LogFormat, LogParser] = {}
+        self._parser_instances: dict[LogFormat, LogParser] = {}
 
     def get_parser(self, format: LogFormat) -> LogParser:
         """Get parser instance for specified format."""
@@ -43,32 +43,38 @@ class ParserFactory:
 
         return LogFormat.UNKNOWN
 
-    def detect_format_batch(self, lines: List[str], sample_size: int = 10) -> LogFormat:
+    def detect_format_batch(self, lines: list[str], sample_size: int = 10) -> LogFormat:
         """Detect format from multiple lines."""
         sample = lines[:sample_size] if len(lines) > sample_size else lines
 
         if not sample:
             return LogFormat.UNKNOWN
 
-        format_counts: Dict[LogFormat, int] = {
+        format_counts: dict[LogFormat, int] = {
             LogFormat.JSON: 0,
             LogFormat.SYSLOG: 0,
             LogFormat.APACHE: 0,
-            LogFormat.UNKNOWN: 0
+            LogFormat.UNKNOWN: 0,
         }
 
         for line in sample:
             format_detected = self.detect_format(line)
             format_counts[format_detected] += 1
 
-        if format_counts[LogFormat.JSON] > format_counts[LogFormat.SYSLOG] and \
-           format_counts[LogFormat.JSON] > format_counts[LogFormat.APACHE]:
+        if (
+            format_counts[LogFormat.JSON] > format_counts[LogFormat.SYSLOG]
+            and format_counts[LogFormat.JSON] > format_counts[LogFormat.APACHE]
+        ):
             return LogFormat.JSON
-        elif format_counts[LogFormat.SYSLOG] > format_counts[LogFormat.JSON] and \
-              format_counts[LogFormat.SYSLOG] > format_counts[LogFormat.APACHE]:
+        elif (
+            format_counts[LogFormat.SYSLOG] > format_counts[LogFormat.JSON]
+            and format_counts[LogFormat.SYSLOG] > format_counts[LogFormat.APACHE]
+        ):
             return LogFormat.SYSLOG
-        elif format_counts[LogFormat.APACHE] > format_counts[LogFormat.JSON] and \
-              format_counts[LogFormat.APACHE] > format_counts[LogFormat.SYSLOG]:
+        elif (
+            format_counts[LogFormat.APACHE] > format_counts[LogFormat.JSON]
+            and format_counts[LogFormat.APACHE] > format_counts[LogFormat.SYSLOG]
+        ):
             return LogFormat.APACHE
 
         if format_counts[LogFormat.JSON] > 0:
@@ -80,21 +86,22 @@ class ParserFactory:
 
         return LogFormat.UNKNOWN
 
-    def parse_lines(self, lines: List[str], format: Optional[LogFormat] = None) -> List[ParsedLogEntry]:
+    def parse_lines(
+        self, lines: list[str], format: Optional[LogFormat] = None
+    ) -> list[ParsedLogEntry]:
         """Parse lines with automatic format detection."""
         if format is None:
             format = self.detect_format_batch(lines)
 
         if format == LogFormat.UNKNOWN:
-            return [ParsedLogEntry(
-                raw_line=line,
-                message="Unknown format",
-                line_number=i + 1
-            ) for i, line in enumerate(lines)]
+            return [
+                ParsedLogEntry(raw_line=line, message="Unknown format", line_number=i + 1)
+                for i, line in enumerate(lines)
+            ]
 
         parser = self.get_parser(format)
         return parser.parse_batch(lines)
 
-    def get_available_formats(self) -> List[LogFormat]:
+    def get_available_formats(self) -> list[LogFormat]:
         """Get list of available log formats."""
         return list(self.parsers.keys())

loglens/parsers/json_parser.py

@@ -1,8 +1,8 @@
 """JSON log parser."""
 
-import re
 from datetime import datetime
-from typing import Any, Dict, List, Optional
+from typing import Any, Optional
+
 import orjson
 
 from loglens.parsers.base import LogParser, ParsedLogEntry
@@ -15,8 +15,15 @@ class JSONParser(LogParser):
 
     def __init__(self):
         self.timestamp_fields = [
-            "@timestamp", "timestamp", "time", "date", "datetime",
-            "created_at", "updated_at", "log_time", "event_time"
+            "@timestamp",
+            "timestamp",
+            "time",
+            "date",
+            "datetime",
+            "created_at",
+            "updated_at",
+            "log_time",
+            "event_time",
         ]
         self.level_fields = ["level", "severity", "log_level", "priority", "levelname"]
         self.message_fields = ["message", "msg", "log", "text", "content"]
@@ -48,32 +55,32 @@ class JSONParser(LogParser):
                 raw_line=line,
                 message=f"JSON parse error: {str(e)}",
                 line_number=line_number,
-                severity="error"
+                severity="error",
             )
 
-        entry = ParsedLogEntry(
-            raw_line=line,
-            line_number=line_number
-        )
+        entry = ParsedLogEntry(raw_line=line, line_number=line_number)
 
         if isinstance(data, dict):
             entry.timestamp = self._extract_timestamp(data)
             entry.level = self._extract_field(data, self.level_fields)
             entry.message = self._extract_field(data, self.message_fields)
             entry.logger = self._extract_field(data, self.logger_fields)
-            entry.extra = {k: v for k, v in data.items()
+            entry.extra = {
+                k: v
+                for k, v in data.items()
                 if k not in self.timestamp_fields
                 and k not in self.level_fields
                 and k not in self.message_fields
                 and k not in self.logger_fields
-                          and not k.startswith("_")}
+                and not k.startswith("_")
+            }
         elif isinstance(data, list):
             entry.message = str(data)
             entry.extra = {"array_length": len(data)}
 
         return entry
 
-    def _extract_timestamp(self, data: Dict[str, Any]) -> Optional[datetime]:
+    def _extract_timestamp(self, data: dict[str, Any]) -> Optional[datetime]:
         """Extract timestamp from data dict."""
         for field in self.timestamp_fields:
             if field in data:
@@ -87,7 +94,7 @@ class JSONParser(LogParser):
                         pass
         return None
 
-    def _extract_field(self, data: Dict[str, Any], fields: List[str]) -> Optional[str]:
+    def _extract_field(self, data: dict[str, Any], fields: list[str]) -> Optional[str]:
         """Extract first matching field from data."""
         for field in fields:
             if field in data and data[field] is not None:
@@ -97,7 +104,7 @@ class JSONParser(LogParser):
                 return str(value)
         return None
 
-    def parse_batch(self, lines: List[str]) -> List[ParsedLogEntry]:
+    def parse_batch(self, lines: list[str]) -> list[ParsedLogEntry]:
         """Parse multiple lines, handling multi-line JSON."""
         results = []
         buffer = ""
@@ -123,12 +130,14 @@ class JSONParser(LogParser):
             except orjson.JSONDecodeError:
                 if line_stripped.startswith("{") or line_stripped.startswith("["):
                     if line_stripped.endswith("}") or line_stripped.endswith("]"):
-                        results.append(ParsedLogEntry(
+                        results.append(
+                            ParsedLogEntry(
                                 raw_line=line,
                                 message="Invalid JSON",
                                 line_number=line_number,
-                            severity="error"
-                        ))
+                                severity="error",
+                            )
+                        )
                         buffer = ""
                 elif buffer.endswith("}") or buffer.endswith("]"):
                     try:
@@ -136,41 +145,45 @@ class JSONParser(LogParser):
                         entry = self._create_entry_from_data(data, buffer, line_number)
                         results.append(entry)
                     except orjson.JSONDecodeError:
-                        results.append(ParsedLogEntry(
+                        results.append(
+                            ParsedLogEntry(
                                 raw_line=buffer,
                                 message="Invalid JSON",
                                 line_number=line_number,
-                            severity="error"
-                        ))
+                                severity="error",
+                            )
+                        )
                     buffer = ""
                 elif len(buffer) > 10000:
-                    results.append(ParsedLogEntry(
+                    results.append(
+                        ParsedLogEntry(
                             raw_line=buffer[:100] + "...",
                             message="JSON too large to parse",
                             line_number=line_number,
-                        severity="error"
-                    ))
+                            severity="error",
+                        )
+                    )
                     buffer = ""
 
         return results
 
     def _create_entry_from_data(self, data: Any, raw_line: str, line_number: int) -> ParsedLogEntry:
         """Create ParsedLogEntry from parsed JSON data."""
-        entry = ParsedLogEntry(
-            raw_line=raw_line,
-            line_number=line_number
-        )
+        entry = ParsedLogEntry(raw_line=raw_line, line_number=line_number)
 
         if isinstance(data, dict):
             entry.timestamp = self._extract_timestamp(data)
             entry.level = self._extract_field(data, self.level_fields)
             entry.message = self._extract_field(data, self.message_fields)
             entry.logger = self._extract_field(data, self.logger_fields)
-            entry.extra = {k: v for k, v in data.items()
+            entry.extra = {
+                k: v
+                for k, v in data.items()
                 if k not in self.timestamp_fields
                 and k not in self.level_fields
                 and k not in self.message_fields
-                          and k not in self.logger_fields}
+                and k not in self.logger_fields
+            }
         else:
             entry.message = str(data)
 

loglens/parsers/syslog_parser.py

@@ -2,7 +2,8 @@
 
 import re
 from datetime import datetime
-from typing import Any, Dict, List, Match, Optional
+from typing import Any, Optional
+
 from dateutil import parser as date_parser
 
 from loglens.parsers.base import LogParser, ParsedLogEntry
@@ -14,11 +15,11 @@ class SyslogParser(LogParser):
     format_name = "syslog"
 
     SYSLOG_RFC3164_PATTERN = re.compile(
-        r'^(?P<month>[A-Z][a-z]{2})\s+(?P<day>\d{1,2})\s+(?P<hour>\d{2}):(?P<minute>\d{2}):(?P<second>\d{2})\s+(?P<hostname>[\w.-]+)\s+(?P<process>[\w\[\]]+):\s*(?P<message>.*)$'
+        r"^(?P<month>[A-Z][a-z]{2})\s+(?P<day>\d{1,2})\s+(?P<hour>\d{2}):(?P<minute>\d{2}):(?P<second>\d{2})\s+(?P<hostname>[\w.-]+)\s+(?P<process>[\w\[\]]+):\s*(?P<message>.*)$"
     )
 
     SYSLOG_RFC5424_PATTERN = re.compile(
-        r'^(?P<pri><\d+>)?(?P<version>\d+)\s+(?P<timestamp>\S+)\s+(?P<hostname>\S+)\s+(?P<process>\S+)\s+(?P<pid>\S+)\s+(?P<msgid>\S+)?\s*(?P<struct_data>-)\s*(?P<message>.*)$'
+        r"^(?P<pri><\d+>)?(?P<version>\d+)\s+(?P<timestamp>\S+)\s+(?P<hostname>\S+)\s+(?P<process>\S+)\s+(?P<pid>\S+)\s+(?P<msgid>\S+)?\s*(?P<struct_data>-)\s*(?P<message>.*)$"
     )
 
     PRIORITY_MAP = {
@@ -29,7 +30,7 @@ class SyslogParser(LogParser):
         4: "warning",
         5: "notice",
         6: "info",
-        7: "debug"
+        7: "debug",
     }
 
     FACILITY_MAP = {
@@ -56,13 +57,23 @@ class SyslogParser(LogParser):
         20: "local4",
         21: "local5",
         22: "local6",
-        23: "local7"
+        23: "local7",
     }
 
     def __init__(self):
         self.month_map = {
-            "Jan": 1, "Feb": 2, "Mar": 3, "Apr": 4, "May": 5, "Jun": 6,
-            "Jul": 7, "Aug": 8, "Sep": 9, "Oct": 10, "Nov": 11, "Dec": 12
+            "Jan": 1,
+            "Feb": 2,
+            "Mar": 3,
+            "Apr": 4,
+            "May": 5,
+            "Jun": 6,
+            "Jul": 7,
+            "Aug": 8,
+            "Sep": 9,
+            "Oct": 10,
+            "Nov": 11,
+            "Dec": 12,
         }
 
     def can_parse(self, line: str) -> bool:
@@ -90,10 +101,7 @@ class SyslogParser(LogParser):
         if not line:
             return None
 
-        entry = ParsedLogEntry(
-            raw_line=line,
-            line_number=line_number
-        )
+        entry = ParsedLogEntry(raw_line=line, line_number=line_number)
 
         if line.startswith("<"):
             parsed = self._parse_rfc5424(line)
@@ -110,7 +118,7 @@ class SyslogParser(LogParser):
 
         return entry
 
-    def _parse_rfc3164(self, line: str) -> Optional[Dict[str, Any]]:
+    def _parse_rfc3164(self, line: str) -> Optional[dict[str, Any]]:
         """Parse RFC 3164 syslog format."""
         match = self.SYSLOG_RFC3164_PATTERN.match(line)
         if not match:
@@ -126,9 +134,7 @@ class SyslogParser(LogParser):
         message = match.group("message")
 
         current_year = datetime.now().year
-        timestamp = datetime(
-            current_year, self.month_map[month], day, hour, minute, second
-        )
+        timestamp = datetime(current_year, self.month_map[month], day, hour, minute, second)
 
         level = self._infer_level(message)
 
@@ -137,23 +143,23 @@ class SyslogParser(LogParser):
             "hostname": hostname,
             "process": process,
             "message": message,
-            "level": level
+            "level": level,
         }
 
-    def _parse_rfc5424(self, line: str) -> Optional[Dict[str, Any]]:
+    def _parse_rfc5424(self, line: str) -> Optional[dict[str, Any]]:
         """Parse RFC 5424 syslog format."""
         match = self.SYSLOG_RFC5424_PATTERN.match(line)
         if not match:
             return None
 
         raw_pri = match.group("pri")
-        version = match.group("version")
+        _ = match.group("version")
         timestamp_str = match.group("timestamp")
         hostname = match.group("hostname")
         process = match.group("process")
         pid = match.group("pid")
-        msgid = match.group("msgid")
-        struct_data = match.group("struct_data")
+        _ = match.group("msgid")
+        _ = match.group("struct_data")
         message = match.group("message")
 
         try:
@@ -163,7 +169,6 @@ class SyslogParser(LogParser):
 
         priority = None
         facility = None
-        level = None
         if raw_pri:
             pri_num = int(raw_pri[1:-1])
             priority = pri_num & 0x07
@@ -180,7 +185,7 @@ class SyslogParser(LogParser):
             "process": f"{process}[{pid}]" if pid else process,
             "message": message,
             "level": level,
-            "facility": facility
+            "facility": facility,
         }
 
     def _infer_level(self, message: str) -> Optional[str]:

tests/conftest.py

@@ -45,14 +45,14 @@ def sample_apache_logs():
 def error_logs():
     """Sample error log lines."""
     return [
-        'Jan 15 10:30:00 server-01 app[1234]: Traceback (most recent call last):',
+        "Jan 15 10:30:00 server-01 app[1234]: Traceback (most recent call last):",
         'Jan 15 10:30:01 server-01 app[1234]:   File "main.py", line 42, in <module>',
-        'Jan 15 10:30:02 server-01 app[1234]:     result = process_data(data)',
+        "Jan 15 10:30:02 server-01 app[1234]:     result = process_data(data)",
         'Jan 15 10:30:03 server-01 app[1234]:   File "main.py", line 100, in process_data',
-        'Jan 15 10:30:04 server-01 app[1234]: KeyError: "Missing required key \'id\'"',
+        "Jan 15 10:30:04 server-01 app[1234]: KeyError: \"Missing required key 'id'\"",
         '{"level": "ERROR", "message": "NullPointerException: Cannot call method on null object"}',
         '{"level": "ERROR", "message": "HTTP Error 500: Internal Server Error"}',
-        'Jan 15 10:30:05 server-01 kernel: [1234.567] Out of memory: Kill process 1234 (app)',
+        "Jan 15 10:30:05 server-01 kernel: [1234.567] Out of memory: Kill process 1234 (app)",
     ]
 
 
@@ -60,4 +60,5 @@ def error_logs():
 def analyzer():
     """Log analyzer instance."""
     from loglens.analyzers.analyzer import LogAnalyzer
+
     return LogAnalyzer()

tests/integration/test_end_to_end.py

@@ -1,13 +1,8 @@
 """Integration tests for LogLens."""
 
-import pytest
-import tempfile
-from pathlib import Path
-
-from loglens.parsers.base import LogFormat
 from loglens.analyzers.analyzer import LogAnalyzer
-from loglens.formatters.table_formatter import TableFormatter
 from loglens.formatters.json_formatter import JSONFormatter
+from loglens.parsers.base import LogFormat
 
 
 class TestEndToEnd:
@@ -48,10 +43,10 @@ Jan 15 10:30:02 server-01 app[1234]: WARNING: High memory usage
 
     def test_apache_file_analysis(self, tmp_path):
         """Test complete Apache file analysis."""
-        log_content = '''192.168.1.1 - - [15/Jan/2024:10:30:00 +0000] "GET /api/users HTTP/1.1" 200 1234
+        log_content = """192.168.1.1 - - [15/Jan/2024:10:30:00 +0000] "GET /api/users HTTP/1.1" 200 1234
 192.168.1.2 - - [15/Jan/2024:10:30:01 +0000] "POST /api/login HTTP/1.1" 401 567
 192.168.1.3 - - [15/Jan/2024:10:30:02 +0000] "GET /api/orders HTTP/1.1" 500 4321
-'''
+"""
         log_file = tmp_path / "apache.log"
         log_file.write_text(log_content)
 

tests/unit/test_analyzer.py

@@ -1,8 +1,6 @@
 """Unit tests for log analyzer."""
 
-import pytest
-from loglens.analyzers.analyzer import LogAnalyzer, AnalysisResult
-from loglens.analyzers.patterns import PatternLibrary, ErrorPattern
+from loglens.analyzers.patterns import ErrorPattern, PatternLibrary
 from loglens.analyzers.severity import SeverityClassifier, SeverityLevel
 from loglens.parsers.base import LogFormat
 
@@ -63,9 +61,7 @@ class TestPatternLibrary:
         """Test adding custom pattern."""
         library = PatternLibrary()
         custom = ErrorPattern(
-            name="Custom Error",
-            pattern="UNIQUE_CUSTOM_PATTERN_12345",
-            severity="error"
+            name="Custom Error", pattern="UNIQUE_CUSTOM_PATTERN_12345", severity="error"
         )
         library.add_pattern(custom)
 

tests/unit/test_cli.py

@@ -1,12 +1,11 @@
 """Unit tests for CLI commands."""
 
+from unittest.mock import MagicMock, patch
+
 import pytest
 from click.testing import CliRunner
-from unittest.mock import patch, MagicMock
-import sys
-from io import StringIO
 
-from loglens.cli.commands import analyze, watch, report, patterns, info
+from loglens.cli.commands import analyze, info, patterns, report, watch
 
 
 @pytest.fixture
@@ -18,7 +17,7 @@ def runner():
 class TestAnalyzeCommand:
     """Tests for analyze command."""
 
-    @patch('loglens.cli.commands.LogAnalyzer')
+    @patch("loglens.cli.commands.LogAnalyzer")
     def test_analyze_file(self, mock_analyzer_class, runner, tmp_path):
         """Test analyzing a log file."""
         mock_analyzer = MagicMock()
@@ -43,7 +42,7 @@ class TestAnalyzeCommand:
 
         assert result.exit_code == 0
 
-    @patch('loglens.cli.commands.LogAnalyzer')
+    @patch("loglens.cli.commands.LogAnalyzer")
     def test_analyze_json_output(self, mock_analyzer_class, runner, tmp_path):
         """Test analyze with JSON output."""
         mock_analyzer = MagicMock()
@@ -90,7 +89,7 @@ class TestWatchCommand:
 class TestReportCommand:
     """Tests for report command."""
 
-    @patch('loglens.cli.commands.LogAnalyzer')
+    @patch("loglens.cli.commands.LogAnalyzer")
     def test_report_to_file(self, mock_analyzer_class, runner, tmp_path):
         """Test report generation to file."""
         mock_analyzer = MagicMock()
@@ -118,7 +117,7 @@ class TestReportCommand:
 class TestPatternsCommand:
     """Tests for patterns command."""
 
-    @patch('loglens.cli.commands.LogAnalyzer')
+    @patch("loglens.cli.commands.LogAnalyzer")
     def test_list_patterns(self, mock_analyzer_class, runner):
         """Test listing patterns."""
         mock_analyzer = MagicMock()

tests/unit/test_parsers.py

@@ -1,11 +1,10 @@
 """Unit tests for log parsers."""
 
-import pytest
-from loglens.parsers.base import LogFormat, ParsedLogEntry
+from loglens.parsers.apache_parser import ApacheParser
+from loglens.parsers.base import LogFormat
+from loglens.parsers.factory import ParserFactory
 from loglens.parsers.json_parser import JSONParser
 from loglens.parsers.syslog_parser import SyslogParser
-from loglens.parsers.apache_parser import ApacheParser
-from loglens.parsers.factory import ParserFactory
 
 
 class TestJSONParser:
@@ -29,7 +28,7 @@ class TestJSONParser:
         parser = JSONParser()
 
         assert parser.can_parse('{"key": "value"}')
-        assert parser.can_parse('[1, 2, 3]')
+        assert parser.can_parse("[1, 2, 3]")
         assert not parser.can_parse("not json")
         assert not parser.can_parse("")
 
@@ -120,7 +119,7 @@ class TestApacheParser:
     def test_error_log(self):
         """Test parsing Apache error log."""
         parser = ApacheParser()
-        line = '[Sat Jan 15 10:30:00.123456 2024] [mpm_prefork:notice] [pid 1234] AH00163: Apache configured'
+        line = "[Sat Jan 15 10:30:00.123456 2024] [mpm_prefork:notice] [pid 1234] AH00163: Apache configured"
 
         entry = parser.parse(line, 1)