Add singleton logging configuration for the renamer application

This commit introduces a new module `logging_config.py` that implements a singleton pattern for logging configuration. The logger is initialized only once and can be configured based on an environment variable to log to a file or to the console. This centralizes logging setup and ensures consistent logging behavior throughout the application.

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "renamer"
-version = "0.8.8"
+version = "0.8.9"
 description = "Terminal-based media file renamer and metadata viewer"
 readme = "README.md"
 requires-python = ">=3.11"

renamer/app.py

@@ -9,8 +9,8 @@ from functools import partial
 import threading
 import time
 import logging
-import os
 
+from .logging_config import LoggerConfig  # Initialize logging singleton
 from .constants import MEDIA_TYPES
 from .screens import OpenScreen, HelpScreen, RenameConfirmScreen, SettingsScreen, ConvertConfirmScreen
 from .extractors.extractor import MediaExtractor
@@ -22,14 +22,6 @@ from .cache import Cache, CacheManager
 from .services.conversion_service import ConversionService
 
 
-# Set up logging conditionally
-if os.getenv('FORMATTER_LOG', '0') == '1':
-    logging.basicConfig(filename='formatter.log', level=logging.INFO,
-                        format='%(asctime)s - %(levelname)s - %(message)s')
-else:
-    logging.basicConfig(level=logging.INFO)  # Enable logging for debugging
-
-
 class CacheCommandProvider(Provider):
     """Command provider for cache management operations."""
 
@@ -431,6 +423,11 @@ class RenamerApp(App):
 
             try:
                 if node.data.is_file():
+                    # Invalidate cache for this file before re-extracting
+                    cache = Cache()
+                    invalidated = cache.invalidate_file(node.data)
+                    logging.info(f"Refresh: invalidated {invalidated} cache entries for {node.data.name}")
+
                     self._start_loading_animation()
                     threading.Thread(
                         target=self._extract_and_show_details, args=(node.data,)

renamer/cache/core.py

@@ -12,14 +12,30 @@ logger = logging.getLogger(__name__)
 
 
 class Cache:
-    """Thread-safe file-based cache with TTL support."""
+    """Thread-safe file-based cache with TTL support (Singleton)."""
+
+    _instance: Optional['Cache'] = None
+    _lock_init = threading.Lock()
+
+    def __new__(cls, cache_dir: Optional[Path] = None):
+        """Create or return singleton instance."""
+        if cls._instance is None:
+            with cls._lock_init:
+                if cls._instance is None:
+                    cls._instance = super().__new__(cls)
+                    cls._instance._initialized = False
+        return cls._instance
 
     def __init__(self, cache_dir: Optional[Path] = None):
-        """Initialize cache with optional custom directory.
+        """Initialize cache with optional custom directory (only once).
 
         Args:
             cache_dir: Optional cache directory path. Defaults to ~/.cache/renamer/
         """
+        # Only initialize once
+        if self._initialized:
+            return
+
         # Always use the default cache dir to avoid creating cache in scan dir
         if cache_dir is None:
             cache_dir = Path.home() / ".cache" / "renamer"
@@ -27,6 +43,7 @@ class Cache:
         self.cache_dir.mkdir(parents=True, exist_ok=True)
         self._memory_cache: Dict[str, Dict[str, Any]] = {}  # In-memory cache for faster access
         self._lock = threading.RLock()  # Reentrant lock for thread safety
+        self._initialized = True
 
     def _sanitize_key_component(self, component: str) -> str:
         """Sanitize a key component to prevent filesystem escaping.
@@ -85,14 +102,15 @@ class Cache:
         # Use .json extension for all cache files (simplifies logic)
         return cache_subdir / f"{key_hash}.json"
 
-    def get(self, key: str) -> Optional[Any]:
+    def get(self, key: str, default: Any = None) -> Any:
         """Get cached value if not expired (thread-safe).
 
         Args:
             key: Cache key
+            default: Value to return if key not found or expired
 
         Returns:
-            Cached value or None if not found/expired
+            Cached value or default if not found/expired
         """
         with self._lock:
             # Check memory cache first
@@ -108,7 +126,7 @@ class Cache:
             # Check file cache
             cache_file = self._get_cache_file(key)
             if not cache_file.exists():
-                return None
+                return default
 
             try:
                 with open(cache_file, 'r') as f:
@@ -118,7 +136,7 @@ class Cache:
                     # Expired, remove file
                     cache_file.unlink(missing_ok=True)
                     logger.debug(f"File cache expired for key: {key}, removed {cache_file}")
-                    return None
+                    return default
 
                 # Store in memory cache for faster future access
                 self._memory_cache[key] = data
@@ -128,11 +146,11 @@ class Cache:
                 # Corrupted JSON, remove file
                 logger.warning(f"Corrupted cache file {cache_file}: {e}")
                 cache_file.unlink(missing_ok=True)
-                return None
+                return default
             except IOError as e:
                 # File read error
                 logger.error(f"Failed to read cache file {cache_file}: {e}")
-                return None
+                return default
 
     def set(self, key: str, value: Any, ttl_seconds: int) -> None:
         """Set cached value with TTL (thread-safe).
@@ -177,6 +195,56 @@ class Cache:
                 cache_file.unlink(missing_ok=True)
                 logger.debug(f"Invalidated cache for key: {key}")
 
+    def invalidate_file(self, file_path: Path) -> int:
+        """Invalidate all cache entries for a specific file path.
+
+        This invalidates all extractor method caches for the given file by:
+        1. Clearing matching keys from memory cache
+        2. Removing matching keys from file cache
+
+        Args:
+            file_path: File path to invalidate cache for
+
+        Returns:
+            Number of cache entries invalidated
+        """
+        with self._lock:
+            # Generate the path hash used in cache keys
+            path_hash = hashlib.md5(str(file_path).encode()).hexdigest()[:12]
+            prefix = f"extractor_{path_hash}_"
+
+            invalidated_count = 0
+
+            # Remove from memory cache (easy - just check prefix)
+            keys_to_remove = [k for k in self._memory_cache.keys() if k.startswith(prefix)]
+            for key in keys_to_remove:
+                del self._memory_cache[key]
+                invalidated_count += 1
+                logger.debug(f"Invalidated memory cache for key: {key}")
+
+            # For file cache, we need to invalidate all known extractor methods
+            # List of all cached extractor methods
+            extractor_methods = [
+                'extract_title', 'extract_year', 'extract_source', 'extract_video_codec',
+                'extract_audio_codec', 'extract_frame_class', 'extract_hdr', 'extract_order',
+                'extract_special_info', 'extract_movie_db', 'extract_extension',
+                'extract_video_tracks', 'extract_audio_tracks', 'extract_subtitle_tracks',
+                'extract_interlaced', 'extract_size', 'extract_duration', 'extract_bitrate',
+                'extract_created', 'extract_modified'
+            ]
+
+            # Invalidate each possible cache key
+            for method in extractor_methods:
+                cache_key = f"extractor_{path_hash}_{method}"
+                cache_file = self._get_cache_file(cache_key)
+                if cache_file.exists():
+                    cache_file.unlink(missing_ok=True)
+                    invalidated_count += 1
+                    logger.debug(f"Invalidated file cache for key: {cache_key}")
+
+            logger.info(f"Invalidated {invalidated_count} cache entries for file: {file_path.name}")
+            return invalidated_count
+
     def get_image(self, key: str) -> Optional[Path]:
         """Get cached image path if not expired (thread-safe).
 

renamer/cache/decorators.py

@@ -19,6 +19,9 @@ from .strategies import (
 
 logger = logging.getLogger(__name__)
 
+# Sentinel object to distinguish "not in cache" from "cached value is None"
+_CACHE_MISS = object()
+
 
 def cached(
     strategy: Optional[CacheKeyStrategy] = None,
@@ -78,10 +81,10 @@ def cached(
                 logger.warning(f"Failed to generate cache key: {e}, executing uncached")
                 return func(self, *args, **kwargs)
 
-            # Check cache
+            # Check cache (use sentinel to distinguish "not in cache" from "cached None")
-            cached_value = cache.get(cache_key)
+            cached_value = cache.get(cache_key, _CACHE_MISS)
-            if cached_value is not None:
+            if cached_value is not _CACHE_MISS:
-                logger.debug(f"Cache hit for {func.__name__}: {cache_key}")
+                logger.debug(f"Cache hit for {func.__name__}: {cache_key} (value={cached_value!r})")
                 return cached_value
 
             # Execute function
@@ -91,10 +94,9 @@ def cached(
             # Determine TTL
             actual_ttl = _determine_ttl(self, ttl)
 
-            # Cache result (only if not None)
+            # Cache result (including None - None is valid data meaning "not found")
-            if result is not None:
+            cache.set(cache_key, result, actual_ttl)
-                cache.set(cache_key, result, actual_ttl)
+            logger.debug(f"Cached {func.__name__}: {cache_key} (TTL: {actual_ttl}s, value={result!r})")
-                logger.debug(f"Cached {func.__name__}: {cache_key} (TTL: {actual_ttl}s)")
 
             return result
 
@@ -129,8 +131,9 @@ def _generate_cache_key(
         if not file_path:
             raise ValueError(f"{instance.__class__.__name__} missing file_path attribute")
 
-        instance_id = str(id(instance))
+        # Cache by file_path + method_name only (no instance_id)
-        return strategy.generate_key(file_path, func.__name__, instance_id)
+        # This allows cache hits across different extractor instances for the same file
+        return strategy.generate_key(file_path, func.__name__)
 
     elif isinstance(strategy, APIRequestStrategy):
         # API pattern: expects service name in args or uses function name
@@ -246,10 +249,10 @@ def cached_api(service: str, ttl: Optional[int] = None):
             strategy = APIRequestStrategy()
             cache_key = strategy.generate_key(service, func.__name__, {'params': args_repr})
 
-            # Check cache
+            # Check cache (use sentinel to distinguish "not in cache" from "cached None")
-            cached_value = cache.get(cache_key)
+            cached_value = cache.get(cache_key, _CACHE_MISS)
-            if cached_value is not None:
+            if cached_value is not _CACHE_MISS:
-                logger.debug(f"API cache hit for {service}.{func.__name__}")
+                logger.debug(f"API cache hit for {service}.{func.__name__} (value={cached_value!r})")
                 return cached_value
 
             # Execute function
@@ -267,10 +270,9 @@ def cached_api(service: str, ttl: Optional[int] = None):
                 else:
                     actual_ttl = 21600  # Default 6 hours
 
-            # Cache result (only if not None)
+            # Cache result (including None - None is valid data)
-            if result is not None:
+            cache.set(cache_key, result, actual_ttl)
-                cache.set(cache_key, result, actual_ttl)
+            logger.debug(f"API cached {service}.{func.__name__} (TTL: {actual_ttl}s, value={result!r})")
-                logger.debug(f"API cached {service}.{func.__name__} (TTL: {actual_ttl}s)")
 
             return result
 

renamer/constants/__init__.py

@@ -12,7 +12,7 @@ This package contains constants split into logical modules:
 """
 
 # Import from all constant modules
-from .media_constants import MEDIA_TYPES
+from .media_constants import MEDIA_TYPES, META_TYPE_TO_EXTENSIONS
 from .source_constants import SOURCE_DICT
 from .frame_constants import FRAME_CLASSES, NON_STANDARD_QUALITY_INDICATORS
 from .moviedb_constants import MOVIE_DB_DICT
@@ -24,6 +24,7 @@ from .cyrillic_constants import CYRILLIC_TO_ENGLISH
 __all__ = [
     # Media types
     'MEDIA_TYPES',
+    'META_TYPE_TO_EXTENSIONS',
     # Source types
     'SOURCE_DICT',
     # Frame classes

renamer/constants/media_constants.py

@@ -54,3 +54,13 @@ MEDIA_TYPES = {
         "mime": "video/mpeg",
     },
 }
+
+# Reverse mapping: meta_type -> list of extensions
+# Built once at module load instead of rebuilding in every extractor instance
+META_TYPE_TO_EXTENSIONS = {}
+for ext, info in MEDIA_TYPES.items():
+    meta_type = info.get('meta_type')
+    if meta_type:
+        if meta_type not in META_TYPE_TO_EXTENSIONS:
+            META_TYPE_TO_EXTENSIONS[meta_type] = []
+        META_TYPE_TO_EXTENSIONS[meta_type].append(ext)

renamer/extractors/extractor.py

@@ -45,14 +45,15 @@ class MediaExtractor:
         >>> tracks = extractor.get("video_tracks")
     """
 
-    def __init__(self, file_path: Path):
+    def __init__(self, file_path: Path, use_cache: bool = True):
         self.file_path = file_path
-        
+
-        self.filename_extractor = FilenameExtractor(file_path)
+        # Initialize all extractors - they use singleton Cache internally
-        self.metadata_extractor = MetadataExtractor(file_path)
+        self.filename_extractor = FilenameExtractor(file_path, use_cache)
-        self.mediainfo_extractor = MediaInfoExtractor(file_path)
+        self.metadata_extractor = MetadataExtractor(file_path, use_cache)
-        self.fileinfo_extractor = FileInfoExtractor(file_path)
+        self.mediainfo_extractor = MediaInfoExtractor(file_path, use_cache)
-        self.tmdb_extractor = TMDBExtractor(file_path)
+        self.fileinfo_extractor = FileInfoExtractor(file_path, use_cache)
+        self.tmdb_extractor = TMDBExtractor(file_path, use_cache)
         self.default_extractor = DefaultExtractor()
         
         # Extractor mapping

renamer/extractors/fileinfo_extractor.py

@@ -6,15 +6,8 @@ file system metadata such as size, timestamps, paths, and extensions.
 
 from pathlib import Path
 import logging
-import os
+from ..cache import cached_method, Cache
-from ..cache import cached_method
+from ..logging_config import LoggerConfig  # Initialize logging singleton
-
-# Set up logging conditionally
-if os.getenv('FORMATTER_LOG', '0') == '1':
-    logging.basicConfig(filename='formatter.log', level=logging.INFO,
-                        format='%(asctime)s - %(levelname)s - %(message)s')
-else:
-    logging.basicConfig(level=logging.CRITICAL)  # Disable logging
 
 
 class FileInfoExtractor:
@@ -39,13 +32,17 @@ class FileInfoExtractor:
         >>> name = extractor.extract_file_name()  # Returns "movie.mkv"
     """
 
-    def __init__(self, file_path: Path):
+    def __init__(self, file_path: Path, use_cache: bool = True):
         """Initialize the FileInfoExtractor.
 
         Args:
             file_path: Path object pointing to the file to extract info from
+            use_cache: Whether to use caching (default: True)
         """
         self._file_path = file_path
+        self.file_path = file_path  # Expose for cache key generation
+        self.cache = Cache() if use_cache else None  # Singleton cache for @cached_method decorator
+        self.settings = None  # Will be set by Settings singleton if needed
         self._stat = file_path.stat()
         self._cache: dict[str, any] = {}  # Internal cache for method results
 

renamer/extractors/filename_extractor.py

@@ -8,7 +8,7 @@ from ..constants import (
     is_valid_year,
     CYRILLIC_TO_ENGLISH
 )
-from ..cache import cached_method
+from ..cache import cached_method, Cache
 from ..utils.pattern_utils import PatternExtractor
 import langcodes
 
@@ -18,7 +18,7 @@ logger = logging.getLogger(__name__)
 class FilenameExtractor:
     """Class to extract information from filename"""
 
-    def __init__(self, file_path: Path | str):
+    def __init__(self, file_path: Path | str, use_cache: bool = True):
         if isinstance(file_path, str):
             self.file_path = Path(file_path)
             self.file_name = file_path
@@ -26,6 +26,9 @@ class FilenameExtractor:
             self.file_path = file_path
             self.file_name = file_path.name
 
+        self.cache = Cache() if use_cache else None  # Singleton cache for @cached_method decorator
+        self.settings = None  # Will be set by Settings singleton if needed
+
         # Initialize utility helper
         self._pattern_extractor = PatternExtractor()
 

renamer/extractors/mediainfo_extractor.py

@@ -1,8 +1,8 @@
 from pathlib import Path
 from pymediainfo import MediaInfo
 from collections import Counter
-from ..constants import FRAME_CLASSES, MEDIA_TYPES
+from ..constants import FRAME_CLASSES, META_TYPE_TO_EXTENSIONS
-from ..cache import cached_method
+from ..cache import cached_method, Cache
 import langcodes
 import logging
 
@@ -12,40 +12,35 @@ logger = logging.getLogger(__name__)
 class MediaInfoExtractor:
     """Class to extract information from MediaInfo"""
 
-    def __init__(self, file_path: Path):
+    def __init__(self, file_path: Path, use_cache: bool = True):
         self.file_path = file_path
+        self.cache = Cache() if use_cache else None  # Singleton cache for @cached_method decorator
+        self.settings = None  # Will be set by Settings singleton if needed
         self._cache = {}  # Internal cache for method results
-        try:
+
-            self.media_info = MediaInfo.parse(file_path)
+        # Parse media info - set to None on failure
+        self.media_info = MediaInfo.parse(file_path) if file_path.exists() else None
+
+        # Extract tracks
+        if self.media_info:
             self.video_tracks = [t for t in self.media_info.tracks if t.track_type == 'Video']
             self.audio_tracks = [t for t in self.media_info.tracks if t.track_type == 'Audio']
             self.sub_tracks = [t for t in self.media_info.tracks if t.track_type == 'Text']
-        except Exception as e:
+        else:
-            logger.warning(f"Failed to parse media info for {file_path}: {e}")
-            self.media_info = None
             self.video_tracks = []
             self.audio_tracks = []
             self.sub_tracks = []
 
-        # Build mapping from meta_type to extensions
-        self._format_to_extensions = {}
-        for ext, info in MEDIA_TYPES.items():
-            meta_type = info.get('meta_type')
-            if meta_type:
-                if meta_type not in self._format_to_extensions:
-                    self._format_to_extensions[meta_type] = []
-                self._format_to_extensions[meta_type].append(ext)
-
     def _get_frame_class_from_height(self, height: int) -> str | None:
         """Get frame class from video height, finding closest match if exact not found"""
         if not height:
             return None
-        
+
         # First try exact match
         for frame_class, info in FRAME_CLASSES.items():
             if height == info['nominal_height']:
                 return frame_class
-        
+
         # If no exact match, find closest
         closest = None
         min_diff = float('inf')
@@ -54,7 +49,7 @@ class MediaInfoExtractor:
             if diff < min_diff:
                 min_diff = diff
                 closest = frame_class
-        
+
         # Only return if difference is reasonable (within 50 pixels)
         if min_diff <= 50:
             return closest
@@ -77,30 +72,37 @@ class MediaInfoExtractor:
         width = getattr(self.video_tracks[0], 'width', None)
         if not height or not width:
             return None
-        
+
         # Check if interlaced - try multiple attributes
         # PyMediaInfo may use different attribute names depending on version
         scan_type_attr = getattr(self.video_tracks[0], 'scan_type', None)
         interlaced = getattr(self.video_tracks[0], 'interlaced', None)
 
+        logger.debug(f"[{self.file_path.name}] Frame class detection - Resolution: {width}x{height}")
+        logger.debug(f"[{self.file_path.name}]   scan_type attribute: {scan_type_attr!r} (type: {type(scan_type_attr).__name__})")
+        logger.debug(f"[{self.file_path.name}]   interlaced attribute: {interlaced!r} (type: {type(interlaced).__name__})")
+
         # Determine scan type from available attributes
         # Check scan_type first (e.g., "Interlaced", "Progressive", "MBAFF")
         if scan_type_attr and isinstance(scan_type_attr, str):
             scan_type = 'i' if 'interlaced' in scan_type_attr.lower() else 'p'
+            logger.debug(f"[{self.file_path.name}]   Using scan_type: {scan_type_attr!r} -> scan_type={scan_type!r}")
         # Then check interlaced flag (e.g., "Yes", "No")
         elif interlaced and isinstance(interlaced, str):
             scan_type = 'i' if interlaced.lower() in ['yes', 'true', '1'] else 'p'
+            logger.debug(f"[{self.file_path.name}]   Using interlaced: {interlaced!r} -> scan_type={scan_type!r}")
         else:
             # Default to progressive if no information available
             scan_type = 'p'
-        
+            logger.debug(f"[{self.file_path.name}]   No scan type info, defaulting to progressive")
+
         # Calculate effective height for frame class determination
         aspect_ratio = 16 / 9
         if height > width:
             effective_height = height / aspect_ratio
         else:
             effective_height = height
-        
+
         # First, try to match width to typical widths
         # Use a larger tolerance (10 pixels) to handle cinema/ultrawide aspect ratios
         width_matches = []
@@ -109,18 +111,21 @@ class MediaInfoExtractor:
                 if abs(width - tw) <= 10 and frame_class.endswith(scan_type):
                     diff = abs(height - info['nominal_height'])
                     width_matches.append((frame_class, diff))
-        
+
         if width_matches:
             # Choose the frame class with the smallest height difference
             width_matches.sort(key=lambda x: x[1])
-            return width_matches[0][0]
+            result = width_matches[0][0]
-        
+            logger.debug(f"[{self.file_path.name}]   Result (width match): {result!r}")
+            return result
+
         # If no width match, fall back to height-based matching
         # First try exact match with standard frame classes
         frame_class = f"{int(round(effective_height))}{scan_type}"
         if frame_class in FRAME_CLASSES:
+            logger.debug(f"[{self.file_path.name}]   Result (exact height match): {frame_class!r}")
             return frame_class
-        
+
         # Find closest standard height match
         closest_class = None
         min_diff = float('inf')
@@ -130,12 +135,14 @@ class MediaInfoExtractor:
                 if diff < min_diff:
                     min_diff = diff
                     closest_class = fc
-        
+
         # Return closest standard match if within reasonable distance (20 pixels)
         if closest_class and min_diff <= 20:
+            logger.debug(f"[{self.file_path.name}]   Result (closest match, diff={min_diff}): {closest_class!r}")
             return closest_class
-        
+
         # For non-standard resolutions, create a custom frame class
+        logger.debug(f"[{self.file_path.name}]   Result (custom/non-standard): {frame_class!r}")
         return frame_class
 
     @cached_method()
@@ -148,7 +155,7 @@ class MediaInfoExtractor:
         if width and height:
             return width, height
         return None
-    
+
     @cached_method()
     def extract_aspect_ratio(self) -> str | None:
         """Extract video aspect ratio from media info"""
@@ -186,7 +193,7 @@ class MediaInfoExtractor:
                 # If conversion fails, use the original code
                 logger.debug(f"Invalid language code '{lang_code}': {e}")
                 langs.append(lang_code.lower()[:3])
-        
+
         lang_counts = Counter(langs)
         audio_langs = [f"{count}{lang}" if count > 1 else lang for lang, count in lang_counts.items()]
         return ','.join(audio_langs)
@@ -265,8 +272,8 @@ class MediaInfoExtractor:
         if not general_track:
             return None
         format_ = getattr(general_track, 'format', None)
-        if format_ in self._format_to_extensions:
+        if format_ in META_TYPE_TO_EXTENSIONS:
-            exts = self._format_to_extensions[format_]
+            exts = META_TYPE_TO_EXTENSIONS[format_]
             if format_ == 'Matroska':
                 if self.is_3d() and 'mk3d' in exts:
                     return 'mk3d'
@@ -282,4 +289,50 @@ class MediaInfoExtractor:
         if not self.is_3d():
             return None
         stereoscopic = getattr(self.video_tracks[0], 'stereoscopic', None)
-        return stereoscopic if stereoscopic else None
+        return stereoscopic if stereoscopic else None
+
+    @cached_method()
+    def extract_interlaced(self) -> bool | None:
+        """Determine if the video is interlaced.
+
+        Returns:
+            True: Video is interlaced
+            False: Video is progressive (explicitly set)
+            None: Information not available in MediaInfo
+        """
+        if not self.video_tracks:
+            logger.debug(f"[{self.file_path.name}] Interlaced detection: No video tracks")
+            return None
+
+        scan_type_attr = getattr(self.video_tracks[0], 'scan_type', None)
+        interlaced = getattr(self.video_tracks[0], 'interlaced', None)
+
+        logger.debug(f"[{self.file_path.name}] Interlaced detection:")
+        logger.debug(f"[{self.file_path.name}]   scan_type: {scan_type_attr!r} (type: {type(scan_type_attr).__name__})")
+        logger.debug(f"[{self.file_path.name}]   interlaced: {interlaced!r} (type: {type(interlaced).__name__})")
+
+        # Check scan_type attribute first (e.g., "Interlaced", "Progressive", "MBAFF")
+        if scan_type_attr and isinstance(scan_type_attr, str):
+            scan_lower = scan_type_attr.lower()
+            if 'interlaced' in scan_lower or 'mbaff' in scan_lower:
+                logger.debug(f"[{self.file_path.name}]   Result: True (from scan_type={scan_type_attr!r})")
+                return True
+            elif 'progressive' in scan_lower:
+                logger.debug(f"[{self.file_path.name}]   Result: False (from scan_type={scan_type_attr!r})")
+                return False
+            # If scan_type has some other value, fall through to check interlaced
+            logger.debug(f"[{self.file_path.name}]   scan_type unrecognized, checking interlaced attribute")
+
+        # Check interlaced attribute (e.g., "Yes", "No")
+        if interlaced and isinstance(interlaced, str):
+            interlaced_lower = interlaced.lower()
+            if interlaced_lower in ['yes', 'true', '1']:
+                logger.debug(f"[{self.file_path.name}]   Result: True (from interlaced={interlaced!r})")
+                return True
+            elif interlaced_lower in ['no', 'false', '0']:
+                logger.debug(f"[{self.file_path.name}]   Result: False (from interlaced={interlaced!r})")
+                return False
+
+        # No information available
+        logger.debug(f"[{self.file_path.name}]   Result: None (no information available)")
+        return None

renamer/extractors/metadata_extractor.py

@@ -8,7 +8,7 @@ import mutagen
 import logging
 from pathlib import Path
 from ..constants import MEDIA_TYPES
-from ..cache import cached_method
+from ..cache import cached_method, Cache
 
 logger = logging.getLogger(__name__)
 
@@ -32,13 +32,16 @@ class MetadataExtractor:
         >>> duration = extractor.extract_duration()
     """
 
-    def __init__(self, file_path: Path):
+    def __init__(self, file_path: Path, use_cache: bool = True):
         """Initialize the MetadataExtractor.
 
         Args:
             file_path: Path object pointing to the media file
+            use_cache: Whether to use caching (default: True)
         """
         self.file_path = file_path
+        self.cache = Cache() if use_cache else None  # Singleton cache for @cached_method decorator
+        self.settings = None  # Will be set by Settings singleton if needed
         self._cache: dict[str, any] = {}  # Internal cache for method results
         try:
             self.info = mutagen.File(file_path) # type: ignore

renamer/extractors/tmdb_extractor.py

@@ -13,10 +13,11 @@ from ..settings import Settings
 class TMDBExtractor:
     """Class to extract TMDB movie information"""
 
-    def __init__(self, file_path: Path):
+    def __init__(self, file_path: Path, use_cache: bool = True):
         self.file_path = file_path
-        self.cache = Cache()
+        self.cache = Cache() if use_cache else None  # Singleton cache
-        self.ttl_seconds = Settings().get("cache_ttl_extractors", 21600)
+        self.settings = Settings()  # Singleton settings
+        self.ttl_seconds = self.settings.get("cache_ttl_extractors", 21600)
         self._movie_db_info = None
 
     def _get_cached_data(self, cache_key: str) -> Optional[Dict[str, Any]]:

renamer/formatters/special_info_formatter.py

@@ -15,21 +15,15 @@ class SpecialInfoFormatter:
         """Format database info dictionary or tuple/list into a string"""
         import logging
         import os
-        if os.getenv("FORMATTER_LOG"):
-            logging.info(f"format_database_info called with: {database_info!r} (type: {type(database_info)})")
         if isinstance(database_info, dict) and 'name' in database_info and 'id' in database_info:
             db_name = database_info['name']
             db_id = database_info['id']
             result = f"{db_name}id-{db_id}"
-            if os.getenv("FORMATTER_LOG"):
-                logging.info(f"Formatted dict to: {result!r}")
             return result
         elif isinstance(database_info, (tuple, list)) and len(database_info) == 2:
             db_name, db_id = database_info
             result = f"{db_name}id-{db_id}"
-            if os.getenv("FORMATTER_LOG"):
-                logging.info(f"Formatted tuple/list to: {result!r}")
             return result
         if os.getenv("FORMATTER_LOG"):
             logging.info("Returning None")
-        return None
+        return None

renamer/logging_config.py

@@ -0,0 +1,46 @@
+"""Singleton logging configuration for the renamer application.
+
+This module provides centralized logging configuration that is initialized
+once and used throughout the application.
+"""
+
+import logging
+import os
+import threading
+
+
+class LoggerConfig:
+    """Singleton logger configuration."""
+
+    _instance = None
+    _lock = threading.Lock()
+    _initialized = False
+
+    def __new__(cls):
+        """Create or return singleton instance."""
+        if cls._instance is None:
+            with cls._lock:
+                if cls._instance is None:
+                    cls._instance = super().__new__(cls)
+        return cls._instance
+
+    def __init__(self):
+        """Initialize logging configuration (only once)."""
+        if LoggerConfig._initialized:
+            return
+
+        # Check environment variable for formatter logging
+        if os.getenv('FORMATTER_LOG', '0') == '1':
+            logging.basicConfig(
+                filename='formatter.log',
+                level=logging.DEBUG,
+                format='%(asctime)s - %(levelname)s - %(message)s'
+            )
+        else:
+            logging.basicConfig(level=logging.INFO)
+
+        LoggerConfig._initialized = True
+
+
+# Initialize logging on import
+LoggerConfig()

renamer/services/conversion_service.py

@@ -11,6 +11,7 @@ This service manages the process of converting AVI/MPG/MPEG/WebM/MP4 files to MK
 import logging
 import subprocess
 import platform
+import re
 from pathlib import Path
 from typing import Optional, List, Dict, Tuple
 
@@ -216,6 +217,34 @@ class ConversionService:
         logger.debug(f"Found {len(subtitle_files)} subtitle files for {video_path.name}")
         return subtitle_files
 
+    def _expand_lang_counts(self, lang_str: str) -> List[str]:
+        """Expand language string with counts to individual languages.
+
+        Handles formats like:
+        - "2ukr" -> ['ukr', 'ukr']
+        - "ukr" -> ['ukr']
+        - "3eng" -> ['eng', 'eng', 'eng']
+
+        Args:
+            lang_str: Language string possibly with numeric prefix
+
+        Returns:
+            List of expanded language codes
+
+        Example:
+            >>> service._expand_lang_counts("2ukr")
+            ['ukr', 'ukr']
+        """
+        # Match pattern: optional number + language code
+        match = re.match(r'^(\d+)?([a-z]{2,3})$', lang_str.lower())
+        if match:
+            count = int(match.group(1)) if match.group(1) else 1
+            lang = match.group(2)
+            return [lang] * count
+        else:
+            # No numeric prefix, return as-is
+            return [lang_str.lower()]
+
     def map_audio_languages(
         self,
         extractor: MediaExtractor,
@@ -227,6 +256,8 @@ class ConversionService:
         in order. If filename has fewer languages than tracks, remaining
         tracks get None.
 
+        Handles numeric prefixes like "2ukr,eng" -> ['ukr', 'ukr', 'eng']
+
         Args:
             extractor: MediaExtractor with filename data
             audio_track_count: Number of audio tracks in the file
@@ -235,9 +266,10 @@ class ConversionService:
             List of language codes (or None) for each audio track
 
         Example:
-            >>> langs = service.map_audio_languages(extractor, 2)
+            >>> langs = service.map_audio_languages(extractor, 3)
+            >>> # For filename with [2ukr,eng]
             >>> print(langs)
-            ['ukr', 'eng']
+            ['ukr', 'ukr', 'eng']
         """
         # Get audio_langs from filename extractor
         audio_langs_str = extractor.get('audio_langs', 'Filename')
@@ -246,8 +278,13 @@ class ConversionService:
             logger.debug("No audio languages found in filename")
             return [None] * audio_track_count
 
-        # Split by comma and clean
+        # Split by comma and expand numeric prefixes
-        langs = [lang.strip().lower() for lang in audio_langs_str.split(',')]
+        lang_parts = [lang.strip() for lang in audio_langs_str.split(',')]
+        langs = []
+        for part in lang_parts:
+            langs.extend(self._expand_lang_counts(part))
+
+        logger.debug(f"Expanded languages from '{audio_langs_str}' to: {langs}")
 
         # Map to tracks (pad with None if needed)
         result = []

renamer/settings.py

@@ -1,11 +1,12 @@
 import json
 import os
+import threading
 from pathlib import Path
-from typing import Dict, Any
+from typing import Dict, Any, Optional
 
 
 class Settings:
-    """Manages application settings stored in a JSON file."""
+    """Manages application settings stored in a JSON file (Singleton)."""
 
     DEFAULTS = {
         "mode": "technical",  # "technical" or "catalog"
@@ -17,12 +18,30 @@ class Settings:
         "cache_ttl_posters": 2592000,  # 30 days in seconds
     }
 
+    _instance: Optional['Settings'] = None
+    _lock = threading.Lock()
+
+    def __new__(cls, config_dir: Path | None = None):
+        """Create or return singleton instance."""
+        if cls._instance is None:
+            with cls._lock:
+                if cls._instance is None:
+                    cls._instance = super().__new__(cls)
+                    cls._instance._initialized = False
+        return cls._instance
+
     def __init__(self, config_dir: Path | None = None):
+        """Initialize settings (only once)."""
+        # Only initialize once
+        if self._initialized:
+            return
+
         if config_dir is None:
             config_dir = Path.home() / ".config" / "renamer"
         self.config_dir = config_dir
         self.config_file = self.config_dir / "config.json"
         self._settings = self.DEFAULTS.copy()
+        self._initialized = True
         self.load()
 
     def load(self) -> None:

renamer/views/media_panel.py

@@ -126,6 +126,7 @@ class MediaPanelView:
                 self._props.title("Media Info Extraction"),
                 self._props.mediainfo_duration,
                 self._props.mediainfo_frame_class,
+                self._props.mediainfo_interlace,
                 self._props.mediainfo_resolution,
                 self._props.mediainfo_aspect_ratio,
                 self._props.mediainfo_hdr,

renamer/views/media_panel_properties.py

@@ -223,6 +223,14 @@ class MediaPanelProperties:
         """Get MediaInfo frame class formatted with label."""
         return self._extractor.get("frame_class", "MediaInfo")
 
+    @property
+    @conditional_decorators.wrap("Interlaced: ")
+    @text_decorators.colour(name="grey")
+    @conditional_decorators.default("Not extracted")
+    def mediainfo_interlace(self) -> str:
+        """Get MediaInfo interlace formatted with label."""
+        return self._extractor.get("interlaced", "MediaInfo")
+
     @property
     @conditional_decorators.wrap("Resolution: ")
     @text_decorators.colour(name="grey")

uv.lock

@@ -462,7 +462,7 @@ wheels = [
 
 [[package]]
 name = "renamer"
-version = "0.8.8"
+version = "0.8.9"
 source = { editable = "." }
 dependencies = [
     { name = "langcodes" },