cs-mediainfo 20260531

Simple minded facilities for media information inferred from filenames. This contains mostly lexical functions for extracting information from strings or constructing media filenames from metadata and a few classes like `EpisodeInfo` and `SeriesEpisodeInfo` for common descriptions.

Simple minded facilities for media information inferred from filenames. This contains mostly lexical functions for extracting information from strings or constructing media filenames from metadata and a few classes like EpisodeInfo and SeriesEpisodeInfo for common descriptions.

Latest release 20260531: Bugfix a parse return value, small doc updates.

The default filename parsing rules are based on my personal convention, which is to name media files as:

series_name--episode_info--title--source--etc-etc.ext

where the components are:

• series_name: the programme series name downcased and with whitespace replaced by dashes; in the case of standalone items like movies this is often the studio.
• episode_info: a structured field with episode information: sn is a series/season, enis an episode number within the season,x_n_ is a "extra" - addition material supplied with the season, etc.
• title: the episode title downcased and with whitespace replaced by dashes.
• source: the source of the media.
• ext: filename extension such as mp4.

As you may imagine, as a rule I dislike mixed case filenames and filenames with embedded whitespace. I also like a media filename to contain enough information to identify the file contents in a compact and human readable form.

Short summary:

• EpisodeDatumDefn: An EpisodeInfo marker definition with the following components: - name: the marker name, such as "series" or "episode" - prefix: the stub used in a filename, such as "s" or "e" - re: a regular expression to match the prefix an some digits.
• EpisodeInfo: Trite class for episodic information, used to store, match or transcribe series/season, episode, etc values.
• main: Main command line running some test code.
• parse_name: Parse the descriptive part of a filename (the portion remaining after stripping the file extension) and yield (part,fields) for each part as delineated by sep.
• part_to_title: Convert a filename part into a title string.
• pathname_info: Parse information from the basename of a file pathname. Return a mapping of field => values in the order parsed.
• scrub_title: Strip redundant text from the start of an episode title.
• SeriesEpisodeInfo: Episode information from a TV series episode.
• title_to_part: Convert a title string into a filename part. This is lossy; the part_to_title function cannot completely reverse this.

Module contents:

• class EpisodeDatumDefn(EpisodeDatumDefn): An EpisodeInfo marker definition with the following components:
  • name: the marker name, such as "series" or "episode"
  • prefix: the stub used in a filename, such as "s" or "e"
  • re: a regular expression to match the prefix an some digits

EpisodeDatumDefn.parse(self, s, offset=0): Parse an episode datum from a string, return the value and new offset. Raise ValueError if the string doesn't match this definition.

Parameters:

• s: the string
• offset: parse offset, default 0

• class EpisodeInfo(types.SimpleNamespace): Trite class for episodic information, used to store, match or transcribe series/season, episode, etc values.

EpisodeInfo.__getitem__(self, name): We can look up values by name.

EpisodeInfo.as_dict(self): Return the episode info as a dict.

EpisodeInfo.as_tags(self, prefix=None): Generator yielding the episode info as Tags.

EpisodeInfo.from_filename_part(s, offset=0): Factory to return an EpisodeInfo from a filename episode field.

Parameters:

• s: the string containing the episode information
• offset: the start of the episode information, default 0

The episode information must extend to the end of the string because the factory returns just the information. See the parse_filename_part class method for the core parse.

EpisodeInfo.get(self, name, default=None): Look up value by name with default.

EpisodeInfo.parse_filename_part(s, offset=0): Parse episode information from a string, returning the matched fields and the new offset.

Parameters: s: the string containing the episode information. offset: the starting offset of the information, default 0.

EpisodeInfo.season: .season property, synonym for .series

• main(argv=None): Main command line running some test code.

• parse_name(name, sep='--'): Parse the descriptive part of a filename (the portion remaining after stripping the file extension) and yield (part,fields) for each part as delineated by sep.

• part_to_title(part): Convert a filename part into a title string.

  Example:

  >>> part_to_title('episode-name')
  'Episode Name'
  

• pathname_info(pathname): Parse information from the basename of a file pathname. Return a mapping of field => values in the order parsed.

• scrub_title(title: str, *, season=None, episode=None) -> str: Strip redundant text from the start of an episode title.

  I frequently get "title" strings with leading season/episode information. This function cleans up these strings to return the unadorned title.

• class SeriesEpisodeInfo(cs.deco.Promotable): Episode information from a TV series episode.

SeriesEpisodeInfo.as_dict(self): Return the non-None values as a dict. Note that this uses dataclasses.asdict() and as such is a deep copy.

SeriesEpisodeInfo.from_str(episode_title: str, series=None): Infer a SeriesEpisodeInfo from an episode title.

This recognises the common 'sSSeEE - Episode Title' format and variants like Series Name - sSSeEE - Episode Title' or 'sSSeEE - Episode Title - Part: One'.

• title_to_part(title): Convert a title string into a filename part. This is lossy; the part_to_title function cannot completely reverse this.

  Example:

  >>> title_to_part('Episode Name')
  'episode-name'
  

Release Log

Release 20260531: Bugfix a parse return value, small doc updates.

Release 20240519: Initial PyPI release, particularly for SeriesEpisodeInfo which I use in cs.app.playon.