cs-fstags 20200113

Simple filesystem based file tagging and the associated `fstags` command line script.

Latest release 20200113: Mirror tags to user.cs.fstags xattr to honour Linux namespace requirements. Add "filesize" to available tag string format (-o option). Small bugfixes.

Simple filesystem based file tagging and the associated fstags command line script.

Tags are stored in a file .fstags in directories with a line for each entry in the directory consisting of the directory entry name and the associated tags.

The tags for a file are the union of its direct tags and all relevant ancestor tags, with priority given to tags closer to the file.

For example, a media file for a television episode with the pathname /path/to/series-name/season-02/episode-name--s02e03--something.mp4 might obtain the tags:

series.title="Series Full Name"
season=2
sf
episode=3
episode.title="Full Episode Title"

from the following .fstags files and entries:

• /path/to/.fstags: series-name sf series.title="Series Full Name"
• /path/to/series-name/.fstags: season-02 season=2
• /path/to/series-name/season-02.fstags: episode-name--s02e03--something.mp4 episode=3 episode.title="Full Episode Title"

Tags may be "bare", or have a value. If there is a value it is expressed with an equals ('=') followed by the JSON encoding of the value.

Class FSTags

A class to examine filesystem tags.

Class FSTagsCommand(cs.cmdutils.BaseCommand)

fstag main command line class.

Function infer_tags(name, rules=None)

Infer Tags from name via rules. Return a TagSet.

rules is an iterable of objects with a .infer_tags(name) method which returns an iterable of Tags.

Function loadrc(rcfilepath=None)

Read rc file, return rules.

If rcfilepath is None default to '~/.fstagsrc' (from RCFILE).

Function main(argv=None)

Command line mode.

Class RegexpTagRule

A regular expression based Tag rule.

Function rfilepaths(path, name_selector=None)

Generator yielding pathnames of files found under path.

Function rpaths(path, yield_dirs=False, name_selector=None)

Generator yielding pathnames found under path.

Function rsync_patterns(paths, top_path)

Return a list of rsync include lines suitable for use with the --include-from option.

Class Tag

A Tag has a .name (str) and a .value.

The name must be a dotted identifier.

A "bare" Tag has a value of None.

Class TagChoice(TagChoice,builtins.tuple)

A "tag choice", an apply/reject flag and a Tag, used to apply changes to a TagSet or as a criterion for a tag search.

Attributes:

• spec: the source text from which this choice was parsed, possible None
• choice: the apply/reject flag
• tag: the Tag representing the criterion

Class TagFile

A reference to a specific file containing tags.

This manages a mapping of name => TagSet, itself a mapping of tag name => tag value.

Class TagFileEntry(builtins.tuple)

TagFileEntry(tagfile, name)

Class TaggedPath

Class to manipulate the tags for a specific path.

Class TagSet

A setlike class associating a set of tag names with values. A TagFile maintains one of these for each name.

Method TagSet.__init__(self, *, defaults=None)

Initialise the TagSet.

Parameters:

• defaults: a mapping of name->TagSet to provide default values.

Release Log

Release 20200113: Mirror tags to user.cs.fstags xattr to honour Linux namespace requirements. Add "filesize" to available tag string format (-o option). Small bugfixes.

Release 20191230: Command line: new "find" command to search a file tree based on tags. Command line: new "mv" command to move a file and its tags. Command line: Python string formats for "find" and "ls" output. TaggedPath.autotag: new optional no_save parameter, default False, to suppress update of the associated .fstags file. Inital and untested "mirror tags to xattrs" support.

Release 20191201: New "edit" subcommand to rename files and edit tags.

Release 20191130.1: Initial release: fstags, filesystem based tagging utility.