Duplicates Plugin
=================

This plugin adds a new command, ``duplicates`` or ``dup``, which finds and lists
duplicate tracks or albums in your collection.

Usage
-----

To use the ``duplicates`` plugin, first enable it in your configuration (see
:ref:`using-plugins`).

By default, the ``beet duplicates`` command lists the names of tracks in your
library that are duplicates. It assumes that Musicbrainz track and album ids are
unique to each track or album. That is, it lists every track or album with an ID
that has been seen before in the library. You can customize the output format,
count the number of duplicate tracks or albums, and list all tracks that have
duplicates or just the duplicates themselves via command-line switches

::

    -h, --help            show this help message and exit
    -f FMT, --format=FMT  print with custom format
    -a, --album           show duplicate albums instead of tracks
    -c, --count           count duplicate tracks or albums
    -C PROG, --checksum=PROG
                          report duplicates based on arbitrary command
    -d, --delete          delete items from library and disk
    -F, --full            show all versions of duplicate tracks or albums
    -s, --strict          report duplicates only if all attributes are set
    -k, --key            report duplicates based on keys (can be used multiple times)
    -M, --merge           merge duplicate items
    -m DEST, --move=DEST  move items to dest
    -o DEST, --copy=DEST  copy items to dest
    -p, --path            print paths for matched items or albums
    -t TAG, --tag=TAG     tag matched items with 'k=v' attribute
    -r, --remove          remove items from library

Configuration
-------------

To configure the plugin, make a ``duplicates:`` section in your configuration
file. The available options mirror the command-line options:

- **album**: List duplicate albums instead of tracks. Default: ``no``.
- **checksum**: Use an arbitrary command to compute a checksum of items. This
  overrides the ``keys`` option the first time it is run; however, because it
  caches the resulting checksum as ``flexattrs`` in the database, you can use
  ``--key=name_of_the_checksumming_program --key=any_other_keys`` (or set the
  ``keys`` configuration option) the second time around. Default: ``ffmpeg -i
  {file} -f crc -``.
- **copy**: A destination base directory into which to copy matched items.
  Default: none (disabled).
- **count**: Print a count of duplicate tracks or albums in the format
  ``$albumartist - $album - $title: $count`` (for tracks) or ``$albumartist -
  $album: $count`` (for albums). Default: ``no``.
- **delete**: Remove matched items from the library and from the disk. Default:
  ``no``
- **format**: A specific format with which to print every track or album. This
  uses the same template syntax as beets' :doc:`path
  formats</reference/pathformat>`. The usage is inspired by, and therefore
  similar to, the :ref:`list <list-cmd>` command. Default: :ref:`format_item`
- **full**: List every track or album that has duplicates, not just the
  duplicates themselves. Default: ``no``
- **keys**: Define in which track or album fields duplicates are to be searched.
  By default, the plugin uses the musicbrainz track and album IDs for this
  purpose. Using the ``keys`` option (as a YAML list in the configuration file,
  or as space-delimited strings in the command-line), you can extend this
  behavior to consider other attributes. Default: ``[mb_trackid, mb_albumid]``
- **merge**: Merge duplicate items by consolidating tracks and-or metadata where
  possible.
- **move**: A destination base directory into which it will move matched items.
  Default: none (disabled).
- **path**: Output the path instead of metadata when listing duplicates.
  Default: ``no``.
- **strict**: Do not report duplicate matches if some of the attributes are not
  defined (ie. null or empty). Default: ``no``
- **tag**: A ``key=value`` pair. The plugin will add a new ``key`` attribute
  with ``value`` value as a flexattr to the database for duplicate items.
  Default: ``no``.
- **tiebreak**: Dictionary of lists of attributes keyed by ``items`` or
  ``albums`` to use when choosing duplicates. By default, the tie-breaking
  procedure favors the most complete metadata attribute set. If you would like
  to consider the lower bitrates as duplicates, for example, set ``tiebreak:
  items: [bitrate]``. Default: ``{}``.
- **remove**: Remove matched items from the library, but not from the disk.
  Default: ``no``.

Examples
--------

List all duplicate tracks in your collection:

::

    beet duplicates

List all duplicate tracks from 2008:

::

    beet duplicates year:2008

Print out a unicode histogram of duplicate track years using spark_:

::

    beet duplicates -f '$year' | spark
    ▆▁▆█▄▇▇▄▇▇▁█▇▆▇▂▄█▁██▂█▁▁██▁█▂▇▆▂▇█▇▇█▆▆▇█▇█▇▆██▂▇

Print out a listing of all albums with duplicate tracks, and respective counts:

::

    beet duplicates -ac

The same as the above but include the original album, and show the path:

::

    beet duplicates -acf '$path'

Get tracks with the same title, artist, and album:

::

    beet duplicates -k title -k albumartist -k album

Compute Adler CRC32 or MD5 checksums, storing them as flexattrs, and report back
duplicates based on those values:

::

    beet dup -C 'ffmpeg -i {file} -f crc -'
    beet dup -C 'md5sum {file}'

Copy highly danceable items to ``party`` directory:

::

    beet dup --copy /tmp/party

Move likely duplicates to ``trash`` directory:

::

    beet dup --move ${HOME}/.Trash

Delete items (careful!), if they're Nickelback:

::

    beet duplicates --delete -k albumartist -k albumartist:nickelback

Tag duplicate items with some flag:

::

    beet duplicates --tag dup=1

Ignore items with undefined keys:

::

    beet duplicates --strict

Merge and delete duplicate albums with different missing tracks:

::

    beet duplicates --album --merge --delete

.. _spark: https://github.com/holman/spark
