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Sam Thursfield b7ccb6f516 export,info: Improve performance of --library mode
The library mode was slow due to use of item.formatted(), which
runs multiple database queries per item. The --include-keys option
didn't help because it filtered the after the queries had already
happened.

This commit reworks filtering so that we only query the fields
that the user requests. In many cases this can dramatically speed up
execution.

Before:

    > /usr/bin/time beet  export -l Bob Dylan > /dev/null
    13.42user 21.56system 0:35.71elapsed 97%CPU (0avgtext+0avgdata 52396maxresident)k

    > /usr/bin/time beet  export -l -i artist,title,path Bob Dylan > /dev/null
    13.25user 21.17system 0:35.14elapsed 97%CPU (0avgtext+0avgdata 52112maxresident)k

After:

    > /usr/bin/time beet  export -l Bob Dylan > /dev/null
    1.46user 0.09system 0:01.60elapsed 97%CPU (0avgtext+0avgdata 51188maxresident)k

    > /usr/bin/time beet  export -l -i artist,title,path Bob Dylan > /dev/null
    0.50user 0.07system 0:00.58elapsed 97%CPU (0avgtext+0avgdata 50632maxresident)k
2020-09-30 20:12:02 +02:00
.github Add broken link checker to integration test (#3703) 2020-09-04 15:42:36 -05:00
beets add possibility to select individual items to the remove CLI command 2020-09-13 14:26:00 +02:00
beetsplug export,info: Improve performance of --library mode 2020-09-30 20:12:02 +02:00
docs Add beats-ibroadcast to list of external plugins 2020-09-29 07:43:25 -05:00
extra beets.io now supports HTTPS 2019-06-06 15:34:15 +02:00
test export: Add --format=jsonlines option 2020-09-30 17:36:23 +02:00
.coveragerc remove references to nose 2020-07-07 15:28:38 -07:00
.gitignore add .venv/ to gitignore 2020-07-19 13:25:55 -05:00
appveyor.yml remove references to nose 2020-07-07 15:28:38 -07:00
beet add missing division future imports 2016-04-16 18:33:54 +02:00
codecov.yml Update codecov.yml for new configuration format? 2016-06-29 11:38:58 -07:00
CONTRIBUTING.rst Add broken link checker to integration test (#3703) 2020-09-04 15:42:36 -05:00
LICENSE Update copyright dates to 2016 2015-12-30 15:42:06 +00:00
MANIFEST.in Include extra bits in the source distribution 2016-08-22 23:54:36 -07:00
README.rst fix link to contributing page in readme 2020-07-20 19:56:05 -07:00
README_kr.rst beets.io now supports HTTPS 2019-06-06 15:34:15 +02:00
setup.cfg fix missing docstring-convention declaration 2020-07-29 20:32:53 -07:00
setup.py Fix rarfile 4.0 dependency conflict (#3711) 2020-08-01 16:35:53 -05:00
tox.ini Add broken link checker to integration test (#3703) 2020-09-04 15:42:36 -05:00

.. image:: https://img.shields.io/pypi/v/beets.svg
    :target: https://pypi.python.org/pypi/beets

.. image:: https://img.shields.io/codecov/c/github/beetbox/beets.svg
    :target: https://codecov.io/github/beetbox/beets

.. image:: https://github.com/beetbox/beets/workflows/ci/badge.svg?branch=master
    :target: https://github.com/beetbox/beets/actions

.. image:: https://repology.org/badge/tiny-repos/beets.svg
    :target: https://repology.org/project/beets/versions


beets
=====

Beets is the media library management system for obsessive music geeks.

The purpose of beets is to get your music collection right once and for all.
It catalogs your collection, automatically improving its metadata as it goes.
It then provides a bouquet of tools for manipulating and accessing your music.

Here's an example of beets' brainy tag corrector doing its thing::

  $ beet import ~/music/ladytron
  Tagging:
      Ladytron - Witching Hour
  (Similarity: 98.4%)
   * Last One Standing      -> The Last One Standing
   * Beauty                 -> Beauty*2
   * White Light Generation -> Whitelightgenerator
   * All the Way            -> All the Way...

Because beets is designed as a library, it can do almost anything you can
imagine for your music collection. Via `plugins`_, beets becomes a panacea:

- Fetch or calculate all the metadata you could possibly need: `album art`_,
  `lyrics`_, `genres`_, `tempos`_, `ReplayGain`_ levels, or `acoustic
  fingerprints`_.
- Get metadata from `MusicBrainz`_, `Discogs`_, and `Beatport`_. Or guess
  metadata using songs' filenames or their acoustic fingerprints.
- `Transcode audio`_ to any format you like.
- Check your library for `duplicate tracks and albums`_ or for `albums that
  are missing tracks`_.
- Clean up crufty tags left behind by other, less-awesome tools.
- Embed and extract album art from files' metadata.
- Browse your music library graphically through a Web browser and play it in any
  browser that supports `HTML5 Audio`_.
- Analyze music files' metadata from the command line.
- Listen to your library with a music player that speaks the `MPD`_ protocol
  and works with a staggering variety of interfaces.

If beets doesn't do what you want yet, `writing your own plugin`_ is
shockingly simple if you know a little Python.

.. _plugins: https://beets.readthedocs.org/page/plugins/
.. _MPD: https://www.musicpd.org/
.. _MusicBrainz music collection: https://musicbrainz.org/doc/Collections/
.. _writing your own plugin:
    https://beets.readthedocs.org/page/dev/plugins.html
.. _HTML5 Audio:
    http://www.w3.org/TR/html-markup/audio.html
.. _albums that are missing tracks:
    https://beets.readthedocs.org/page/plugins/missing.html
.. _duplicate tracks and albums:
    https://beets.readthedocs.org/page/plugins/duplicates.html
.. _Transcode audio:
    https://beets.readthedocs.org/page/plugins/convert.html
.. _Discogs: https://www.discogs.com/
.. _acoustic fingerprints:
    https://beets.readthedocs.org/page/plugins/chroma.html
.. _ReplayGain: https://beets.readthedocs.org/page/plugins/replaygain.html
.. _tempos: https://beets.readthedocs.org/page/plugins/acousticbrainz.html
.. _genres: https://beets.readthedocs.org/page/plugins/lastgenre.html
.. _album art: https://beets.readthedocs.org/page/plugins/fetchart.html
.. _lyrics: https://beets.readthedocs.org/page/plugins/lyrics.html
.. _MusicBrainz: https://musicbrainz.org/
.. _Beatport: https://www.beatport.com

Install
-------

You can install beets by typing ``pip install beets``.
Beets has also been packaged in the `software repositories`_ of several distributions.
Check out the `Getting Started`_ guide for more information.

.. _Getting Started: https://beets.readthedocs.org/page/guides/main.html
.. _software repositories: https://repology.org/project/beets/versions

Contribute
----------

Thank you for considering contributing to ``beets``! Whether you're a programmer or not, you should be able to find all the info you need at `CONTRIBUTING.rst`_.

.. _CONTRIBUTING.rst: https://github.com/beetbox/beets/blob/master/CONTRIBUTING.rst

Read More
---------

Learn more about beets at `its Web site`_. Follow `@b33ts`_ on Twitter for
news and updates.

.. _its Web site: https://beets.io/
.. _@b33ts: https://twitter.com/b33ts/

Contact
-------
* Encountered a bug you'd like to report or have an idea for a new feature? Check out our `issue tracker`_! If your issue or feature hasn't already been reported, please `open a new ticket`_ and we'll be in touch with you shortly. If you'd like to vote on a feature/bug, simply give a :+1: on issues you'd like to see prioritized over others.
* Need help/support, would like to start a discussion, or would just like to introduce yourself to the team? Check out our `forums`_!

.. _issue tracker: https://github.com/beetbox/beets/issues
.. _open a new ticket: https://github.com/beetbox/beets/issues/new/choose
.. _forums: https://discourse.beets.io/

Authors
-------

Beets is by `Adrian Sampson`_ with a supporting cast of thousands.

.. _Adrian Sampson: https://www.cs.cornell.edu/~asampson/