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# This file is part of beets.
# Copyright 2013, Dang Mai <>.
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.

"""Generates smart playlists based on beets queries.
from __future__ import print_function

from beets.plugins import BeetsPlugin
from beets import config, ui
from beets.util import normpath, syspath
from beets.util.functemplate import Template
import os

# Global variable so that smartplaylist can detect database changes and run
# only once before beets exits.
database_changed = False

def update_playlists(lib):
    ui.print_("Updating smart playlists...")
    playlists = config['smartplaylist']['playlists'].get(list)
    playlist_dir = config['smartplaylist']['playlist_dir'].as_filename()
    relative_to = config['smartplaylist']['relative_to'].get()
    if relative_to:
        relative_to = normpath(relative_to)

    for playlist in playlists:
        items = lib.items(playlist['query'])
        m3us = {}
        basename = playlist['name'].encode('utf8')
        # As we allow tags in the m3u names, we'll need to iterate through
        # the items and generate the correct m3u file names.
        for item in items:
            m3u_name = item.evaluate_template(Template(basename), lib=lib)
            if not (m3u_name in m3us):
                m3us[m3u_name] = []
            if relative_to:
                m3us[m3u_name].append(os.path.relpath(item.path, relative_to))
        # Now iterate through the m3us that we need to generate
        for m3u in m3us:
            m3u_path = normpath(os.path.join(playlist_dir, m3u))
            with open(syspath(m3u_path), 'w') as f:
                for path in m3us[m3u]:
                    f.write(path + '\n')
    ui.print_("... Done")

class SmartPlaylistPlugin(BeetsPlugin):
    def __init__(self):
        super(SmartPlaylistPlugin, self).__init__()
            'relative_to': None,
            'playlist_dir': u'.',
            'playlists': []

    def commands(self):
        def update(lib, opts, args):
        spl_update = ui.Subcommand('splupdate',
            help='update the smart playlists')
        spl_update.func = update
        return [spl_update]

def handle_change(lib):
    global database_changed
    database_changed = True

def update(lib):
    if database_changed: