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track.rb
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track.rb
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# coding: utf-8
module Hallon
# Tracks are an essential part to the Spotify service. They
# are browsable entities that can also be played by streaming.
#
# @see http://developer.spotify.com/en/libspotify/docs/group__track.html
class Track < Base
extend Linkable
from_link :as_track_and_offset
to_link :from_track
# Overriden to use default parameter.
# @see #to_link
alias_method :_to_link, :to_link
# Create a Link to the current track and offset in seconds.
#
# @param [Float] offset offset into track in seconds
# @return [Hallon::Link]
def to_link(offset = offset)
_to_link (offset * 1000).to_i
end
# Offset into track in seconds this track was created with.
#
# @return [Rational]
attr_reader :offset
# Construct a new Track instance.
#
# @param [String, Link, FFI::Pointer] link
def initialize(link)
FFI::MemoryPointer.new(:int) do |ptr|
@pointer = Spotify::Pointer.new from_link(link, ptr), :track, true
@offset = Rational(ptr.read_int, 1000)
end
end
# Create a new local track.
#
# @param [String] title
# @param [String] artist
# @param [String] album
# @param [Integer] length
# @return [Track]
def self.local(title, artist, album = nil, length = nil)
track = Spotify.localtrack_create(artist, title, album || "", length || -1)
new(track)
end
# @note This’ll be an empty string unless the track is loaded.
# @return [String]
def name
Spotify.track_name(@pointer)
end
# Duration of the track in seconds.
#
# @note This’ll be `0` unless the track is loaded.
# @return [Rational]
def duration
Rational(Spotify.track_duration(@pointer), 1000)
end
# Track popularity, between 0 and 1.
#
# @note This’ll be `0` unless the track is loaded.
# @return [Rational]
def popularity
Rational(Spotify.track_popularity(@pointer), 100)
end
# Disc number this track appears in.
#
# @note This function is a bit special. See libspotify docs for details.
def disc
Spotify.track_disc(@pointer)
end
# Position of track on its’ disc.
#
# @note This function is a bit special. See libspotify docs for details.
def index
Spotify.track_index(@pointer)
end
# Retrieve track error status.
#
# @return [Symbol]
def status
Spotify.track_error(@pointer)
end
# True if the track is loaded
#
# @return [Boolean]
def loaded?
Spotify.track_is_loaded(@pointer)
end
# Album this track belongs to.
#
# @note This’ll be `nil` unless the track is loaded.
# @return [Hallon::Album]
def album
album = Spotify.track_album(@pointer)
Album.new(album) unless album.null?
end
# Artist who performed this Track.
#
# @note There may be more than one artist, see {#artists} for retrieving them all!
# @see #artists
# @return [Hallon::Artist, nil]
def artist
artists.first
end
# All {Artist}s who performed this Track.
#
# @note Track must be loaded, or you’ll get zero artists.
# @return [Hallon::Enumerator<Artist>]
def artists
size = Spotify.track_num_artists(@pointer)
Enumerator.new(size) do |i|
artist = Spotify.track_artist(@pointer, i)
Artist.new(artist) unless artist.null?
end
end
# True if the Track is available.
#
# @note This’ll always return false unless the track is loaded.
# @return [Boolean]
def available?
Spotify.track_is_available(session.pointer, @pointer)
end
# True if the Track is a local track.
#
# @note This’ll always return false unless the track is loaded.
# @return [Boolean]
def local?
Spotify.track_is_local(session.pointer, @pointer)
end
# True if the Track is autolinked.
#
# @note This’ll always return false unless the track is loaded.
# @return [Boolean]
def autolinked?
Spotify.track_is_autolinked(session.pointer, @pointer)
end
# True if the track is starred.
#
# @note This’ll always return false unless the track is loaded.
# @return [Boolean]
def starred?
Spotify.track_is_starred(session.pointer, @pointer)
end
# Set {#starred?} status of current track.
#
# @note It’ll set the starred status for the current Session.instance.
# @param [Boolean] starred
# @return [Boolean]
def starred=(starred)
starred ? session.star(self) : session.unstar(self)
end
end
end