git.r.bdr.sh - rbdr/lyricli.rb/blob - lib/lyricli/lyricli.rb

   1 module Lyricli
   2
   3   # This class has the basic logic for extracting the lyrics and controlling the
   4   # application
   5   class Lyricli
   6
   7     # Constructor, initializes `@source_manager`
   8     def initialize
   9       @source_manager = SourceManager.new
  10     end
  11
  12     # Raises an InvalidLyricsError which means we did not get any valid
  13     # artist/song from any of the sources
  14     #
  15     # @raise [Lyricli::Exceptions::InvalidLyricsError] because we found nothing
  16     def exit_with_error
  17       raise Exceptions::InvalidLyricsError
  18     end
  19
  20     # Extracts the current track, validates it and requests the lyrics from our
  21     # LyricsEngine
  22     #
  23     # @return [String] the found lyrics, or a string indicating none were found
  24     def get_lyrics
  25
  26       begin
  27         set_current_track
  28         check_params
  29       rescue Exceptions::InvalidLyricsError
  30         return "No Artist/Song could be found :("
  31       end
  32
  33       engine = LyricsEngine.new(@current_track[:artist], @current_track[:song])
  34
  35       begin
  36         return engine.get_lyrics
  37       rescue Exceptions::LyricsNotFoundError
  38         return "Lyrics not found :("
  39       end
  40     end
  41
  42     # Set the `@current_track` instance variable by asking the SourceManager for
  43     # its current track
  44     def set_current_track
  45       @current_track = @source_manager.current_track
  46     end
  47
  48     # Exits with error when there is an empty field from the current track.
  49     def check_params
  50       self.exit_with_error unless @current_track
  51       self.exit_with_error if @current_track[:artist].nil? or @current_track[:artist].empty?
  52       self.exit_with_error if @current_track[:song].nil? or @current_track[:song].empty?
  53     end
  54   end
  55 end