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 InvalidLyricsException which means we did not get any valid
  13     # artist/song from any of the sources
  14     #
  15     # @raise [Lyricli::InvalidLyricsException] because we found nothing
  16     def exit_with_error
  17       raise InvalidLyricsException
  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       set_current_track
  26       check_params
  27
  28       engine = LyricsEngine.new(@current_track[:artist], @current_track[:song])
  29
  30       begin
  31         engine.get_lyrics
  32       rescue LyricsNotFoundException
  33         "Lyrics not found :("
  34       end
  35     end
  36
  37     # Set the `@current_track` instance variable by asking the SourceManager for
  38     # its current track
  39     def set_current_track
  40       @current_track = @source_manager.current_track
  41     end
  42
  43     # Exits with error when there is an empty field from the current track.
  44     def check_params
  45       self.exit_with_error if @current_track[:artist].nil? or @current_track[:artist].empty?
  46       self.exit_with_error if @current_track[:song].nil? or @current_track[:song].empty?
  47     end
  48   end
  49 end