Class: Chords::CommandLineParser

Inherits:
Object
  • Object
show all
Defined in:
lib/chords/command_line_parser.rb

Instance Method Summary collapse

Constructor Details

#initialize(args) ⇒ CommandLineParser

Returns a new instance of CommandLineParser.



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# File 'lib/chords/command_line_parser.rb', line 7

def initialize(args)
  @args = args
  @frets = Chords::Fretboard::DEFAULT_FRETS
  @duplicates = 0
  @max_fret_distance = Chords::Fingering::DEFAULT_MAX_FRET_DISTANCE
  @tuning = Chords::Fretboard::TUNINGS[:standard]
  @formatter = Chords::TextFormatter
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/chords/command_line_parser.rb', line 16

def parse
  @opts = OptionParser.new
  @opts.banner = "Usage: chords [options] CHORD"
  
  @opts.on("-l", "--list", 
          "List tunings and chords.") do
    puts tunings_and_chords
    exit
  end
    
  @opts.on("-f", "--frets NUMBER_OF_FRETS",
          Integer,
          "Number of frets, i.e. max position in fingerings.") do |frets|
    @frets = frets
  end
  
  @opts.on("-d", "--duplicates DUPLICATES",
          Integer,
          "Number of duplicated notes.") do |duplicates|
    @duplicates = duplicates
  end
  
  @opts.on("-m", "--max-fret-distance MAX_FRET_DISTANCE",
          Integer,
          "Maximum distance between positions in fingering.") do |mfd|
    @max_fret_distance = mfd
  end
  
  @opts.on("-t", "--tuning TUNING", 
          "Tuning to use. See -l for list of available tunings and chords.") do |t|
    begin
      @tuning = Fretboard.send(t.downcase).open_notes
    rescue Exception => e
      raise OptionParser::ParseError.new("Invalid tuning")
    end
  end
  
  @opts.on("--pdf", "Output to pdf. Requires Prawn.") do
    begin
      require 'chords/pdf_formatter'
    rescue LoadError => e
      puts "#{e.message}\n\nMake sure you have 'prawn' gem installed."
      exit(1)
    end
    @formatter = Chords::PDFFormatter
  end
  
  @opts.on("--html", "Output to html. Requires RMagick.") do
    begin
      require 'chords/html_formatter'
    rescue LoadError => e
      puts "#{e.message}\n\nMake sure you have 'rmagick' gem installed."
      exit(1)
    end
    @formatter = Chords::HTMLFormatter
  end
  
  @opts.on_tail("-h", "--help", examples) do
    puts @opts
  end
  
  begin
    print_chord @opts.parse!(@args)
  rescue OptionParser::ParseError => e
    puts e.message
  end
end