Class: Coltrane::Commands::Scale

Inherits:
Command
  • Object
show all
Defined in:
lib/coltrane/commands/scale.rb

Constant Summary

Constants inherited from Command

Command::COMMON_OPTIONS

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Command

add_shared_option, #custom_guitar, inherited, #render, #renderer_options, subclasses

Class Method Details

.mercenary_init(program) ⇒ Object 



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# File 'lib/coltrane/commands/scale.rb', line 17

def self.mercenary_init(program)
  program.command(:scale) do |c|
    c.syntax 'scale <root_note> <scale name> [--on <instrument>]'
    c.description 'Gives you information about a scale. Ex: coltrane scale D Natural Minor --on guitar'
    c.option :tertians, '--tertians <SIZE>', 'Outputs all tertian chords from the given size from the scale'
    c.option :chords,   '--chords [SIZE]', 'Outputs all chords from given size from the scale. Leave size empty to retrieve all'
    add_shared_option(:flavor, c)
    add_shared_option(:on, c)
    add_shared_option(:voicings, c)

    c.action { |scale_notation, **options|
      parse(scale_notation.join(' '))
      .yield_self { |scale|
        if options[:tertians]
          scale
          .tertians(options[:tertians].to_i)
          .each { |chord| Commands::Chords.new(chord, **options).render }
        elsif options[:chords]
          scale.chords(options[:chords].to_i)
          .each { |chord| Commands::Chords.new(chord, **options).render }
        else
          scale.notes
          .yield_self {|notes| Commands::Notes.new(notes, **options.merge(preface: scale.full_name)).render }
        end
      }
    }
  end
end

.parse(scale_notation) ⇒ Object 



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# File 'lib/coltrane/commands/scale.rb', line 9

def self.parse(scale_notation)
  scale_notation
  .split(' ', 2)
  .yield_self { |(tone, scale_name)|
    Theory::Scale.fetch(scale_name.gsub(' ', '_'), tone)
  }
end

Instance Method Details

#representation ⇒ Object 



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# File 'lib/coltrane/commands/scale.rb', line 4

def representation
  return on_model if on == :text
  { preface => on_model }
end