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Contents
module Coltrane
module Commands
class CommonChords < Command
def self.parse(scale_notation)
scale_notation
.split(' ', 2)
.yield_self { |(tone, scale_name)|
Theory::Scale.fetch(scale_name.gsub(' ', '_'), tone)
}
end
def self.mercenary_init(program)
program.command(:'common-chords') do |c|
c.alias(:'common-chord')
add_shared_option(:flavor, c)
add_shared_option(:on, c)
c.syntax 'common-chords [TONE_1 SCALE_NAME_1], [TONE_2 SCALE_NAME_2], [...]'
c.description 'Finds chords that are shared between the given scales'
c.action do |(*scale_strings), **options|
scale_strings
.join(' ')
.split(',')
.map { |scale_notation|
Commands::Scale.parse(scale_notation).all_chords
}
.reduce(:&)
.each { |chord| Commands::Chords.new(chord, **options).render }
end
end
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems