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Versions: 13
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Contents
module Coltrane
module Commands
class Progression < Command
def self.mercenary_init(program)
program.command(:progression) do |c|
c.syntax 'progression <roman numeral notation> in <key> [--on <instrument>]'
c.description 'Gives you chords of a progression in a key. Ex: coltrane progression I-IV-iv-V in Am --on guitar'
add_shared_option(:flavor, c)
add_shared_option(:on, c)
add_shared_option(:voicings, c)
c.action do |(prog, _, key), **options|
prog
.tr('-', '_')
.yield_self { |possible_method|
if Theory::Progression.respond_to?(possible_method)
Theory::Progression.send(possible_method, key)
else
Theory::Progression.new(prog, key: key)
end
}
.chords
.each { |chord| Commands::Chords.new(chord, **options).render }
end
end
end
end
end
end
Version data entries
13 entries across 13 versions & 1 rubygems