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Contents
module Coltrane
module Commands
class FindScale < Command
attr_reader :scale_set
def initialize(scale_set)
@scale_set = scale_set
end
def representation
scale_set
end
def self.mercenary_init(program)
program.command(:'find-scale') do |c|
c.syntax 'find-scale --notes C-D-E-...] OR --chord Cmaj7-Db7'
c.description 'finds scales with the provided --notes or --chord'
c.option :notes, '--notes C-D-E', 'Find scales with those notes'
c.option :chords, '--chords Cmaj7-D11', 'find scales with those chords'
c.action do |(_), notes: nil, chords: nil|
begin
if notes
Theory::Scale.having_notes(
Theory::NoteSet[*notes.to_s.split('-')]
)
elsif chords
Theory::Scale.having_chords(*chords.to_s.split('-'))
else
raise 'Provide --notes or --chords separated by dashes.' \
'For example coltrane find-scale --notes C-E-F#'
end
end
.yield_self { |scale_set| new(scale_set).render }
end
end
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems