Class: FretViewer::DoSomething

Inherits:
Object
  • Object
show all
Includes:
Curses
Defined in:
lib/fret_viewer/do_something.rb

Instance Method Summary collapse

Constructor Details

#initialize(options, out: stdout, err: stderr) ⇒ DoSomething

Returns a new instance of DoSomething.



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# File 'lib/fret_viewer/do_something.rb', line 40

def initialize(options, out: stdout, err: stderr)
  @options = options
  @out = out
  @err = err
end

Instance Method Details

#note_on_string(note) ⇒ Object 



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# File 'lib/fret_viewer/do_something.rb', line 46

def note_on_string(note)
  return note if note.size == 2

  "#{note}-"
end

#show ⇒ Object 



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# File 'lib/fret_viewer/do_something.rb', line 69

def show
  root_note = @options[:key].upcase
  unless NOTES[:sharp].include? root_note
    puts "Note #{@options[:key]} not recognized yet"
    exit 1
  end

  full_scale = [0, 2, 4, 5, 7, 9, 11]
  chords = {
    "a" => {
      scale: [ 0, 4, 7],
      label: ''
    },
    "s" => {
      scale: [ 2, 5, 9],
      label: 'm'
    },
    "d" => {
      scale: [ 4, 7,11],
      label: 'm'
    },
    "f" => {
      scale: [ 5, 9, 0],
      label: ''
    },
    "g" => {
      scale: [ 7,11, 2],
      label: ''
    },
    "h" => {
      scale: [ 9, 0, 4],
      label: 'm'
    },
    "j" => {
      scale: [11, 2, 5],
      label: '0'
    },
    "q" => {
      scale: [ 0, 4, 7,11],
      label: 'maj7'
    },
    "w" => {
      scale: [ 2, 5, 9, 0],
      label: 'm7'
    },
    "e" => {
      scale: [ 4, 7,11, 2],
      label: 'm7'
    },
    "r" => {
      scale: [ 5, 9, 0, 4],
      label: 'maj7'
    },
    "t" => {
      scale: [ 7,11, 2, 5],
      label: '7'
    },
    "y" => {
      scale: [ 9, 0, 4, 7],
      label: 'm7'
    },
    "u" => {
      scale: [11, 2, 5, 9],
      label: 'o'
    },
    "1" => {
      scale: [0, 2, 4, 7, 9],
      label: ' M pent'
    },
    "2" => {
      scale: [0, 2, 5, 7, 9],
      label: ' m pent'
    },
    "3" => {
      scale: [2, 4, 7, 9, 11],
      label: ' m pent'
    },
  }
  note_index_of_root_note = NOTES[:sharp].index root_note
  key_name = root_note

  init_screen
  begin
    crmode

    input_key = nil
    input_to_show = " "

    until input_key == ' ' do
      if input_key == input_to_show && chords.keys.include?(input_key)
        input_key = 'p' # toggle between chord and full scale
      end
      if input_key == 'z'
        note_index_of_root_note = (note_index_of_root_note + 5) % 12
      elsif input_key == 'x'
        note_index_of_root_note = (note_index_of_root_note - 5) % 12
      else
        input_to_show = input_key
      end

      root_note = NOTES[:sharp][note_index_of_root_note]
      chord = chords[input_to_show]
      scale = chord && chord[:scale] || full_scale
      note_name = NOTES[:sharp][(scale[0] + note_index_of_root_note) % 12]
      flat_or_sharp = SHARP_FLAT_MAP[note_name]
      note_name_human = NOTES[flat_or_sharp][(scale[0] + note_index_of_root_note) % 12]
      root_note_human = NOTES[flat_or_sharp][note_index_of_root_note]
      label = chord && "#{note_name_human}#{chord[:label]}" || "#{root_note_human} major"
      refresh
      STRINGS.reverse.each_with_index do |s, index|
        setpos(index,0)
        addstr(show_string(s, root_note:, scale:, flat_or_sharp:))
      end
      setpos(6,0)
      if chords.keys.include?(input_to_show)
        chord_num = ['a', 's', 'd', 'f', 'g', 'h', 'j', 'q', 'w', 'e', 'r', 't', 'y', 'u', '1', '2', '3'].index(input_to_show) % 7 + 1
        roman = ROMAN[chord_num]
        addstr("Chord: #{label} (#{roman}#{chord[:label]})#{" " * 40}")
      else
        addstr("Scale: #{label}#{" " * 40}")
      end
      setpos(7,0)
      addstr("Key: #{root_note_human}   ")
      setpos(8,0)
      input_key = getch
    end
  ensure
    close_screen
  end
end

#show_string(string_note, root_note:, scale:, flat_or_sharp: :sharp) ⇒ Object 



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# File 'lib/fret_viewer/do_something.rb', line 52

def show_string(string_note, root_note:, scale:, flat_or_sharp: :sharp)
  # result = "#{note_on_string(string_note)}-||"
  result = ""
  note_index_of_string_note = NOTES[:sharp].index string_note
  note_index_of_root_note = NOTES[:sharp].index root_note
  (0..12).each_with_index do |fret, index|
    fret_end = index.zero? ? '||' : '-|'
    index_of_note_on_this_fret = (note_index_of_string_note + fret) % 12
    if scale.include?((index_of_note_on_this_fret - note_index_of_root_note) % 12)
      result += "-#{note_on_string(NOTES[flat_or_sharp][index_of_note_on_this_fret])}#{fret_end}"
    else
      result += "---#{fret_end}"
    end
  end
  result
end