whistletype.rb

# demo: https://www.youtube.com/watch?v=MZ3M0ePA5U4&feature=youtu.be
# this depends on the imitone software to convert whistling into midi

require "rtmidi"

midiin = RtMidi::In.new

MATCHERS = {
  [0..2, 3..5] => "Page_Up",
  [3..5, 0..2] => "Page_Down",
  [0..2, 3..5, 6..9] => "Up",
  [6..9, 3..5, 0..2] => "Down"
}

def match_buffer b
  b = b.map { |n| n - b.min }
  MATCHERS.to_a.select { |m| m[0].size == b.size }.each do |matcher, cmd|
    next if matcher.zip(b).find { |r,n| !r.include? n}
    `DISPLAY=':0' xdotool key #{cmd}`
  end
end

last_note = 0
buffer = []

Thread.new do 
  loop do
    sleep 0.1 
    if !buffer.empty? && (Time.now.to_f - last_note) > 1
      match_buffer(buffer) 
      buffer = []
    end 
  end
end

midiin.receive_channel_message do |byte1, byte2, byte3|
  buffer << byte2 if byte1 == 144 && (buffer.empty? || (buffer.last - byte2).abs > 2)
  last_note = Time.now.to_f
end

midiin.open_port(0)

sleep