cfillion_Compare tracks 1 and 2 for 20 seconds.lua

-- https://forum.cockos.com/showthread.php?t=200086

function solo(trackIndex)
  local track = reaper.GetTrack(0, trackIndex)
  if not track then return false end

  reaper.PreventUIRefresh(1)
  reaper.SoloAllTracks(0)

  reaper.SetMediaTrackInfo_Value(track, 'I_SOLO', 1)
  reaper.CSurf_GoStart()
  reaper.OnPlayButton()

  reaper.PreventUIRefresh(-1)
  
  return true
end

function wait(delay, callback)
  local start = reaper.time_precise()
  
  gfx.init("", 300, 40, 0, 0, 0)
  gfx.r, gfx.g, gfx.b = 5/255, 46/255, 109/255
  gfx.clear = 0xffffff

  function loop()
    if gfx.getchar() < 0 then
      return
    end

    local elapsed = reaper.time_precise() - start
    local remaining = math.ceil(delay - elapsed)
    local progress = elapsed / delay

    local unit = 'second'
    if remaining ~= 1 then unit = 'seconds' end

    gfx.init(string.format("Waiting %d %s...", remaining, unit))
    gfx.rect(10, 10, (gfx.w - 20) * progress, gfx.h - 20)
    gfx.update()
  
    if elapsed < delay then
      reaper.defer(loop)
    else
      gfx.quit()
      callback()
    end
  end
  
  loop()
end

solo(0)
wait(20, function() solo(1) end)