PARTY OR DIE - Activate by ` :so https://git.io/JO5NW `

partycursor.vim

vim9script

var hue: number = 0

def Update(timer: number)
  hue += 64
  hue %= 1536
  var r: number = abs(hue - 768) - 256
  var g: number = abs(Mod((hue - 512), 1536) - 768) - 256
  var b: number = abs(Mod((hue - 1024), 1536) - 768) - 256
  r = max([min([r, 255]), 0]) / 2 + 128
  g = max([min([g, 255]), 0]) / 2 + 128
  b = max([min([b, 255]), 0]) / 2 + 128
  hlset([{name: 'Cursor', guifg: '#000000', guibg: printf("#%02x%02x%02x", r, g, b)}])
enddef

def Mod(a: number, b: number): number
  if a >= 0
    return a % b
  endif
  return a % b + b
enddef

if !g:->get('partycursor_timer')
  g:partycursor_timer = timer_start(15, Update, {repeat: -1})
endif

:set guicursor+=n-v-c:blinkon0