export def powerline [
  bg: string
  elem: list<any>
  --separator = ''
  --start = ''
  --end = ''
] {
  if ($elem | is-empty) {
    return
  }
  let first = ($elem | first)
  let last = ($elem | last)

  ($elem 
    | window 2
    | each {|it| 
      $"(ansi {fg: $it.0.fg, bg: $it.0.bg})($it.0.icon? | default '') ($it.0.text? | default '')(ansi {fg: $it.0.bg, bg: $it.1.bg})($separator)"
    }
    | append $"(ansi {fg: $last.fg, bg: $last.bg})($last.icon? | default '') ($last.text? | default '')(ansi {fg: $last.bg, bg: $bg})($end)(ansi reset)"
    | prepend $"(ansi {fg: $bg, bg: $first.bg})($start)"
    | str join ""
  )
}