" MIT License. Copyright (c) 2013-2021 Bailey Ling Christian Brabandt et al.
" vim: et ts=2 sts=2 sw=2

scriptencoding utf-8

" basic 16 msdos from MSDOS
" see output of color, should be
"     0    Black
"     1    DarkBlue
"     2    DarkGreen
"     3    DarkCyan
"     4    DarkRed
"     5    DarkMagenta
"     6    Brown
"     7    LightGray
"     8    DarkGray
"     9    Blue
"     10   Green
"     11   Cyan
"     12   Red
"     13   Magenta
"     14   Yellow
"     15   White

let s:basic16 = [
  \ [ 0x00, 0x00, 0x00 ],
  \ [ 0x00, 0x00, 0x80 ],
  \ [ 0x00, 0x80, 0x00 ],
  \ [ 0x00, 0x80, 0x80 ],
  \ [ 0x80, 0x00, 0x00 ],
  \ [ 0x80, 0x00, 0x80 ],
  \ [ 0x80, 0x80, 0x00 ],
  \ [ 0xC0, 0xC0, 0xC0 ],
  \ [ 0x80, 0x80, 0x80 ],
  \ [ 0x00, 0x00, 0xFF ],
  \ [ 0x00, 0xFF, 0x00 ],
  \ [ 0x00, 0xFF, 0xFF ],
  \ [ 0xFF, 0x00, 0x00 ],
  \ [ 0xFF, 0x00, 0xFF ],
  \ [ 0xFF, 0xFF, 0x00 ],
  \ [ 0xFF, 0xFF, 0xFF ]
  \ ]

function! airline#msdos#round_msdos_colors(rgblist)
  " Check for values from MSDOS 16 color terminal
  let best = []
  let min  = 100000
  let list = s:basic16
  for value in list
    let t = abs(value[0] - a:rgblist[0]) +
          \ abs(value[1] - a:rgblist[1]) +
          \ abs(value[2] - a:rgblist[2])
    if min > t
      let min = t
      let best = value
    endif
  endfor
  return index(s:basic16, best)
endfunction