vim-airline/autoload/airline/themes.vim

" MIT License. Copyright (c) 2013 Bailey Ling.
" vim: et ts=2 sts=2 sw=2

" generates a dictionary which defines the colors for each highlight group
function! airline#themes#generate_color_map(sect1, sect2, sect3, ...)
  let palette = {
        \ 'airline_a': [ a:sect1[0] , a:sect1[1] , a:sect1[2] , a:sect1[3] , get(a:sect1 , 4 , 'bold') ] ,
        \ 'airline_b': [ a:sect2[0] , a:sect2[1] , a:sect2[2] , a:sect2[3] , get(a:sect2 , 4 , ''    ) ] ,
        \ 'airline_c': [ a:sect3[0] , a:sect3[1] , a:sect3[2] , a:sect3[3] , get(a:sect3 , 4 , ''    ) ] ,
        \ }

  if a:0 > 0
    call extend(palette, {
          \ 'airline_x': [ a:1[0] , a:1[1] , a:1[2] , a:1[3] , get(a:1 , 4 , '' ) ] ,
          \ 'airline_y': [ a:2[0] , a:2[1] , a:2[2] , a:2[3] , get(a:2 , 4 , '' ) ] ,
          \ 'airline_z': [ a:3[0] , a:3[1] , a:3[2] , a:3[3] , get(a:3 , 4 , '' ) ] ,
          \ })
  else
    call extend(palette, {
          \ 'airline_x': [ a:sect3[0] , a:sect3[1] , a:sect3[2] , a:sect3[3] , get(a:sect3 , 4 , '' ) ] ,
          \ 'airline_y': [ a:sect2[0] , a:sect2[1] , a:sect2[2] , a:sect2[3] , get(a:sect2 , 4 , '' ) ] ,
          \ 'airline_z': [ a:sect1[0] , a:sect1[1] , a:sect1[2] , a:sect1[3] , get(a:sect1 , 4 , '' ) ] ,
          \ })
  endif

  return palette
endfunction

function! airline#themes#get_highlight(group, ...)
  return call('airline#highlighter#get_highlight', [a:group] + a:000)
endfunction

function! airline#themes#get_highlight2(fg, bg, ...)
  return call('airline#highlighter#get_highlight2', [a:fg, a:bg] + a:000)
endfunction

function! airline#themes#patch(palette)
  for mode in keys(a:palette)
    if !has_key(a:palette[mode], 'airline_warning')
      let a:palette[mode]['airline_warning'] = [ '#000000', '#df5f00', 232, 166 ]
    endif
  endfor

  " this is a pretty heavy handed, but it works...
  " basically, look for the 'airline_file' group and copy the bg
  " colors from 'airline_c' into it.
  for mode in keys(a:palette)
    let overrides = split(mode, '_')
    let mode_colors = a:palette[overrides[0]]
    if exists('mode_colors.airline_file')
      let file_colors = mode_colors.airline_file
      let file_colors[1] = mode_colors.airline_c[1]
      let file_colors[3] = mode_colors.airline_c[3]

      if len(overrides) > 1
        let override_colors = a:palette[overrides[0].'_'.overrides[1]]
        let override_colors.airline_file = copy(file_colors)
        let override_status_colors = get(override_colors, 'airline_c', mode_colors.airline_c)
        let override_colors.airline_file[1] = override_status_colors[1]
        let override_colors.airline_file[3] = override_status_colors[3]
      endif
    endif
  endfor
endfunction