switch_colors.vim

nmap <leader>bb :call <SID>SwitchColors('andrew', 'default')<cr>:echo "Colorscheme: ".g:colors_name<cr>

let s:previous_colorscheme = g:colors_name

function! s:SwitchColors(...)
  let colorscheme_list = a:000
  let previous_colorscheme_index = index(colorscheme_list, s:previous_colorscheme)

  if previous_colorscheme_index < 0
    " not found, just use the first one
    let s:previous_colorscheme = colorscheme_list[0]
    exe 'colo '.colorscheme_list[0]
    return
  endif

  let next_colorscheme_index = float2nr(fmod(previous_colorscheme_index + 1, len(colorscheme_list)))
  let s:previous_colorscheme = colorscheme_list[next_colorscheme_index]
  exe 'colo '.colorscheme_list[next_colorscheme_index]
  return
endfunction