text: " Copyright (c) 2012, Matthew J. Wozniski
  " All rights reserved.
  "
  " Redistribution and use in source and binary forms, with or without
  " modification, are permitted provided that the following conditions are met:
  "     * Redistributions of source code must retain the above copyright
  "       notice, this list of conditions and the following disclaimer.
  "     * Redistributions in binary form must reproduce the above copyright
  "       notice, this list of conditions and the following disclaimer in the
  "       documentation and/or other materials provided with the distribution.
  "     * The names of the contributors may not be used to endorse or promote
  "       products derived from this software without specific prior written
  "       permission.
  "
  " THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``AS IS'' AND ANY
  " EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  " WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  " DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
  " DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  " (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  " LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  " ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  " (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  " SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  let s:xterm_colors   = [ 0x00, 0x5F, 0x87, 0xAF, 0xD7, 0xFF ]
  let s:eterm_colors   = [ 0x00, 0x2A, 0x55, 0x7F, 0xAA, 0xD4 ]
  let s:konsole_colors = [ 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF ]
  let s:xterm_greys    = [ 0x08, 0x12, 0x1C, 0x26, 0x30, 0x3A,
                         \ 0x44, 0x4E, 0x58, 0x62, 0x6C, 0x76,
                         \ 0x80, 0x8A, 0x94, 0x9E, 0xA8, 0xB2,
                         \ 0xBC, 0xC6, 0xD0, 0xDA, 0xE4, 0xEE ]
  
  let s:urxvt_colors   = [ 0x00, 0x8B, 0xCD, 0xFF ]
  let s:urxvt_greys    = [ 0x2E, 0x5C, 0x73, 0x8B,
                         \ 0xA2, 0xB9, 0xD0, 0xE7 ]
  
  " Uses &term to determine which cube should be use.  If &term is set to
  " "xterm" or begins with "screen", the variables g:CSApprox_eterm and
  " g:CSApprox_konsole can be used to select a different palette.
  function! csapprox#common#PaletteType()
    if &t_Co == 88
      let type = 'urxvt'
    elseif &term ==# 'xterm' || &term =~# '^screen' || &term==# 'builtin_gui'
      if exists('g:CSApprox_konsole') && g:CSApprox_konsole
        let type = 'konsole'
      elseif exists('g:CSApprox_eterm') && g:CSApprox_eterm
        let type = 'eterm'
      else
        let type = 'xterm'
      endif
    elseif &term =~? '^konsole'
      " Konsole only used its own palette up til KDE 4.2.0
      if executable('kde4-config') && system('kde4-config --kde-version') =~ '^4\.[10]\.'
        let type = 'konsole'
      elseif executable('kde-config') && system('kde-config --version') =~# 'KDE: 3\.'
        let type = 'konsole'
      else
        let type = 'xterm'
      endif
    elseif &term =~? '^eterm'
      let type = 'eterm'
    else
      let type = 'xterm'
    endif
  
    return type
  endfunction
  
  " Retrieve the list of greyscale ramp colors for the current palette
  function! csapprox#common#Greys()
    return (&t_Co == 88 ? s:urxvt_greys : s:xterm_greys)
  endfunction
  
  " Retrieve the list of non-greyscale ramp colors for the current palette
  function! csapprox#common#Colors()
    return s:{csapprox#common#PaletteType()}_colors
  endfunction
  