256colors.lua

-- Displays xterm 256 color palette

bright_fg, dark_fg = 47, 40

function print_section_title(text)
   local width = 42
   local title = " " .. text .. " "
   local tile  = "\226\148\129"
   print( "\027[7m" .. title .. "\027[m" .. string.rep(tile, (width - #title)) )
end

print_section_title("SYSTEM")

for color = 0, 15 do
   if (color % 6) == 0 then io.stdout:write("\n") end
   io.stdout:write(string.format(
      "\027[38;5;%u;7m\027[%um  %03u  \027[m",
      color,
      ((color == 0 or color == 4) and bright_fg or dark_fg),
      color))
end

print("\n")
print_section_title("CUBE")
print("")

for red = 0, 5 do
   for green = 0, 5 do
      for blue = 0, 5 do
         color = 16 + (red * 36) + (green * 6) + blue
         io.stdout:write(string.format(
            "\027[38;5;%u;7m\027[%um  %03u  \027[m",
            color,
            (green == 0 and bright_fg or dark_fg),
            color))
      end
      print("")
   end
end

print("")
print_section_title("GRAYSCALE")

i = 0
for color = 232, 255 do
   if i == 0 then print("") end
   io.stdout:write(string.format(
      "\027[38;5;%u;7m\027[%um  %03u  \027[m",
      color,
      (color < 238 and bright_fg or dark_fg),
      color))
   i = (i + 1) % 6
end

print("\n")