windows colors

gistfile1.rb

require 'Win32API'

SetConsoleTextAttribute    = Win32API.new('kernel32', 'SetConsoleTextAttribute', 'LL', 'I')
GetConsoleScreenBufferInfo = Win32API.new('kernel32', 'GetConsoleScreenBufferInfo', 'LP', 'I')
GetStdHandle               = Win32API.new('kernel32', 'GetStdHandle', 'L', 'L')

def SetConsoleTextAttribute(attribute)
  SetConsoleTextAttribute.call(@handle, attribute) != 0
end

def GetStdHandle(std_handle)
  GetStdHandle.call(std_handle)
end

def GetConsoleScreenBufferInfo(buf_info)
  GetConsoleScreenBufferInfo.call(@handle, buf_info) != 0
end

STD_INPUT_HANDLE  = -10
STD_OUTPUT_HANDLE = -11
STD_ERROR_HANDLE  = -12

RESET                      = 0x0000
FOREGROUND_BLUE            = 0x0001
FOREGROUND_GREEN           = 0x0002
FOREGROUND_RED             = 0x0004
FOREGROUND_INTENSITY       = 0x0008
BACKGROUND_BLUE            = 0x0010
BACKGROUND_GREEN           = 0x0020
BACKGROUND_RED             = 0x0040
BACKGROUND_INTENSITY       = 0x0080

@handle = GetStdHandle(STD_OUTPUT_HANDLE)
lpBuffer = ' ' * 22
GetConsoleScreenBufferInfo(lpBuffer)
info = lpBuffer.unpack('SSSSSssssSS')
# Get existing console attributes
@color_attributes = info[4]

def purple(text)
  SetConsoleTextAttribute(FOREGROUND_BLUE|FOREGROUND_RED)
  print text
  reset
end

def blue(text)
  SetConsoleTextAttribute(FOREGROUND_BLUE)
  print text
  reset
end

def reset
  SetConsoleTextAttribute(@color_attributes)
end

purple("foo")
blue("bar\n")