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/* Inspired by https://github.com/xuyu/logging/blob/master/colorful_win.go */
package ethrepl
import (
"syscall"
"unsafe"
)
type color uint16
const (
green = color(0x0002)
red = color(0x0004)
yellow = color(0x000E)
)
const (
mask = uint16(yellow | green | red)
)
var (
kernel32 = syscall.NewLazyDLL("kernel32.dll")
procGetStdHandle = kernel32.NewProc("GetStdHandle")
procSetConsoleTextAttribute = kernel32.NewProc("SetConsoleTextAttribute")
procGetConsoleScreenBufferInfo = kernel32.NewProc("GetConsoleScreenBufferInfo")
hStdout uintptr
initScreenInfo *consoleScreenBufferInfo
)
func setConsoleTextAttribute(hConsoleOutput uintptr, wAttributes uint16) bool {
ret, _, _ := procSetConsoleTextAttribute.Call(hConsoleOutput, uintptr(wAttributes))
return ret != 0
}
type coord struct {
X, Y int16
}
type smallRect struct {
Left, Top, Right, Bottom int16
}
type consoleScreenBufferInfo struct {
DwSize coord
DwCursorPosition coord
WAttributes uint16
SrWindow smallRect
DwMaximumWindowSize coord
}
func getConsoleScreenBufferInfo(hConsoleOutput uintptr) *consoleScreenBufferInfo {
var csbi consoleScreenBufferInfo
ret, _, _ := procGetConsoleScreenBufferInfo.Call(hConsoleOutput, uintptr(unsafe.Pointer(&csbi)))
if ret == 0 {
return nil
}
return &csbi
}
const (
stdOutputHandle = uint32(-11 & 0xFFFFFFFF)
)
func init() {
hStdout, _, _ = procGetStdHandle.Call(uintptr(stdOutputHandle))
initScreenInfo = getConsoleScreenBufferInfo(hStdout)
}
func resetColorful() {
if initScreenInfo == nil {
return
}
setConsoleTextAttribute(hStdout, initScreenInfo.WAttributes)
}
func changeColor(c color) {
attr := uint16(0) & ^mask | uint16(c)
setConsoleTextAttribute(hStdout, attr)
}
|
