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package liner
import (
"unsafe"
)
type coord struct {
x, y int16
}
type smallRect struct {
left, top, right, bottom int16
}
type consoleScreenBufferInfo struct {
dwSize coord
dwCursorPosition coord
wAttributes int16
srWindow smallRect
dwMaximumWindowSize coord
}
func (s *State) cursorPos(x int) {
var sbi consoleScreenBufferInfo
procGetConsoleScreenBufferInfo.Call(uintptr(s.hOut), uintptr(unsafe.Pointer(&sbi)))
procSetConsoleCursorPosition.Call(uintptr(s.hOut),
uintptr(int(x)&0xFFFF|int(sbi.dwCursorPosition.y)<<16))
}
func (s *State) eraseLine() {
var sbi consoleScreenBufferInfo
procGetConsoleScreenBufferInfo.Call(uintptr(s.hOut), uintptr(unsafe.Pointer(&sbi)))
var numWritten uint32
procFillConsoleOutputCharacter.Call(uintptr(s.hOut), uintptr(' '),
uintptr(sbi.dwSize.x-sbi.dwCursorPosition.x),
uintptr(int(sbi.dwCursorPosition.x)&0xFFFF|int(sbi.dwCursorPosition.y)<<16),
uintptr(unsafe.Pointer(&numWritten)))
}
func (s *State) eraseScreen() {
var sbi consoleScreenBufferInfo
procGetConsoleScreenBufferInfo.Call(uintptr(s.hOut), uintptr(unsafe.Pointer(&sbi)))
var numWritten uint32
procFillConsoleOutputCharacter.Call(uintptr(s.hOut), uintptr(' '),
uintptr(sbi.dwSize.x)*uintptr(sbi.dwSize.y),
0,
uintptr(unsafe.Pointer(&numWritten)))
procSetConsoleCursorPosition.Call(uintptr(s.hOut), 0)
}
func (s *State) moveUp(lines int) {
var sbi consoleScreenBufferInfo
procGetConsoleScreenBufferInfo.Call(uintptr(s.hOut), uintptr(unsafe.Pointer(&sbi)))
procSetConsoleCursorPosition.Call(uintptr(s.hOut),
uintptr(int(sbi.dwCursorPosition.x)&0xFFFF|(int(sbi.dwCursorPosition.y)-lines)<<16))
}
func (s *State) moveDown(lines int) {
var sbi consoleScreenBufferInfo
procGetConsoleScreenBufferInfo.Call(uintptr(s.hOut), uintptr(unsafe.Pointer(&sbi)))
procSetConsoleCursorPosition.Call(uintptr(s.hOut),
uintptr(int(sbi.dwCursorPosition.x)&0xFFFF|(int(sbi.dwCursorPosition.y)+lines)<<16))
}
func (s *State) emitNewLine() {
// windows doesn't need to omit a new line
}
func (s *State) getColumns() {
var sbi consoleScreenBufferInfo
procGetConsoleScreenBufferInfo.Call(uintptr(s.hOut), uintptr(unsafe.Pointer(&sbi)))
s.columns = int(sbi.dwSize.x)
if s.columns > 1 {
// Windows 10 needs a spare column for the cursor
s.columns--
}
}
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