module term import os [typedef] struct C.COORD { mut: X i16 Y i16 } [typedef] struct C.SMALL_RECT { mut: Left u16 Top u16 Right u16 Bottom u16 } // win: CONSOLE_SCREEN_BUFFER_INFO // https://docs.microsoft.com/en-us/windows/console/console-screen-buffer-info-str [typedef] struct C.CONSOLE_SCREEN_BUFFER_INFO { mut: dwSize C.COORD dwCursorPosition C.COORD wAttributes u16 srWindow C.SMALL_RECT dwMaximumWindowSize C.COORD } union C.uChar { mut: UnicodeChar rune AsciiChar byte } [typedef] struct C.CHAR_INFO { mut: Char C.uChar Attributes u16 } // ref - https://docs.microsoft.com/en-us/windows/console/getconsolescreenbufferinfo fn C.GetConsoleScreenBufferInfo(handle C.HANDLE, info &C.CONSOLE_SCREEN_BUFFER_INFO) bool // ref - https://docs.microsoft.com/en-us/windows/console/setconsoletitle fn C.SetConsoleTitle(title &u16) bool // ref - https://docs.microsoft.com/en-us/windows/console/setconsolecursorposition fn C.SetConsoleCursorPosition(handle C.HANDLE, coord C.COORD) bool // ref - https://docs.microsoft.com/en-us/windows/console/scrollconsolescreenbuffer fn C.ScrollConsoleScreenBuffer(output C.HANDLE, scroll_rect &C.SMALL_RECT, clip_rect &C.SMALL_RECT, des C.COORD, fill &C.CHAR_INFO) bool // get_terminal_size returns a number of colums and rows of terminal window. pub fn get_terminal_size() (int, int) { if os.is_atty(1) > 0 && os.getenv('TERM') != 'dumb' { info := C.CONSOLE_SCREEN_BUFFER_INFO{} if C.GetConsoleScreenBufferInfo(C.GetStdHandle(C.STD_OUTPUT_HANDLE), &info) { columns := int(info.srWindow.Right - info.srWindow.Left + 1) rows := int(info.srWindow.Bottom - info.srWindow.Top + 1) return columns, rows } } return default_columns_size, default_rows_size } // get_cursor_position returns a Coord containing the current cursor position pub fn get_cursor_position() Coord { mut res := Coord{} if os.is_atty(1) > 0 && os.getenv('TERM') != 'dumb' { info := C.CONSOLE_SCREEN_BUFFER_INFO{} if C.GetConsoleScreenBufferInfo(C.GetStdHandle(C.STD_OUTPUT_HANDLE), &info) { res.x = info.dwCursorPosition.X res.y = info.dwCursorPosition.Y } } return res } // set_terminal_title change the terminal title pub fn set_terminal_title(title string) bool { title_change := C.SetConsoleTitle(title.to_wide()) return title_change } // clear clears current terminal screen. // Implementation taken from https://docs.microsoft.com/en-us/windows/console/clearing-the-screen#example-2. pub fn clear() { hconsole := C.GetStdHandle(C.STD_OUTPUT_HANDLE) mut csbi := C.CONSOLE_SCREEN_BUFFER_INFO{} mut scrollrect := C.SMALL_RECT{} mut scrolltarget := C.COORD{} mut fill := C.CHAR_INFO{} // Get the number of character cells in the current buffer. if !C.GetConsoleScreenBufferInfo(hconsole, &csbi) { return } // Scroll the rectangle of the entire buffer. scrollrect.Left = 0 scrollrect.Top = 0 scrollrect.Right = u16(csbi.dwSize.X) scrollrect.Bottom = u16(csbi.dwSize.Y) // Scroll it upwards off the top of the buffer with a magnitude of the entire height. scrolltarget.X = 0 scrolltarget.Y = (0 - csbi.dwSize.Y) // Fill with empty spaces with the buffer's default text attribute. fill.Char.UnicodeChar = rune(` `) fill.Attributes = csbi.wAttributes // Do the scroll C.ScrollConsoleScreenBuffer(hconsole, &scrollrect, C.NULL, scrolltarget, &fill) // Move the cursor to the top left corner too. csbi.dwCursorPosition.X = 0 csbi.dwCursorPosition.Y = 0 C.SetConsoleCursorPosition(hconsole, csbi.dwCursorPosition) }