128 lines
3.5 KiB
V
128 lines
3.5 KiB
V
module term
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import os
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[typedef]
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pub struct C.COORD {
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mut:
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X i16
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Y i16
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}
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[typedef]
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pub struct C.SMALL_RECT {
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mut:
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Left u16
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Top u16
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Right u16
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Bottom u16
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}
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// win: CONSOLE_SCREEN_BUFFER_INFO
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// https://docs.microsoft.com/en-us/windows/console/console-screen-buffer-info-str
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[typedef]
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pub struct C.CONSOLE_SCREEN_BUFFER_INFO {
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mut:
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dwSize C.COORD
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dwCursorPosition C.COORD
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wAttributes u16
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srWindow C.SMALL_RECT
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dwMaximumWindowSize C.COORD
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}
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pub union C.uChar {
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mut:
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UnicodeChar rune
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AsciiChar u8
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}
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[typedef]
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pub struct C.CHAR_INFO {
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mut:
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Char C.uChar
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Attributes u16
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}
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// ref - https://docs.microsoft.com/en-us/windows/console/getconsolescreenbufferinfo
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fn C.GetConsoleScreenBufferInfo(handle C.HANDLE, info &C.CONSOLE_SCREEN_BUFFER_INFO) bool
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// ref - https://docs.microsoft.com/en-us/windows/console/setconsoletitle
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fn C.SetConsoleTitle(title &u16) bool
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// ref - https://docs.microsoft.com/en-us/windows/console/setconsolecursorposition
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fn C.SetConsoleCursorPosition(handle C.HANDLE, coord C.COORD) bool
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// ref - https://docs.microsoft.com/en-us/windows/console/scrollconsolescreenbuffer
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fn C.ScrollConsoleScreenBuffer(output C.HANDLE, scroll_rect &C.SMALL_RECT, clip_rect &C.SMALL_RECT, des C.COORD, fill &C.CHAR_INFO) bool
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// get_terminal_size returns a number of colums and rows of terminal window.
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pub fn get_terminal_size() (int, int) {
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if os.is_atty(1) > 0 && os.getenv('TERM') != 'dumb' {
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info := C.CONSOLE_SCREEN_BUFFER_INFO{}
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if C.GetConsoleScreenBufferInfo(C.GetStdHandle(C.STD_OUTPUT_HANDLE), &info) {
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columns := int(info.srWindow.Right - info.srWindow.Left + 1)
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rows := int(info.srWindow.Bottom - info.srWindow.Top + 1)
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return columns, rows
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}
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}
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return default_columns_size, default_rows_size
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}
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// get_cursor_position returns a Coord containing the current cursor position
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pub fn get_cursor_position() ?Coord {
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mut res := Coord{}
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if os.is_atty(1) > 0 && os.getenv('TERM') != 'dumb' {
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info := C.CONSOLE_SCREEN_BUFFER_INFO{}
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if C.GetConsoleScreenBufferInfo(C.GetStdHandle(C.STD_OUTPUT_HANDLE), &info) {
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res.x = info.dwCursorPosition.X
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res.y = info.dwCursorPosition.Y
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} else {
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return os.last_error()
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}
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}
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return res
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}
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// set_terminal_title change the terminal title
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pub fn set_terminal_title(title string) bool {
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title_change := C.SetConsoleTitle(title.to_wide())
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return title_change
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}
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// clear clears current terminal screen.
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// Implementation taken from https://docs.microsoft.com/en-us/windows/console/clearing-the-screen#example-2.
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pub fn clear() {
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hconsole := C.GetStdHandle(C.STD_OUTPUT_HANDLE)
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mut csbi := C.CONSOLE_SCREEN_BUFFER_INFO{}
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mut scrollrect := C.SMALL_RECT{}
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mut scrolltarget := C.COORD{}
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mut fill := C.CHAR_INFO{}
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// Get the number of character cells in the current buffer.
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if !C.GetConsoleScreenBufferInfo(hconsole, &csbi) {
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return
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}
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// Scroll the rectangle of the entire buffer.
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scrollrect.Left = 0
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scrollrect.Top = 0
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scrollrect.Right = u16(csbi.dwSize.X)
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scrollrect.Bottom = u16(csbi.dwSize.Y)
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// Scroll it upwards off the top of the buffer with a magnitude of the entire height.
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scrolltarget.X = 0
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scrolltarget.Y = (0 - csbi.dwSize.Y)
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// Fill with empty spaces with the buffer's default text attribute.
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fill.Char.UnicodeChar = rune(` `)
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fill.Attributes = csbi.wAttributes
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// Do the scroll
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C.ScrollConsoleScreenBuffer(hconsole, &scrollrect, C.NULL, scrolltarget, &fill)
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// Move the cursor to the top left corner too.
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csbi.dwCursorPosition.X = 0
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csbi.dwCursorPosition.Y = 0
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C.SetConsoleCursorPosition(hconsole, csbi.dwCursorPosition)
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}
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