DoxigAlpha
std › Progress.windowsApiMoveToMarker

windowsApiMoveToMarker

Function parameters

Parameters

#
nl_n:usize

Type definitions in this namespace

Types

#
Node
Represents one unit of progress.

Initializes a global Progress instance.

Functions

#
start
Initializes a global Progress instance.
lockStdErr
Allows the caller to freely write to stderr until `unlockStdErr` is called.
lockStderrWriter
Allows the caller to freely write to the returned `Writer`,

= switch (builtin.os.tag) { .wasi, .freestanding, .windows => false, else => true, }

Values

#
have_ipc
= switch (builtin.os.tag) { .wasi, .freestanding, .windows => false, else => true, }

Source

Implementation

#
fn windowsApiMoveToMarker(nl_n: usize) error{Unexpected}!void {
    const handle = global_progress.terminal.handle;
    var console_info: windows.CONSOLE_SCREEN_BUFFER_INFO = undefined;
    if (windows.kernel32.GetConsoleScreenBufferInfo(handle, &console_info) == 0) {
        return error.Unexpected;
    }
    const cursor_pos = console_info.dwCursorPosition;
    const expected_y = cursor_pos.Y - @as(i16, @intCast(nl_n));
    var start_pos: windows.COORD = .{ .X = 0, .Y = expected_y };
    while (start_pos.Y >= 0) {
        var wchar: [1]u16 = undefined;
        var num_console_chars_read: windows.DWORD = undefined;
        if (windows.kernel32.ReadConsoleOutputCharacterW(handle, &wchar, wchar.len, start_pos, &num_console_chars_read) == 0) {
            return error.Unexpected;
        }

        if (wchar[0] == windows_api_start_marker) break;
        start_pos.Y -= 1;
    } else {
        // If we couldn't find the marker, then just assume that no lines wrapped
        start_pos = .{ .X = 0, .Y = expected_y };
    }
    if (windows.kernel32.SetConsoleCursorPosition(handle, start_pos) == 0) {
        return error.Unexpected;
    }
}