ghostty/src/terminal/cursor.zig

/// The visual style of the cursor. Whether or not it blinks
/// is determined by mode 12 (modes.zig). This mode is synchronized
/// with CSI q, the same as xterm.
pub const Style = enum {
    bar, // DECSCUSR 5, 6
    block, // DECSCUSR 1, 2
    underline, // DECSCUSR 3, 4

    /// The cursor styles below aren't known by DESCUSR and are custom
    /// implemented in Ghostty. They are reported as some standard style
    /// if requested, though.
    /// Hollow block cursor. This is a block cursor with the center empty.
    /// Reported as DECSCUSR 1 or 2 (block).
    block_hollow,
};