/**
 * Canonical terminal sequences for xterm.js / VT100-style hosts (Pear stdio, SSH PTY).
 * Keep {@link XTERM_CLEAR_SCROLLBACK_AND_VIEWPORT} in sync with
 * `packages/bare-os-coreutils/src/clear.js` (kernel /bin scripts cannot import this module).
 */

/** SGR reset */
export const SGR_RESET = '\x1b[0m'

/** Cursor to home (1,1) */
export const CURSOR_HOME = '\x1b[H'

/** Erase saved lines (scrollback) then full display — xterm.js honors CSI 3 J */
export const CSI_ERASE_SCROLLBACK = '\x1b[3J'

/** Erase entire display (viewport) */
export const CSI_ERASE_DISPLAY = '\x1b[2J'

/**
 * Clear scrollback and visible screen, home cursor, reset attributes.
 * Order: home first so erase targets a stable origin; 3J then 2J matches common xterm expectations.
 */
export const XTERM_CLEAR_SCROLLBACK_AND_VIEWPORT =
  CURSOR_HOME + CSI_ERASE_SCROLLBACK + CSI_ERASE_DISPLAY + SGR_RESET