63 lines
2.2 KiB
Go
63 lines
2.2 KiB
Go
// Package vt wraps a headless virtual terminal emulator behind a small
|
|
// Go interface. The intent is that all cgo to libghostty-vt is confined
|
|
// to the GhosttyEmulator implementation in this package.
|
|
package vt
|
|
|
|
// Screen identifies which buffer is currently displayed.
|
|
type Screen uint8
|
|
|
|
const (
|
|
ScreenPrimary Screen = iota
|
|
ScreenAlternate
|
|
)
|
|
|
|
// CursorState is a snapshot of cursor position and visibility.
|
|
type CursorState struct {
|
|
Col, Row uint16
|
|
Visible bool
|
|
}
|
|
|
|
// Emulator is the headless VT used by the daemon (and by the milestone-1 spike).
|
|
//
|
|
// Implementations are not required to be safe for concurrent use. The spike
|
|
// CLI funnels all calls through a single goroutine.
|
|
type Emulator interface {
|
|
// Write feeds bytes from the PTY master into the emulator. It returns
|
|
// the number of bytes consumed (always len(p) on success).
|
|
Write(p []byte) (int, error)
|
|
|
|
// Resize updates the emulator's cell grid. The caller is responsible
|
|
// for issuing TIOCSWINSZ on the PTY itself.
|
|
Resize(cols, rows uint16) error
|
|
|
|
// PlainText returns the active screen rendered as plain text, with
|
|
// soft-wrapped lines unwrapped and trailing whitespace trimmed.
|
|
PlainText() (string, error)
|
|
|
|
// ScreenText returns the active screen as fixed screen rows. Unlike
|
|
// PlainText, this preserves row boundaries so a host UI can repaint
|
|
// into a clipped viewport.
|
|
ScreenText() (string, error)
|
|
|
|
// SerializeVT returns the active screen as a VT byte sequence that, when
|
|
// written to a fresh terminal, reproduces the visible state (colours,
|
|
// styles, cursor, hyperlinks, etc.). Used as the daemon's "catch-up
|
|
// frame" for newly-attached clients.
|
|
SerializeVT() ([]byte, error)
|
|
|
|
// Cursor returns cursor position and visibility on the active screen.
|
|
Cursor() (CursorState, error)
|
|
|
|
// ActiveScreen reports whether we are on the primary or alternate buffer.
|
|
ActiveScreen() (Screen, error)
|
|
|
|
// OnWritePTY registers a callback that fires when the emulator wants
|
|
// to write bytes back to the PTY master (e.g. responses to DA / DSR
|
|
// queries). The callback runs synchronously inside Write and must not
|
|
// recurse into the emulator.
|
|
OnWritePTY(fn func([]byte))
|
|
|
|
// Close releases any underlying resources.
|
|
Close() error
|
|
}
|