Initial patterm project

internal/vt/ghostty_nocgo.go

@@ -0,0 +1,30 @@
+//go:build nocgo
+
+// This file provides a stub GhosttyEmulator for `go vet` / `go build`
+// invocations that pass the `nocgo` build tag, so the rest of the Go code can
+// be checked without `libghostty-vt` being installed. The stub fails at
+// construction time — there is no functional emulator in `nocgo` builds.
+
+package vt
+
+import "errors"
+
+type GhosttyEmulator struct{}
+
+func NewGhosttyEmulator(cols, rows uint16) (*GhosttyEmulator, error) {
+	return nil, errors.New("vt: built with -tags nocgo; libghostty-vt is unavailable")
+}
+
+func (e *GhosttyEmulator) Write(p []byte) (int, error)    { return 0, errStub }
+func (e *GhosttyEmulator) Resize(cols, rows uint16) error { return errStub }
+func (e *GhosttyEmulator) PlainText() (string, error)     { return "", errStub }
+func (e *GhosttyEmulator) ScreenText() (string, error)    { return "", errStub }
+func (e *GhosttyEmulator) SerializeVT() ([]byte, error)   { return nil, errStub }
+func (e *GhosttyEmulator) Cursor() (CursorState, error)   { return CursorState{}, errStub }
+func (e *GhosttyEmulator) ActiveScreen() (Screen, error)  { return 0, errStub }
+func (e *GhosttyEmulator) OnWritePTY(fn func([]byte))     {}
+func (e *GhosttyEmulator) Close() error                   { return nil }
+
+var errStub = errors.New("vt: built with -tags nocgo")
+
+var _ Emulator = (*GhosttyEmulator)(nil)