Initial patterm project

internal/app/cursorshift_test.go

@@ -0,0 +1,77 @@
+package app
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestCursorShifterCUP(t *testing.T) {
+	cs := newCursorShifter(1)
+	got := cs.Shift([]byte("\x1b[H"))
+	want := []byte("\x1b[2;1H")
+	if !bytes.Equal(got, want) {
+		t.Fatalf("CUP home: got %q want %q", got, want)
+	}
+}
+
+func TestCursorShifterCUPRowCol(t *testing.T) {
+	cs := newCursorShifter(1)
+	got := cs.Shift([]byte("\x1b[10;5H"))
+	if string(got) != "\x1b[11;5H" {
+		t.Fatalf("CUP 10;5: got %q", got)
+	}
+}
+
+func TestCursorShifterVPA(t *testing.T) {
+	cs := newCursorShifter(1)
+	got := cs.Shift([]byte("\x1b[7d"))
+	if string(got) != "\x1b[8d" {
+		t.Fatalf("VPA 7: got %q", got)
+	}
+}
+
+func TestCursorShifterDECSTBM(t *testing.T) {
+	cs := newCursorShifter(1)
+	got := cs.Shift([]byte("\x1b[2;20r"))
+	if string(got) != "\x1b[3;21r" {
+		t.Fatalf("DECSTBM: got %q", got)
+	}
+}
+
+func TestCursorShifterPrivateCSIPassthrough(t *testing.T) {
+	cs := newCursorShifter(1)
+	// Alt-screen toggle — private CSI.
+	got := cs.Shift([]byte("\x1b[?1049h"))
+	if string(got) != "\x1b[?1049h" {
+		t.Fatalf("alt-screen: got %q", got)
+	}
+}
+
+func TestCursorShifterSGRPassthrough(t *testing.T) {
+	cs := newCursorShifter(1)
+	got := cs.Shift([]byte("\x1b[1;31mhello\x1b[0m"))
+	if string(got) != "\x1b[1;31mhello\x1b[0m" {
+		t.Fatalf("SGR: got %q", got)
+	}
+}
+
+func TestCursorShifterStraddleChunks(t *testing.T) {
+	cs := newCursorShifter(1)
+	a := cs.Shift([]byte("\x1b["))
+	b := cs.Shift([]byte("5;3H"))
+	got := string(a) + string(b)
+	if got != "\x1b[6;3H" {
+		t.Fatalf("straddle: got %q", got)
+	}
+}
+
+func TestCursorShifterOSCNotRewritten(t *testing.T) {
+	cs := newCursorShifter(1)
+	// OSC body containing what looks like a CSI cursor move — should
+	// NOT be rewritten.
+	in := []byte("\x1b]0;\x1b[5;3Htitle\x07")
+	got := cs.Shift(in)
+	if string(got) != string(in) {
+		t.Fatalf("OSC: got %q want %q", got, in)
+	}
+}