improve alternate screen handling

1 files changed, 81 insertions, 0 deletions

diff --git a/tests/mode.rs b/tests/mode.rs
index fb97e43..d6807a9 100644
--- a/tests/mode.rs
+++ b/tests/mode.rs
@@ -278,21 +278,102 @@ fn modes() {
 #[test]
 fn alternate_buffer() {
     let mut screen = vt100::Screen::new(24, 80);
+
+    // 47
+
+    screen.process(b"\x1bc");
+    assert_eq!(
+        screen.window_contents(0, 0, 23, 79),
+        "\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n"
+    );
+    assert_eq!(screen.cursor_position(), (0, 0));
+    assert!(!screen.alternate_buffer_active());
+
     screen.process(b"\x1b[m\x1b[2J\x1b[H1\r\n2\r\n3\r\n4\r\n5\r\n6\r\n7\r\n8\r\n9\r\n10\r\n11\r\n12\r\n13\r\n14\r\n15\r\n16\r\n17\r\n18\r\n19\r\n20\r\n21\r\n22\r\n23\r\n24");
     assert_eq!(screen.window_contents(0, 0, 23, 79), "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n20\n21\n22\n23\n24\n");
+    assert_eq!(screen.cursor_position(), (23, 2));
+    assert!(!screen.alternate_buffer_active());
+
+    screen.process(b"\x1b[?47h");
+    assert_eq!(
+        screen.window_contents(0, 0, 23, 79),
+        "\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n"
+    );
+    assert_eq!(screen.cursor_position(), (0, 0));
+    assert!(screen.alternate_buffer_active());
+
+    screen.process(b"foobar");
+    assert_eq!(
+        screen.window_contents(0, 0, 23, 79),
+        "foobar\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n"
+    );
+    assert_eq!(screen.cursor_position(), (0, 6));
+    assert!(screen.alternate_buffer_active());
+
+    screen.process(b"\x1b[?47l");
+    assert_eq!(screen.window_contents(0, 0, 23, 79), "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n20\n21\n22\n23\n24\n");
+    assert_eq!(screen.cursor_position(), (23, 2));
     assert!(!screen.alternate_buffer_active());
+
+    screen.process(b"\x1b[?47h");
+    assert_eq!(
+        screen.window_contents(0, 0, 23, 79),
+        "foobar\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n"
+    );
+    assert_eq!(screen.cursor_position(), (0, 6));
+    assert!(screen.alternate_buffer_active());
+
+    screen.process(b"\x1b[?47l");
+    assert_eq!(screen.window_contents(0, 0, 23, 79), "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n20\n21\n22\n23\n24\n");
+    assert_eq!(screen.cursor_position(), (23, 2));
+    assert!(!screen.alternate_buffer_active());
+
+    // 1049
+
+    screen.process(b"\x1bc");
+    assert_eq!(
+        screen.window_contents(0, 0, 23, 79),
+        "\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n"
+    );
+    assert_eq!(screen.cursor_position(), (0, 0));
+    assert!(!screen.alternate_buffer_active());
+
+    screen.process(b"\x1b[m\x1b[2J\x1b[H1\r\n2\r\n3\r\n4\r\n5\r\n6\r\n7\r\n8\r\n9\r\n10\r\n11\r\n12\r\n13\r\n14\r\n15\r\n16\r\n17\r\n18\r\n19\r\n20\r\n21\r\n22\r\n23\r\n24");
+    assert_eq!(screen.window_contents(0, 0, 23, 79), "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n20\n21\n22\n23\n24\n");
+    assert_eq!(screen.cursor_position(), (23, 2));
+    assert!(!screen.alternate_buffer_active());
+
     screen.process(b"\x1b[?1049h");
     assert_eq!(
         screen.window_contents(0, 0, 23, 79),
         "\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n"
     );
+    assert_eq!(screen.cursor_position(), (0, 0));
     assert!(screen.alternate_buffer_active());
+
     screen.process(b"foobar");
     assert_eq!(
         screen.window_contents(0, 0, 23, 79),
         "foobar\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n"
     );
+    assert_eq!(screen.cursor_position(), (0, 6));
+    assert!(screen.alternate_buffer_active());
+
+    screen.process(b"\x1b[?1049l");
+    assert_eq!(screen.window_contents(0, 0, 23, 79), "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n20\n21\n22\n23\n24\n");
+    assert_eq!(screen.cursor_position(), (23, 2));
+    assert!(!screen.alternate_buffer_active());
+
+    screen.process(b"\x1b[?1049h");
+    assert_eq!(
+        screen.window_contents(0, 0, 23, 79),
+        "\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n"
+    );
+    assert_eq!(screen.cursor_position(), (0, 0));
+    assert!(screen.alternate_buffer_active());
+
     screen.process(b"\x1b[?1049l");
     assert_eq!(screen.window_contents(0, 0, 23, 79), "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n20\n21\n22\n23\n24\n");
+    assert_eq!(screen.cursor_position(), (23, 2));
     assert!(!screen.alternate_buffer_active());
 }