feat: add configurable pane screen and scrollback clearing (#4383)

1 files changed, 34 insertions, 0 deletions

diff --git a/vendor/libghostty-vt/src/terminal/c/terminal.zig b/vendor/libghostty-vt/src/terminal/c/terminal.zig
index 73097573..91bbe310 100644
--- a/vendor/libghostty-vt/src/terminal/c/terminal.zig
+++ b/vendor/libghostty-vt/src/terminal/c/terminal.zig
@@ -1504,6 +1504,40 @@ pub fn reset(terminal_: Terminal) callconv(lib.calling_conv) void {
     t.fullReset();
 }
 
+/// Clear output without feeding synthetic bytes into the child's VT stream.
+pub fn clearScreen(terminal_: Terminal) callconv(lib.calling_conv) bool {
+    const t: *ZigTerminal = (terminal_ orelse return false).terminal;
+    if (t.screens.active_key == .alternate) return false;
+    const screen = t.screens.active;
+
+    var first = screen.cursor.y;
+    while (first > 0) {
+        const pin = screen.pages.pin(.{ .active = .{ .y = first } }).?;
+        if (!pin.rowAndCell().row.wrap_continuation) break;
+        first -= 1;
+    }
+    var last = screen.cursor.y;
+    while (last + 1 < t.rows) {
+        const pin = screen.pages.pin(.{ .active = .{ .y = last } }).?;
+        if (!pin.rowAndCell().row.wrap) break;
+        last += 1;
+    }
+
+    screen.clearSelection();
+    if (last + 1 < t.rows) {
+        screen.clearRows(.{ .active = .{ .y = last + 1 } }, null, false);
+    }
+    screen.eraseHistory(null);
+    if (first > 0) screen.eraseActive(first - 1);
+    screen.pages.pin(.{ .active = .{} }).?.rowAndCell().row.wrap_continuation = false;
+    screen.scroll(.active);
+    if (comptime build_options.kitty_graphics) {
+        screen.kitty_images.delete(t.io(), screen.alloc, t, .{ .all = true });
+    }
+    t.flags.dirty.clear = true;
+    return true;
+}
+
 /// C: GhosttyKittyGraphics
 pub const KittyGraphics = kitty_gfx_c.KittyGraphics;