feat: finish ghostty pane backend integration

1 files changed, 39 insertions, 0 deletions

diff --git a/vendor/libghostty-vt/src/terminal/focus.zig b/vendor/libghostty-vt/src/terminal/focus.zig
new file mode 100644
index 00000000..91c579e1
--- /dev/null
+++ b/vendor/libghostty-vt/src/terminal/focus.zig
@@ -0,0 +1,39 @@
+const std = @import("std");
+const lib = @import("lib.zig");
+
+/// Maximum number of bytes that `encode` will write. Any users of this
+/// should be resilient to this changing, so this is always a specific
+/// value (e.g. we don't add unnecessary padding).
+pub const max_encode_size = 3;
+
+/// A focus event that can be reported to the application running in the
+/// terminal when focus reporting mode (mode 1004) is enabled.
+pub const Event = lib.Enum(lib.target, &.{
+    "gained",
+    "lost",
+});
+
+/// Encode a focus in/out report (CSI I / CSI O).
+pub fn encode(
+    writer: *std.Io.Writer,
+    event: Event,
+) std.Io.Writer.Error!void {
+    try writer.writeAll(switch (event) {
+        .gained => "\x1B[I",
+        .lost => "\x1B[O",
+    });
+}
+
+test "encode focus gained" {
+    var buf: [max_encode_size]u8 = undefined;
+    var writer: std.Io.Writer = .fixed(&buf);
+    try encode(&writer, .gained);
+    try std.testing.expectEqualStrings("\x1B[I", writer.buffered());
+}
+
+test "encode focus lost" {
+    var buf: [max_encode_size]u8 = undefined;
+    var writer: std.Io.Writer = .fixed(&buf);
+    try encode(&writer, .lost);
+    try std.testing.expectEqualStrings("\x1B[O", writer.buffered());
+}