chore: update vendored libghostty-vt

refs #276

1 files changed, 70 insertions, 0 deletions

diff --git a/vendor/libghostty-vt/src/synthetic/cli/Kitty.zig b/vendor/libghostty-vt/src/synthetic/cli/Kitty.zig
new file mode 100644
index 00000000..99a92798
--- /dev/null
+++ b/vendor/libghostty-vt/src/synthetic/cli/Kitty.zig
@@ -0,0 +1,70 @@
+const Kitty = @This();
+
+const std = @import("std");
+const Allocator = std.mem.Allocator;
+const synthetic = @import("../main.zig");
+
+const log = std.log.scoped(.@"kitty-gen");
+
+pub const Options = struct {
+    /// The base64 payload length of each command in bytes, rounded
+    /// down to a multiple of four. Kitty clients typically chunk
+    /// payloads at 4096 bytes.
+    @"data-len": usize = 4096,
+};
+
+opts: Options,
+
+/// The buffer a single generated sequence is written into. Sized to
+/// the payload length plus room for the control data and terminator.
+buf: []u8,
+
+/// Create a new Kitty graphics sequence generator for the given arguments.
+pub fn create(
+    alloc: Allocator,
+    opts: Options,
+) !*Kitty {
+    const ptr = try alloc.create(Kitty);
+    errdefer alloc.destroy(ptr);
+
+    const buf = try alloc.alloc(u8, opts.@"data-len" + 128);
+    errdefer alloc.free(buf);
+
+    ptr.* = .{ .opts = opts, .buf = buf };
+    return ptr;
+}
+
+pub fn destroy(self: *Kitty, alloc: Allocator) void {
+    alloc.free(self.buf);
+    alloc.destroy(self);
+}
+
+pub fn run(self: *Kitty, writer: *std.Io.Writer, rand: std.Random) !void {
+    var gen: synthetic.Kitty = .{
+        .rand = rand,
+        .data_len = self.opts.@"data-len",
+    };
+
+    while (true) {
+        var fixed: std.Io.Writer = .fixed(self.buf);
+        try gen.next(&fixed, self.buf.len);
+        writer.writeAll(fixed.buffered()) catch |err| switch (err) {
+            error.WriteFailed => return,
+        };
+    }
+}
+
+test Kitty {
+    const testing = std.testing;
+    const alloc = testing.allocator;
+
+    const impl: *Kitty = try .create(alloc, .{});
+    defer impl.destroy(alloc);
+
+    var prng = std.Random.DefaultPrng.init(1);
+    const rand = prng.random();
+
+    var buf: [8192]u8 = undefined;
+    var writer: std.Io.Writer = .fixed(&buf);
+    try impl.run(&writer, rand);
+}