tty: use grapheme cache in the tty run method

We only need the grapheme cache when we are parsing input

Signed-off-by: Tim Culverhouse <tim@timculverhouse.com>

src/Tty.zig

@@ -6,6 +6,7 @@ const Vaxis = vaxis.Vaxis;
 const Event = @import("event.zig").Event;
 const parser = @import("parser.zig");
 const Key = vaxis.Key;
+const GraphemeCache = @import("GraphemeCache.zig");
 
 const log = std.log.scoped(.tty);
 
@@ -112,6 +113,9 @@ pub fn run(
     };
     try WinchHandler.init(vx, self.fd);
 
+    // initialize a grapheme cache
+    var cache: GraphemeCache = .{};
+
     // Set up fds for polling
     var pollfds: [2]std.os.pollfd = .{
         .{ .fd = self.fd, .events = std.os.POLL.IN, .revents = undefined },
@@ -132,7 +136,7 @@ pub fn run(
         var start: usize = 0;
         while (start < n) {
             const result = try parser.parse(buf[start..n]);
-            start = result.n;
+            start += result.n;
             // TODO: if we get 0 byte read, copy the remaining bytes to the
             // beginning of the buffer and read mmore? this should only happen
             // if we are in the middle of a grapheme at and filled our
@@ -143,7 +147,12 @@ pub fn run(
             switch (event) {
                 .key_press => |key| {
                     if (@hasField(EventType, "key_press")) {
-                        vx.postEvent(.{ .key_press = key });
+                        // HACK: yuck. there has to be a better way
+                        var mut_key = key;
+                        if (key.text) |text| {
+                            mut_key.text = cache.put(text);
+                        }
+                        vx.postEvent(.{ .key_press = mut_key });
                     }
                 },
                 .focus_in => {

src/parser.zig

@@ -79,7 +79,6 @@ pub fn parse(input: []const u8) !Result {
                         state = .escape;
                         continue;
                     },
-                    // 0x20...0x7E => .{ .codepoint = b },
                     0x7F => .{ .codepoint = Key.backspace },
                     else => blk: {
                         var iter: CodePointIterator = .{ .bytes = input[i..] };

src/vaxis.zig

@@ -9,7 +9,6 @@ const Screen = @import("Screen.zig");
 const Window = @import("Window.zig");
 const Options = @import("Options.zig");
 const Style = @import("cell.zig").Style;
-const GraphemeCache = @import("GraphemeCache.zig");
 
 /// Vaxis is the entrypoint for a Vaxis application. The provided type T should
 /// be a tagged union which contains all of the events the application will
@@ -47,9 +46,6 @@ pub fn Vaxis(comptime T: type) type {
         renders: usize = 0,
         render_dur: i128 = 0,
 
-        // grapheme cache
-        g_cache: GraphemeCache = .{},
-
         /// Initialize Vaxis with runtime options
         pub fn init(_: Options) !Self {
             return Self{