From 37b0d5c69df7873bfd39ab25e64a1c07179b296c Mon Sep 17 00:00:00 2001
From: Tim Culverhouse <tim@timculverhouse.com>
Date: Tue, 11 Jun 2024 13:59:07 -0500
Subject: [PATCH] widgets(terminal): read full codepoints

Only read full codepoints. Some programs will split codepoints between
reads, which can mess with our parser (looking at you, btop)
---
 src/widgets/terminal/Parser.zig | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/widgets/terminal/Parser.zig b/src/widgets/terminal/Parser.zig
index cccdde6..77564a5 100644
--- a/src/widgets/terminal/Parser.zig
+++ b/src/widgets/terminal/Parser.zig
@@ -66,6 +66,17 @@ pub fn parseReader(self: *Parser, buffered: *BufferedReader) !Event {
 
 inline fn parseGround(self: *Parser, reader: *BufferedReader) !Event {
     var buf: [1]u8 = undefined;
+    {
+        std.debug.assert(self.buf.items.len > 0);
+        // Handle first byte
+        const len = try std.unicode.utf8ByteSequenceLength(self.buf.items[0]);
+        var i: usize = 1;
+        while (i < len) : (i += 1) {
+            const read = try reader.read(&buf);
+            if (read == 0) return error.EOF;
+            try self.buf.append(buf[0]);
+        }
+    }
     while (true) {
         if (reader.start == reader.end) return .{ .print = self.buf.items };
         const n = try reader.read(&buf);
@@ -78,6 +89,14 @@ inline fn parseGround(self: *Parser, reader: *BufferedReader) !Event {
             },
             else => {
                 try self.buf.append(b);
+                const len = try std.unicode.utf8ByteSequenceLength(b);
+                var i: usize = 1;
+                while (i < len) : (i += 1) {
+                    const read = try reader.read(&buf);
+                    if (read == 0) return error.EOF;
+
+                    try self.buf.append(buf[0]);
+                }
             },
         }
     }