From 871e639abc5882b0c1a4631128952ec4a8e32ed7 Mon Sep 17 00:00:00 2001
From: Raphael Kikuchi <raphael.kikuchi@medsimples.com.br>
Date: Mon, 15 Jun 2026 03:49:33 -0300
Subject: [PATCH] fix: stop libghostty stream logs from corrupting the boo ui
 viewport

libghostty's VT stream parser logs unimplemented sequences at info level
under the `stream` scope (e.g. "OSC 1 (change icon) received and ignored").
The session daemon redirects its stderr to BOO_LOG or /dev/null in
startDaemon, so those lines never reach a terminal there. But `boo ui`
renders in-process with stderr still attached to the user's terminal, so
the same logs paint directly over the rendered viewport and corrupt it
until a manual redraw (C-a l).

Powerlevel10k makes this very visible: it emits an OSC 1 on every prompt
and on preexec, so any command (e.g. `cat ~/.zshrc`) floods the pane with
"received and ignored" lines.

Install a std_options.logFn that drops info-and-below from the `stream`
scope while leaving every other scope untouched. Verified at ReleaseSafe
(the release build config) that this takes the emitted info(stream) count
from 1 to 0; the change is zig fmt clean and `zig build test` passes.
---
 src/main.zig | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/main.zig b/src/main.zig
index 462dff5..f74759a 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -13,6 +13,27 @@ const ui = @import("ui.zig");
 
 pub const version = "0.5.18";
 
+/// Route std.log through a filter. libghostty's VT stream parser logs
+/// unimplemented sequences at info level under the `stream` scope (e.g.
+/// "OSC 1 (change icon) received and ignored"). In `boo ui` the parser runs
+/// in-process with stderr still attached to the user's terminal (unlike the
+/// daemon, which redirects stderr in startDaemon), so those lines paint over
+/// the rendered viewport and corrupt it. Drop info-and-below from `stream`;
+/// every other scope logs as before.
+pub const std_options: std.Options = .{
+    .logFn = filteredLog,
+};
+
+fn filteredLog(
+    comptime level: std.log.Level,
+    comptime scope: @TypeOf(.enum_literal),
+    comptime format: []const u8,
+    args: anytype,
+) void {
+    if (scope == .stream and @intFromEnum(level) >= @intFromEnum(std.log.Level.info)) return;
+    std.log.defaultLog(level, scope, format, args);
+}
+
 /// Exit codes, documented in `boo help`.
 const exit_runtime: u8 = 1;
 const exit_usage: u8 = 2;