From b25edc3e9367b4bd26d64e24dd819a72d5e48cf4 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <m@mitchellh.com>
Date: Tue, 17 Feb 2026 13:04:31 -0800
Subject: [PATCH] termio: don't auto-generate palette if user didn't customize
 any

This fixes the issue where our palette generation was changing our
default palette. The default palette is based on some well known values
chosen from various terminals and it was a bit jarring to have it
change.

We now only auto-generate the palette if the user has customized at
least one entry.
---
 src/termio/Termio.zig | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/src/termio/Termio.zig b/src/termio/Termio.zig
index 40af3cd94..dee58dc22 100644
--- a/src/termio/Termio.zig
+++ b/src/termio/Termio.zig
@@ -175,15 +175,25 @@ pub const DerivedConfig = struct {
         errdefer arena.deinit();
         const alloc = arena.allocator();
 
-        const palette: terminalpkg.color.Palette = if (config.@"palette-generate")
-            terminalpkg.color.generate256Color(
-                config.palette.value,
-                config.palette.mask,
-                config.background.toTerminalRGB(),
-                config.foreground.toTerminalRGB(),
-            )
-        else
-            config.palette.value;
+        const palette: terminalpkg.color.Palette = palette: {
+            if (config.@"palette-generate") generate: {
+                if (config.palette.mask.findFirstSet() == null) {
+                    // If the user didn't set any values manually, then
+                    // we're using the default palette and we don't need
+                    // to apply the generation code to it.
+                    break :generate;
+                }
+
+                break :palette terminalpkg.color.generate256Color(
+                    config.palette.value,
+                    config.palette.mask,
+                    config.background.toTerminalRGB(),
+                    config.foreground.toTerminalRGB(),
+                );
+            }
+
+            break :palette config.palette.value;
+        };
 
         return .{
             .palette = palette,