feat: Support SGR 59 (reset underline color to default)

Muscraft · Muscraft · commit d82d083aa05e · 2026-03-13T12:47:25.000-06:00
diff --git a/crates/anstyle-svg/src/adapter.rs b/crates/anstyle-svg/src/adapter.rs
@@ -222,6 +222,10 @@ impl anstyle_parse::Perform for AnsiCapture {
                         color_target = ColorTarget::Underline;
                         state = CsiState::PrepareCustomColor;
                     }
+                    (CsiState::Normal, 59) => {
+                        style = style.underline_color(None);
+                        break;
+                    }
                     (CsiState::Normal, 90..=97) => {
                         let color = to_ansi_color(value - 90)
                             .expect("within 4-bit range")
diff --git a/crates/anstyle-svg/tests/underline_color_reset.html b/crates/anstyle-svg/tests/underline_color_reset.html
@@ -25,9 +25,9 @@
 <body class="bg">
 
   <div class="container fg">
-<span class="underline-rgb-FF0000 underline">red underline default color underline</span><span class="underline-rgb-FF0000"> normal</span><br />
-<span class="underline-ansi256-202 underline">orange underline default color underline</span><span class="underline-ansi256-202"> normal</span><br />
-<span class="underline-rgb-0080FF underline">blue underline default color underline</span><span class="underline-rgb-0080FF"> normal</span><br />
+<span class="underline-rgb-FF0000 underline">red underline</span><span class="underline"> default color underline</span><span> normal</span><br />
+<span class="underline-ansi256-202 underline">orange underline</span><span class="underline"> default color underline</span><span> normal</span><br />
+<span class="underline-rgb-0080FF underline">blue underline</span><span class="underline"> default color underline</span><span> normal</span><br />
 <br />
   </div>
 
diff --git a/crates/anstyle-svg/tests/underline_color_reset.svg b/crates/anstyle-svg/tests/underline_color_reset.svg
@@ -20,11 +20,11 @@
   <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
 
   <text xml:space="preserve" class="container fg">
-    <tspan x="10px" y="28px"><tspan class="underline-rgb-FF0000 underline">red underline default color underline</tspan><tspan class="underline-rgb-FF0000"> normal</tspan>
+    <tspan x="10px" y="28px"><tspan class="underline-rgb-FF0000 underline">red underline</tspan><tspan class="underline"> default color underline</tspan><tspan> normal</tspan>
 </tspan>
-    <tspan x="10px" y="46px"><tspan class="underline-ansi256-202 underline">orange underline default color underline</tspan><tspan class="underline-ansi256-202"> normal</tspan>
+    <tspan x="10px" y="46px"><tspan class="underline-ansi256-202 underline">orange underline</tspan><tspan class="underline"> default color underline</tspan><tspan> normal</tspan>
 </tspan>
-    <tspan x="10px" y="64px"><tspan class="underline-rgb-0080FF underline">blue underline default color underline</tspan><tspan class="underline-rgb-0080FF"> normal</tspan>
+    <tspan x="10px" y="64px"><tspan class="underline-rgb-0080FF underline">blue underline</tspan><tspan class="underline"> default color underline</tspan><tspan> normal</tspan>
 </tspan>
     <tspan x="10px" y="82px">
 </tspan>
