From 9458794fa3d2a851b0031485aaabc7072c8e7003 Mon Sep 17 00:00:00 2001
From: "Timothy J. Warren" <tim@timshomepage.net>
Date: Fri, 1 Mar 2024 10:28:12 -0500
Subject: [PATCH] Optimize highlighting escape sequences

---
 src/common/highlight.ts |  4 ++--
 src/common/row.ts       | 12 ++++++++++--
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/common/highlight.ts b/src/common/highlight.ts
index 3c9c58f..af29ece 100644
--- a/src/common/highlight.ts
+++ b/src/common/highlight.ts
@@ -1,4 +1,4 @@
-import Ansi, { AnsiColor } from './ansi.ts';
+import Ansi from './ansi.ts';
 
 export enum HighlightType {
 	None,
@@ -11,6 +11,6 @@ export function highlightToColor(type: HighlightType): string {
 			return Ansi.color256(196);
 
 		default:
-			return Ansi.color(AnsiColor.FgDefault);
+			return Ansi.ResetFormatting;
 	}
 }
diff --git a/src/common/row.ts b/src/common/row.ts
index 48113a7..1b2a65b 100644
--- a/src/common/row.ts
+++ b/src/common/row.ts
@@ -179,13 +179,21 @@ export class Row {
 		const end = Math.min(len, this.rsize);
 		const start = Math.min(offset, len);
 		let result = '';
+		let currentHighlight = HighlightType.None;
 
 		for (let i = start; i < end; i++) {
-			result += highlightToColor(this.hl[i]);
+			const highlightType = this.hl[i];
+
+			if (highlightType !== currentHighlight) {
+				currentHighlight = highlightType;
+				result += highlightToColor(highlightType);
+			}
+
 			result += this.rchars[i];
-			result += Ansi.ResetFormatting;
 		}
 
+		result += Ansi.ResetFormatting;
+
 		return result;
 	}