From 0e999482cb13c194427d47687a49473e1e240a20 Mon Sep 17 00:00:00 2001
From: Junegunn Choi <junegunn.c@gmail.com>
Date: Mon, 25 Dec 2023 17:05:14 +0900
Subject: [PATCH] Fix handling of empty ANSI color sequence

Fix #3320
---
 src/ansi.go      | 9 +++++++++
 src/ansi_test.go | 3 +++
 2 files changed, 12 insertions(+)

diff --git a/src/ansi.go b/src/ansi.go
index 05e0861..e917a4f 100644
--- a/src/ansi.go
+++ b/src/ansi.go
@@ -351,9 +351,11 @@ func interpretCode(ansiCode string, prevState *ansiState) ansiState {
 	ptr := &state.fg
 
 	var delimiter byte = 0
+	count := 0
 	for len(ansiCode) != 0 {
 		var num int
 		if num, delimiter, ansiCode = parseAnsiCode(ansiCode, delimiter); num != -1 {
+			count++
 			switch state256 {
 			case 0:
 				switch num {
@@ -435,6 +437,13 @@ func interpretCode(ansiCode string, prevState *ansiState) ansiState {
 		}
 	}
 
+	// Empty sequence: reset
+	if count == 0 {
+		state.fg = -1
+		state.bg = -1
+		state.attr = 0
+	}
+
 	if state256 > 0 {
 		*ptr = -1
 	}
diff --git a/src/ansi_test.go b/src/ansi_test.go
index f352c99..b5481e5 100644
--- a/src/ansi_test.go
+++ b/src/ansi_test.go
@@ -348,6 +348,9 @@ func TestAnsiCodeStringConversion(t *testing.T) {
 	}
 	assert("\x1b[m", nil, "")
 	assert("\x1b[m", &ansiState{attr: tui.Blink, lbg: -1}, "")
+	assert("\x1b[0m", &ansiState{fg: 4, bg: 4, lbg: -1}, "")
+	assert("\x1b[;m", &ansiState{fg: 4, bg: 4, lbg: -1}, "")
+	assert("\x1b[;;m", &ansiState{fg: 4, bg: 4, lbg: -1}, "")
 
 	assert("\x1b[31m", nil, "\x1b[31;49m")
 	assert("\x1b[41m", nil, "\x1b[39;41m")