From 01f382afeca388d41baff4ab673ca7d4924c9659 Mon Sep 17 00:00:00 2001
From: Roman Suvorov <suvorov83@gmail.com>
Date: Thu, 15 Sep 2022 20:04:04 +0300
Subject: [PATCH] change tail to prefix

---
 runewidth.go      | 10 +++++-----
 runewidth_test.go |  4 ++--
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/runewidth.go b/runewidth.go
index c08c366..b3e6ed7 100644
--- a/runewidth.go
+++ b/runewidth.go
@@ -215,9 +215,9 @@ func (c *Condition) Truncate(s string, w int, tail string) string {
 }
 
 // TrimPrefix cuts w cells from the beginning of the `s`.
-func (c *Condition) TrimPrefix(s string, w int, tail string) string {
+func (c *Condition) TrimPrefix(s string, w int, prefix string) string {
 	if c.StringWidth(s) <= w {
-		return "" + tail
+		return prefix
 	}
 
 	var width int
@@ -240,7 +240,7 @@ func (c *Condition) TrimPrefix(s string, w int, tail string) string {
 		width += chWidth
 	}
 
-	return s[pos:] + tail
+	return prefix + s[pos:]
 }
 
 // Wrap return string wrapped with w cells
@@ -321,8 +321,8 @@ func Truncate(s string, w int, tail string) string {
 }
 
 // TrimPrefix cuts w cells from the beginning of the `s`.
-func TrimPrefix(s string, w int, tail string) string {
-	return DefaultCondition.TrimPrefix(s, w, tail)
+func TrimPrefix(s string, w int, prefix string) string {
+	return DefaultCondition.TrimPrefix(s, w, prefix)
 }
 
 // Wrap return string wrapped with w cells
diff --git a/runewidth_test.go b/runewidth_test.go
index 20fc9d5..d69fafa 100644
--- a/runewidth_test.go
+++ b/runewidth_test.go
@@ -397,7 +397,7 @@ func Test_TrimPrefix(t *testing.T) {
 	t.Run("ascii: with tail", func(t *testing.T) {
 		t.Parallel()
 		s := "source"
-		expected := "ce..."
+		expected := "...ce"
 
 		out := TrimPrefix(s, 4, "...")
 		if out != expected {
@@ -419,7 +419,7 @@ func Test_TrimPrefix(t *testing.T) {
 	t.Run("non ascii: with tail", func(t *testing.T) {
 		t.Parallel()
 		s := "あいうえお"
-		expected := "えお..."
+		expected := "...えお"
 
 		out := TrimPrefix(s, 6, "...")
 		if out != expected {