From 5cf7b19dcce89f847f6f6d62685abaeca2b63e1c Mon Sep 17 00:00:00 2001
From: Yang Zhang <yang_zhang@iapcm.ac.cn>
Date: Tue, 1 Jan 2019 21:52:05 +0800
Subject: [PATCH] Make runewidth treat ambiguous rune as short and fix ui
 display

---
 util/text/left_padded.go      | 9 ++++++++-
 util/text/left_padded_test.go | 6 +++---
 util/text/text.go             | 7 +++++++
 3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/util/text/left_padded.go b/util/text/left_padded.go
index 24bd4d09268f3be98c205ac8a49e367aa89ad756..43e84966bdedc580087a8b17316e3ba07356db14 100644
--- a/util/text/left_padded.go
+++ b/util/text/left_padded.go
@@ -7,6 +7,13 @@ import (
 	"strings"
 )
 
+// Force runewidth not to treat ambiguous runes as wide chars, so that things
+// like unicode ellipsis/up/down/left/right glyphs can have correct runewidth
+// and can be displayed correctly in terminals.
+func init() {
+	runewidth.DefaultCondition.EastAsianWidth = false
+}
+
 // LeftPadMaxLine pads a string on the left by a specified amount and pads the
 // string on the right to fill the maxLength
 func LeftPadMaxLine(text string, length, leftPad int) string {
@@ -15,7 +22,7 @@ func LeftPadMaxLine(text string, length, leftPad int) string {
 	scrWidth := runewidth.StringWidth(text)
 	// truncate and ellipse if needed
 	if scrWidth+leftPad > length {
-		rightPart = runewidth.Truncate(text, length-leftPad, "...")
+		rightPart = runewidth.Truncate(text, length-leftPad, "…")
 	} else if scrWidth+leftPad < length {
 		rightPart = runewidth.FillRight(text, length-leftPad)
 	}
diff --git a/util/text/left_padded_test.go b/util/text/left_padded_test.go
index a8ea12fe5ece055e63dcf730bc1b9989cd259c6a..0be79e32d64ea792a228d18d58bb08eb331cb31f 100644
--- a/util/text/left_padded_test.go
+++ b/util/text/left_padded_test.go
@@ -16,7 +16,7 @@ func TestLeftPadMaxLine(t *testing.T) {
 		},
 		{
 			"foofoofoo",
-			"f...",
+			"foo…",
 			4,
 			0,
 		},
@@ -28,13 +28,13 @@ func TestLeftPadMaxLine(t *testing.T) {
 		},
 		{
 			"foo",
-			"  ...",
+			"  f…",
 			4,
 			2,
 		},
 		{
 			"foofoofoo",
-			"  f...",
+			"  foo…",
 			6,
 			2,
 		},
diff --git a/util/text/text.go b/util/text/text.go
index e7ef4e47f9a3c0cbcc4df47b8d53f20c531fb496..f77fa0e219a2e1847ca84e23170fbadad9f86c2f 100644
--- a/util/text/text.go
+++ b/util/text/text.go
@@ -6,6 +6,13 @@ import (
 	"unicode/utf8"
 )
 
+// Force runewidth not to treat ambiguous runes as wide chars, so that things
+// like unicode ellipsis/up/down/left/right glyphs can have correct runewidth
+// and can be displayed correctly in terminals.
+func init() {
+	runewidth.DefaultCondition.EastAsianWidth = false
+}
+
 // Wrap a text for an exact line size
 // Handle properly terminal color escape code
 func Wrap(text string, lineWidth int) (string, int) {