Implement almost full CJK support.

Display of CJK contents are supported. Adding CJK tags are problematic.

1 files changed, 10 insertions, 9 deletions

diff --git a/util/text/left_padded.go b/util/text/left_padded.go
index 729834db..3b8e13c6 100644
--- a/util/text/left_padded.go
+++ b/util/text/left_padded.go
@@ -3,25 +3,26 @@ package text
 import (
 	"bytes"
 	"fmt"
+	"github.com/mattn/go-runewidth"
 	"strings"
 )
 
-// LeftPadMaxLine pads a string on the left by a specified amount and pads the string on the right to fill the maxLength
+// 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 {
-	runes := []rune(text)
+	rightPart := text
 
+	scrWidth := runewidth.StringWidth(text)
 	// truncate and ellipse if needed
-	if len(runes)+leftPad > length {
-		runes = append(runes[:(length-leftPad-1)], '…')
-	}
-
-	if len(runes)+leftPad < length {
-		runes = append(runes, []rune(strings.Repeat(" ", length-len(runes)-leftPad))...)
+	if scrWidth+leftPad > length {
+		rightPart = runewidth.Truncate(text, length-leftPad, "…")
+	} else if scrWidth+leftPad < length {
+		rightPart = runewidth.FillRight(text, length-leftPad)
 	}
 
 	return fmt.Sprintf("%s%s",
 		strings.Repeat(" ", leftPad),
-		string(runes),
+		rightPart,
 	)
 }