From c35e6b2b4c98649c9f0cce03aac69fddef29729c Mon Sep 17 00:00:00 2001
From: Oliver <oliver@stockperformer.com>
Date: Thu, 17 Oct 2019 12:07:41 +0200
Subject: [PATCH] Avoiding infinite loop on narrow TextViews. Fixes #333

---
 textview.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/textview.go b/textview.go
index 82b878f..6430a93 100644
--- a/textview.go
+++ b/textview.go
@@ -11,6 +11,7 @@ import (
 	"github.com/gdamore/tcell"
 	colorful "github.com/lucasb-eyer/go-colorful"
 	runewidth "github.com/mattn/go-runewidth"
+	"github.com/rivo/uniseg"
 )
 
 var (
@@ -599,6 +600,13 @@ func (t *TextView) reindexBuffer(width int) {
 		if t.wrap && len(str) > 0 {
 			for len(str) > 0 {
 				extract := runewidth.Truncate(str, width, "")
+				if len(extract) == 0 {
+					// We'll extract at least one grapheme cluster.
+					gr := uniseg.NewGraphemes(str)
+					gr.Next()
+					_, to := gr.Positions()
+					extract = str[:to]
+				}
 				if t.wordWrap && len(extract) < len(str) {
 					// Add any spaces from the next line.
 					if spaces := spacePattern.FindStringIndex(str[len(extract):]); spaces != nil && spaces[0] == 0 {