From 9b9082a10b83eb6ea1b10f688fb4fab8cb4e84a5 Mon Sep 17 00:00:00 2001
From: Joe Lim <50560759+joelim-work@users.noreply.github.com>
Date: Tue, 4 Jun 2024 10:09:21 +1000
Subject: [PATCH] Fix image previews containing long lines (#1737)

To reproduce, use `chafa --polite on -f symbols` for an image preview.
---
 nav.go | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/nav.go b/nav.go
index 9937f5a5..ba9b2c3e 100644
--- a/nav.go
+++ b/nav.go
@@ -890,25 +890,29 @@ func (nav *nav) preview(path string, win *win) {
 
 	// bufio.Scanner can't handle files containing long lines if they exceed the
 	// size of its internal buffer
-	addLine := true
+	line := []byte{}
 	for len(reg.lines) < win.h {
-		line, isPrefix, err := reader.ReadLine()
+		bytes, isPrefix, err := reader.ReadLine()
 		if err != nil {
+			if len(line) > 0 {
+				reg.lines = append(reg.lines, string(line))
+			}
 			break
 		}
 
-		for _, r := range line {
-			if r == 0 {
+		for _, byte := range bytes {
+			if byte == 0 {
 				reg.lines = []string{"\033[7mbinary\033[0m"}
 				return
 			}
 		}
 
-		if addLine {
+		line = append(line, bytes...)
+
+		if !isPrefix {
 			reg.lines = append(reg.lines, string(line))
+			line = []byte{}
 		}
-
-		addLine = !isPrefix
 	}
 }