From ca6cf3d943989095ede9a9155b45cb03f30dc655 Mon Sep 17 00:00:00 2001
From: Timon Ringwald <timon.ringwald@mequen.de>
Date: Mon, 23 May 2022 14:04:39 +0200
Subject: [PATCH] fixed StringWhile

---
 reader.go      |  3 ++-
 reader_test.go | 12 ++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/reader.go b/reader.go
index 342b710..9d4172f 100644
--- a/reader.go
+++ b/reader.go
@@ -84,8 +84,9 @@ func (r *Reader) UnreadString(str string) error {
 func (r *Reader) StringWhile(f func(rn rune) bool) (string, error) {
 	s := new(strings.Builder)
 
+	var rn rune
 	var err error
-	for rn, err := r.Rune(); err == nil && f(rn); rn, err = r.Rune() {
+	for rn, err = r.Rune(); err == nil && f(rn); rn, err = r.Rune() {
 		s.WriteRune(rn)
 	}
 
diff --git a/reader_test.go b/reader_test.go
index 5a2de01..27a95c5 100644
--- a/reader_test.go
+++ b/reader_test.go
@@ -22,3 +22,15 @@ func TestPos(t *testing.T) {
 		}
 	}
 }
+
+func TestEOF(t *testing.T) {
+	r := NewReader(strings.NewReader("hello world\nasddsa"))
+
+	for line, err := r.StringUntil(isNewline); err == nil; line, err = r.StringUntil(isNewline) {
+		fmt.Println(line, err)
+	}
+}
+
+func isNewline(rn rune) bool {
+	return rn == '\n'
+}