delete redundancy char check moved to escapeExKey method

terminal.go

@@ -107,13 +107,7 @@ func (t *Terminal) ioloop() {
 			r = escapeKey(r)
 		} else if isEscapeEx {
 			isEscapeEx = false
-			r = escapeExKey(r)
-			// if hw delete button is pressed it is specified as set ot 4 runes [27,91,51,126]. we are now at 51
-			if r == CharDelete {
-				if d, _, err := buf.ReadRune(); err != nil || d != 126 {
-					buf.UnreadRune()
-				}
-			}
+			r = escapeExKey(r, buf)
 		}
 
 		expectNextChar = true

utils.go

@@ -1,6 +1,7 @@
 package readline
 
 import (
+	"bufio"
 	"strconv"
 	"syscall"
 
@@ -38,10 +39,13 @@ func IsPrintable(key rune) bool {
 }
 
 // translate Esc[X
-func escapeExKey(r rune) rune {
+func escapeExKey(r rune, reader *bufio.Reader) rune {
 	switch r {
 	case 51:
 		r = CharDelete
+		if d, _, err := reader.ReadRune(); err != nil || d != 126 {
+			reader.UnreadRune()
+		}
 	case 'D':
 		r = CharBackward
 	case 'C':