Address PR comments

text_formatter.go

@@ -7,7 +7,6 @@ import (
 	"strings"
 	"sync"
 	"time"
-	"unicode/utf8"
 )
 
 const (
@@ -53,8 +52,9 @@ type TextFormatter struct {
 	// QuoteEmptyFields will wrap empty fields in quotes if true
 	QuoteEmptyFields bool
 
-	// QuoteRune can be set to override the default quote style
-	QuoteRune rune
+	// QuoteCharacter can be set to the override the default quoting character "
+	// with something else. For example: ', or `.
+	QuoteCharacter string
 
 	// Whether the logger's out is to a terminal
 	isTerminal bool
@@ -62,6 +62,15 @@ type TextFormatter struct {
 	sync.Once
 }
 
+func (f *TextFormatter) init(entry *Entry) {
+	if len(f.QuoteCharacter) == 0 {
+		f.QuoteCharacter = "\""
+	}
+	if entry.Logger != nil {
+		f.isTerminal = IsTerminal(entry.Logger.Out)
+	}
+}
+
 func (f *TextFormatter) Format(entry *Entry) ([]byte, error) {
 	var b *bytes.Buffer
 	keys := make([]string, 0, len(entry.Data))
@@ -80,14 +89,7 @@ func (f *TextFormatter) Format(entry *Entry) ([]byte, error) {
 
 	prefixFieldClashes(entry.Data)
 
-	f.Do(func() {
-		if f.QuoteRune == 0 || !utf8.ValidRune(f.QuoteRune) {
-			f.QuoteRune = '"'
-		}
-		if entry.Logger != nil {
-			f.isTerminal = IsTerminal(entry.Logger.Out)
-		}
-	})
+	f.Do(func() { f.init(entry) })
 
 	isColored := (f.ForceColors || f.isTerminal) && !f.DisableColors
 
@@ -172,14 +174,14 @@ func (f *TextFormatter) appendValue(b *bytes.Buffer, value interface{}) {
 		if !f.needsQuoting(value) {
 			b.WriteString(value)
 		} else {
-			fmt.Fprintf(b, "%c%v%c", f.QuoteRune, value, f.QuoteRune)
+			fmt.Fprintf(b, "%s%v%s", f.QuoteCharacter, value, f.QuoteCharacter)
 		}
 	case error:
 		errmsg := value.Error()
 		if !f.needsQuoting(errmsg) {
 			b.WriteString(errmsg)
 		} else {
-			fmt.Fprintf(b, "%c%v%c", f.QuoteRune, errmsg, f.QuoteRune)
+			fmt.Fprintf(b, "%s%v%s", f.QuoteCharacter, errmsg, f.QuoteCharacter)
 		}
 	default:
 		fmt.Fprint(b, value)