feat: logx with color (#1872)

* feat: logx with color

* chore: update logs

* fix test error

* chore: change colors of http codes

* chore: add comments

* chore: use faith/color instead of ascii code color

* chore: update colors

* chore: update colors

* chore: fix duplicated slowcall text

* chore: remove slowcall colors

core/logx/writer.go

@@ -10,6 +10,8 @@ import (
 	"strings"
 	"sync"
 	"sync/atomic"
+
+	"github.com/zeromicro/go-zero/core/color"
 )
 
 type (
@@ -239,6 +241,7 @@ func output(writer io.Writer, level string, val interface{}, fields ...LogField)
 
 	switch atomic.LoadUint32(&encoding) {
 	case plainEncodingType:
+		level = wrapLevelWithColor(level)
 		writePlainAny(writer, level, val, buildFields(fields...)...)
 	default:
 		entry := make(logEntryWithFields)
@@ -252,6 +255,30 @@ func output(writer io.Writer, level string, val interface{}, fields ...LogField)
 	}
 }
 
+func wrapLevelWithColor(level string) string {
+	var colour color.Color
+	switch level {
+	case levelAlert:
+		colour = color.FgRed
+	case levelError:
+		colour = color.FgRed
+	case levelFatal:
+		colour = color.FgRed
+	case levelInfo:
+		colour = color.FgBlue
+	case levelSlow:
+		colour = color.FgYellow
+	case levelStat:
+		colour = color.FgGreen
+	}
+
+	if colour == color.NoColor {
+		return level
+	}
+
+	return color.WithColorPadding(level, colour)
+}
+
 func writeJson(writer io.Writer, info interface{}) {
 	if content, err := json.Marshal(info); err != nil {
 		log.Println(err.Error())