add cobra command utilities and log formatter

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

cli/clifmt/formatter.go

@@ -0,0 +1,84 @@
+// Copyright 2023 Linka Cloud  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package clifmt
+
+import (
+	"bytes"
+	"strings"
+	"time"
+
+	"github.com/fatih/color"
+	"github.com/sirupsen/logrus"
+)
+
+type TimeFormat string
+
+const (
+	NoneTimeFormat     TimeFormat = "none"
+	FullTimeFormat     TimeFormat = "full"
+	RelativeTimeFormat TimeFormat = "relative"
+)
+
+const (
+	red    = 31
+	yellow = 33
+	blue   = 36
+	white  = 39
+	gray   = 90
+)
+
+func New(f TimeFormat) logrus.Formatter {
+	return &clifmt{start: time.Now(), format: f}
+}
+
+type clifmt struct {
+	start  time.Time
+	format TimeFormat
+}
+
+func (f *clifmt) Format(entry *logrus.Entry) ([]byte, error) {
+	var b bytes.Buffer
+	var c *color.Color
+	switch entry.Level {
+	case logrus.DebugLevel, logrus.TraceLevel:
+		c = color.New(gray)
+	case logrus.WarnLevel:
+		c = color.New(yellow)
+	case logrus.ErrorLevel, logrus.FatalLevel, logrus.PanicLevel:
+		c = color.New(red)
+	default:
+		c = color.New(white)
+	}
+	msg := entry.Message
+	if len(entry.Message) > 0 && entry.Level < logrus.DebugLevel {
+		msg = strings.ToTitle(string(msg[0])) + msg[1:]
+	}
+
+	var err error
+	switch f.format {
+	case FullTimeFormat:
+		_, err = c.Fprintf(&b, "[%s] %s\n", entry.Time.Format("2006-01-02 15:04:05"), entry.Message)
+	case RelativeTimeFormat:
+		_, err = c.Fprintf(&b, "[%5v] %s\n", entry.Time.Sub(f.start).Truncate(time.Second).String(), msg)
+	case NoneTimeFormat:
+		fallthrough
+	default:
+		_, err = c.Fprintln(&b, msg)
+	}
+	if err != nil {
+		return nil, err
+	}
+	return b.Bytes(), nil
+}