logger/logger.go

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// Copyright © 2017
//
// 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 logger
import (
"fmt"
"io"
"os"
"strings"
"time"
lol "github.com/kris-nova/lolgopher"
"github.com/fatih/color"
)
type Logger func(format string, a ...interface{})
const (
AlwaysLabel = "✿"
CriticalLabel = "✖"
DebugLabel = "▶"
InfoLabel = ""
SuccessLabel = "✔"
WarningLabel = "!"
)
var (
Level = 2
Color = true
Fabulous = false
FabulousWriter = lol.NewLolWriter()
FabulousTrueWriter = lol.NewTruecolorLolWriter()
TestMode = false
)
func Always(format string, a ...interface{}) {
a, w := extractLoggerArgs(format, a...)
s := fmt.Sprintf(label(format, AlwaysLabel), a...)
if !TestMode {
if Color {
w = color.Output
s = color.GreenString(s)
} else if Fabulous {
w = FabulousWriter
}
}
fmt.Fprintf(w, s)
}
func Critical(format string, a ...interface{}) {
if Level >= 1 {
a, w := extractLoggerArgs(format, a...)
s := fmt.Sprintf(label(format, CriticalLabel), a...)
if !TestMode {
if Color {
w = color.Output
s = color.RedString(s)
} else if Fabulous {
w = FabulousWriter
}
}
fmt.Fprintf(w, s)
}
}
func Info(format string, a ...interface{}) {
if Level >= 3 {
a, w := extractLoggerArgs(format, a...)
s := fmt.Sprintf(label(format, InfoLabel), a...)
if !TestMode {
if Color {
w = color.Output
s = color.CyanString(s)
} else if Fabulous {
w = FabulousWriter
}
}
fmt.Fprintf(w, s)
}
}
func Success(format string, a ...interface{}) {
if Level >= 3 {
a, w := extractLoggerArgs(format, a...)
s := fmt.Sprintf(label(format, SuccessLabel), a...)
if !TestMode {
if Color {
w = color.Output
s = color.CyanString(s)
} else if Fabulous {
w = FabulousWriter
}
}
fmt.Fprintf(w, s)
}
}
func Debug(format string, a ...interface{}) {
if Level >= 4 {
a, w := extractLoggerArgs(format, a...)
s := fmt.Sprintf(label(format, DebugLabel), a...)
if !TestMode {
if Color {
w = color.Output
s = color.GreenString(s)
} else if Fabulous {
w = FabulousWriter
}
}
fmt.Fprintf(w, s)
}
}
func Warning(format string, a ...interface{}) {
if Level >= 2 {
a, w := extractLoggerArgs(format, a...)
s := fmt.Sprintf(label(format, WarningLabel), a...)
if !TestMode {
if Color {
w = color.Output
s = color.GreenString(s)
} else if Fabulous {
w = FabulousWriter
}
}
fmt.Fprintf(w, s)
}
}
func extractLoggerArgs(format string, a ...interface{}) ([]interface{}, io.Writer) {
var w io.Writer = os.Stdout
if n := len(a); n > 0 {
// extract an io.Writer at the end of a
if value, ok := a[n-1].(io.Writer); ok {
w = value
a = a[0 : n-1]
}
}
return a, w
}
func label(format, label string) string {
t := time.Now()
rfct := t.Format(time.RFC3339)
if !strings.Contains(format, "\n") {
format = fmt.Sprintf("%s%s", format, "\n")
}
return fmt.Sprintf("%s [%s] %s", rfct, label, format)
}