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log.go
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log.go
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// Package flog provides human-optimized, formatted logging.
package flog
import (
"fmt"
"github.com/fatih/color"
"io"
"os"
"time"
)
type Level string
var (
INFO = Level(color.HiBlueString("INFO"))
SUCCESS = Level(color.HiGreenString("SUCCESS"))
ERROR = Level(color.RedString("ERROR"))
FATAL = Level(color.RedString("FATAL"))
)
type Logger struct {
W io.Writer
Prefix string
}
func (l *Logger) WithPrefix(p string, args ...interface{}) *Logger {
ll := *l
ll.Prefix += fmt.Sprintf(p, args...)
return &ll
}
func (l *Logger) Info(msg string, args ...interface{}) {
l.Log(INFO, msg, args...)
}
func (l *Logger) Success(msg string, args ...interface{}) {
l.Log(SUCCESS, msg, args...)
}
func (l *Logger) Error(msg string, args ...interface{}) {
l.Log(ERROR, msg, args...)
}
func (l *Logger) Fatal(msg string, args ...interface{}) {
l.Log(FATAL, msg, args...)
}
func (l *Logger) Log(lvl Level, msg string, args ...interface{}) {
fmt.Fprintf(
l.W,
fmt.Sprintf("%v %v\t", time.Now().Format(`2006-01-02 15:04:05`), lvl)+
l.Prefix+msg+"\n", args...,
)
if lvl == FATAL {
os.Exit(1)
}
}
// New returns a new logger.
func New() *Logger {
return &Logger{
W: os.Stderr,
}
}
func Info(msg string, args ...interface{}) {
New().Log(INFO, msg, args...)
}
func Success(msg string, args ...interface{}) {
New().Log(SUCCESS, msg, args...)
}
func Error(msg string, args ...interface{}) {
New().Log(ERROR, msg, args...)
}
func Fatal(msg string, args ...interface{}) {
New().Log(FATAL, msg, args...)
}
// Log logs a message with the default logger.
func Log(l Level, m string, args ...interface{}) {
New().Log(l, m, args...)
}