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package log
import (
"fmt"
"io"
"os"
"path/filepath"
"strings"
"sync"
"time"
)
type LogLevel int
const (
Verbose3 LogLevel = iota
Verbose2
Verbose1
Info
Warning
Error
)
var logFile *os.File
var logFileMtx sync.Mutex
// printf prints a formatted message to the log file ~/.nerdlog.log
func printf(toStdout bool, format string, a ...interface{}) {
var w io.Writer
if toStdout {
w = os.Stdout
} else {
w = writer()
}
fmt.Fprintf(w, "%s: ", time.Now().Format("2006-01-02T15:04:05.999"))
if !strings.HasSuffix(format, "\n") {
format += "\n"
}
fmt.Fprintf(w, format, a...)
}
func writer() io.Writer {
logFileMtx.Lock()
defer logFileMtx.Unlock()
if logFile == nil {
homeDir, err := os.UserHomeDir()
if err != nil {
panic(err.Error())
}
fname := filepath.Join(homeDir, ".nerdlog.log")
logFile, err = os.OpenFile(fname, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
panic(err.Error())
}
}
return logFile
}
type Logger struct {
minLevel LogLevel
toStdout bool
namespace string
context map[string]string
}
func NewLogger(minLevel LogLevel) *Logger {
return &Logger{
minLevel: minLevel,
}
}
func (l *Logger) thisOrDefault() *Logger {
if l != nil {
return l
}
return &Logger{
minLevel: Info,
}
}
func (l *Logger) WithNamespaceAppended(n string) *Logger {
l = l.thisOrDefault()
ns := l.namespace
if ns != "" {
ns += "/"
}
ns += n
newLogger := *l
newLogger.namespace = ns
return &newLogger
}
func (l *Logger) WithStdout(toStdout bool) *Logger {
l = l.thisOrDefault()
newLogger := *l
newLogger.toStdout = toStdout
return &newLogger
}
func (l *Logger) Verbose3f(format string, a ...interface{}) {
l.Printf(Verbose3, format, a...)
}
func (l *Logger) Verbose2f(format string, a ...interface{}) {
l.Printf(Verbose2, format, a...)
}
func (l *Logger) Verbose1f(format string, a ...interface{}) {
l.Printf(Verbose1, format, a...)
}
func (l *Logger) Infof(format string, a ...interface{}) {
l.Printf(Info, format, a...)
}
func (l *Logger) Warnf(format string, a ...interface{}) {
l.Printf(Warning, format, a...)
}
func (l *Logger) Errorf(format string, a ...interface{}) {
l.Printf(Error, format, a...)
}
func (l *Logger) Printf(level LogLevel, format string, a ...interface{}) {
l = l.thisOrDefault()
if level < l.minLevel {
return
}
if l.namespace != "" {
printf(l.toStdout, "[%s] %s", l.namespace, fmt.Sprintf(format, a...))
} else {
printf(l.toStdout, "%s", l.namespace, fmt.Sprintf(format, a...))
}
}
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