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package debug
import (
"io/ioutil"
"log"
"os"
)
const (
envEnableLog = "GO_PROMPT_ENABLE_LOG"
logFileName = "go-prompt.log"
)
var (
logfile *os.File
logger *log.Logger
)
func init() {
if e := os.Getenv(envEnableLog); e == "true" || e == "1" {
var err error
logfile, err = os.OpenFile(logFileName, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666)
if err == nil {
logger = log.New(logfile, "", log.Llongfile)
return
}
}
logger = log.New(ioutil.Discard, "", log.Llongfile)
}
// Teardown to close logfile
func Teardown() {
if logfile == nil {
return
}
_ = logfile.Close()
}
func writeWithSync(calldepth int, msg string) {
calldepth++
if logfile == nil {
return
}
_ = logger.Output(calldepth, msg)
_ = logfile.Sync() // immediately write msg
}
// Log to output message
func Log(msg string) {
calldepth := 2
writeWithSync(calldepth, msg)
}
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