package main import ( "github.com/op/go-logging" "os" ) var log = logging.MustGetLogger("main") func init() { // Customize the output format logging.SetFormatter(logging.MustStringFormatter("[%{level:.4s}] %{time:2006-01-02T15:04:05} %{shortfile:-20s} %{message}")) logBackend := logging.NewLogBackend(os.Stderr, "", 0) logBackend.Color = true logging.SetBackend(logBackend) }