Adding the initial forked commit from the go-logging library.

Customization of the original library will continue from here to make it
leaner and more suited for general use in MimirTech projects.

examples/example.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"os"
+)
+
+var log = logging.MustGetLogger("example")
+
+// Example format string. Everything except the message has a custom color
+// which is dependent on the log level. Many fields have a custom output
+// formatting too, eg. the time returns the hour down to the milli second.
+var format = logging.MustStringFormatter(
+	`%{color}%{time:15:04:05.000} %{shortfunc} ▶ %{level:.4s} %{id:03x}%{color:reset} %{message}`,
+)
+
+// Password is just an example type implementing the Redactor interface. Any
+// time this is logged, the Redacted() function will be called.
+type Password string
+
+func (p Password) Redacted() interface{} {
+	return logging.Redact(string(p))
+}
+
+func main() {
+	// For demo purposes, create two backend for os.Stderr.
+	backend1 := logging.NewLogBackend(os.Stderr, "", 0)
+	backend2 := logging.NewLogBackend(os.Stderr, "", 0)
+
+	// For messages written to backend2 we want to add some additional
+	// information to the output, including the used log level and the name of
+	// the function.
+	backend2Formatter := logging.NewBackendFormatter(backend2, format)
+
+	// Only errors and more severe messages should be sent to backend1
+	backend1Leveled := logging.AddModuleLevel(backend1)
+	backend1Leveled.SetLevel(logging.ERROR, "")
+
+	// Set the backends to be used.
+	logging.SetBackend(backend1Leveled, backend2Formatter)
+
+	log.Debugf("debug %s", Password("secret"))
+	log.Info("info")
+	log.Notice("notice")
+	log.Warning("warning")
+	log.Error("err")
+	log.Critical("crit")
+}