move to channel-based logging

irc/logging.go

@@ -0,0 +1,60 @@
+package irc
+
+import (
+	"io"
+	"log"
+	"os"
+)
+
+type Logging struct {
+	debug *log.Logger
+	info  *log.Logger
+	warn  *log.Logger
+	error *log.Logger
+}
+
+var (
+	levels = map[string]uint8{
+		"debug": 4,
+		"info":  3,
+		"warn":  2,
+		"error": 1,
+	}
+	devNull io.Writer
+)
+
+func init() {
+	var err error
+	devNull, err = os.Open(os.DevNull)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func NewLogger(on bool) *log.Logger {
+	return log.New(output(on), "", log.LstdFlags)
+}
+
+func output(on bool) io.Writer {
+	if on {
+		return os.Stdout
+	}
+	return devNull
+}
+
+func (logging *Logging) SetLevel(level string) {
+	logging.debug = NewLogger(levels[level] >= levels["debug"])
+	logging.info = NewLogger(levels[level] >= levels["info"])
+	logging.warn = NewLogger(levels[level] >= levels["warn"])
+	logging.error = NewLogger(levels[level] >= levels["error"])
+}
+
+func NewLogging(level string) *Logging {
+	logging := &Logging{}
+	logging.SetLevel(level)
+	return logging
+}
+
+var (
+	Log = NewLogging("warn")
+)