feat: set configurable log level and log format

main.go

@@ -1,9 +1,48 @@
 package main
 
 import (
+	"os"
+	"strings"
+
 	"github.com/mirceanton/talswitcher/cmd"
+	log "github.com/sirupsen/logrus"
 )
 
+func SetLogLevel() {
+	logLevel := os.Getenv("TALSWITCHER_LOG_LEVEL")
+	if logLevel == "" {
+		logLevel = "info"
+	}
+
+	level, err := log.ParseLevel(strings.ToLower(logLevel))
+	if err != nil {
+		log.Fatalf("Invalid log level: %v", err)
+	}
+	log.SetLevel(level)
+}
+
+func SetLogFormat() {
+	logFormat := os.Getenv("TALSWITCHER_LOG_FORMAT")
+	if logFormat == "" {
+		logFormat = "text"
+	}
+
+	switch strings.ToLower(logFormat) {
+	case "json":
+		log.SetFormatter(&log.JSONFormatter{})
+	case "text":
+		log.SetFormatter(&log.TextFormatter{FullTimestamp: true})
+
+	default:
+		log.Fatalf("Invalid logformat: %v", logFormat)
+	}
+}
+
+func init() {
+	SetLogLevel()
+	SetLogFormat()
+}
+
 func main() {
 	cmd.Execute()
 }