Added logging to file feature

config/log.go

@@ -0,0 +1,29 @@
+package config
+
+import (
+	"log"
+	"os"
+
+	"github.com/spf13/viper"
+
+	"git.metaunix.net/BitGoblin/adept/util"
+)
+
+func InitLogging() *os.File {
+	var fileHandle *os.File = nil
+
+	if viper.GetBool("log_to_file") {
+		// open a file
+		var err error
+		fileHandle, err = os.OpenFile(util.ResolveTilde(viper.GetString("log_file")), os.O_APPEND | os.O_CREATE | os.O_RDWR, 0644)
+		if err != nil {
+		  log.Fatalf("Error opening log file: %v", err)
+		  os.Exit(1)
+		}
+
+		// set logging to file handle
+		log.SetOutput(fileHandle)
+	}
+
+	return fileHandle
+}