diff --git a/.gitignore b/.gitignore
index 66fd13c..07e2b73 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+.idea
+
 # Binaries for programs and plugins
 *.exe
 *.exe~
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..3204a9c
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/AkvicorEdwards/glog
+
+go 1.15
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..ce806c5
--- /dev/null
+++ b/main.go
@@ -0,0 +1,77 @@
+package glog
+
+import (
+	"log"
+	"os"
+)
+
+const (
+	ZERO = 0
+	INFO = 1 << iota
+	DEBUG
+	WARNING
+)
+
+var mask = INFO | WARNING
+
+var log_file *os.File
+var file_logger *log.Logger
+
+func SetMask(m int) {
+	mask = m
+}
+
+func SetLogFile(path string) error {
+	var err error
+	log_file, err = os.OpenFile(path, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
+	if err != nil {
+		return err
+	}
+	file_logger = log.New(log_file, "", log.LstdFlags|log.Lshortfile)
+	return nil
+}
+
+func CloseFile() {
+	file_logger = nil
+	err := log_file.Close()
+	if err != nil {
+		log.Println("failed to close log file")
+	}
+	log_file = nil
+}
+
+func Info(format string, values ...interface{}) {
+	if (mask & INFO) != 0 {
+		log.Printf("[INFO] "+format, values...)
+		if file_logger != nil {
+			file_logger.Printf("[INFO] "+format, values...)
+		}
+	}
+}
+
+func Debug(format string, values ...interface{}) {
+	if (mask & DEBUG) != 0 {
+		log.Printf("[DEBUG] "+format, values...)
+		if file_logger != nil {
+			file_logger.Printf("[DEBUG] "+format, values...)
+		}
+	}
+}
+
+func Warning(format string, values ...interface{}) {
+	if (mask & WARNING) != 0 {
+		log.Printf("[WARNING] "+format, values...)
+		if file_logger != nil {
+			file_logger.Printf("[WARNING] "+format, values...)
+		}
+	}
+}
+
+func Fatal(format string, values ...interface{}) {
+	if file_logger != nil {
+		log.Printf("[FATAL] "+format, values...)
+		file_logger.Fatalf("[FATAL] "+format, values...)
+	} else {
+		log.Fatalf("[FATAL] "+format, values...)
+	}
+}