Add support for loading ids from file

main.go

@@ -39,9 +39,26 @@ const (
 
 func main() {
 	envfile := flag.String("envfile", ".env", "")
+	inputfile := flag.String("if", "", "")
 	flag.Parse()
 
 	args := flag.Args()
+	if *inputfile != "" {
+		filehandle, err := os.Open(*inputfile)
+		if err != nil {
+			Error.Printf("Error opening input file: %v", err)
+			return
+		}
+		defer filehandle.Close()
+		fargs, err := io.ReadAll(filehandle)
+		if err != nil {
+			Error.Printf("Error reading input file: %v", err)
+			return
+		}
+		sargs := strings.Split(string(fargs), "\r\n")
+		args = append(args, sargs...)
+	}
+	
 	if len(args) == 0 {
 		Error.Println("No args specified, please pass space delimited list of workshop ids for downloading")
 		return