Add option to pass password as file

mu5001tool/__main__.py

@@ -2,12 +2,14 @@ from . import Mu5001Tool
 from .prometheus_exporter import prometheus_exporter
 
 import argparse
+from pathlib import Path
 from pprint import pprint
 
 parser = argparse.ArgumentParser(prog="mu5001tool")
 
 parser.add_argument("--stok", dest="stok", help="Initial session token to use for commands")
 parser.add_argument("--password", dest="password", help="Password for authentication against the device")
+parser.add_argument("--password-file", dest="password_file", type=Path, help="Password for authentication against the device, passed as path to file")
 
 subparsers = parser.add_subparsers()
 
@@ -47,6 +49,7 @@ def main():
     function_arguments.pop("func")
     function_arguments.pop("stok")
     function_arguments.pop("password")
+    function_arguments.pop("password_file")
 
     m = Mu5001Tool()
 
@@ -55,6 +58,12 @@ def main():
 
     if args.password is not None:
         m.set_password(args.password)
+
+    if args.password_file is not None:
+        password = args.password_file.read_text()
+        m.set_password(password)
+
+    if args.password is not None or args.password_file is not None:
         m.login()
 
     args.func(m=m, **function_arguments)