Add config file and argparse

- '~/.config/mach5/config.ini' will be default config file, can be
  changed in command line

- '~/.config/mach5/menu.yml' is the default menu file. Can be changed
  in command line parameters or in config file. Comman line parameters
  take preference.

README.md

@@ -5,4 +5,12 @@ A chords app for Linux
 
 ## TODO
 
-- More checks on command contructor
+- More checks on Command constructor
+- Add checks on Menu constructor
+- Add config
+- Add logger
+
+## Referencias
+
+- [Autokey](https://github.com/autokey/)
+

mach5

@@ -2,7 +2,50 @@
 
 from machlib.menu import Menu, get_data_from
 
-# import subprocess
-# from getkey import getkey, keys
+import argparse
+from configparser import ConfigParser, ExtendedInterpolation
+import os
+import os.path
+import errno
 
-Menu(get_data_from('~/.config/mach5/menu.yml')).get_command().execute()
+# default configuration and menu files
+_default_configuration_file = '~/.config/mach5/config.ini'
+
+
+# -------------------- MAIN --------------------
+
+# Parse command line options
+arg_parser = argparse.ArgumentParser(
+    description='Our simple chords application')
+arg_parser.add_argument('-c', '--cfg', help='Config ini file')
+arg_parser.add_argument('-m', '--menu', help='Menu yaml file')
+
+args = arg_parser.parse_args()
+
+# load config file
+cfg_file = args.cfg if args.cfg else _default_configuration_file
+cfg_file = os.path.expanduser(cfg_file)
+
+if not os.path.exists(cfg_file):
+    raise FileNotFoundError(errno.ENOENT,
+                            os.strerror(errno.ENOENT), cfg_file)
+
+
+_configuration = ConfigParser(interpolation=ExtendedInterpolation())
+found = _configuration.read(cfg_file)
+
+# [TODO] next lines should raise an error
+if (not found):
+    print('[ERROR] Config file not found')
+    raise FileNotFoundError
+
+menu_file = args.menu if args.menu\
+    else _configuration['General']['default_menu_file']
+menu_file = os.path.expanduser(menu_file)
+
+if not os.path.exists(menu_file):
+    raise FileNotFoundError(errno.ENOENT,
+                            os.strerror(errno.ENOENT), menu_file)
+
+
+Menu(get_data_from(menu_file)).get_command().execute()