Add version to config file

safeeyes/safeeyes/config/safeeyes.json

@@ -1,4 +1,7 @@
 {
+	"meta": {
+		"config_version": 1
+	},
     "break_interval": 15, 
     "long_break_duration": 60,
     "no_of_short_breaks_per_long_break": 5, 

safeeyes/safeeyes/safeeyes

@@ -49,6 +49,7 @@ system_style_sheet_path = os.path.join(bin_directory, "config/style/safeeyes_sty
 system_language_directory = os.path.join(bin_directory, "config/lang")
 
 is_active = True
+CONFIGURATION_VERSION = 1
 
 def show_settings():
 	logging.info("Show Settings dialog")
@@ -121,7 +122,8 @@ def disable_safeeyes():
 	is_active = False
 	core.toggle_active_state()
 
-def prepare_local_config_dir():
+def initialize_config():
+	global config
 	config_dir_path = os.path.join(os.path.expanduser('~'), '.config/safeeyes/style')
 	startup_dir_path = os.path.join(os.path.expanduser('~'), '.config/autostart')
 	try:
@@ -152,23 +154,57 @@ def prepare_local_config_dir():
 	if not os.path.isfile(style_sheet_path):
 		shutil.copy2(system_style_sheet_path, style_sheet_path)
 
+	# Read the configuration
+	with open(config_file_path) as config_file:    
+		config = json.load(config_file)
+
+"""
+	Configuration file has a version config_version.
+	It is used to overwrite the exsiting config file if there is an update.
+	Earlier versions did not have this attribute so the following method 
+	checks the version and if it mismatches, it will overwrite the exsiting
+	config files. If the version property is not available, the file is 
+	considered as an older one and replaced by the new configuration file.
+"""
+def validate_config():
+	version_mismatch = False
+	try:
+		# Check the config version
+		config_version = config['meta']['config_version']
+		version_mismatch = config_version is not CONFIGURATION_VERSION
+	except:
+		version_mismatch = True
+
+	if version_mismatch:
+		# Remove ~/.config/safeeyes directory
+		try:
+			shutil.rmtree(os.path.join(os.path.expanduser('~'), '.config/safeeyes'), ignore_errors=False)
+		except:
+			pass
+		
+		# Remove startup script
+		try:
+			os.remove("/usr/share/applications/safeeyes.desktop")
+		except:
+			pass
+
+		# Create config files again
+		initialize_config()
+
 def main():
-	prepare_local_config_dir()
+	initialize_config()
 
 	# Configure logging. Reset with every restart
 	logging.basicConfig(format='%(asctime)s [%(levelname)s] %(message)s', filename=log_file_path, filemode='w', level=logging.INFO)
 	logging.info("Starting Safe Eyes")
 
+	validate_config()
+
 	global break_screen
 	global core
 	global notification
-	global config
 	global tray_icon
 	global language
-
-	# Read the configuration
-	with open(config_file_path) as config_file:    
-		config = json.load(config_file)
 	
 	language_file_path = os.path.join(system_language_directory, str(config['language']) + '.json')
 	with open(language_file_path) as language_file: