Do not start SafeEyes if another instance is already running

README.md

@@ -32,11 +32,11 @@ yaourt -S safeeyes
 ### Other Linux:
 1: Install the dependencies:
 
-   * Arch: `hicolor-icon-theme`, `libappindicator-gtk3`, `xorg-xprop`, `python2-xlib`, `python2-gobject`, `python2-dbus`, `python2-babel`, `xprintidle` and `python-pyaudio`
+   * Arch: `hicolor-icon-theme`, `libappindicator-gtk3`, `xorg-xprop`, `python2-xlib`, `python2-gobject`, `python2-dbus`, `python2-babel`, `xprintidle`, `python-psutil` and `python-pyaudio` 
 
-   * Debian: `gir1.2-appindicator3-0.1`, `python-xlib`, `python-gobject`, `python-gi`, `python-dbus`, `gir1.2-notify-0.7`, `python-gtk2`, `python-babel`, `xprintidle` and `python-pyaudio`
+   * Debian: `gir1.2-appindicator3-0.1`, `python-xlib`, `python-gobject`, `python-gi`, `python-dbus`, `gir1.2-notify-0.7`, `python-gtk2`, `python-babel`, `xprintidle`, `python-psutil`  and `python-pyaudio`
 
-   * Fedora 24: `libappindicator-gtk3`, `python-xlib`, `python-gobject`, `xorg-x11-utils`, `python-dbus`, `python-babel`, `xprintidle` and `python-pyaudio`
+   * Fedora 24: `libappindicator-gtk3`, `python-xlib`, `python-gobject`, `xorg-x11-utils`, `python-dbus`, `python-babel`, `xprintidle`, `python-psutil`  and `python-pyaudio`
 
 2: Download and extract [safeeyes.tar.gz](https://github.com/slgobinath/SafeEyes/releases/download/v1.1.8/safeeyes.tar.gz) into `/`: `sudo tar -xzvf safeeyes.tar.gz -C /`
 

safeeyes/debian/control

@@ -8,7 +8,7 @@ Homepage: https://github.com/slgobinath/SafeEyes/
 
 Package: safeeyes
 Architecture: any
-Depends: gir1.2-appindicator3-0.1, python (>= 2.7.0), python-xlib, python-gi, python-dbus, gir1.2-notify-0.7, python-gtk2, python-babel, xprintidle, python-pyaudio
+Depends: gir1.2-appindicator3-0.1, python (>= 2.7.0), python-xlib, python-gi, python-dbus, gir1.2-notify-0.7, python-gtk2, python-babel, xprintidle, python-pyaudio, python-psutil
 Description: Safe Eyes
  Safe Eyes is a simple tool to remind you to take periodic breaks for your eyes. This is essential for anyone spending more time on the computer to avoid eye strain and other physical problems.
  .

safeeyes/safeeyes/safeeyes

@@ -19,6 +19,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import os, gi, json, shutil, dbus, logging, operator, Utility
+import psutil
 from threading import Timer
 from dbus.mainloop.glib import DBusGMainLoop
 from BreakScreen import BreakScreen
@@ -229,7 +230,7 @@ def validate_config():
 			shutil.rmtree(os.path.join(Utility.home_directory, '.config/safeeyes'), ignore_errors=False)
 		except:
 			pass
-		
+
 		# Remove startup script
 		try:
 			os.remove(os.path.join(Utility.home_directory, '.config/autostart/safeeyes.desktop'))
@@ -254,6 +255,22 @@ def read_lang_files():
 
 	return languages
 
+def running():
+	'''
+		Check if SafeEyes is already running.
+	'''
+	for proc in psutil.process_iter():
+	 	try:
+			# Check if safeeyes is in process arguments
+			if 'safeeyes' in proc.cmdline()[1]:
+				return True
+
+		# Ignore if process does not exist or does not have command line args
+		except (IndexError, psutil.NoSuchProcess):
+			pass
+	return False
+
+
 def main():
 	initialize_config()
 
@@ -261,28 +278,33 @@ def main():
 	logging.basicConfig(format='%(asctime)s [%(levelname)s]:[%(threadName)s] %(message)s', filename=log_file_path, filemode='w', level=logging.INFO)
 	logging.info("Starting Safe Eyes")
 
-	validate_config()
+	if not running():
+		validate_config()
 
-	global break_screen
+		global break_screen
-	global core
+		global core
-	global notification
+		global notification
-	global tray_icon
+		global tray_icon
-	global language
+		global language
-	
-	language_file_path = os.path.join(system_language_directory, str(config['language']) + '.json')
-	with open(language_file_path) as language_file:
-		language = json.load(language_file)
-	
-	tray_icon = TrayIcon(config, language, show_settings, show_about, enable_safeeyes, disable_safeeyes, on_quit)
-	break_screen = BreakScreen(on_skipped, break_screen_glade, style_sheet_path)
-	break_screen.initialize(config, language)
-	core = SafeEyesCore(show_notification, show_alert, close_alert, on_countdown, tray_icon.next_break_time)
-	core.initialize(config, language)
-	core.start()
-	notification = Notification(language)
-	
-	handle_system_suspend()
 
-	Gtk.main()
+		language_file_path = os.path.join(system_language_directory, str(config['language']) + '.json')
+		with open(language_file_path) as language_file:
+			language = json.load(language_file)
 
-main()
+		tray_icon = TrayIcon(config, language, show_settings, show_about, enable_safeeyes, disable_safeeyes, on_quit)
+		break_screen = BreakScreen(on_skipped, break_screen_glade, style_sheet_path)
+		break_screen.initialize(config, language)
+		core = SafeEyesCore(show_notification, show_alert, close_alert, on_countdown, tray_icon.next_break_time)
+		core.initialize(config, language)
+		core.start()
+		notification = Notification(language)
+
+		handle_system_suspend()
+
+		Gtk.main()
+	else:
+		logging.info('SafeEyes is already running')
+		sys.exit(0)
+
+if __name__ == '__main__':
+	main()