reimplement tendo to prevent console flashes

README.md

@@ -26,6 +26,7 @@ Audio files from [MixKit](https://mixkit.co/)
 ### Changelog
 ### 0.7.1
 - Fix win32api dependency, changed to ctypes windll
+- Remove window flashes
 
 ### 0.7.0
 - Add Threading controls to config

modules/single_instance.py

@@ -1,10 +1,48 @@
 
 import os
-from tendo.singleton import SingleInstance
+import sys
+import tempfile
 from PySide6.QtWidgets import QApplication, QMessageBox
 from PySide6.QtGui import QIcon
 from modules.sound import playError
 
+class SingleInstanceException(BaseException):
+    pass
+
+class SingleInstance(object):
+    def __init__(self, flavor_id="", lockfile=""):
+        self.initialized = False
+        if lockfile:
+            self.lockfile = lockfile
+        else:
+            basename = os.path.splitext(os.path.abspath(sys.argv[0]))[0].replace(
+                "/", "-").replace(":", "").replace("\\", "-") + '-%s' % flavor_id + '.lock'
+            self.lockfile = os.path.normpath(
+                tempfile.gettempdir() + '/' + basename)    
+            try:
+                if os.path.exists(self.lockfile):
+                    os.unlink(self.lockfile)
+                self.fd = os.open(
+                    self.lockfile, os.O_CREAT | os.O_EXCL | os.O_RDWR)
+            except OSError:
+                type, e, tb = sys.exc_info()
+                if e.errno == 13:
+                    raise SingleInstanceException()
+                print(e.errno)
+                raise
+        self.initialized = True
+
+    def __del__(self):
+        if not self.initialized:
+            return
+        try:
+            if hasattr(self, 'fd'):
+                os.close(self.fd)
+                os.unlink(self.lockfile)
+        except Exception as e:
+            print("Unloggable error: %s" % e)
+            sys.exit(-1)
+
 
 try:
     me = SingleInstance()

requirements.txt

@@ -0,0 +1,10 @@
+pytesseract
+opencv-python
+PySide6
+google-cloud-firestore
+simpleaudio
+watchdog
+python-slugify
+thefuzz[speedup]
+lxml
+pycaw