feat(main.py): move check_license_agreement function to a separate module for better organization and reusability

feat(utils/license.py): create a new module to handle license agreement checking and display

utils/license.py

@@ -0,0 +1,53 @@
+import hashlib
+import os
+
+from utils.settings import settings
+from utils.misc import printm
+from pydoc import pager
+from sys import platform
+
+async def check_license_agreement():
+    h = hashlib.sha256()
+    with open('LICENSE', 'rb') as file:
+        chunk = file.read(1024)
+        while chunk:
+            h.update(chunk)
+            chunk = file.read(1024)
+    license_hash = h.hexdigest()
+    if settings.license_agreement_accepted == False or settings.license_agreement_accepted == None:
+        printm("You have to accept the license agreement before using this program.")
+    elif settings.license_agreement_accepted == True:
+        if settings.license_agreement_hash != license_hash:
+            printm("The license agreement has been updated since you last accepted it. Please accept it again.")
+        else:
+            return True
+    else:
+        printm("There was an error with the license agreement. Please accept it again.")
+    while True:
+        printm('\n\n')
+        inp = input("Type p to print the license agreement, a to accept it, q to quit the program or o to open the LICENSE in your default text editor: ")
+        if inp == "p":
+            input('You can use the "Enter" key to scroll down and the "q" key to quit the license agreement. Press "Enter" to continue.')
+            with open('LICENSE', 'r', encoding='utf-8') as f:
+                pager(f.read())
+        elif inp == "a":
+            settings.set_setting('license_agreement_accepted', True)
+            settings.set_setting('license_agreement_hash', license_hash)
+            if os.path.exists('LICENSE.txt'):
+                os.remove('LICENSE.txt')
+            printm("License agreement accepted.")
+            return True
+        elif inp == "q":
+            printm("Quitting the program...")
+            raise KeyboardInterrupt
+        elif inp == "o":
+            dict_os_commands = {
+                "linux": "xdg-open",
+                "win32": "start",
+                "darwin": "open"
+            }
+            #copy the license file to a temporary txt file
+            with open('LICENSE', 'r', encoding='utf-8') as f:
+                with open('LICENSE.txt', 'w', encoding='utf-8') as f2:
+                    f2.write(f.read())
+            os.system(f"{dict_os_commands[platform]} LICENSE.txt")