Use Ruff and fix all its warnings and errors

discord_reminder_bot/countdown.py

@@ -1,7 +1,4 @@
-"""
-calculate(job) - Calculates how many days, hours and minutes till trigger.
-"""
-import datetime
+from datetime import datetime, timedelta
 
 import pytz
 from apscheduler.job import Job
@@ -11,8 +8,7 @@ from discord_reminder_bot.settings import config_timezone
 
 
 def calculate(job: Job) -> str:
-    """Get trigger time from a reminder and calculate how many days,
-    hours and minutes till trigger.
+    """Get trigger time from a reminder and calculate how many days, hours and minutes till trigger.
 
     Days/Minutes will not be included if 0.
 
@@ -25,10 +21,7 @@ def calculate(job: Job) -> str:
     # TODO: This "breaks" when only seconds are left.
     # If we use (in {calc_countdown(job)}) it will show (in )
 
-    if type(job.trigger) is DateTrigger:
-        trigger_time = job.trigger.run_date
-    else:
-        trigger_time = job.next_run_time
+    trigger_time: datetime | None = job.trigger.run_date if type(job.trigger) is DateTrigger else job.next_run_time
 
     # Get_job() returns None when it can't find a job with that ID.
     if trigger_time is None:
@@ -41,8 +34,7 @@ def calculate(job: Job) -> str:
 
 
 def countdown(trigger_time: datetime) -> str:
-    """
-    Calculate days, hours and minutes to a date.
+    """Calculate days, hours and minutes to a date.
 
     Args:
         trigger_time: The date.
@@ -50,7 +42,7 @@ def countdown(trigger_time: datetime) -> str:
     Returns:
         A string with the days, hours and minutes.
     """
-    countdown_time = trigger_time - datetime.datetime.now(tz=pytz.timezone(config_timezone))
+    countdown_time: timedelta = trigger_time - datetime.now(tz=pytz.timezone(config_timezone))
 
     days, hours, minutes = (
         countdown_time.days,
@@ -60,7 +52,7 @@ def countdown(trigger_time: datetime) -> str:
 
     # Return seconds if only seconds are left.
     if days == 0 and hours == 0 and minutes == 0:
-        seconds = countdown_time.seconds % 60
+        seconds: int = countdown_time.seconds % 60
         return f"{seconds} second" + ("s" if seconds != 1 else "")
 
     # TODO: Explain this.