some reformatiing, uv setup, removed i3 special case

timer.py

@@ -3,11 +3,10 @@ import datetime
 from tkinter import Tk, CENTER, Label
 import click
 import typing as t
-import os
 
-DELTASECONDS = "+%Ss"
-DELTAMINUTES = "+%Mm"
-DELTAHOURS = "+%Hh"
+DELTA_SECONDS = "+%Ss"
+DELTA_MINUTES = "+%Mm"
+DELTA_HOURS = "+%Hh"
 HOURS = "%H:%M"
 DATETIME_FORMAT = [
     "%Y-%m-%d",
@@ -15,9 +14,9 @@ DATETIME_FORMAT = [
     "%Y-%m-%d %H:%M:%S",
     "%Y-%m-%d %H:%M",
     HOURS,
-    DELTAHOURS,
-    DELTAMINUTES,
-    DELTASECONDS,
+    DELTA_HOURS,
+    DELTA_MINUTES,
+    DELTA_SECONDS,
 ]
 
 
@@ -25,15 +24,15 @@ class DateTime(click.DateTime):
     def _try_to_convert_date(self, value: t.Any, format: str) -> t.Optional[datetime]:
         try:
             if value[0] == "+":
-                if format == DELTASECONDS and value[-1] == "s":
+                if format == DELTA_SECONDS and value[-1] == "s":
                     return datetime.datetime.now() + datetime.timedelta(
                         seconds=int(value[1:-1])
                     )
-                if format == DELTAMINUTES and value[-1] == "m":
+                if format == DELTA_MINUTES and value[-1] == "m":
                     return datetime.datetime.now() + datetime.timedelta(
                         minutes=int(value[1:-1])
                     )
-                if format == DELTAHOURS and value[-1] == "h":
+                if format == DELTA_HOURS and value[-1] == "h":
                     return datetime.datetime.now() + datetime.timedelta(
                         hours=int(value[1:-1])
                     )
@@ -47,15 +46,15 @@ class DateTime(click.DateTime):
             return None
 
 
-def start_app(enddate):
+def start_app(end_date):
     root = Tk()
     root.geometry("300x100+200+200")
     root.configure(background="#000")
-    tlbl = Label(root, text="", font=("Arial", -100), fg="#fff", bg="#000")
-    tlbl.pack()
-    tlbl.place(relx=0.5, rely=0.5, anchor=CENTER)
+    timer_label = Label(root, text="", font=("Arial", -100), fg="#fff", bg="#000")
+    timer_label.pack()
+    timer_label.place(relx=0.5, rely=0.5, anchor=CENTER)
 
-    def deltaStr(t):
+    def format_delta(t):
         days, remainder = divmod(t.total_seconds(), 60 * 60 * 24)
         hours, remainder = divmod(remainder, 3600)
         minutes, seconds = divmod(remainder, 60)
@@ -69,29 +68,27 @@ def start_app(enddate):
 
     def resize(_):
         ratio = root.winfo_width() / 1920
-        tlbl.configure(font=("Chicago", int(ratio * -200)))
+        timer_label.configure(font=("Chicago", int(ratio * -200)))
 
     def update():
-        delta = enddate - datetime.datetime.now()
+        delta = end_date - datetime.datetime.now()
         if delta.total_seconds() < 0:
-            tlbl.configure(text="Now")
-            tlbl.config(fg="red")
+            timer_label.configure(text="Now")
+            timer_label.config(fg="red")
         else:
-            tlbl.configure(text=deltaStr(delta))
+            timer_label.configure(text=format_delta(delta))
         root.after(1000 - datetime.datetime.now().microsecond // 1000, update)
 
     root.bind("<Configure>", resize)
     root.bind("<Escape>", lambda x: root.destroy())
     root.after(1, update)
-    if os.environ.get("XDG_CURRENT_DESKTOP", "") == "i3":
-        root.wm_attributes("-type", "splash")
     root.mainloop()
 
 
 @click.command()
-@click.argument("enddate", type=DateTime(formats=DATETIME_FORMAT))
-def main(enddate):
-    start_app(enddate)
+@click.argument("end_date", type=DateTime(formats=DATETIME_FORMAT))
+def main(end_date):
+    start_app(end_date)
 
 
 if __name__ == "__main__":