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make_new_day.py

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+import pathlib as pl
+import subprocess as sp
+
+
+def main():
+    most_recent_day = get_most_recent_day()
+    sp.call(shell=True, args=f"cp -r day{most_recent_day:02} day{most_recent_day + 1:02}")
+    sp.call(shell=True, args=f"rm day{most_recent_day + 1:02}/part2.py")
+    sp.call(shell=True, args=f"cd day{most_recent_day + 1:02}/ && make d")
+
+
+def get_most_recent_day() -> int:
+    most_recent = None
+    for item in pl.Path().iterdir():
+        if item.is_dir() and not item.name.startswith('.') and not item.name.startswith('_'):
+            day_num_str = item.name.split("day")[-1]
+            if day_num_str.startswith('0'):
+                day_num_str = day_num_str[-1]
+            day_num = int(day_num_str)
+            if most_recent is None or day_num > most_recent:
+                most_recent = day_num
+    if most_recent is None:
+        raise Exception
+    return most_recent
+
+
+if __name__ == "__main__":
+    main()