Added aoc new command to save on boilerplate

aoc.py

@@ -39,4 +39,59 @@ def output(part : int, func, post=None, comment=None, args=[], kwargs={}):
     else:
         print(f"   {result}")
 
-    print()
+    print()
+
+def __find_next_day():
+    days = map(
+        lambda fn: int(os.path.basename(fn).replace("day","").replace(".py","")),
+        filter(
+            lambda fn: fn.startswith("day"), 
+            os.listdir(os.path.dirname(__file__))
+        )
+    )
+    return max(days) + 1
+
+
+if __name__ == "__main__":
+    import argparse
+    parser = argparse.ArgumentParser()
+    subparser = parser.add_subparsers(dest="command")
+
+    parser_new = subparser.add_parser("new", help="Create a file for a new day")
+    parser_new.add_argument("day", type=int, nargs="?", default=__find_next_day(), help="Day to create (defaults to next day that doesn't exist)")
+
+    args = parser.parse_args()
+    if args.command == "new":
+        filename = os.path.join(os.path.dirname(__file__), f"day{args.day:02}.py")
+        if os.path.exists(filename):
+            print(f"day{args.day:02}.py exists, overwrite? (y/N)")
+            if input().lower() != "y":
+                exit()
+        with open(filename, 'w') as fd:
+            fd.write(
+"""import aoc
+
+def main():
+    aoc.header("Your title here")
+    test()
+
+    aoc.output(1, part1)
+    aoc.output(2, part2)
+
+def test():
+    pass
+    print("✓ All tests passed!")
+
+def part1():
+    pass
+
+def part2():
+    pass
+
+if __name__ == "__main__":
+    main()
+""")
+            print(f"Created day{args.day:02}.py")
+
+
+