Prep

makefile

 include .env
-FILE = $(shell find . -path "./y????/p??.py" -type f | xargs ls -rt | tail -n 1)
-DATA = $(shell echo $(FILE) | sed s/.py/.dat/)
-PYTHONPATH = .
 export
 
-main: venv/
-	@venv/bin/python -u toolkit.py $(FILE)
-	@cat $(DATA) | venv/bin/python -u $(FILE)
+PYTHONPATH := .
+FILE := $(shell find . -path "./y????/p??.py" -type f | xargs ls -rt | tail -n 1)
+YEAR := $(shell echo ${FILE} | sed 's/[^0-9]/ /g' | cut -d' ' -f4)
+DAY := $(shell echo ${FILE} | sed 's/[^0-9]/ /g' | cut -d' ' -f6 | bc)
+URL := https://adventofcode.com/${YEAR}/day/${DAY}/input
+DATA := $(shell echo ${FILE} | sed s/.py/.dat/)
 
-flake: venv/
-	venv/bin/flake8 --exclude=venv/
-
-venv/: requirements.txt
-	rm -rf venv/
-	~/.pyenv/versions/3.8.0/bin/python -m venv venv
-	venv/bin/pip install -r requirements.txt
-	touch requirements.txt venv/
-	# install flake8 git hook
-	# echo 'venv/bin/flake8 --exclude=venv/' > .git/hooks/pre-commit
-	# chmod +x .git/hooks/pre-commit
+main:
+	@test -f ${DATA} || curl -s -b "session=${SESSION}" ${URL} > ${DATA}
+	@cat $(DATA) | python3 -u $(FILE)

toolkit.py

 import sys
 from pathlib import Path
 
-import requests
-
 
 product = functools.partial(functools.reduce, operator.mul)
 
     return path[::-1]
 
 
-def ensure_data(path):
-    if not path.exists():
-        year, qn = map(int, re.findall(r'\d+', sys.argv[1]))
-        url = f'https://adventofcode.com/{year}/day/{qn}/input'
-        cookies = {'session': os.environ['SESSION']}
-        response = requests.get(url, cookies=cookies)
-        response.raise_for_status()
-        path.write_bytes(response.content)
-
-
 def batch(iterable, size):
     count = itertools.count()
     for _, sub in itertools.groupby(iterable, lambda _: next(count) // size):
             count += 1
         else:
             raise RuntimeError('Reached steady state')
-
-
-if __name__ == '__main__':
-    data_file = Path(sys.argv[1]).with_suffix('.dat')
-    ensure_data(data_file)

y2015/p01.py

 ans1 = 0
 ans2 = None
-for i, char in enumerate(data_file.read_text(), 1):
+for i, char in enumerate(open(0).read(), 1):
     ans1 += {'(': 1, ')': -1}[char]
     if ans1 == -1 and ans2 is None:
         ans2 = i
+print(ans1)
+print(ans2)