1 files changed, 28 insertions, 0 deletions
diff --git a/commons.py b/commons.py
new file mode 100644
index 0000000..2bc58c2
--- /dev/null
+++ b/commons.py
@@ -0,0 +1,28 @@
+from pathlib import Path
+
+import requests
+
+root: Path = Path(__file__).parent
+cache: Path = root / 'cache'
+cache.mkdir(parents=True, exist_ok=True)
+session: str = (root / 'session.txt').read_text().strip()
+cookies = dict(session=session)
+
+
+def identity(x):
+    return x
+
+
+def remove_empty(seq):
+    return filter(identity, seq)
+
+
+def get_input(day: int) -> str:
+    cache_file = cache / str(day)
+    if cache_file.exists():
+        return cache_file.read_text()
+    text = requests.get('http://adventofcode.com/2018/day/{}/input'.format(day),
+                        cookies=cookies).text
+    cache_file.write_text(text)
+    return text
+