Upload my 2019 Advent of Code attempts

Well, unexpectedly (perhaps naively so), I only made it to Day 7. I created
these before I stumbled upon the idea of the mono-repository; otherwise, I like
to think I would have more granular commits introducing this work.

advent-of-code/writePythonBin.nix

@@ -0,0 +1,18 @@
+{ pkgs ? import <nixpkgs> {}, ... }:
+
+{ name, deps, src }:
+
+let
+  inherit (pkgs) pythonPackages writeTextFile;
+  inherit (builtins) toFile;
+
+in writeTextFile {
+  inherit name;
+  executable = true;
+  destination = "/bin/${name}";
+
+  text = ''
+    #!/bin/sh
+    ${pkgs.python3}/bin/python3 ${src}
+  '';
+}