Infinisil’s Advent Of Code 2018 Solutions

See https://adventofcode.com/2018/

All commands by default use my personal input file. You can specify a different file by giving it as an argument.

Building and running

The default nix build will include binaries for every day:

$ nix-build
/nix/store/fcckhqa9mqyh7q3sl4vpii3b8gjl56gg-aoc
$ result/bin/aoc1
2553
78724
$ result/bin/aoc2
24980
qysdtrkloagnfozuwujmhrbvx

Builds for specific days are also possible:

$ nix-build -A aoc2
/nix/store/hd6x5vszsa82b210rj8fx6kshr7zv6wa-aoc2-0.1.0.0
$ result/bin/aoc2
24980
qysdtrkloagnfozuwujmhrbvx

Developing

By entering a nix-shell in the project root you can build all packages with cabal new-build:

$ nix-shell
[nix-shell:~/aoc]$ cabal new-build aoc1
Up to date
[nix-shell:~/aoc]$ cabal new-run aoc2
Up to date
4980
qysdtrkloagnfozuwujmhrbvx

It’s also possible to use cabal build:

[nix-shell:~/aoc]$ cd aoc1
[nix-shell:~/aoc/aoc1]$ cabal configure --datadir . --datasubdir .
Resolving dependencies...
Configuring aoc1-0.1.0.0...
[nix-shell:~/aoc/aoc1]$ cabal run
Preprocessing executable 'aoc1' for aoc1-0.1.0.0..
Building executable 'aoc1' for aoc1-0.1.0.0..
Running aoc1...
553
78724

Template creation

A simple template for the next day can be created by running

$ ./newday 7
Created new template in aoc7