README.md

   1 ---
   2 title: "Advent of Code 2019"
   3 output: html_document
   4 css: modest.css
   5 ---
   6 Code to solve the [Advent of Code](http://adventofcode.com/2019/) puzzles. This year, I'm using the puzzles to develop my skills in [Haskell](https://wiki.haskell.org/Haskell). I'm writing up a [commentary on these puzzles and my solutions](https://work.njae.me.uk/tag/advent-of-code/) on my blog.
   7
   8 [Learn you a Haskell](http://learnyouahaskell.com/chapters), [Introduction to Haskell 98](https://www.haskell.org/tutorial/index.html), and [Hackage](https://hackage.haskell.org/) are good resources.
   9
  10 The [Stack documentation](https://docs.haskellstack.org/en/stable/README/) and [How I Start: Haskell](http://howistart.org/posts/haskell/1/) are good sources of using the tools.
  11
  12 # Toolchain
  13
  14 I'm using the basic Haskell Platform installation, together with `stack` to manage the packages and dependencies (install with
  15 ```
  16 $ sudo aptitude install haskell-platform haskell-stack
  17 ```
  18 ), then updgrade with
  19 ```
  20  stack upgrade --binary-only
  21 ```
  22 as the version in the Ubuntu repos is too old to work with current Haskell Stack package sets.
  23
  24 ## Creating the repository and project
  25 Create the repository as normal: create the project in Gitolite, clone it, and insert the `.gitignore` and `README.md` files.
  26
  27 There's one package per day, with the code for each package in sub-directories of the root directory.
  28
  29 Create the basic `stack` project. This will create a new directory. Note that this new directory name can't have a hyphen-delimited word that's just digits, so the project will have to be `advent-of-code`
  30
  31 ```
  32 stack new advent-of-code --bare simple
  33 ```
  34
  35 Modify the `stack.yaml` file as needed, such as adding the `ghc-options` stanza.
  36
  37 ## Creating subsequent days
  38
  39 Each day lives in a separate directory, with its own `package.yaml` file and code in the `src` directory. (I based this configuration from [mstksg's setup](https://github.com/mstksg/advent-of-code-2018).)
  40
  41 Compile with
  42 ```
  43 stack build
  44 ```
  45 or
  46 ```
  47 stack build advent01
  48 ```
  49
  50 Run with
  51 ```
  52 stack exec advent01
  53 ```
  54
  55 If you want to pass in additional RTS parameters, do it like this:
  56 ```
  57 stack exec -- advent01 +RTS -K0 -RTS
  58 ```
  59
  60 Run interactively with
  61 ```
  62 stack ghci advent01
  63 ```
  64 or
  65 ```
  66 stack ghci advent01:exe:advent01
  67 ```
  68 if the first form is ambiguous.
  69
  70 To profile, use
  71 ```
  72 stack build --executable-profiling --library-profiling --ghc-options="-fprof-auto -rtsopts" advent01
  73 ```
  74 then run with
  75 ```
  76 stack exec --profile -- advent01 +RTS -p -hy
  77 ```
  78 Generate the profile graph with
  79 ```
  80 stack exec hp2ps advent01.hp
  81 ```
  82
  83 # Packages
  84
  85 Stack is using the [14.16-lts resolver](https://www.stackage.org/lts-14.16) for packages, so make sure you read the [correct documentation for the packages included in it](https://www.stackage.org/lts-14.16/docs).
  86
  87 When you use a new package, use
  88
  89 ```
  90 stack solver
  91 ```
  92 to see how the `stack.yaml` file needs to change, and
  93 ```
  94 stack solver --update-yaml
  95 ```
  96 to implement the changes.
  97
  98 # Readme
  99
 100 Build this readme file wth
 101 ```
 102 pandoc -s README.md > README.html
 103 ```
 104
 105 (Using the [Modest style](https://github.com/markdowncss/modest).)