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).
   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
  25 ## Creating the repository and project
  26 Create the repository as normal: create the project in Gitolite, clone it, and insert the `.gitignore` and `README.md` files.
  27
  28 There's just one package, with the code in sub-directories of the `src` directory. Each day will generate one (or more) entries in the `adventofcode17.cabal` file.
  29
  30 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`
  31
  32 ```
  33 stack new advent-of-code --bare simple
  34 ```
  35
  36 Modify the `stack.yaml` file as needed, such as adding the `ghc-options` stanza.
  37
  38 ## Creating subsequent days
  39
  40 Each day lives in a separate directory within the `src` directory. It will also need it's own stanza in `advent-of-code.cabal`.
  41
  42 Compile with
  43 ```
  44 stack build
  45 ```
  46 or
  47 ```
  48 stack build advent01
  49 ```
  50
  51 Run with
  52 ```
  53 stack exec advent01
  54 ```
  55
  56 If you want to pass in additional RTS parameters, do it like this:
  57 ```
  58 stack exec -- advent01 +RTS -K0 -RTS
  59 ```
  60
  61 Run interactively with
  62 ```
  63 stack ghci advent01
  64 ```
  65
  66 To profile, use
  67 ```
  68 stack build --executable-profiling --library-profiling --ghc-options="-fprof-auto -rtsopts"
  69 ```
  70 then run with
  71 ```
  72 stack exec -- advent01 +RTS -p -hy
  73 ```
  74 Generate the profile graph with
  75 ```
  76 stack exec hp2ps advent01.hp
  77 ```
  78
  79 # Packages
  80
  81 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).
  82
  83 When you use a new package, use
  84
  85 ```
  86 stack solver
  87 ```
  88 to see how the `stack.yaml` file needs to change, and
  89 ```
  90 stack solver --update-yaml
  91 ```
  92 to implement the changes.
  93
  94 # IHaskell
  95
  96 Install following the [IHaskell instructions](https://github.com/gibiansky/IHaskell).
  97
  98 Run it with
  99
 100 ```
 101 stack exec jupyter -- notebook
 102 ```
 103
 104 # Readme
 105
 106 Build this readme file wth
 107 ```
 108 pandoc -s README.md > README.html
 109 ```
 110
 111 (Using the [Modest style](https://github.com/markdowncss/modest).)