Nixified the repo

default.nix

@@ -0,0 +1,22 @@
+{ nixpkgs ? import <nixpkgs> {}, compiler ? "default"}:
+let
+  inherit (nixpkgs) pkgs;
+  haskellPackages = if compiler == "default"
+                       then pkgs.haskellPackages
+                       else pkgs.haskell.packages.${compiler};
+  mcwhirter-io = haskellPackages.callPackage ./mcwhirter-io.nix {};
+in
+nixpkgs.stdenv.mkDerivation {
+  name = "mcwhirter-io-website";
+  buildInputs = [ mcwhirter-io ];
+  src = ./.;
+  buildPhase = ''
+    echo "Setting LC_ALL to C.UTF-8 to avoid invalid byte sequence."
+    export LC_ALL=C.UTF-8
+    site build
+  '';
+  installPhase = ''
+    mkdir $out
+    cp -R _site/* $out
+  '';
+}

mcwhirter-io.cabal

@@ -6,6 +6,7 @@ cabal-version:      >= 1.10
 executable site
   main-is:          site.hs
   build-depends:    base == 4.*
-                  , hakyll == 4.12.*
+                  , hakyll == 4.13.*
+                  , pandoc
   ghc-options:      -threaded
   default-language: Haskell2010

mcwhirter-io.nix

@@ -0,0 +1,11 @@
+{ mkDerivation, base, hakyll, stdenv }:
+mkDerivation {
+  pname = "mcwhirter-io";
+  version = "0.1.0.0";
+  src = ./.;
+  isLibrary = false;
+  isExecutable = true;
+  executableHaskellDepends = [ base hakyll ];
+  license = "unknown";
+  hydraPlatforms = stdenv.lib.platforms.none;
+}

nix/sources.json

@@ -0,0 +1,26 @@
+{
+    "niv": {
+        "branch": "master",
+        "description": "Easy dependency management for Nix projects",
+        "homepage": "https://github.com/nmattia/niv",
+        "owner": "nmattia",
+        "repo": "niv",
+        "rev": "dd13098d01eaa6be68237e7e38f96782b0480755",
+        "sha256": "1cfjdbsn0219fjzam1k7nqzkz8fb1ypab50rhyj026qbklqq2kvq",
+        "type": "tarball",
+        "url": "https://github.com/nmattia/niv/archive/dd13098d01eaa6be68237e7e38f96782b0480755.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
+    "nixpkgs": {
+        "branch": "nixpkgs-unstable",
+        "description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
+        "homepage": "https://github.com/NixOS/nixpkgs",
+        "owner": "NixOS",
+        "repo": "nixpkgs-channels",
+        "rev": "10100a97c8964e82b30f180fda41ade8e6f69e41",
+        "sha256": "011f36kr3c1ria7rag7px26bh73d1b0xpqadd149bysf4hg17rln",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs-channels/archive/10100a97c8964e82b30f180fda41ade8e6f69e41.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    }
+}

nix/sources.nix

@@ -0,0 +1,134 @@
+# This file has been generated by Niv.
+
+let
+
+  #
+  # The fetchers. fetch_<type> fetches specs of type <type>.
+  #
+
+  fetch_file = pkgs: spec:
+    if spec.builtin or true then
+      builtins_fetchurl { inherit (spec) url sha256; }
+    else
+      pkgs.fetchurl { inherit (spec) url sha256; };
+
+  fetch_tarball = pkgs: spec:
+    if spec.builtin or true then
+      builtins_fetchTarball { inherit (spec) url sha256; }
+    else
+      pkgs.fetchzip { inherit (spec) url sha256; };
+
+  fetch_git = spec:
+    builtins.fetchGit { url = spec.repo; inherit (spec) rev ref; };
+
+  fetch_builtin-tarball = spec:
+    builtins.trace
+      ''
+        WARNING:
+          The niv type "builtin-tarball" will soon be deprecated. You should
+          instead use `builtin = true`.
+
+          $ niv modify <package> -a type=tarball -a builtin=true
+      ''
+      builtins_fetchTarball { inherit (spec) url sha256; };
+
+  fetch_builtin-url = spec:
+    builtins.trace
+      ''
+        WARNING:
+          The niv type "builtin-url" will soon be deprecated. You should
+          instead use `builtin = true`.
+
+          $ niv modify <package> -a type=file -a builtin=true
+      ''
+      (builtins_fetchurl { inherit (spec) url sha256; });
+
+  #
+  # Various helpers
+  #
+
+  # The set of packages used when specs are fetched using non-builtins.
+  mkPkgs = sources:
+    let
+      sourcesNixpkgs =
+        import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) {};
+      hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
+      hasThisAsNixpkgsPath = <nixpkgs> == ./.;
+    in
+      if builtins.hasAttr "nixpkgs" sources
+      then sourcesNixpkgs
+      else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
+        import <nixpkgs> {}
+      else
+        abort
+          ''
+            Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
+            add a package called "nixpkgs" to your sources.json.
+          '';
+
+  # The actual fetching function.
+  fetch = pkgs: name: spec:
+
+    if ! builtins.hasAttr "type" spec then
+      abort "ERROR: niv spec ${name} does not have a 'type' attribute"
+    else if spec.type == "file" then fetch_file pkgs spec
+    else if spec.type == "tarball" then fetch_tarball pkgs spec
+    else if spec.type == "git" then fetch_git spec
+    else if spec.type == "builtin-tarball" then fetch_builtin-tarball spec
+    else if spec.type == "builtin-url" then fetch_builtin-url spec
+    else
+      abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
+
+  # Ports of functions for older nix versions
+
+  # a Nix version of mapAttrs if the built-in doesn't exist
+  mapAttrs = builtins.mapAttrs or (
+    f: set: with builtins;
+    listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
+  );
+
+  # fetchTarball version that is compatible between all the versions of Nix
+  builtins_fetchTarball = { url, sha256 }@attrs:
+    let
+      inherit (builtins) lessThan nixVersion fetchTarball;
+    in
+      if lessThan nixVersion "1.12" then
+        fetchTarball { inherit url; }
+      else
+        fetchTarball attrs;
+
+  # fetchurl version that is compatible between all the versions of Nix
+  builtins_fetchurl = { url, sha256 }@attrs:
+    let
+      inherit (builtins) lessThan nixVersion fetchurl;
+    in
+      if lessThan nixVersion "1.12" then
+        fetchurl { inherit url; }
+      else
+        fetchurl attrs;
+
+  # Create the final "sources" from the config
+  mkSources = config:
+    mapAttrs (
+      name: spec:
+        if builtins.hasAttr "outPath" spec
+        then abort
+          "The values in sources.json should not have an 'outPath' attribute"
+        else
+          spec // { outPath = fetch config.pkgs name spec; }
+    ) config.sources;
+
+  # The "config" used by the fetchers
+  mkConfig =
+    { sourcesFile ? ./sources.json
+    , sources ? builtins.fromJSON (builtins.readFile sourcesFile)
+    , pkgs ? mkPkgs sources
+    }: rec {
+      # The sources, i.e. the attribute set of spec name to spec
+      inherit sources;
+
+      # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
+      inherit pkgs;
+    };
+in
+mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }

release.nix

@@ -0,0 +1,45 @@
+let
+  sources = import ./nix/sources.nix;
+in
+{ compiler ? "ghc883"
+, pkgs ? import sources.nixpkgs { }
+}:
+
+let
+  inherit (pkgs.lib.trivial) flip pipe;
+  inherit (pkgs.haskell.lib) appendPatch appendConfigureFlags;
+
+  haskellPackages = pkgs.haskell.packages.${compiler}.override {
+    overrides = hpNew: hpOld: {
+      hakyll =
+        pipe
+           hpOld.hakyll
+           [ (flip appendPatch ./hakyll.patch)
+             (flip appendConfigureFlags [ "-f" "watchServer" "-f" "previewServer" ])
+           ];
+
+      mcwhirter-io = hpNew.callCabal2nix "mcwhirter-io" ./. { };
+
+      niv = import sources.niv { };
+    };
+  };
+
+  project = haskellPackages.mcwhirter-io;
+in
+{
+  project = project;
+
+  shell = haskellPackages.shellFor {
+    packages = p: with p; [
+      project
+    ];
+    buildInputs = with haskellPackages; [
+      ghcid
+      hlint       # or ormolu
+      niv
+      pkgs.cacert # needed for niv
+      pkgs.nix    # needed for niv
+    ];
+    withHoogle = true;
+  };
+}

shell.nix

@@ -0,0 +1 @@
+(import ./release.nix { }).shell