Add nix

.envrc

@@ -0,0 +1 @@
+use nix

.gitignore

@@ -20,3 +20,5 @@
 
 # reveal js (generated)
 /revealjs/*/index.html
+
+/result

default.nix

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+let
+  pkgs = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/24c9b05ac53e422f1af81a156f1fd58499eb27fb.tar.gz") {};
+
+  # reproducible source
+  gitignoreSrc = pkgs.fetchFromGitHub {
+    owner = "hercules-ci";
+    repo = "gitignore";
+    rev = "c4662e662462e7bf3c2a968483478a665d00e717";
+    sha256 = "sha256:1npnx0h6bd0d7ql93ka7azhj40zgjp815fw2r6smg8ch9p7mzdlx";
+  };
+  inherit (import gitignoreSrc { inherit (pkgs) lib; }) gitignoreSource;
+
+  python = (pkgs.python38.withPackages (ps: with ps; [
+    CommonMark
+    jinja2
+    pyyaml
+  ]));
+
+  texlive = pkgs.texlive.combine {
+    inherit (pkgs.texlive) scheme-medium
+      appendixnumberbeamer
+      beamertheme-focus
+      beamertheme-metropolis
+      biber
+      biblatex
+      datetime
+      enumitem
+      fmtcount
+      pgfopts;
+  };
+in
+pkgs.stdenv.mkDerivation {
+  name = "presis";
+
+  nativeBuildInputs = [
+    python
+    texlive
+  ];
+
+  src = gitignoreSource ./.;
+
+  FONTCONFIG_FILE = pkgs.makeFontsConf {
+    fontDirectories = with pkgs; [
+      fira
+      iosevka
+    ];
+  };
+
+  enableParallelBuilding = true;
+
+  dontFixup = true;
+
+  installPhase = ''
+    cp -r . $out;
+  '';
+}

shell.nix

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+import ./default.nix