emacs.nix

{ config, pkgs, lib, ... }:

with builtins;
let
  buildEnv = { buildInputs = [pkgs.emacs25-nox]; };

  buildPath = (pkgs.runCommand "init" buildEnv ''
    mkdir -p $out;
    ln -s "${./init.org}" ./init.org;
    emacs -Q --script "${assets/org-build.el}" -f make-init-el;
    cp init.el $out/init.el;
  '').outPath;

  docsEnv = { buildInputs = [pkgs.emacs25-nox]; };

  docsPath = (pkgs.runCommand "docs" docsEnv ''
    mkdir -p $out;
    ln -s "${buildPath}/init.el" ./init.el;
    ln -s "${./init.org}" ./init.org;
    emacs -Q -l init.el --script "${assets/org-export.el}" -f generate-doc-files;
    ls -la;
  '').outPath;

in {

  programs.emacs = {
    enable = true;
    package = pkgs.emacs;
    extraPackages = epkgs: [
      epkgs.badger-theme
    ];
  };

  home.file.".emacs.d/init.el".source = "${buildPath}/init.el";
  home.file.".emacs.d/blah".text = "blah";
}

output

switch
these derivations will be built:
  /nix/store/b3798x2zrg3b1brlv6pqk5axlw4zz2dd-init.drv
  /nix/store/jxnxkx62f0p4x0r6jqzq72k8j1mlpap9-home-manager-files.drv
  /nix/store/vnji95skg4kf0v25w7m23c9mrg5slaa6-home-manager-generation.drv
building path(s) ‘/nix/store/ylkv3a8f63jrpdv4fp7zd5s7qvbn8hrk-init’
Building init.org to /private/tmp/nix-build-init.drv-0/.emacs-init-build/init.el.9186 ...
Tangled 8 code blocks from init.org
OK, time to update all .el files.
Create /private/tmp/nix-build-init.drv-0/init.el from init.org...
building path(s) ‘/nix/store/ahca79nj76rvpqyvymyk0vr0gcb66f88-home-manager-files’
installing
building path(s) ‘/nix/store/l3zrvj12gp0wypmwxqawc06156w4z57b-home-manager-generation’
installing
Starting home manager activation
Activating checkLinkTargets
Activating writeBoundary
Activating installPackages
replacing old ‘home-manager-path’
installing ‘home-manager-path’
Activating linkGeneration
Creating profile generation 30
Cleaning up orphan links from /Users/dustinlacewell